// Algorithm implementation -*- C++ -*-
-// Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
-// Free Software Foundation; either version 2, or (at your option)
+// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
-// You should have received a copy of the GNU General Public License along
-// with this library; see the file COPYING. If not, write to the Free
-// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-// USA.
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
-// As a special exception, you may use this file as part of a free software
-// library without restriction. Specifically, if other files instantiate
-// templates or use macros or inline functions from this file, or you compile
-// this file and link it with other files to produce an executable, this
-// file does not by itself cause the resulting executable to be covered by
-// the GNU General Public License. This exception does not however
-// invalidate any other reasons why the executable file might be covered by
-// the GNU General Public License.
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
/*
*
* You should not attempt to use it directly.
*/
-#ifndef _ALGO_H
-#define _ALGO_H 1
+#ifndef _STL_ALGO_H
+#define _STL_ALGO_H 1
+#include <cstdlib> // for rand
+#include <bits/algorithmfwd.h>
#include <bits/stl_heap.h>
-#include <bits/stl_tempbuf.h> // for _Temporary_buffer
-#include <debug/debug.h>
+#include <bits/stl_tempbuf.h> // for _Temporary_buffer
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+#include <random> // for std::uniform_int_distribution
+#endif
// See concept_check.h for the __glibcxx_*_requires macros.
-namespace std
-{
- /**
- * @brief Find the median of three values.
- * @param a A value.
- * @param b A value.
- * @param c A value.
- * @return One of @p a, @p b or @p c.
- *
- * If @c {l,m,n} is some convolution of @p {a,b,c} such that @c l<=m<=n
- * then the value returned will be @c m.
- * This is an SGI extension.
- * @ingroup SGIextensions
- */
- template<typename _Tp>
- inline const _Tp&
- __median(const _Tp& __a, const _Tp& __b, const _Tp& __c)
+_GLIBCXX_BEGIN_NAMESPACE(std)
+
+ /// Swaps the median value of *__a, *__b and *__c to *__a
+ template<typename _Iterator>
+ void
+ __move_median_first(_Iterator __a, _Iterator __b, _Iterator __c)
{
// concept requirements
- __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
- if (__a < __b)
- if (__b < __c)
- return __b;
- else if (__a < __c)
- return __c;
- else
- return __a;
- else if (__a < __c)
- return __a;
- else if (__b < __c)
- return __c;
+ __glibcxx_function_requires(_LessThanComparableConcept<
+ typename iterator_traits<_Iterator>::value_type>)
+
+ if (*__a < *__b)
+ {
+ if (*__b < *__c)
+ std::iter_swap(__a, __b);
+ else if (*__a < *__c)
+ std::iter_swap(__a, __c);
+ }
+ else if (*__a < *__c)
+ return;
+ else if (*__b < *__c)
+ std::iter_swap(__a, __c);
else
- return __b;
+ std::iter_swap(__a, __b);
}
- /**
- * @brief Find the median of three values using a predicate for comparison.
- * @param a A value.
- * @param b A value.
- * @param c A value.
- * @param comp A binary predicate.
- * @return One of @p a, @p b or @p c.
- *
- * If @c {l,m,n} is some convolution of @p {a,b,c} such that @p comp(l,m)
- * and @p comp(m,n) are both true then the value returned will be @c m.
- * This is an SGI extension.
- * @ingroup SGIextensions
- */
- template<typename _Tp, typename _Compare>
- inline const _Tp&
- __median(const _Tp& __a, const _Tp& __b, const _Tp& __c, _Compare __comp)
+ /// Swaps the median value of *__a, *__b and *__c under __comp to *__a
+ template<typename _Iterator, typename _Compare>
+ void
+ __move_median_first(_Iterator __a, _Iterator __b, _Iterator __c,
+ _Compare __comp)
{
// concept requirements
- __glibcxx_function_requires(_BinaryFunctionConcept<_Compare,bool,_Tp,_Tp>)
- if (__comp(__a, __b))
- if (__comp(__b, __c))
- return __b;
- else if (__comp(__a, __c))
- return __c;
- else
- return __a;
- else if (__comp(__a, __c))
- return __a;
- else if (__comp(__b, __c))
- return __c;
+ __glibcxx_function_requires(_BinaryFunctionConcept<_Compare, bool,
+ typename iterator_traits<_Iterator>::value_type,
+ typename iterator_traits<_Iterator>::value_type>)
+
+ if (__comp(*__a, *__b))
+ {
+ if (__comp(*__b, *__c))
+ std::iter_swap(__a, __b);
+ else if (__comp(*__a, *__c))
+ std::iter_swap(__a, __c);
+ }
+ else if (__comp(*__a, *__c))
+ return;
+ else if (__comp(*__b, *__c))
+ std::iter_swap(__a, __c);
else
- return __b;
+ std::iter_swap(__a, __b);
}
- /**
- * @brief Apply a function to every element of a sequence.
- * @param first An input iterator.
- * @param last An input iterator.
- * @param f A unary function object.
- * @return @p f.
- *
- * Applies the function object @p f to each element in the range
- * @p [first,last). @p f must not modify the order of the sequence.
- * If @p f has a return value it is ignored.
- */
- template<typename _InputIterator, typename _Function>
- _Function
- for_each(_InputIterator __first, _InputIterator __last, _Function __f)
- {
- // concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_requires_valid_range(__first, __last);
- for ( ; __first != __last; ++__first)
- __f(*__first);
- return __f;
- }
+ // for_each
- /**
- * @if maint
- * This is an overload used by find() for the Input Iterator case.
- * @endif
- */
+ /// This is an overload used by find() for the Input Iterator case.
template<typename _InputIterator, typename _Tp>
inline _InputIterator
- find(_InputIterator __first, _InputIterator __last,
- const _Tp& __val,
- input_iterator_tag)
+ __find(_InputIterator __first, _InputIterator __last,
+ const _Tp& __val, input_iterator_tag)
{
while (__first != __last && !(*__first == __val))
++__first;
return __first;
}
- /**
- * @if maint
- * This is an overload used by find_if() for the Input Iterator case.
- * @endif
- */
+ /// This is an overload used by find_if() for the Input Iterator case.
template<typename _InputIterator, typename _Predicate>
inline _InputIterator
- find_if(_InputIterator __first, _InputIterator __last,
- _Predicate __pred,
- input_iterator_tag)
+ __find_if(_InputIterator __first, _InputIterator __last,
+ _Predicate __pred, input_iterator_tag)
{
- while (__first != __last && !__pred(*__first))
+ while (__first != __last && !bool(__pred(*__first)))
++__first;
return __first;
}
- /**
- * @if maint
- * This is an overload used by find() for the RAI case.
- * @endif
- */
+ /// This is an overload used by find() for the RAI case.
template<typename _RandomAccessIterator, typename _Tp>
_RandomAccessIterator
- find(_RandomAccessIterator __first, _RandomAccessIterator __last,
- const _Tp& __val,
- random_access_iterator_tag)
+ __find(_RandomAccessIterator __first, _RandomAccessIterator __last,
+ const _Tp& __val, random_access_iterator_tag)
{
- typename iterator_traits<_RandomAccessIterator>::difference_type __trip_count
- = (__last - __first) >> 2;
+ typename iterator_traits<_RandomAccessIterator>::difference_type
+ __trip_count = (__last - __first) >> 2;
- for ( ; __trip_count > 0 ; --__trip_count) {
- if (*__first == __val) return __first;
- ++__first;
+ for (; __trip_count > 0; --__trip_count)
+ {
+ if (*__first == __val)
+ return __first;
+ ++__first;
- if (*__first == __val) return __first;
- ++__first;
+ if (*__first == __val)
+ return __first;
+ ++__first;
- if (*__first == __val) return __first;
- ++__first;
+ if (*__first == __val)
+ return __first;
+ ++__first;
- if (*__first == __val) return __first;
- ++__first;
- }
+ if (*__first == __val)
+ return __first;
+ ++__first;
+ }
- switch(__last - __first) {
- case 3:
- if (*__first == __val) return __first;
- ++__first;
- case 2:
- if (*__first == __val) return __first;
- ++__first;
- case 1:
- if (*__first == __val) return __first;
- ++__first;
- case 0:
- default:
- return __last;
- }
+ switch (__last - __first)
+ {
+ case 3:
+ if (*__first == __val)
+ return __first;
+ ++__first;
+ case 2:
+ if (*__first == __val)
+ return __first;
+ ++__first;
+ case 1:
+ if (*__first == __val)
+ return __first;
+ ++__first;
+ case 0:
+ default:
+ return __last;
+ }
}
- /**
- * @if maint
- * This is an overload used by find_if() for the RAI case.
- * @endif
- */
+ /// This is an overload used by find_if() for the RAI case.
template<typename _RandomAccessIterator, typename _Predicate>
_RandomAccessIterator
- find_if(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Predicate __pred,
- random_access_iterator_tag)
+ __find_if(_RandomAccessIterator __first, _RandomAccessIterator __last,
+ _Predicate __pred, random_access_iterator_tag)
{
- typename iterator_traits<_RandomAccessIterator>::difference_type __trip_count
- = (__last - __first) >> 2;
+ typename iterator_traits<_RandomAccessIterator>::difference_type
+ __trip_count = (__last - __first) >> 2;
- for ( ; __trip_count > 0 ; --__trip_count) {
- if (__pred(*__first)) return __first;
- ++__first;
+ for (; __trip_count > 0; --__trip_count)
+ {
+ if (__pred(*__first))
+ return __first;
+ ++__first;
- if (__pred(*__first)) return __first;
- ++__first;
+ if (__pred(*__first))
+ return __first;
+ ++__first;
- if (__pred(*__first)) return __first;
- ++__first;
+ if (__pred(*__first))
+ return __first;
+ ++__first;
- if (__pred(*__first)) return __first;
- ++__first;
- }
+ if (__pred(*__first))
+ return __first;
+ ++__first;
+ }
- switch(__last - __first) {
- case 3:
- if (__pred(*__first)) return __first;
- ++__first;
- case 2:
- if (__pred(*__first)) return __first;
- ++__first;
- case 1:
- if (__pred(*__first)) return __first;
- ++__first;
- case 0:
- default:
- return __last;
- }
+ switch (__last - __first)
+ {
+ case 3:
+ if (__pred(*__first))
+ return __first;
+ ++__first;
+ case 2:
+ if (__pred(*__first))
+ return __first;
+ ++__first;
+ case 1:
+ if (__pred(*__first))
+ return __first;
+ ++__first;
+ case 0:
+ default:
+ return __last;
+ }
}
- /**
- * @brief Find the first occurrence of a value in a sequence.
- * @param first An input iterator.
- * @param last An input iterator.
- * @param val The value to find.
- * @return The first iterator @c i in the range @p [first,last)
- * such that @c *i == @p val, or @p last if no such iterator exists.
- */
- template<typename _InputIterator, typename _Tp>
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /// This is an overload used by find_if_not() for the Input Iterator case.
+ template<typename _InputIterator, typename _Predicate>
inline _InputIterator
- find(_InputIterator __first, _InputIterator __last,
- const _Tp& __val)
+ __find_if_not(_InputIterator __first, _InputIterator __last,
+ _Predicate __pred, input_iterator_tag)
{
- // concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_EqualOpConcept<
- typename iterator_traits<_InputIterator>::value_type, _Tp>)
- __glibcxx_requires_valid_range(__first, __last);
- return std::find(__first, __last, __val, std::__iterator_category(__first));
+ while (__first != __last && bool(__pred(*__first)))
+ ++__first;
+ return __first;
}
- /**
- * @brief Find the first element in a sequence for which a predicate is true.
- * @param first An input iterator.
- * @param last An input iterator.
- * @param pred A predicate.
- * @return The first iterator @c i in the range @p [first,last)
- * such that @p pred(*i) is true, or @p last if no such iterator exists.
- */
- template<typename _InputIterator, typename _Predicate>
- inline _InputIterator
- find_if(_InputIterator __first, _InputIterator __last,
- _Predicate __pred)
+ /// This is an overload used by find_if_not() for the RAI case.
+ template<typename _RandomAccessIterator, typename _Predicate>
+ _RandomAccessIterator
+ __find_if_not(_RandomAccessIterator __first, _RandomAccessIterator __last,
+ _Predicate __pred, random_access_iterator_tag)
{
- // concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
- typename iterator_traits<_InputIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
- return std::find_if(__first, __last, __pred, std::__iterator_category(__first));
+ typename iterator_traits<_RandomAccessIterator>::difference_type
+ __trip_count = (__last - __first) >> 2;
+
+ for (; __trip_count > 0; --__trip_count)
+ {
+ if (!bool(__pred(*__first)))
+ return __first;
+ ++__first;
+
+ if (!bool(__pred(*__first)))
+ return __first;
+ ++__first;
+
+ if (!bool(__pred(*__first)))
+ return __first;
+ ++__first;
+
+ if (!bool(__pred(*__first)))
+ return __first;
+ ++__first;
+ }
+
+ switch (__last - __first)
+ {
+ case 3:
+ if (!bool(__pred(*__first)))
+ return __first;
+ ++__first;
+ case 2:
+ if (!bool(__pred(*__first)))
+ return __first;
+ ++__first;
+ case 1:
+ if (!bool(__pred(*__first)))
+ return __first;
+ ++__first;
+ case 0:
+ default:
+ return __last;
+ }
}
+#endif
+
+ // set_difference
+ // set_intersection
+ // set_symmetric_difference
+ // set_union
+ // for_each
+ // find
+ // find_if
+ // find_first_of
+ // adjacent_find
+ // count
+ // count_if
+ // search
/**
- * @brief Find two adjacent values in a sequence that are equal.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @return The first iterator @c i such that @c i and @c i+1 are both
- * valid iterators in @p [first,last) and such that @c *i == @c *(i+1),
- * or @p last if no such iterator exists.
+ * This is an uglified
+ * search_n(_ForwardIterator, _ForwardIterator, _Integer, const _Tp&)
+ * overloaded for forward iterators.
*/
- template<typename _ForwardIterator>
+ template<typename _ForwardIterator, typename _Integer, typename _Tp>
_ForwardIterator
- adjacent_find(_ForwardIterator __first, _ForwardIterator __last)
- {
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_EqualityComparableConcept<
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
- if (__first == __last)
- return __last;
- _ForwardIterator __next = __first;
- while(++__next != __last) {
- if (*__first == *__next)
- return __first;
- __first = __next;
- }
+ __search_n(_ForwardIterator __first, _ForwardIterator __last,
+ _Integer __count, const _Tp& __val,
+ std::forward_iterator_tag)
+ {
+ __first = _GLIBCXX_STD_P::find(__first, __last, __val);
+ while (__first != __last)
+ {
+ typename iterator_traits<_ForwardIterator>::difference_type
+ __n = __count;
+ _ForwardIterator __i = __first;
+ ++__i;
+ while (__i != __last && __n != 1 && *__i == __val)
+ {
+ ++__i;
+ --__n;
+ }
+ if (__n == 1)
+ return __first;
+ if (__i == __last)
+ return __last;
+ __first = _GLIBCXX_STD_P::find(++__i, __last, __val);
+ }
return __last;
}
/**
- * @brief Find two adjacent values in a sequence using a predicate.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @param binary_pred A binary predicate.
- * @return The first iterator @c i such that @c i and @c i+1 are both
- * valid iterators in @p [first,last) and such that
- * @p binary_pred(*i,*(i+1)) is true, or @p last if no such iterator
- * exists.
+ * This is an uglified
+ * search_n(_ForwardIterator, _ForwardIterator, _Integer, const _Tp&)
+ * overloaded for random access iterators.
*/
- template<typename _ForwardIterator, typename _BinaryPredicate>
- _ForwardIterator
- adjacent_find(_ForwardIterator __first, _ForwardIterator __last,
- _BinaryPredicate __binary_pred)
- {
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
- typename iterator_traits<_ForwardIterator>::value_type,
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
- if (__first == __last)
- return __last;
- _ForwardIterator __next = __first;
- while(++__next != __last) {
- if (__binary_pred(*__first, *__next))
- return __first;
- __first = __next;
- }
- return __last;
+ template<typename _RandomAccessIter, typename _Integer, typename _Tp>
+ _RandomAccessIter
+ __search_n(_RandomAccessIter __first, _RandomAccessIter __last,
+ _Integer __count, const _Tp& __val,
+ std::random_access_iterator_tag)
+ {
+
+ typedef typename std::iterator_traits<_RandomAccessIter>::difference_type
+ _DistanceType;
+
+ _DistanceType __tailSize = __last - __first;
+ const _DistanceType __pattSize = __count;
+
+ if (__tailSize < __pattSize)
+ return __last;
+
+ const _DistanceType __skipOffset = __pattSize - 1;
+ _RandomAccessIter __lookAhead = __first + __skipOffset;
+ __tailSize -= __pattSize;
+
+ while (1) // the main loop...
+ {
+ // __lookAhead here is always pointing to the last element of next
+ // possible match.
+ while (!(*__lookAhead == __val)) // the skip loop...
+ {
+ if (__tailSize < __pattSize)
+ return __last; // Failure
+ __lookAhead += __pattSize;
+ __tailSize -= __pattSize;
+ }
+ _DistanceType __remainder = __skipOffset;
+ for (_RandomAccessIter __backTrack = __lookAhead - 1;
+ *__backTrack == __val; --__backTrack)
+ {
+ if (--__remainder == 0)
+ return (__lookAhead - __skipOffset); // Success
+ }
+ if (__remainder > __tailSize)
+ return __last; // Failure
+ __lookAhead += __remainder;
+ __tailSize -= __remainder;
+ }
}
+ // search_n
+
/**
- * @brief Count the number of copies of a value in a sequence.
- * @param first An input iterator.
- * @param last An input iterator.
- * @param value The value to be counted.
- * @return The number of iterators @c i in the range @p [first,last)
- * for which @c *i == @p value
+ * This is an uglified
+ * search_n(_ForwardIterator, _ForwardIterator, _Integer, const _Tp&,
+ * _BinaryPredicate)
+ * overloaded for forward iterators.
*/
- template<typename _InputIterator, typename _Tp>
- typename iterator_traits<_InputIterator>::difference_type
- count(_InputIterator __first, _InputIterator __last, const _Tp& __value)
+ template<typename _ForwardIterator, typename _Integer, typename _Tp,
+ typename _BinaryPredicate>
+ _ForwardIterator
+ __search_n(_ForwardIterator __first, _ForwardIterator __last,
+ _Integer __count, const _Tp& __val,
+ _BinaryPredicate __binary_pred, std::forward_iterator_tag)
{
- // concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_EqualityComparableConcept<
- typename iterator_traits<_InputIterator>::value_type >)
- __glibcxx_function_requires(_EqualityComparableConcept<_Tp>)
- __glibcxx_requires_valid_range(__first, __last);
- typename iterator_traits<_InputIterator>::difference_type __n = 0;
- for ( ; __first != __last; ++__first)
- if (*__first == __value)
- ++__n;
- return __n;
+ while (__first != __last && !bool(__binary_pred(*__first, __val)))
+ ++__first;
+
+ while (__first != __last)
+ {
+ typename iterator_traits<_ForwardIterator>::difference_type
+ __n = __count;
+ _ForwardIterator __i = __first;
+ ++__i;
+ while (__i != __last && __n != 1 && bool(__binary_pred(*__i, __val)))
+ {
+ ++__i;
+ --__n;
+ }
+ if (__n == 1)
+ return __first;
+ if (__i == __last)
+ return __last;
+ __first = ++__i;
+ while (__first != __last
+ && !bool(__binary_pred(*__first, __val)))
+ ++__first;
+ }
+ return __last;
}
/**
- * @brief Count the elements of a sequence for which a predicate is true.
- * @param first An input iterator.
- * @param last An input iterator.
- * @param pred A predicate.
- * @return The number of iterators @c i in the range @p [first,last)
- * for which @p pred(*i) is true.
+ * This is an uglified
+ * search_n(_ForwardIterator, _ForwardIterator, _Integer, const _Tp&,
+ * _BinaryPredicate)
+ * overloaded for random access iterators.
*/
- template<typename _InputIterator, typename _Predicate>
- typename iterator_traits<_InputIterator>::difference_type
- count_if(_InputIterator __first, _InputIterator __last, _Predicate __pred)
- {
- // concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
- typename iterator_traits<_InputIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
- typename iterator_traits<_InputIterator>::difference_type __n = 0;
- for ( ; __first != __last; ++__first)
- if (__pred(*__first))
- ++__n;
- return __n;
+ template<typename _RandomAccessIter, typename _Integer, typename _Tp,
+ typename _BinaryPredicate>
+ _RandomAccessIter
+ __search_n(_RandomAccessIter __first, _RandomAccessIter __last,
+ _Integer __count, const _Tp& __val,
+ _BinaryPredicate __binary_pred, std::random_access_iterator_tag)
+ {
+
+ typedef typename std::iterator_traits<_RandomAccessIter>::difference_type
+ _DistanceType;
+
+ _DistanceType __tailSize = __last - __first;
+ const _DistanceType __pattSize = __count;
+
+ if (__tailSize < __pattSize)
+ return __last;
+
+ const _DistanceType __skipOffset = __pattSize - 1;
+ _RandomAccessIter __lookAhead = __first + __skipOffset;
+ __tailSize -= __pattSize;
+
+ while (1) // the main loop...
+ {
+ // __lookAhead here is always pointing to the last element of next
+ // possible match.
+ while (!bool(__binary_pred(*__lookAhead, __val))) // the skip loop...
+ {
+ if (__tailSize < __pattSize)
+ return __last; // Failure
+ __lookAhead += __pattSize;
+ __tailSize -= __pattSize;
+ }
+ _DistanceType __remainder = __skipOffset;
+ for (_RandomAccessIter __backTrack = __lookAhead - 1;
+ __binary_pred(*__backTrack, __val); --__backTrack)
+ {
+ if (--__remainder == 0)
+ return (__lookAhead - __skipOffset); // Success
+ }
+ if (__remainder > __tailSize)
+ return __last; // Failure
+ __lookAhead += __remainder;
+ __tailSize -= __remainder;
+ }
+ }
+
+ // find_end for forward iterators.
+ template<typename _ForwardIterator1, typename _ForwardIterator2>
+ _ForwardIterator1
+ __find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2,
+ forward_iterator_tag, forward_iterator_tag)
+ {
+ if (__first2 == __last2)
+ return __last1;
+ else
+ {
+ _ForwardIterator1 __result = __last1;
+ while (1)
+ {
+ _ForwardIterator1 __new_result
+ = _GLIBCXX_STD_P::search(__first1, __last1, __first2, __last2);
+ if (__new_result == __last1)
+ return __result;
+ else
+ {
+ __result = __new_result;
+ __first1 = __new_result;
+ ++__first1;
+ }
+ }
+ }
+ }
+
+ template<typename _ForwardIterator1, typename _ForwardIterator2,
+ typename _BinaryPredicate>
+ _ForwardIterator1
+ __find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2,
+ forward_iterator_tag, forward_iterator_tag,
+ _BinaryPredicate __comp)
+ {
+ if (__first2 == __last2)
+ return __last1;
+ else
+ {
+ _ForwardIterator1 __result = __last1;
+ while (1)
+ {
+ _ForwardIterator1 __new_result
+ = _GLIBCXX_STD_P::search(__first1, __last1, __first2,
+ __last2, __comp);
+ if (__new_result == __last1)
+ return __result;
+ else
+ {
+ __result = __new_result;
+ __first1 = __new_result;
+ ++__first1;
+ }
+ }
+ }
+ }
+
+ // find_end for bidirectional iterators (much faster).
+ template<typename _BidirectionalIterator1, typename _BidirectionalIterator2>
+ _BidirectionalIterator1
+ __find_end(_BidirectionalIterator1 __first1,
+ _BidirectionalIterator1 __last1,
+ _BidirectionalIterator2 __first2,
+ _BidirectionalIterator2 __last2,
+ bidirectional_iterator_tag, bidirectional_iterator_tag)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator1>)
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator2>)
+
+ typedef reverse_iterator<_BidirectionalIterator1> _RevIterator1;
+ typedef reverse_iterator<_BidirectionalIterator2> _RevIterator2;
+
+ _RevIterator1 __rlast1(__first1);
+ _RevIterator2 __rlast2(__first2);
+ _RevIterator1 __rresult = _GLIBCXX_STD_P::search(_RevIterator1(__last1),
+ __rlast1,
+ _RevIterator2(__last2),
+ __rlast2);
+
+ if (__rresult == __rlast1)
+ return __last1;
+ else
+ {
+ _BidirectionalIterator1 __result = __rresult.base();
+ std::advance(__result, -std::distance(__first2, __last2));
+ return __result;
+ }
}
+ template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
+ typename _BinaryPredicate>
+ _BidirectionalIterator1
+ __find_end(_BidirectionalIterator1 __first1,
+ _BidirectionalIterator1 __last1,
+ _BidirectionalIterator2 __first2,
+ _BidirectionalIterator2 __last2,
+ bidirectional_iterator_tag, bidirectional_iterator_tag,
+ _BinaryPredicate __comp)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator1>)
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator2>)
+
+ typedef reverse_iterator<_BidirectionalIterator1> _RevIterator1;
+ typedef reverse_iterator<_BidirectionalIterator2> _RevIterator2;
+
+ _RevIterator1 __rlast1(__first1);
+ _RevIterator2 __rlast2(__first2);
+ _RevIterator1 __rresult = std::search(_RevIterator1(__last1), __rlast1,
+ _RevIterator2(__last2), __rlast2,
+ __comp);
+
+ if (__rresult == __rlast1)
+ return __last1;
+ else
+ {
+ _BidirectionalIterator1 __result = __rresult.base();
+ std::advance(__result, -std::distance(__first2, __last2));
+ return __result;
+ }
+ }
/**
- * @brief Search a sequence for a matching sub-sequence.
- * @param first1 A forward iterator.
- * @param last1 A forward iterator.
- * @param first2 A forward iterator.
- * @param last2 A forward iterator.
- * @return The first iterator @c i in the range
+ * @brief Find last matching subsequence in a sequence.
+ * @ingroup non_mutating_algorithms
+ * @param first1 Start of range to search.
+ * @param last1 End of range to search.
+ * @param first2 Start of sequence to match.
+ * @param last2 End of sequence to match.
+ * @return The last iterator @c i in the range
* @p [first1,last1-(last2-first2)) such that @c *(i+N) == @p *(first2+N)
* for each @c N in the range @p [0,last2-first2), or @p last1 if no
* such iterator exists.
* Searches the range @p [first1,last1) for a sub-sequence that compares
* equal value-by-value with the sequence given by @p [first2,last2) and
* returns an iterator to the first element of the sub-sequence, or
- * @p last1 if the sub-sequence is not found.
+ * @p last1 if the sub-sequence is not found. The sub-sequence will be the
+ * last such subsequence contained in [first,last1).
*
* Because the sub-sequence must lie completely within the range
* @p [first1,last1) it must start at a position less than
* @p [first1,last1-(last2-first2))
*/
template<typename _ForwardIterator1, typename _ForwardIterator2>
- _ForwardIterator1
- search(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
- _ForwardIterator2 __first2, _ForwardIterator2 __last2)
+ inline _ForwardIterator1
+ find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
typename iterator_traits<_ForwardIterator2>::value_type>)
__glibcxx_requires_valid_range(__first1, __last1);
__glibcxx_requires_valid_range(__first2, __last2);
- // Test for empty ranges
- if (__first1 == __last1 || __first2 == __last2)
- return __first1;
-
- // Test for a pattern of length 1.
- _ForwardIterator2 __tmp(__first2);
- ++__tmp;
- if (__tmp == __last2)
- return std::find(__first1, __last1, *__first2);
-
- // General case.
-
- _ForwardIterator2 __p1, __p;
-
- __p1 = __first2; ++__p1;
-
- _ForwardIterator1 __current = __first1;
-
- while (__first1 != __last1) {
- __first1 = std::find(__first1, __last1, *__first2);
- if (__first1 == __last1)
- return __last1;
-
- __p = __p1;
- __current = __first1;
- if (++__current == __last1)
- return __last1;
-
- while (*__current == *__p) {
- if (++__p == __last2)
- return __first1;
- if (++__current == __last1)
- return __last1;
- }
- ++__first1;
- }
- return __first1;
+ return std::__find_end(__first1, __last1, __first2, __last2,
+ std::__iterator_category(__first1),
+ std::__iterator_category(__first2));
}
/**
- * @brief Search a sequence for a matching sub-sequence using a predicate.
- * @param first1 A forward iterator.
- * @param last1 A forward iterator.
- * @param first2 A forward iterator.
- * @param last2 A forward iterator.
- * @param predicate A binary predicate.
- * @return The first iterator @c i in the range
- * @p [first1,last1-(last2-first2)) such that
- * @p predicate(*(i+N),*(first2+N)) is true for each @c N in the range
- * @p [0,last2-first2), or @p last1 if no such iterator exists.
+ * @brief Find last matching subsequence in a sequence using a predicate.
+ * @ingroup non_mutating_algorithms
+ * @param first1 Start of range to search.
+ * @param last1 End of range to search.
+ * @param first2 Start of sequence to match.
+ * @param last2 End of sequence to match.
+ * @param comp The predicate to use.
+ * @return The last iterator @c i in the range
+ * @p [first1,last1-(last2-first2)) such that @c predicate(*(i+N), @p
+ * (first2+N)) is true for each @c N in the range @p [0,last2-first2), or
+ * @p last1 if no such iterator exists.
*
* Searches the range @p [first1,last1) for a sub-sequence that compares
- * equal value-by-value with the sequence given by @p [first2,last2),
- * using @p predicate to determine equality, and returns an iterator
- * to the first element of the sub-sequence, or @p last1 if no such
- * iterator exists.
+ * equal value-by-value with the sequence given by @p [first2,last2) using
+ * comp as a predicate and returns an iterator to the first element of the
+ * sub-sequence, or @p last1 if the sub-sequence is not found. The
+ * sub-sequence will be the last such subsequence contained in
+ * [first,last1).
*
- * @see search(_ForwardIter1, _ForwardIter1, _ForwardIter2, _ForwardIter2)
+ * Because the sub-sequence must lie completely within the range
+ * @p [first1,last1) it must start at a position less than
+ * @p last1-(last2-first2) where @p last2-first2 is the length of the
+ * sub-sequence.
+ * This means that the returned iterator @c i will be in the range
+ * @p [first1,last1-(last2-first2))
*/
- template<typename _ForwardIterator1, typename _ForwardIterator2, typename _BinaryPredicate>
- _ForwardIterator1
- search(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
- _ForwardIterator2 __first2, _ForwardIterator2 __last2,
- _BinaryPredicate __predicate)
+ template<typename _ForwardIterator1, typename _ForwardIterator2,
+ typename _BinaryPredicate>
+ inline _ForwardIterator1
+ find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2,
+ _BinaryPredicate __comp)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
__glibcxx_requires_valid_range(__first1, __last1);
__glibcxx_requires_valid_range(__first2, __last2);
- // Test for empty ranges
- if (__first1 == __last1 || __first2 == __last2)
- return __first1;
-
- // Test for a pattern of length 1.
- _ForwardIterator2 __tmp(__first2);
- ++__tmp;
- if (__tmp == __last2) {
- while (__first1 != __last1 && !__predicate(*__first1, *__first2))
- ++__first1;
- return __first1;
- }
-
- // General case.
-
- _ForwardIterator2 __p1, __p;
-
- __p1 = __first2; ++__p1;
+ return std::__find_end(__first1, __last1, __first2, __last2,
+ std::__iterator_category(__first1),
+ std::__iterator_category(__first2),
+ __comp);
+ }
- _ForwardIterator1 __current = __first1;
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * @brief Checks that a predicate is true for all the elements
+ * of a sequence.
+ * @ingroup non_mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param pred A predicate.
+ * @return True if the check is true, false otherwise.
+ *
+ * Returns true if @p pred is true for each element in the range
+ * @p [first,last), and false otherwise.
+ */
+ template<typename _InputIterator, typename _Predicate>
+ inline bool
+ all_of(_InputIterator __first, _InputIterator __last, _Predicate __pred)
+ { return __last == std::find_if_not(__first, __last, __pred); }
- while (__first1 != __last1) {
- while (__first1 != __last1) {
- if (__predicate(*__first1, *__first2))
- break;
- ++__first1;
- }
- while (__first1 != __last1 && !__predicate(*__first1, *__first2))
- ++__first1;
- if (__first1 == __last1)
- return __last1;
+ /**
+ * @brief Checks that a predicate is false for all the elements
+ * of a sequence.
+ * @ingroup non_mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param pred A predicate.
+ * @return True if the check is true, false otherwise.
+ *
+ * Returns true if @p pred is false for each element in the range
+ * @p [first,last), and false otherwise.
+ */
+ template<typename _InputIterator, typename _Predicate>
+ inline bool
+ none_of(_InputIterator __first, _InputIterator __last, _Predicate __pred)
+ { return __last == _GLIBCXX_STD_P::find_if(__first, __last, __pred); }
- __p = __p1;
- __current = __first1;
- if (++__current == __last1) return __last1;
+ /**
+ * @brief Checks that a predicate is false for at least an element
+ * of a sequence.
+ * @ingroup non_mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param pred A predicate.
+ * @return True if the check is true, false otherwise.
+ *
+ * Returns true if an element exists in the range @p [first,last) such that
+ * @p pred is true, and false otherwise.
+ */
+ template<typename _InputIterator, typename _Predicate>
+ inline bool
+ any_of(_InputIterator __first, _InputIterator __last, _Predicate __pred)
+ { return !std::none_of(__first, __last, __pred); }
- while (__predicate(*__current, *__p)) {
- if (++__p == __last2)
- return __first1;
- if (++__current == __last1)
- return __last1;
- }
+ /**
+ * @brief Find the first element in a sequence for which a
+ * predicate is false.
+ * @ingroup non_mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param pred A predicate.
+ * @return The first iterator @c i in the range @p [first,last)
+ * such that @p pred(*i) is false, or @p last if no such iterator exists.
+ */
+ template<typename _InputIterator, typename _Predicate>
+ inline _InputIterator
+ find_if_not(_InputIterator __first, _InputIterator __last,
+ _Predicate __pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+ return std::__find_if_not(__first, __last, __pred,
+ std::__iterator_category(__first));
+ }
- ++__first1;
- }
- return __first1;
+ /**
+ * @brief Checks whether the sequence is partitioned.
+ * @ingroup mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param pred A predicate.
+ * @return True if the range @p [first,last) is partioned by @p pred,
+ * i.e. if all elements that satisfy @p pred appear before those that
+ * do not.
+ */
+ template<typename _InputIterator, typename _Predicate>
+ inline bool
+ is_partitioned(_InputIterator __first, _InputIterator __last,
+ _Predicate __pred)
+ {
+ __first = std::find_if_not(__first, __last, __pred);
+ return std::none_of(__first, __last, __pred);
}
/**
- * @brief Search a sequence for a number of consecutive values.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @param count The number of consecutive values.
- * @param val The value to find.
- * @return The first iterator @c i in the range @p [first,last-count)
- * such that @c *(i+N) == @p val for each @c N in the range @p [0,count),
- * or @p last if no such iterator exists.
- *
- * Searches the range @p [first,last) for @p count consecutive elements
- * equal to @p val.
+ * @brief Find the partition point of a partitioned range.
+ * @ingroup mutating_algorithms
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param pred A predicate.
+ * @return An iterator @p mid such that @p all_of(first, mid, pred)
+ * and @p none_of(mid, last, pred) are both true.
*/
- template<typename _ForwardIterator, typename _Integer, typename _Tp>
+ template<typename _ForwardIterator, typename _Predicate>
_ForwardIterator
- search_n(_ForwardIterator __first, _ForwardIterator __last,
- _Integer __count, const _Tp& __val)
+ partition_point(_ForwardIterator __first, _ForwardIterator __last,
+ _Predicate __pred)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_EqualityComparableConcept<
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_function_requires(_EqualityComparableConcept<_Tp>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+
+ // A specific debug-mode test will be necessary...
__glibcxx_requires_valid_range(__first, __last);
- if (__count <= 0)
- return __first;
- else {
- __first = std::find(__first, __last, __val);
- while (__first != __last) {
- typename iterator_traits<_ForwardIterator>::difference_type __n = __count;
- _ForwardIterator __i = __first;
- ++__i;
- while (__i != __last && __n != 1 && *__i == __val) {
- ++__i;
- --__n;
- }
- if (__n == 1)
- return __first;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle;
+
+ while (__len > 0)
+ {
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (__pred(*__middle))
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
else
- __first = std::find(__i, __last, __val);
+ __len = __half;
}
- return __last;
- }
+ return __first;
}
+#endif
+
/**
- * @brief Search a sequence for a number of consecutive values using a
- * predicate.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @param count The number of consecutive values.
- * @param val The value to find.
- * @param binary_pred A binary predicate.
- * @return The first iterator @c i in the range @p [first,last-count)
- * such that @p binary_pred(*(i+N),val) is true for each @c N in the
- * range @p [0,count), or @p last if no such iterator exists.
+ * @brief Copy a sequence, removing elements of a given value.
+ * @ingroup mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @param value The value to be removed.
+ * @return An iterator designating the end of the resulting sequence.
*
- * Searches the range @p [first,last) for @p count consecutive elements
- * for which the predicate returns true.
+ * Copies each element in the range @p [first,last) not equal to @p value
+ * to the range beginning at @p result.
+ * remove_copy() is stable, so the relative order of elements that are
+ * copied is unchanged.
*/
- template<typename _ForwardIterator, typename _Integer, typename _Tp,
- typename _BinaryPredicate>
- _ForwardIterator
- search_n(_ForwardIterator __first, _ForwardIterator __last,
- _Integer __count, const _Tp& __val,
- _BinaryPredicate __binary_pred)
+ template<typename _InputIterator, typename _OutputIterator, typename _Tp>
+ _OutputIterator
+ remove_copy(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result, const _Tp& __value)
{
// concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
- typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_InputIterator>::value_type, _Tp>)
__glibcxx_requires_valid_range(__first, __last);
- if (__count <= 0)
- return __first;
- else {
- while (__first != __last) {
- if (__binary_pred(*__first, __val))
- break;
- ++__first;
- }
- while (__first != __last) {
- typename iterator_traits<_ForwardIterator>::difference_type __n = __count;
- _ForwardIterator __i = __first;
- ++__i;
- while (__i != __last && __n != 1 && __binary_pred(*__i, __val)) {
- ++__i;
- --__n;
- }
- if (__n == 1)
- return __first;
- else {
- while (__i != __last) {
- if (__binary_pred(*__i, __val))
- break;
- ++__i;
- }
- __first = __i;
+ for (; __first != __last; ++__first)
+ if (!(*__first == __value))
+ {
+ *__result = *__first;
+ ++__result;
}
- }
- return __last;
- }
+ return __result;
}
/**
- * @brief Swap the elements of two sequences.
- * @param first1 A forward iterator.
- * @param last1 A forward iterator.
- * @param first2 A forward iterator.
- * @return An iterator equal to @p first2+(last1-first1).
+ * @brief Copy a sequence, removing elements for which a predicate is true.
+ * @ingroup mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @param pred A predicate.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * Copies each element in the range @p [first,last) for which
+ * @p pred returns false to the range beginning at @p result.
*
- * Swaps each element in the range @p [first1,last1) with the
- * corresponding element in the range @p [first2,(last1-first1)).
- * The ranges must not overlap.
+ * remove_copy_if() is stable, so the relative order of elements that are
+ * copied is unchanged.
*/
- template<typename _ForwardIterator1, typename _ForwardIterator2>
- _ForwardIterator2
- swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
- _ForwardIterator2 __first2)
+ template<typename _InputIterator, typename _OutputIterator,
+ typename _Predicate>
+ _OutputIterator
+ remove_copy_if(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result, _Predicate __pred)
{
// concept requirements
- __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIterator1>)
- __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIterator2>)
- __glibcxx_function_requires(_ConvertibleConcept<
- typename iterator_traits<_ForwardIterator1>::value_type,
- typename iterator_traits<_ForwardIterator2>::value_type>)
- __glibcxx_function_requires(_ConvertibleConcept<
- typename iterator_traits<_ForwardIterator2>::value_type,
- typename iterator_traits<_ForwardIterator1>::value_type>)
- __glibcxx_requires_valid_range(__first1, __last1);
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
- for ( ; __first1 != __last1; ++__first1, ++__first2)
- std::iter_swap(__first1, __first2);
- return __first2;
+ for (; __first != __last; ++__first)
+ if (!bool(__pred(*__first)))
+ {
+ *__result = *__first;
+ ++__result;
+ }
+ return __result;
}
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
/**
- * @brief Perform an operation on a sequence.
- * @param first An input iterator.
- * @param last An input iterator.
- * @param result An output iterator.
- * @param unary_op A unary operator.
- * @return An output iterator equal to @p result+(last-first).
+ * @brief Copy the elements of a sequence for which a predicate is true.
+ * @ingroup mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @param pred A predicate.
+ * @return An iterator designating the end of the resulting sequence.
*
- * Applies the operator to each element in the input range and assigns
- * the results to successive elements of the output sequence.
- * Evaluates @p *(result+N)=unary_op(*(first+N)) for each @c N in the
- * range @p [0,last-first).
+ * Copies each element in the range @p [first,last) for which
+ * @p pred returns true to the range beginning at @p result.
*
- * @p unary_op must not alter its argument.
+ * copy_if() is stable, so the relative order of elements that are
+ * copied is unchanged.
*/
- template<typename _InputIterator, typename _OutputIterator, typename _UnaryOperation>
+ template<typename _InputIterator, typename _OutputIterator,
+ typename _Predicate>
_OutputIterator
- transform(_InputIterator __first, _InputIterator __last,
- _OutputIterator __result, _UnaryOperation __unary_op)
+ copy_if(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result, _Predicate __pred)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- // "the type returned by a _UnaryOperation"
- __typeof__(__unary_op(*__first))>)
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
- for ( ; __first != __last; ++__first, ++__result)
- *__result = __unary_op(*__first);
+ for (; __first != __last; ++__first)
+ if (__pred(*__first))
+ {
+ *__result = *__first;
+ ++__result;
+ }
return __result;
}
- /**
- * @brief Perform an operation on corresponding elements of two sequences.
- * @param first1 An input iterator.
- * @param last1 An input iterator.
- * @param first2 An input iterator.
- * @param result An output iterator.
- * @param binary_op A binary operator.
- * @return An output iterator equal to @p result+(last-first).
- *
- * Applies the operator to the corresponding elements in the two
- * input ranges and assigns the results to successive elements of the
- * output sequence.
- * Evaluates @p *(result+N)=binary_op(*(first1+N),*(first2+N)) for each
- * @c N in the range @p [0,last1-first1).
- *
- * @p binary_op must not alter either of its arguments.
- */
- template<typename _InputIterator1, typename _InputIterator2, typename _OutputIterator,
- typename _BinaryOperation>
+
+ template<typename _InputIterator, typename _Size, typename _OutputIterator>
_OutputIterator
- transform(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _OutputIterator __result,
- _BinaryOperation __binary_op)
+ __copy_n(_InputIterator __first, _Size __n,
+ _OutputIterator __result, input_iterator_tag)
{
- // concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- // "the type returned by a _BinaryOperation"
- __typeof__(__binary_op(*__first1,*__first2))>)
- __glibcxx_requires_valid_range(__first1, __last1);
-
- for ( ; __first1 != __last1; ++__first1, ++__first2, ++__result)
- *__result = __binary_op(*__first1, *__first2);
+ for (; __n > 0; --__n)
+ {
+ *__result = *__first;
+ ++__first;
+ ++__result;
+ }
return __result;
}
+ template<typename _RandomAccessIterator, typename _Size,
+ typename _OutputIterator>
+ inline _OutputIterator
+ __copy_n(_RandomAccessIterator __first, _Size __n,
+ _OutputIterator __result, random_access_iterator_tag)
+ { return std::copy(__first, __first + __n, __result); }
+
/**
- * @brief Replace each occurrence of one value in a sequence with another
- * value.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @param old_value The value to be replaced.
- * @param new_value The replacement value.
- * @return replace() returns no value.
+ * @brief Copies the range [first,first+n) into [result,result+n).
+ * @ingroup mutating_algorithms
+ * @param first An input iterator.
+ * @param n The number of elements to copy.
+ * @param result An output iterator.
+ * @return result+n.
*
- * For each iterator @c i in the range @p [first,last) if @c *i ==
- * @p old_value then the assignment @c *i = @p new_value is performed.
+ * This inline function will boil down to a call to @c memmove whenever
+ * possible. Failing that, if random access iterators are passed, then the
+ * loop count will be known (and therefore a candidate for compiler
+ * optimizations such as unrolling).
*/
- template<typename _ForwardIterator, typename _Tp>
- void
- replace(_ForwardIterator __first, _ForwardIterator __last,
- const _Tp& __old_value, const _Tp& __new_value)
+ template<typename _InputIterator, typename _Size, typename _OutputIterator>
+ inline _OutputIterator
+ copy_n(_InputIterator __first, _Size __n, _OutputIterator __result)
{
// concept requirements
- __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_EqualOpConcept<
- typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
- __glibcxx_function_requires(_ConvertibleConcept<_Tp,
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ typename iterator_traits<_InputIterator>::value_type>)
- for ( ; __first != __last; ++__first)
- if (*__first == __old_value)
- *__first = __new_value;
+ return std::__copy_n(__first, __n, __result,
+ std::__iterator_category(__first));
}
/**
- * @brief Replace each value in a sequence for which a predicate returns
- * true with another value.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @param pred A predicate.
- * @param new_value The replacement value.
- * @return replace_if() returns no value.
+ * @brief Copy the elements of a sequence to separate output sequences
+ * depending on the truth value of a predicate.
+ * @ingroup mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param out_true An output iterator.
+ * @param out_false An output iterator.
+ * @param pred A predicate.
+ * @return A pair designating the ends of the resulting sequences.
*
- * For each iterator @c i in the range @p [first,last) if @p pred(*i)
- * is true then the assignment @c *i = @p new_value is performed.
+ * Copies each element in the range @p [first,last) for which
+ * @p pred returns true to the range beginning at @p out_true
+ * and each element for which @p pred returns false to @p out_false.
*/
- template<typename _ForwardIterator, typename _Predicate, typename _Tp>
- void
- replace_if(_ForwardIterator __first, _ForwardIterator __last,
- _Predicate __pred, const _Tp& __new_value)
+ template<typename _InputIterator, typename _OutputIterator1,
+ typename _OutputIterator2, typename _Predicate>
+ pair<_OutputIterator1, _OutputIterator2>
+ partition_copy(_InputIterator __first, _InputIterator __last,
+ _OutputIterator1 __out_true, _OutputIterator2 __out_false,
+ _Predicate __pred)
{
// concept requirements
- __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_ConvertibleConcept<_Tp,
- typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator1,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator2,
+ typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
- typename iterator_traits<_ForwardIterator>::value_type>)
+ typename iterator_traits<_InputIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
-
- for ( ; __first != __last; ++__first)
+
+ for (; __first != __last; ++__first)
if (__pred(*__first))
- *__first = __new_value;
+ {
+ *__out_true = *__first;
+ ++__out_true;
+ }
+ else
+ {
+ *__out_false = *__first;
+ ++__out_false;
+ }
+
+ return pair<_OutputIterator1, _OutputIterator2>(__out_true, __out_false);
}
+#endif
/**
- * @brief Copy a sequence, replacing each element of one value with another
- * value.
- * @param first An input iterator.
- * @param last An input iterator.
- * @param result An output iterator.
- * @param old_value The value to be replaced.
- * @param new_value The replacement value.
- * @return The end of the output sequence, @p result+(last-first).
+ * @brief Remove elements from a sequence.
+ * @ingroup mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param value The value to be removed.
+ * @return An iterator designating the end of the resulting sequence.
*
- * Copies each element in the input range @p [first,last) to the
- * output range @p [result,result+(last-first)) replacing elements
- * equal to @p old_value with @p new_value.
+ * All elements equal to @p value are removed from the range
+ * @p [first,last).
+ *
+ * remove() is stable, so the relative order of elements that are
+ * not removed is unchanged.
+ *
+ * Elements between the end of the resulting sequence and @p last
+ * are still present, but their value is unspecified.
*/
- template<typename _InputIterator, typename _OutputIterator, typename _Tp>
- _OutputIterator
- replace_copy(_InputIterator __first, _InputIterator __last,
- _OutputIterator __result,
- const _Tp& __old_value, const _Tp& __new_value)
+ template<typename _ForwardIterator, typename _Tp>
+ _ForwardIterator
+ remove(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __value)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
__glibcxx_function_requires(_EqualOpConcept<
- typename iterator_traits<_InputIterator>::value_type, _Tp>)
- __glibcxx_requires_valid_range(__first, __last);
-
- for ( ; __first != __last; ++__first, ++__result)
- *__result = *__first == __old_value ? __new_value : *__first;
- return __result;
- }
-
- /**
- * @brief Copy a sequence, replacing each value for which a predicate
- * returns true with another value.
- * @param first An input iterator.
- * @param last An input iterator.
- * @param result An output iterator.
- * @param pred A predicate.
- * @param new_value The replacement value.
- * @return The end of the output sequence, @p result+(last-first).
- *
- * Copies each element in the range @p [first,last) to the range
- * @p [result,result+(last-first)) replacing elements for which
- * @p pred returns true with @p new_value.
- */
- template<typename _InputIterator, typename _OutputIterator, typename _Predicate,
- typename _Tp>
- _OutputIterator
- replace_copy_if(_InputIterator __first, _InputIterator __last,
- _OutputIterator __result,
- _Predicate __pred, const _Tp& __new_value)
- {
- // concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator>::value_type>)
- __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
- typename iterator_traits<_InputIterator>::value_type>)
+ typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
__glibcxx_requires_valid_range(__first, __last);
- for ( ; __first != __last; ++__first, ++__result)
- *__result = __pred(*__first) ? __new_value : *__first;
+ __first = _GLIBCXX_STD_P::find(__first, __last, __value);
+ if(__first == __last)
+ return __first;
+ _ForwardIterator __result = __first;
+ ++__first;
+ for(; __first != __last; ++__first)
+ if(!(*__first == __value))
+ {
+ *__result = _GLIBCXX_MOVE(*__first);
+ ++__result;
+ }
return __result;
}
/**
- * @brief Assign the result of a function object to each value in a
- * sequence.
+ * @brief Remove elements from a sequence using a predicate.
+ * @ingroup mutating_algorithms
* @param first A forward iterator.
* @param last A forward iterator.
- * @param gen A function object taking no arguments.
- * @return generate() returns no value.
- *
- * Performs the assignment @c *i = @p gen() for each @c i in the range
- * @p [first,last).
- */
- template<typename _ForwardIterator, typename _Generator>
- void
- generate(_ForwardIterator __first, _ForwardIterator __last, _Generator __gen)
- {
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_GeneratorConcept<_Generator,
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
-
- for ( ; __first != __last; ++__first)
- *__first = __gen();
- }
-
- /**
- * @brief Assign the result of a function object to each value in a
- * sequence.
- * @param first A forward iterator.
- * @param n The length of the sequence.
- * @param gen A function object taking no arguments.
- * @return The end of the sequence, @p first+n
- *
- * Performs the assignment @c *i = @p gen() for each @c i in the range
- * @p [first,first+n).
- */
- template<typename _OutputIterator, typename _Size, typename _Generator>
- _OutputIterator
- generate_n(_OutputIterator __first, _Size __n, _Generator __gen)
- {
- // concept requirements
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- // "the type returned by a _Generator"
- __typeof__(__gen())>)
-
- for ( ; __n > 0; --__n, ++__first)
- *__first = __gen();
- return __first;
- }
-
- /**
- * @brief Copy a sequence, removing elements of a given value.
- * @param first An input iterator.
- * @param last An input iterator.
- * @param result An output iterator.
- * @param value The value to be removed.
+ * @param pred A predicate.
* @return An iterator designating the end of the resulting sequence.
*
- * Copies each element in the range @p [first,last) not equal to @p value
- * to the range beginning at @p result.
- * remove_copy() is stable, so the relative order of elements that are
- * copied is unchanged.
- */
- template<typename _InputIterator, typename _OutputIterator, typename _Tp>
- _OutputIterator
- remove_copy(_InputIterator __first, _InputIterator __last,
- _OutputIterator __result, const _Tp& __value)
- {
- // concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator>::value_type>)
- __glibcxx_function_requires(_EqualOpConcept<
- typename iterator_traits<_InputIterator>::value_type, _Tp>)
- __glibcxx_requires_valid_range(__first, __last);
-
- for ( ; __first != __last; ++__first)
- if (!(*__first == __value)) {
- *__result = *__first;
- ++__result;
- }
- return __result;
- }
-
- /**
- * @brief Copy a sequence, removing elements for which a predicate is true.
- * @param first An input iterator.
- * @param last An input iterator.
- * @param result An output iterator.
- * @param pred A predicate.
- * @return An iterator designating the end of the resulting sequence.
+ * All elements for which @p pred returns true are removed from the range
+ * @p [first,last).
*
- * Copies each element in the range @p [first,last) for which
- * @p pred returns true to the range beginning at @p result.
+ * remove_if() is stable, so the relative order of elements that are
+ * not removed is unchanged.
*
- * remove_copy_if() is stable, so the relative order of elements that are
- * copied is unchanged.
+ * Elements between the end of the resulting sequence and @p last
+ * are still present, but their value is unspecified.
*/
- template<typename _InputIterator, typename _OutputIterator, typename _Predicate>
- _OutputIterator
- remove_copy_if(_InputIterator __first, _InputIterator __last,
- _OutputIterator __result, _Predicate __pred)
+ template<typename _ForwardIterator, typename _Predicate>
+ _ForwardIterator
+ remove_if(_ForwardIterator __first, _ForwardIterator __last,
+ _Predicate __pred)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
__glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
- typename iterator_traits<_InputIterator>::value_type>)
+ typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
- for ( ; __first != __last; ++__first)
- if (!__pred(*__first)) {
- *__result = *__first;
- ++__result;
- }
+ __first = _GLIBCXX_STD_P::find_if(__first, __last, __pred);
+ if(__first == __last)
+ return __first;
+ _ForwardIterator __result = __first;
+ ++__first;
+ for(; __first != __last; ++__first)
+ if(!bool(__pred(*__first)))
+ {
+ *__result = _GLIBCXX_MOVE(*__first);
+ ++__result;
+ }
return __result;
}
/**
- * @brief Remove elements from a sequence.
- * @param first An input iterator.
- * @param last An input iterator.
- * @param value The value to be removed.
- * @return An iterator designating the end of the resulting sequence.
- *
- * All elements equal to @p value are removed from the range
- * @p [first,last).
+ * @brief Remove consecutive duplicate values from a sequence.
+ * @ingroup mutating_algorithms
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @return An iterator designating the end of the resulting sequence.
*
- * remove() is stable, so the relative order of elements that are
+ * Removes all but the first element from each group of consecutive
+ * values that compare equal.
+ * unique() is stable, so the relative order of elements that are
* not removed is unchanged.
- *
* Elements between the end of the resulting sequence and @p last
* are still present, but their value is unspecified.
*/
- template<typename _ForwardIterator, typename _Tp>
+ template<typename _ForwardIterator>
_ForwardIterator
- remove(_ForwardIterator __first, _ForwardIterator __last,
- const _Tp& __value)
+ unique(_ForwardIterator __first, _ForwardIterator __last)
{
// concept requirements
- __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_ConvertibleConcept<_Tp,
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_function_requires(_EqualOpConcept<
- typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_EqualityComparableConcept<
+ typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
- __first = std::find(__first, __last, __value);
- _ForwardIterator __i = __first;
- return __first == __last ? __first
- : std::remove_copy(++__i, __last, __first, __value);
+ // Skip the beginning, if already unique.
+ __first = _GLIBCXX_STD_P::adjacent_find(__first, __last);
+ if (__first == __last)
+ return __last;
+
+ // Do the real copy work.
+ _ForwardIterator __dest = __first;
+ ++__first;
+ while (++__first != __last)
+ if (!(*__dest == *__first))
+ *++__dest = _GLIBCXX_MOVE(*__first);
+ return ++__dest;
}
/**
- * @brief Remove elements from a sequence using a predicate.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @param pred A predicate.
- * @return An iterator designating the end of the resulting sequence.
- *
- * All elements for which @p pred returns true are removed from the range
- * @p [first,last).
+ * @brief Remove consecutive values from a sequence using a predicate.
+ * @ingroup mutating_algorithms
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param binary_pred A binary predicate.
+ * @return An iterator designating the end of the resulting sequence.
*
- * remove_if() is stable, so the relative order of elements that are
+ * Removes all but the first element from each group of consecutive
+ * values for which @p binary_pred returns true.
+ * unique() is stable, so the relative order of elements that are
* not removed is unchanged.
- *
* Elements between the end of the resulting sequence and @p last
* are still present, but their value is unspecified.
*/
- template<typename _ForwardIterator, typename _Predicate>
+ template<typename _ForwardIterator, typename _BinaryPredicate>
_ForwardIterator
- remove_if(_ForwardIterator __first, _ForwardIterator __last,
- _Predicate __pred)
+ unique(_ForwardIterator __first, _ForwardIterator __last,
+ _BinaryPredicate __binary_pred)
{
// concept requirements
- __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
- typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
- __first = std::find_if(__first, __last, __pred);
- _ForwardIterator __i = __first;
- return __first == __last ? __first
- : std::remove_copy_if(++__i, __last, __first, __pred);
+ // Skip the beginning, if already unique.
+ __first = _GLIBCXX_STD_P::adjacent_find(__first, __last, __binary_pred);
+ if (__first == __last)
+ return __last;
+
+ // Do the real copy work.
+ _ForwardIterator __dest = __first;
+ ++__first;
+ while (++__first != __last)
+ if (!bool(__binary_pred(*__dest, *__first)))
+ *++__dest = _GLIBCXX_MOVE(*__first);
+ return ++__dest;
+ }
+
+ /**
+ * This is an uglified unique_copy(_InputIterator, _InputIterator,
+ * _OutputIterator)
+ * overloaded for forward iterators and output iterator as result.
+ */
+ template<typename _ForwardIterator, typename _OutputIterator>
+ _OutputIterator
+ __unique_copy(_ForwardIterator __first, _ForwardIterator __last,
+ _OutputIterator __result,
+ forward_iterator_tag, output_iterator_tag)
+ {
+ // concept requirements -- taken care of in dispatching function
+ _ForwardIterator __next = __first;
+ *__result = *__first;
+ while (++__next != __last)
+ if (!(*__first == *__next))
+ {
+ __first = __next;
+ *++__result = *__first;
+ }
+ return ++__result;
}
/**
- * @if maint
- * This is an uglified unique_copy(_InputIterator, _InputIterator, _OutputIterator)
- * overloaded for output iterators.
- * @endif
+ * This is an uglified unique_copy(_InputIterator, _InputIterator,
+ * _OutputIterator)
+ * overloaded for input iterators and output iterator as result.
*/
template<typename _InputIterator, typename _OutputIterator>
_OutputIterator
__unique_copy(_InputIterator __first, _InputIterator __last,
_OutputIterator __result,
- output_iterator_tag)
+ input_iterator_tag, output_iterator_tag)
{
// concept requirements -- taken care of in dispatching function
typename iterator_traits<_InputIterator>::value_type __value = *__first;
*__result = __value;
while (++__first != __last)
- if (!(__value == *__first)) {
- __value = *__first;
- *++__result = __value;
- }
+ if (!(__value == *__first))
+ {
+ __value = *__first;
+ *++__result = __value;
+ }
return ++__result;
}
/**
- * @if maint
- * This is an uglified unique_copy(_InputIterator, _InputIterator, _OutputIterator)
- * overloaded for forward iterators.
- * @endif
+ * This is an uglified unique_copy(_InputIterator, _InputIterator,
+ * _OutputIterator)
+ * overloaded for input iterators and forward iterator as result.
*/
template<typename _InputIterator, typename _ForwardIterator>
_ForwardIterator
__unique_copy(_InputIterator __first, _InputIterator __last,
_ForwardIterator __result,
- forward_iterator_tag)
+ input_iterator_tag, forward_iterator_tag)
{
// concept requirements -- taken care of in dispatching function
*__result = *__first;
}
/**
- * @if maint
* This is an uglified
- * unique_copy(_InputIterator, _InputIterator, _OutputIterator, _BinaryPredicate)
- * overloaded for output iterators.
- * @endif
+ * unique_copy(_InputIterator, _InputIterator, _OutputIterator,
+ * _BinaryPredicate)
+ * overloaded for forward iterators and output iterator as result.
*/
- template<typename _InputIterator, typename _OutputIterator, typename _BinaryPredicate>
+ template<typename _ForwardIterator, typename _OutputIterator,
+ typename _BinaryPredicate>
_OutputIterator
- __unique_copy(_InputIterator __first, _InputIterator __last,
- _OutputIterator __result,
- _BinaryPredicate __binary_pred,
- output_iterator_tag)
+ __unique_copy(_ForwardIterator __first, _ForwardIterator __last,
+ _OutputIterator __result, _BinaryPredicate __binary_pred,
+ forward_iterator_tag, output_iterator_tag)
{
// concept requirements -- iterators already checked
__glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
- typename iterator_traits<_InputIterator>::value_type,
- typename iterator_traits<_InputIterator>::value_type>)
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
- typename iterator_traits<_InputIterator>::value_type __value = *__first;
- *__result = __value;
- while (++__first != __last)
- if (!__binary_pred(__value, *__first)) {
- __value = *__first;
- *++__result = __value;
- }
+ _ForwardIterator __next = __first;
+ *__result = *__first;
+ while (++__next != __last)
+ if (!bool(__binary_pred(*__first, *__next)))
+ {
+ __first = __next;
+ *++__result = *__first;
+ }
return ++__result;
}
/**
- * @if maint
* This is an uglified
- * unique_copy(_InputIterator, _InputIterator, _OutputIterator, _BinaryPredicate)
- * overloaded for forward iterators.
- * @endif
+ * unique_copy(_InputIterator, _InputIterator, _OutputIterator,
+ * _BinaryPredicate)
+ * overloaded for input iterators and output iterator as result.
*/
- template<typename _InputIterator, typename _ForwardIterator, typename _BinaryPredicate>
- _ForwardIterator
+ template<typename _InputIterator, typename _OutputIterator,
+ typename _BinaryPredicate>
+ _OutputIterator
__unique_copy(_InputIterator __first, _InputIterator __last,
- _ForwardIterator __result,
- _BinaryPredicate __binary_pred,
- forward_iterator_tag)
+ _OutputIterator __result, _BinaryPredicate __binary_pred,
+ input_iterator_tag, output_iterator_tag)
{
// concept requirements -- iterators already checked
__glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
- typename iterator_traits<_ForwardIterator>::value_type,
- typename iterator_traits<_InputIterator>::value_type>)
+ typename iterator_traits<_InputIterator>::value_type,
+ typename iterator_traits<_InputIterator>::value_type>)
- *__result = *__first;
+ typename iterator_traits<_InputIterator>::value_type __value = *__first;
+ *__result = __value;
while (++__first != __last)
- if (!__binary_pred(*__result, *__first)) *++__result = *__first;
+ if (!bool(__binary_pred(__value, *__first)))
+ {
+ __value = *__first;
+ *++__result = __value;
+ }
return ++__result;
}
/**
- * @brief Copy a sequence, removing consecutive duplicate values.
- * @param first An input iterator.
- * @param last An input iterator.
- * @param result An output iterator.
- * @return An iterator designating the end of the resulting sequence.
- *
- * Copies each element in the range @p [first,last) to the range
- * beginning at @p result, except that only the first element is copied
- * from groups of consecutive elements that compare equal.
- * unique_copy() is stable, so the relative order of elements that are
- * copied is unchanged.
- */
- template<typename _InputIterator, typename _OutputIterator>
- inline _OutputIterator
- unique_copy(_InputIterator __first, _InputIterator __last,
- _OutputIterator __result)
- {
- // concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator>::value_type>)
- __glibcxx_function_requires(_EqualityComparableConcept<
- typename iterator_traits<_InputIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
-
- typedef typename iterator_traits<_OutputIterator>::iterator_category _IterType;
-
- if (__first == __last) return __result;
- return std::__unique_copy(__first, __last, __result, _IterType());
- }
-
- /**
- * @brief Copy a sequence, removing consecutive values using a predicate.
- * @param first An input iterator.
- * @param last An input iterator.
- * @param result An output iterator.
- * @param binary_pred A binary predicate.
- * @return An iterator designating the end of the resulting sequence.
- *
- * Copies each element in the range @p [first,last) to the range
- * beginning at @p result, except that only the first element is copied
- * from groups of consecutive elements for which @p binary_pred returns
- * true.
- * unique_copy() is stable, so the relative order of elements that are
- * copied is unchanged.
- */
- template<typename _InputIterator, typename _OutputIterator, typename _BinaryPredicate>
- inline _OutputIterator
- unique_copy(_InputIterator __first, _InputIterator __last,
- _OutputIterator __result,
- _BinaryPredicate __binary_pred)
- {
- // concept requirements -- predicates checked later
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
-
- typedef typename iterator_traits<_OutputIterator>::iterator_category _IterType;
-
- if (__first == __last) return __result;
- return std::__unique_copy(__first, __last, __result, __binary_pred, _IterType());
- }
-
- /**
- * @brief Remove consecutive duplicate values from a sequence.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @return An iterator designating the end of the resulting sequence.
- *
- * Removes all but the first element from each group of consecutive
- * values that compare equal.
- * unique() is stable, so the relative order of elements that are
- * not removed is unchanged.
- * Elements between the end of the resulting sequence and @p last
- * are still present, but their value is unspecified.
- */
- template<typename _ForwardIterator>
- _ForwardIterator
- unique(_ForwardIterator __first, _ForwardIterator __last)
- {
- // concept requirements
- __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_EqualityComparableConcept<
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
-
- // Skip the beginning, if already unique.
- __first = std::adjacent_find(__first, __last);
- if (__first == __last)
- return __last;
-
- // Do the real copy work.
- _ForwardIterator __dest = __first;
- ++__first;
- while (++__first != __last)
- if (!(*__dest == *__first))
- *++__dest = *__first;
- return ++__dest;
- }
-
- /**
- * @brief Remove consecutive values from a sequence using a predicate.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @param binary_pred A binary predicate.
- * @return An iterator designating the end of the resulting sequence.
- *
- * Removes all but the first element from each group of consecutive
- * values for which @p binary_pred returns true.
- * unique() is stable, so the relative order of elements that are
- * not removed is unchanged.
- * Elements between the end of the resulting sequence and @p last
- * are still present, but their value is unspecified.
+ * This is an uglified
+ * unique_copy(_InputIterator, _InputIterator, _OutputIterator,
+ * _BinaryPredicate)
+ * overloaded for input iterators and forward iterator as result.
*/
- template<typename _ForwardIterator, typename _BinaryPredicate>
+ template<typename _InputIterator, typename _ForwardIterator,
+ typename _BinaryPredicate>
_ForwardIterator
- unique(_ForwardIterator __first, _ForwardIterator __last,
- _BinaryPredicate __binary_pred)
+ __unique_copy(_InputIterator __first, _InputIterator __last,
+ _ForwardIterator __result, _BinaryPredicate __binary_pred,
+ input_iterator_tag, forward_iterator_tag)
{
- // concept requirements
- __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIterator>)
+ // concept requirements -- iterators already checked
__glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
- typename iterator_traits<_ForwardIterator>::value_type,
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
-
- // Skip the beginning, if already unique.
- __first = std::adjacent_find(__first, __last, __binary_pred);
- if (__first == __last)
- return __last;
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_InputIterator>::value_type>)
- // Do the real copy work.
- _ForwardIterator __dest = __first;
- ++__first;
+ *__result = *__first;
while (++__first != __last)
- if (!__binary_pred(*__dest, *__first))
- *++__dest = *__first;
- return ++__dest;
+ if (!bool(__binary_pred(*__result, *__first)))
+ *++__result = *__first;
+ return ++__result;
}
/**
- * @if maint
- * This is an uglified reverse(_BidirectionalIterator, _BidirectionalIterator)
+ * This is an uglified reverse(_BidirectionalIterator,
+ * _BidirectionalIterator)
* overloaded for bidirectional iterators.
- * @endif
*/
template<typename _BidirectionalIterator>
void
__reverse(_BidirectionalIterator __first, _BidirectionalIterator __last,
- bidirectional_iterator_tag)
+ bidirectional_iterator_tag)
{
while (true)
if (__first == __last || __first == --__last)
return;
else
- std::iter_swap(__first++, __last);
+ {
+ std::iter_swap(__first, __last);
+ ++__first;
+ }
}
/**
- * @if maint
- * This is an uglified reverse(_BidirectionalIterator, _BidirectionalIterator)
- * overloaded for bidirectional iterators.
- * @endif
+ * This is an uglified reverse(_BidirectionalIterator,
+ * _BidirectionalIterator)
+ * overloaded for random access iterators.
*/
template<typename _RandomAccessIterator>
void
__reverse(_RandomAccessIterator __first, _RandomAccessIterator __last,
- random_access_iterator_tag)
+ random_access_iterator_tag)
{
+ if (__first == __last)
+ return;
+ --__last;
while (__first < __last)
- std::iter_swap(__first++, --__last);
+ {
+ std::iter_swap(__first, __last);
+ ++__first;
+ --__last;
+ }
}
/**
* @brief Reverse a sequence.
+ * @ingroup mutating_algorithms
* @param first A bidirectional iterator.
* @param last A bidirectional iterator.
* @return reverse() returns no value.
{
// concept requirements
__glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<
- _BidirectionalIterator>)
+ _BidirectionalIterator>)
__glibcxx_requires_valid_range(__first, __last);
std::__reverse(__first, __last, std::__iterator_category(__first));
}
/**
* @brief Copy a sequence, reversing its elements.
+ * @ingroup mutating_algorithms
* @param first A bidirectional iterator.
* @param last A bidirectional iterator.
* @param result An output iterator.
template<typename _BidirectionalIterator, typename _OutputIterator>
_OutputIterator
reverse_copy(_BidirectionalIterator __first, _BidirectionalIterator __last,
- _OutputIterator __result)
+ _OutputIterator __result)
{
// concept requirements
- __glibcxx_function_requires(_BidirectionalIteratorConcept<_BidirectionalIterator>)
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
typename iterator_traits<_BidirectionalIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
- while (__first != __last) {
- --__last;
- *__result = *__last;
- ++__result;
- }
+ while (__first != __last)
+ {
+ --__last;
+ *__result = *__last;
+ ++__result;
+ }
return __result;
}
-
/**
- * @if maint
* This is a helper function for the rotate algorithm specialized on RAIs.
* It returns the greatest common divisor of two integer values.
- * @endif
*/
template<typename _EuclideanRingElement>
_EuclideanRingElement
__gcd(_EuclideanRingElement __m, _EuclideanRingElement __n)
{
- while (__n != 0) {
- _EuclideanRingElement __t = __m % __n;
- __m = __n;
- __n = __t;
- }
+ while (__n != 0)
+ {
+ _EuclideanRingElement __t = __m % __n;
+ __m = __n;
+ __n = __t;
+ }
return __m;
}
- /**
- * @if maint
- * This is a helper function for the rotate algorithm.
- * @endif
- */
+ /// This is a helper function for the rotate algorithm.
template<typename _ForwardIterator>
void
__rotate(_ForwardIterator __first,
_ForwardIterator __middle,
_ForwardIterator __last,
- forward_iterator_tag)
+ forward_iterator_tag)
{
- if ((__first == __middle) || (__last == __middle))
+ if (__first == __middle || __last == __middle)
return;
_ForwardIterator __first2 = __middle;
- do {
- swap(*__first++, *__first2++);
- if (__first == __middle)
- __middle = __first2;
- } while (__first2 != __last);
+ do
+ {
+ std::iter_swap(__first, __first2);
+ ++__first;
+ ++__first2;
+ if (__first == __middle)
+ __middle = __first2;
+ }
+ while (__first2 != __last);
__first2 = __middle;
- while (__first2 != __last) {
- swap(*__first++, *__first2++);
- if (__first == __middle)
- __middle = __first2;
- else if (__first2 == __last)
- __first2 = __middle;
- }
+ while (__first2 != __last)
+ {
+ std::iter_swap(__first, __first2);
+ ++__first;
+ ++__first2;
+ if (__first == __middle)
+ __middle = __first2;
+ else if (__first2 == __last)
+ __first2 = __middle;
+ }
}
- /**
- * @if maint
- * This is a helper function for the rotate algorithm.
- * @endif
- */
+ /// This is a helper function for the rotate algorithm.
template<typename _BidirectionalIterator>
void
__rotate(_BidirectionalIterator __first,
{
// concept requirements
__glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<
- _BidirectionalIterator>)
+ _BidirectionalIterator>)
- if ((__first == __middle) || (__last == __middle))
+ if (__first == __middle || __last == __middle)
return;
std::__reverse(__first, __middle, bidirectional_iterator_tag());
std::__reverse(__middle, __last, bidirectional_iterator_tag());
while (__first != __middle && __middle != __last)
- swap(*__first++, *--__last);
+ {
+ std::iter_swap(__first, --__last);
+ ++__first;
+ }
- if (__first == __middle) {
+ if (__first == __middle)
std::__reverse(__middle, __last, bidirectional_iterator_tag());
- }
- else {
+ else
std::__reverse(__first, __middle, bidirectional_iterator_tag());
- }
}
- /**
- * @if maint
- * This is a helper function for the rotate algorithm.
- * @endif
- */
+ /// This is a helper function for the rotate algorithm.
template<typename _RandomAccessIterator>
void
__rotate(_RandomAccessIterator __first,
{
// concept requirements
__glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
+ _RandomAccessIterator>)
- if ((__first == __middle) || (__last == __middle))
+ if (__first == __middle || __last == __middle)
return;
- typedef typename iterator_traits<_RandomAccessIterator>::difference_type _Distance;
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _Distance;
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
_Distance __n = __last - __first;
_Distance __k = __middle - __first;
- _Distance __l = __n - __k;
-
- if (__k == __l) {
- std::swap_ranges(__first, __middle, __middle);
- return;
- }
- _Distance __d = __gcd(__n, __k);
-
- for (_Distance __i = 0; __i < __d; __i++) {
- _ValueType __tmp = *__first;
- _RandomAccessIterator __p = __first;
-
- if (__k < __l) {
- for (_Distance __j = 0; __j < __l/__d; __j++) {
- if (__p > __first + __l) {
- *__p = *(__p - __l);
- __p -= __l;
- }
-
- *__p = *(__p + __k);
- __p += __k;
- }
+ if (__k == __n - __k)
+ {
+ std::swap_ranges(__first, __middle, __middle);
+ return;
}
- else {
- for (_Distance __j = 0; __j < __k/__d - 1; __j ++) {
- if (__p < __last - __k) {
- *__p = *(__p + __k);
- __p += __k;
+ _RandomAccessIterator __p = __first;
+
+ for (;;)
+ {
+ if (__k < __n - __k)
+ {
+ if (__is_pod(_ValueType) && __k == 1)
+ {
+ _ValueType __t = _GLIBCXX_MOVE(*__p);
+ _GLIBCXX_MOVE3(__p + 1, __p + __n, __p);
+ *(__p + __n - 1) = _GLIBCXX_MOVE(__t);
+ return;
+ }
+ _RandomAccessIterator __q = __p + __k;
+ for (_Distance __i = 0; __i < __n - __k; ++ __i)
+ {
+ std::iter_swap(__p, __q);
+ ++__p;
+ ++__q;
+ }
+ __n %= __k;
+ if (__n == 0)
+ return;
+ std::swap(__n, __k);
+ __k = __n - __k;
+ }
+ else
+ {
+ __k = __n - __k;
+ if (__is_pod(_ValueType) && __k == 1)
+ {
+ _ValueType __t = _GLIBCXX_MOVE(*(__p + __n - 1));
+ _GLIBCXX_MOVE_BACKWARD3(__p, __p + __n - 1, __p + __n);
+ *__p = _GLIBCXX_MOVE(__t);
+ return;
+ }
+ _RandomAccessIterator __q = __p + __n;
+ __p = __q - __k;
+ for (_Distance __i = 0; __i < __n - __k; ++ __i)
+ {
+ --__p;
+ --__q;
+ std::iter_swap(__p, __q);
+ }
+ __n %= __k;
+ if (__n == 0)
+ return;
+ std::swap(__n, __k);
}
-
- *__p = * (__p - __l);
- __p -= __l;
- }
}
-
- *__p = __tmp;
- ++__first;
- }
}
/**
* @brief Rotate the elements of a sequence.
+ * @ingroup mutating_algorithms
* @param first A forward iterator.
* @param middle A forward iterator.
* @param last A forward iterator.
*/
template<typename _ForwardIterator>
inline void
- rotate(_ForwardIterator __first, _ForwardIterator __middle, _ForwardIterator __last)
+ rotate(_ForwardIterator __first, _ForwardIterator __middle,
+ _ForwardIterator __last)
{
// concept requirements
- __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
__glibcxx_requires_valid_range(__first, __middle);
__glibcxx_requires_valid_range(__middle, __last);
- typedef typename iterator_traits<_ForwardIterator>::iterator_category _IterType;
+ typedef typename iterator_traits<_ForwardIterator>::iterator_category
+ _IterType;
std::__rotate(__first, __middle, __last, _IterType());
}
/**
* @brief Copy a sequence, rotating its elements.
+ * @ingroup mutating_algorithms
* @param first A forward iterator.
* @param middle A forward iterator.
* @param last A forward iterator.
__glibcxx_requires_valid_range(__first, __middle);
__glibcxx_requires_valid_range(__middle, __last);
- return std::copy(__first, __middle, copy(__middle, __last, __result));
- }
-
-
- /**
- * @if maint
- * Return a random number in the range [0, __n). This function encapsulates
- * whether we're using rand (part of the standard C library) or lrand48
- * (not standard, but a much better choice whenever it's available).
- *
- * XXX There is no corresponding encapsulation fn to seed the generator.
- * @endif
- */
- template<typename _Distance>
- inline _Distance
- __random_number(_Distance __n)
- {
- #ifdef _GLIBCXX_HAVE_LRAND48
- return lrand48() % __n;
- #else
- return rand() % __n;
- #endif
- }
-
-
- /**
- * @brief Randomly shuffle the elements of a sequence.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @return Nothing.
- *
- * Reorder the elements in the range @p [first,last) using a random
- * distribution, so that every possible ordering of the sequence is
- * equally likely.
- */
- template<typename _RandomAccessIterator>
- inline void
- random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last)
- {
- // concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
- __glibcxx_requires_valid_range(__first, __last);
-
- if (__first == __last) return;
- for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
- std::iter_swap(__i, __first + std::__random_number((__i - __first) + 1));
- }
-
- /**
- * @brief Shuffle the elements of a sequence using a random number
- * generator.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @param rand The RNG functor or function.
- * @return Nothing.
- *
- * Reorders the elements in the range @p [first,last) using @p rand to
- * provide a random distribution. Calling @p rand(N) for a positive
- * integer @p N should return a randomly chosen integer from the
- * range [0,N).
- */
- template<typename _RandomAccessIterator, typename _RandomNumberGenerator>
- void
- random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _RandomNumberGenerator& __rand)
- {
- // concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
- __glibcxx_requires_valid_range(__first, __last);
-
- if (__first == __last) return;
- for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
- std::iter_swap(__i, __first + __rand((__i - __first) + 1));
+ return std::copy(__first, __middle,
+ std::copy(__middle, __last, __result));
}
-
- /**
- * @if maint
- * This is a helper function...
- * @endif
- */
+ /// This is a helper function...
template<typename _ForwardIterator, typename _Predicate>
_ForwardIterator
__partition(_ForwardIterator __first, _ForwardIterator __last,
- _Predicate __pred,
- forward_iterator_tag)
+ _Predicate __pred, forward_iterator_tag)
{
- if (__first == __last) return __first;
+ if (__first == __last)
+ return __first;
while (__pred(*__first))
- if (++__first == __last) return __first;
+ if (++__first == __last)
+ return __first;
_ForwardIterator __next = __first;
while (++__next != __last)
- if (__pred(*__next)) {
- swap(*__first, *__next);
- ++__first;
- }
+ if (__pred(*__next))
+ {
+ std::iter_swap(__first, __next);
+ ++__first;
+ }
return __first;
}
- /**
- * @if maint
- * This is a helper function...
- * @endif
- */
+ /// This is a helper function...
template<typename _BidirectionalIterator, typename _Predicate>
_BidirectionalIterator
__partition(_BidirectionalIterator __first, _BidirectionalIterator __last,
- _Predicate __pred,
- bidirectional_iterator_tag)
+ _Predicate __pred, bidirectional_iterator_tag)
{
- while (true) {
- while (true)
- if (__first == __last)
- return __first;
- else if (__pred(*__first))
- ++__first;
- else
- break;
- --__last;
- while (true)
- if (__first == __last)
- return __first;
- else if (!__pred(*__last))
- --__last;
- else
- break;
- std::iter_swap(__first, __last);
- ++__first;
- }
- }
-
- /**
- * @brief Move elements for which a predicate is true to the beginning
- * of a sequence.
- * @param first A forward iterator.
- * @param last A forward iterator.
- * @param pred A predicate functor.
- * @return An iterator @p middle such that @p pred(i) is true for each
- * iterator @p i in the range @p [first,middle) and false for each @p i
- * in the range @p [middle,last).
- *
- * @p pred must not modify its operand. @p partition() does not preserve
- * the relative ordering of elements in each group, use
- * @p stable_partition() if this is needed.
- */
- template<typename _ForwardIterator, typename _Predicate>
- inline _ForwardIterator
- partition(_ForwardIterator __first, _ForwardIterator __last,
- _Predicate __pred)
- {
- // concept requirements
- __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
-
- return std::__partition(__first, __last, __pred, std::__iterator_category(__first));
+ while (true)
+ {
+ while (true)
+ if (__first == __last)
+ return __first;
+ else if (__pred(*__first))
+ ++__first;
+ else
+ break;
+ --__last;
+ while (true)
+ if (__first == __last)
+ return __first;
+ else if (!bool(__pred(*__last)))
+ --__last;
+ else
+ break;
+ std::iter_swap(__first, __last);
+ ++__first;
+ }
}
+ // partition
- /**
- * @if maint
- * This is a helper function...
- * @endif
- */
+ /// This is a helper function...
template<typename _ForwardIterator, typename _Predicate, typename _Distance>
_ForwardIterator
- __inplace_stable_partition(_ForwardIterator __first, _ForwardIterator __last,
+ __inplace_stable_partition(_ForwardIterator __first,
+ _ForwardIterator __last,
_Predicate __pred, _Distance __len)
{
if (__len == 1)
return __pred(*__first) ? __last : __first;
_ForwardIterator __middle = __first;
std::advance(__middle, __len / 2);
- _ForwardIterator __begin = std::__inplace_stable_partition(__first, __middle,
+ _ForwardIterator __begin = std::__inplace_stable_partition(__first,
+ __middle,
__pred,
__len / 2);
_ForwardIterator __end = std::__inplace_stable_partition(__middle, __last,
__pred,
- __len - __len / 2);
+ __len
+ - __len / 2);
std::rotate(__begin, __middle, __end);
std::advance(__begin, std::distance(__middle, __end));
return __begin;
}
- /**
- * @if maint
- * This is a helper function...
- * @endif
- */
+ /// This is a helper function...
template<typename _ForwardIterator, typename _Pointer, typename _Predicate,
typename _Distance>
_ForwardIterator
- __stable_partition_adaptive(_ForwardIterator __first, _ForwardIterator __last,
+ __stable_partition_adaptive(_ForwardIterator __first,
+ _ForwardIterator __last,
_Predicate __pred, _Distance __len,
_Pointer __buffer,
_Distance __buffer_size)
{
- if (__len <= __buffer_size) {
- _ForwardIterator __result1 = __first;
- _Pointer __result2 = __buffer;
- for ( ; __first != __last ; ++__first)
- if (__pred(*__first)) {
- *__result1 = *__first;
- ++__result1;
- }
- else {
- *__result2 = *__first;
- ++__result2;
- }
- std::copy(__buffer, __result2, __result1);
- return __result1;
- }
- else {
- _ForwardIterator __middle = __first;
- std::advance(__middle, __len / 2);
- _ForwardIterator __begin = std::__stable_partition_adaptive(__first, __middle,
- __pred,
- __len / 2,
- __buffer, __buffer_size);
- _ForwardIterator __end = std::__stable_partition_adaptive( __middle, __last,
- __pred,
- __len - __len / 2,
- __buffer, __buffer_size);
- std::rotate(__begin, __middle, __end);
- std::advance(__begin, std::distance(__middle, __end));
- return __begin;
- }
+ if (__len <= __buffer_size)
+ {
+ _ForwardIterator __result1 = __first;
+ _Pointer __result2 = __buffer;
+ for (; __first != __last; ++__first)
+ if (__pred(*__first))
+ {
+ *__result1 = _GLIBCXX_MOVE(*__first);
+ ++__result1;
+ }
+ else
+ {
+ *__result2 = _GLIBCXX_MOVE(*__first);
+ ++__result2;
+ }
+ _GLIBCXX_MOVE3(__buffer, __result2, __result1);
+ return __result1;
+ }
+ else
+ {
+ _ForwardIterator __middle = __first;
+ std::advance(__middle, __len / 2);
+ _ForwardIterator __begin =
+ std::__stable_partition_adaptive(__first, __middle, __pred,
+ __len / 2, __buffer,
+ __buffer_size);
+ _ForwardIterator __end =
+ std::__stable_partition_adaptive(__middle, __last, __pred,
+ __len - __len / 2,
+ __buffer, __buffer_size);
+ std::rotate(__begin, __middle, __end);
+ std::advance(__begin, std::distance(__middle, __end));
+ return __begin;
+ }
}
/**
* @brief Move elements for which a predicate is true to the beginning
* of a sequence, preserving relative ordering.
+ * @ingroup mutating_algorithms
* @param first A forward iterator.
* @param last A forward iterator.
* @param pred A predicate functor.
* @return An iterator @p middle such that @p pred(i) is true for each
* iterator @p i in the range @p [first,middle) and false for each @p i
* in the range @p [middle,last).
- *
+ *
* Performs the same function as @p partition() with the additional
* guarantee that the relative ordering of elements in each group is
* preserved, so any two elements @p x and @p y in the range
_Predicate __pred)
{
// concept requirements
- __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
__glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
if (__first == __last)
return __first;
else
- {
- typedef typename iterator_traits<_ForwardIterator>::value_type _ValueType;
- typedef typename iterator_traits<_ForwardIterator>::difference_type _DistanceType;
-
- _Temporary_buffer<_ForwardIterator, _ValueType> __buf(__first, __last);
+ {
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ _Temporary_buffer<_ForwardIterator, _ValueType> __buf(__first,
+ __last);
if (__buf.size() > 0)
- return std::__stable_partition_adaptive(__first, __last, __pred,
- _DistanceType(__buf.requested_size()),
- __buf.begin(), __buf.size());
- else
- return std::__inplace_stable_partition(__first, __last, __pred,
- _DistanceType(__buf.requested_size()));
- }
- }
-
- /**
- * @if maint
- * This is a helper function...
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Tp>
- _RandomAccessIterator
- __unguarded_partition(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Tp __pivot)
- {
- while (true) {
- while (*__first < __pivot)
- ++__first;
- --__last;
- while (__pivot < *__last)
- --__last;
- if (!(__first < __last))
- return __first;
- std::iter_swap(__first, __last);
- ++__first;
- }
- }
-
- /**
- * @if maint
- * This is a helper function...
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Tp, typename _Compare>
- _RandomAccessIterator
- __unguarded_partition(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Tp __pivot, _Compare __comp)
- {
- while (true) {
- while (__comp(*__first, __pivot))
- ++__first;
- --__last;
- while (__comp(__pivot, *__last))
- --__last;
- if (!(__first < __last))
- return __first;
- std::iter_swap(__first, __last);
- ++__first;
- }
- }
-
-
- /**
- * @if maint
- * @doctodo
- * This controls some aspect of the sort routines.
- * @endif
- */
- enum { _S_threshold = 16 };
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Tp>
- void
- __unguarded_linear_insert(_RandomAccessIterator __last, _Tp __val)
- {
- _RandomAccessIterator __next = __last;
- --__next;
- while (__val < *__next) {
- *__last = *__next;
- __last = __next;
- --__next;
- }
- *__last = __val;
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Tp, typename _Compare>
- void
- __unguarded_linear_insert(_RandomAccessIterator __last, _Tp __val, _Compare __comp)
- {
- _RandomAccessIterator __next = __last;
- --__next;
- while (__comp(__val, *__next)) {
- *__last = *__next;
- __last = __next;
- --__next;
- }
- *__last = __val;
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator>
- void
- __insertion_sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
- {
- if (__first == __last) return;
-
- for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
- {
- typename iterator_traits<_RandomAccessIterator>::value_type __val = *__i;
- if (__val < *__first) {
- std::copy_backward(__first, __i, __i + 1);
- *__first = __val;
- }
+ return
+ std::__stable_partition_adaptive(__first, __last, __pred,
+ _DistanceType(__buf.requested_size()),
+ __buf.begin(),
+ _DistanceType(__buf.size()));
else
- std::__unguarded_linear_insert(__i, __val);
- }
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Compare>
- void
- __insertion_sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Compare __comp)
- {
- if (__first == __last) return;
-
- for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
- {
- typename iterator_traits<_RandomAccessIterator>::value_type __val = *__i;
- if (__comp(__val, *__first)) {
- std::copy_backward(__first, __i, __i + 1);
- *__first = __val;
+ return
+ std::__inplace_stable_partition(__first, __last, __pred,
+ _DistanceType(__buf.requested_size()));
}
- else
- std::__unguarded_linear_insert(__i, __val, __comp);
- }
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator>
- inline void
- __unguarded_insertion_sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
- {
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
-
- for (_RandomAccessIterator __i = __first; __i != __last; ++__i)
- std::__unguarded_linear_insert(__i, _ValueType(*__i));
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Compare>
- inline void
- __unguarded_insertion_sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Compare __comp)
- {
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
-
- for (_RandomAccessIterator __i = __first; __i != __last; ++__i)
- std::__unguarded_linear_insert(__i, _ValueType(*__i), __comp);
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator>
- void
- __final_insertion_sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
- {
- if (__last - __first > _S_threshold) {
- std::__insertion_sort(__first, __first + _S_threshold);
- std::__unguarded_insertion_sort(__first + _S_threshold, __last);
- }
- else
- std::__insertion_sort(__first, __last);
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Compare>
- void
- __final_insertion_sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Compare __comp)
- {
- if (__last - __first > _S_threshold) {
- std::__insertion_sort(__first, __first + _S_threshold, __comp);
- std::__unguarded_insertion_sort(__first + _S_threshold, __last, __comp);
- }
- else
- std::__insertion_sort(__first, __last, __comp);
- }
-
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _Size>
- inline _Size
- __lg(_Size __n)
- {
- _Size __k;
- for (__k = 0; __n != 1; __n >>= 1) ++__k;
- return __k;
}
- /**
- * @brief Sort the smallest elements of a sequence.
- * @param first An iterator.
- * @param middle Another iterator.
- * @param last Another iterator.
- * @return Nothing.
- *
- * Sorts the smallest @p (middle-first) elements in the range
- * @p [first,last) and moves them to the range @p [first,middle). The
- * order of the remaining elements in the range @p [middle,last) is
- * undefined.
- * After the sort if @p i and @j are iterators in the range
- * @p [first,middle) such that @i precedes @j and @k is an iterator in
- * the range @p [middle,last) then @p *j<*i and @p *k<*i are both false.
- */
+ /// This is a helper function for the sort routines.
template<typename _RandomAccessIterator>
void
- partial_sort(_RandomAccessIterator __first,
- _RandomAccessIterator __middle,
- _RandomAccessIterator __last)
+ __heap_select(_RandomAccessIterator __first,
+ _RandomAccessIterator __middle,
+ _RandomAccessIterator __last)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
-
- // concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
- __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
- __glibcxx_requires_valid_range(__first, __middle);
- __glibcxx_requires_valid_range(__middle, __last);
-
std::make_heap(__first, __middle);
for (_RandomAccessIterator __i = __middle; __i < __last; ++__i)
if (*__i < *__first)
- std::__pop_heap(__first, __middle, __i, _ValueType(*__i));
- std::sort_heap(__first, __middle);
+ std::__pop_heap(__first, __middle, __i);
}
- /**
- * @brief Sort the smallest elements of a sequence using a predicate
- * for comparison.
- * @param first An iterator.
- * @param middle Another iterator.
- * @param last Another iterator.
- * @param comp A comparison functor.
- * @return Nothing.
- *
- * Sorts the smallest @p (middle-first) elements in the range
- * @p [first,last) and moves them to the range @p [first,middle). The
- * order of the remaining elements in the range @p [middle,last) is
- * undefined.
- * After the sort if @p i and @j are iterators in the range
- * @p [first,middle) such that @i precedes @j and @k is an iterator in
- * the range @p [middle,last) then @p *comp(j,*i) and @p comp(*k,*i)
- * are both false.
- */
+ /// This is a helper function for the sort routines.
template<typename _RandomAccessIterator, typename _Compare>
void
- partial_sort(_RandomAccessIterator __first,
- _RandomAccessIterator __middle,
- _RandomAccessIterator __last,
- _Compare __comp)
+ __heap_select(_RandomAccessIterator __first,
+ _RandomAccessIterator __middle,
+ _RandomAccessIterator __last, _Compare __comp)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
-
- // concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- _ValueType, _ValueType>)
- __glibcxx_requires_valid_range(__first, __middle);
- __glibcxx_requires_valid_range(__middle, __last);
-
std::make_heap(__first, __middle, __comp);
for (_RandomAccessIterator __i = __middle; __i < __last; ++__i)
if (__comp(*__i, *__first))
- std::__pop_heap(__first, __middle, __i, _ValueType(*__i), __comp);
- std::sort_heap(__first, __middle, __comp);
+ std::__pop_heap(__first, __middle, __i, __comp);
}
+ // partial_sort
+
/**
* @brief Copy the smallest elements of a sequence.
+ * @ingroup sorting_algorithms
* @param first An iterator.
* @param last Another iterator.
* @param result_first A random-access iterator.
_RandomAccessIterator __result_first,
_RandomAccessIterator __result_last)
{
- typedef typename iterator_traits<_InputIterator>::value_type _InputValueType;
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _OutputValueType;
- typedef typename iterator_traits<_RandomAccessIterator>::difference_type _DistanceType;
+ typedef typename iterator_traits<_InputIterator>::value_type
+ _InputValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _OutputValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _DistanceType;
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_ConvertibleConcept<_InputValueType, _OutputValueType>)
+ __glibcxx_function_requires(_ConvertibleConcept<_InputValueType,
+ _OutputValueType>)
+ __glibcxx_function_requires(_LessThanOpConcept<_InputValueType,
+ _OutputValueType>)
__glibcxx_function_requires(_LessThanComparableConcept<_OutputValueType>)
- __glibcxx_function_requires(_LessThanComparableConcept<_InputValueType>)
__glibcxx_requires_valid_range(__first, __last);
__glibcxx_requires_valid_range(__result_first, __result_last);
- if (__result_first == __result_last) return __result_last;
+ if (__result_first == __result_last)
+ return __result_last;
_RandomAccessIterator __result_real_last = __result_first;
- while(__first != __last && __result_real_last != __result_last) {
- *__result_real_last = *__first;
- ++__result_real_last;
- ++__first;
- }
+ while(__first != __last && __result_real_last != __result_last)
+ {
+ *__result_real_last = *__first;
+ ++__result_real_last;
+ ++__first;
+ }
std::make_heap(__result_first, __result_real_last);
- while (__first != __last) {
- if (*__first < *__result_first)
- std::__adjust_heap(__result_first, _DistanceType(0),
- _DistanceType(__result_real_last - __result_first),
- _InputValueType(*__first));
- ++__first;
- }
+ while (__first != __last)
+ {
+ if (*__first < *__result_first)
+ std::__adjust_heap(__result_first, _DistanceType(0),
+ _DistanceType(__result_real_last
+ - __result_first),
+ _InputValueType(*__first));
+ ++__first;
+ }
std::sort_heap(__result_first, __result_real_last);
return __result_real_last;
}
/**
* @brief Copy the smallest elements of a sequence using a predicate for
* comparison.
+ * @ingroup sorting_algorithms
* @param first An input iterator.
* @param last Another input iterator.
* @param result_first A random-access iterator.
_RandomAccessIterator __result_last,
_Compare __comp)
{
- typedef typename iterator_traits<_InputIterator>::value_type _InputValueType;
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _OutputValueType;
- typedef typename iterator_traits<_RandomAccessIterator>::difference_type _DistanceType;
+ typedef typename iterator_traits<_InputIterator>::value_type
+ _InputValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _OutputValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _DistanceType;
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<_RandomAccessIterator>)
- __glibcxx_function_requires(_ConvertibleConcept<_InputValueType, _OutputValueType>)
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_ConvertibleConcept<_InputValueType,
+ _OutputValueType>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _InputValueType, _OutputValueType>)
__glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
_OutputValueType, _OutputValueType>)
__glibcxx_requires_valid_range(__first, __last);
__glibcxx_requires_valid_range(__result_first, __result_last);
- if (__result_first == __result_last) return __result_last;
+ if (__result_first == __result_last)
+ return __result_last;
_RandomAccessIterator __result_real_last = __result_first;
- while(__first != __last && __result_real_last != __result_last) {
- *__result_real_last = *__first;
- ++__result_real_last;
- ++__first;
- }
+ while(__first != __last && __result_real_last != __result_last)
+ {
+ *__result_real_last = *__first;
+ ++__result_real_last;
+ ++__first;
+ }
std::make_heap(__result_first, __result_real_last, __comp);
- while (__first != __last) {
- if (__comp(*__first, *__result_first))
- std::__adjust_heap(__result_first, _DistanceType(0),
- _DistanceType(__result_real_last - __result_first),
- _InputValueType(*__first),
- __comp);
- ++__first;
- }
+ while (__first != __last)
+ {
+ if (__comp(*__first, *__result_first))
+ std::__adjust_heap(__result_first, _DistanceType(0),
+ _DistanceType(__result_real_last
+ - __result_first),
+ _InputValueType(*__first),
+ __comp);
+ ++__first;
+ }
std::sort_heap(__result_first, __result_real_last, __comp);
return __result_real_last;
}
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Size>
+ /// This is a helper function for the sort routine.
+ template<typename _RandomAccessIterator>
void
- __introsort_loop(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Size __depth_limit)
+ __unguarded_linear_insert(_RandomAccessIterator __last)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
-
- while (__last - __first > _S_threshold) {
- if (__depth_limit == 0) {
- std::partial_sort(__first, __last, __last);
- return;
+ typename iterator_traits<_RandomAccessIterator>::value_type
+ __val = _GLIBCXX_MOVE(*__last);
+ _RandomAccessIterator __next = __last;
+ --__next;
+ while (__val < *__next)
+ {
+ *__last = _GLIBCXX_MOVE(*__next);
+ __last = __next;
+ --__next;
}
- --__depth_limit;
- _RandomAccessIterator __cut =
- std::__unguarded_partition(__first, __last,
- _ValueType(std::__median(*__first,
- *(__first + (__last - __first)/2),
- *(__last - 1))));
- std::__introsort_loop(__cut, __last, __depth_limit);
- __last = __cut;
- }
+ *__last = _GLIBCXX_MOVE(__val);
}
- /**
- * @if maint
- * This is a helper function for the sort routine.
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Size, typename _Compare>
+ /// This is a helper function for the sort routine.
+ template<typename _RandomAccessIterator, typename _Compare>
void
- __introsort_loop(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Size __depth_limit, _Compare __comp)
+ __unguarded_linear_insert(_RandomAccessIterator __last,
+ _Compare __comp)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
-
- while (__last - __first > _S_threshold) {
- if (__depth_limit == 0) {
- std::partial_sort(__first, __last, __last, __comp);
- return;
+ typename iterator_traits<_RandomAccessIterator>::value_type
+ __val = _GLIBCXX_MOVE(*__last);
+ _RandomAccessIterator __next = __last;
+ --__next;
+ while (__comp(__val, *__next))
+ {
+ *__last = _GLIBCXX_MOVE(*__next);
+ __last = __next;
+ --__next;
}
- --__depth_limit;
- _RandomAccessIterator __cut =
- std::__unguarded_partition(__first, __last,
- _ValueType(std::__median(*__first,
- *(__first + (__last - __first)/2),
- *(__last - 1), __comp)), __comp);
- std::__introsort_loop(__cut, __last, __depth_limit, __comp);
- __last = __cut;
- }
+ *__last = _GLIBCXX_MOVE(__val);
}
- /**
- * @brief Sort the elements of a sequence.
- * @param first An iterator.
- * @param last Another iterator.
- * @return Nothing.
- *
- * Sorts the elements in the range @p [first,last) in ascending order,
- * such that @p *(i+1)<*i is false for each iterator @p i in the range
- * @p [first,last-1).
- *
- * The relative ordering of equivalent elements is not preserved, use
- * @p stable_sort() if this is needed.
- */
+ /// This is a helper function for the sort routine.
template<typename _RandomAccessIterator>
- inline void
- sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
+ void
+ __insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
-
- // concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
- __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
- __glibcxx_requires_valid_range(__first, __last);
+ if (__first == __last)
+ return;
- if (__first != __last) {
- std::__introsort_loop(__first, __last, __lg(__last - __first) * 2);
- std::__final_insertion_sort(__first, __last);
- }
+ for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
+ {
+ if (*__i < *__first)
+ {
+ typename iterator_traits<_RandomAccessIterator>::value_type
+ __val = _GLIBCXX_MOVE(*__i);
+ _GLIBCXX_MOVE_BACKWARD3(__first, __i, __i + 1);
+ *__first = _GLIBCXX_MOVE(__val);
+ }
+ else
+ std::__unguarded_linear_insert(__i);
+ }
}
- /**
- * @brief Sort the elements of a sequence using a predicate for comparison.
- * @param first An iterator.
- * @param last Another iterator.
- * @param comp A comparison functor.
- * @return Nothing.
- *
- * Sorts the elements in the range @p [first,last) in ascending order,
- * such that @p comp(*(i+1),*i) is false for every iterator @p i in the
- * range @p [first,last-1).
- *
- * The relative ordering of equivalent elements is not preserved, use
- * @p stable_sort() if this is needed.
- */
+ /// This is a helper function for the sort routine.
template<typename _RandomAccessIterator, typename _Compare>
+ void
+ __insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Compare __comp)
+ {
+ if (__first == __last) return;
+
+ for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
+ {
+ if (__comp(*__i, *__first))
+ {
+ typename iterator_traits<_RandomAccessIterator>::value_type
+ __val = _GLIBCXX_MOVE(*__i);
+ _GLIBCXX_MOVE_BACKWARD3(__first, __i, __i + 1);
+ *__first = _GLIBCXX_MOVE(__val);
+ }
+ else
+ std::__unguarded_linear_insert(__i, __comp);
+ }
+ }
+
+ /// This is a helper function for the sort routine.
+ template<typename _RandomAccessIterator>
inline void
- sort(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp)
+ __unguarded_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
- // concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, _ValueType, _ValueType>)
- __glibcxx_requires_valid_range(__first, __last);
+ for (_RandomAccessIterator __i = __first; __i != __last; ++__i)
+ std::__unguarded_linear_insert(__i);
+ }
+
+ /// This is a helper function for the sort routine.
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline void
+ __unguarded_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
- if (__first != __last) {
- std::__introsort_loop(__first, __last, __lg(__last - __first) * 2, __comp);
- std::__final_insertion_sort(__first, __last, __comp);
- }
+ for (_RandomAccessIterator __i = __first; __i != __last; ++__i)
+ std::__unguarded_linear_insert(__i, __comp);
}
/**
- * @brief Finds the first position in which @a val could be inserted
- * without changing the ordering.
- * @param first An iterator.
- * @param last Another iterator.
- * @param val The search term.
- * @return An iterator pointing to the first element "not less than" @a val,
- * or end() if every element is less than @a val.
- * @ingroup binarysearch
+ * @doctodo
+ * This controls some aspect of the sort routines.
*/
- template<typename _ForwardIterator, typename _Tp>
- _ForwardIterator
- lower_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __val)
+ enum { _S_threshold = 16 };
+
+ /// This is a helper function for the sort routine.
+ template<typename _RandomAccessIterator>
+ void
+ __final_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last)
{
- typedef typename iterator_traits<_ForwardIterator>::value_type _ValueType;
- typedef typename iterator_traits<_ForwardIterator>::difference_type _DistanceType;
+ if (__last - __first > int(_S_threshold))
+ {
+ std::__insertion_sort(__first, __first + int(_S_threshold));
+ std::__unguarded_insertion_sort(__first + int(_S_threshold), __last);
+ }
+ else
+ std::__insertion_sort(__first, __last);
+ }
- // concept requirements
- // Note that these are slightly stricter than those of the 4-argument
- // version, defined next. The difference is in the strictness of the
- // comparison operations... so for looser checking, define your own
- // comparison function, as was intended.
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_SameTypeConcept<_Tp, _ValueType>)
- __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
- __glibcxx_requires_partitioned(__first, __last, __val);
+ /// This is a helper function for the sort routine.
+ template<typename _RandomAccessIterator, typename _Compare>
+ void
+ __final_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Compare __comp)
+ {
+ if (__last - __first > int(_S_threshold))
+ {
+ std::__insertion_sort(__first, __first + int(_S_threshold), __comp);
+ std::__unguarded_insertion_sort(__first + int(_S_threshold), __last,
+ __comp);
+ }
+ else
+ std::__insertion_sort(__first, __last, __comp);
+ }
- _DistanceType __len = std::distance(__first, __last);
- _DistanceType __half;
- _ForwardIterator __middle;
+ /// This is a helper function...
+ template<typename _RandomAccessIterator, typename _Tp>
+ _RandomAccessIterator
+ __unguarded_partition(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, const _Tp& __pivot)
+ {
+ while (true)
+ {
+ while (*__first < __pivot)
+ ++__first;
+ --__last;
+ while (__pivot < *__last)
+ --__last;
+ if (!(__first < __last))
+ return __first;
+ std::iter_swap(__first, __last);
+ ++__first;
+ }
+ }
- while (__len > 0) {
- __half = __len >> 1;
- __middle = __first;
- std::advance(__middle, __half);
- if (*__middle < __val) {
- __first = __middle;
+ /// This is a helper function...
+ template<typename _RandomAccessIterator, typename _Tp, typename _Compare>
+ _RandomAccessIterator
+ __unguarded_partition(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ const _Tp& __pivot, _Compare __comp)
+ {
+ while (true)
+ {
+ while (__comp(*__first, __pivot))
+ ++__first;
+ --__last;
+ while (__comp(__pivot, *__last))
+ --__last;
+ if (!(__first < __last))
+ return __first;
+ std::iter_swap(__first, __last);
++__first;
- __len = __len - __half - 1;
}
- else
- __len = __half;
- }
- return __first;
}
+ /// This is a helper function...
+ template<typename _RandomAccessIterator>
+ inline _RandomAccessIterator
+ __unguarded_partition_pivot(_RandomAccessIterator __first,
+ _RandomAccessIterator __last)
+ {
+ _RandomAccessIterator __mid = __first + (__last - __first) / 2;
+ std::__move_median_first(__first, __mid, (__last - 1));
+ return std::__unguarded_partition(__first + 1, __last, *__first);
+ }
+
+
+ /// This is a helper function...
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline _RandomAccessIterator
+ __unguarded_partition_pivot(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Compare __comp)
+ {
+ _RandomAccessIterator __mid = __first + (__last - __first) / 2;
+ std::__move_median_first(__first, __mid, (__last - 1), __comp);
+ return std::__unguarded_partition(__first + 1, __last, *__first, __comp);
+ }
+
+ /// This is a helper function for the sort routine.
+ template<typename _RandomAccessIterator, typename _Size>
+ void
+ __introsort_loop(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Size __depth_limit)
+ {
+ while (__last - __first > int(_S_threshold))
+ {
+ if (__depth_limit == 0)
+ {
+ _GLIBCXX_STD_P::partial_sort(__first, __last, __last);
+ return;
+ }
+ --__depth_limit;
+ _RandomAccessIterator __cut =
+ std::__unguarded_partition_pivot(__first, __last);
+ std::__introsort_loop(__cut, __last, __depth_limit);
+ __last = __cut;
+ }
+ }
+
+ /// This is a helper function for the sort routine.
+ template<typename _RandomAccessIterator, typename _Size, typename _Compare>
+ void
+ __introsort_loop(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Size __depth_limit, _Compare __comp)
+ {
+ while (__last - __first > int(_S_threshold))
+ {
+ if (__depth_limit == 0)
+ {
+ _GLIBCXX_STD_P::partial_sort(__first, __last, __last, __comp);
+ return;
+ }
+ --__depth_limit;
+ _RandomAccessIterator __cut =
+ std::__unguarded_partition_pivot(__first, __last, __comp);
+ std::__introsort_loop(__cut, __last, __depth_limit, __comp);
+ __last = __cut;
+ }
+ }
+
+ // sort
+
+ template<typename _RandomAccessIterator, typename _Size>
+ void
+ __introselect(_RandomAccessIterator __first, _RandomAccessIterator __nth,
+ _RandomAccessIterator __last, _Size __depth_limit)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ while (__last - __first > 3)
+ {
+ if (__depth_limit == 0)
+ {
+ std::__heap_select(__first, __nth + 1, __last);
+
+ // Place the nth largest element in its final position.
+ std::iter_swap(__first, __nth);
+ return;
+ }
+ --__depth_limit;
+ _RandomAccessIterator __cut =
+ std::__unguarded_partition_pivot(__first, __last);
+ if (__cut <= __nth)
+ __first = __cut;
+ else
+ __last = __cut;
+ }
+ std::__insertion_sort(__first, __last);
+ }
+
+ template<typename _RandomAccessIterator, typename _Size, typename _Compare>
+ void
+ __introselect(_RandomAccessIterator __first, _RandomAccessIterator __nth,
+ _RandomAccessIterator __last, _Size __depth_limit,
+ _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ while (__last - __first > 3)
+ {
+ if (__depth_limit == 0)
+ {
+ std::__heap_select(__first, __nth + 1, __last, __comp);
+ // Place the nth largest element in its final position.
+ std::iter_swap(__first, __nth);
+ return;
+ }
+ --__depth_limit;
+ _RandomAccessIterator __cut =
+ std::__unguarded_partition_pivot(__first, __last, __comp);
+ if (__cut <= __nth)
+ __first = __cut;
+ else
+ __last = __cut;
+ }
+ std::__insertion_sort(__first, __last, __comp);
+ }
+
+ // nth_element
+
+ // lower_bound moved to stl_algobase.h
+
/**
* @brief Finds the first position in which @a val could be inserted
* without changing the ordering.
+ * @ingroup binary_search_algorithms
* @param first An iterator.
* @param last Another iterator.
* @param val The search term.
* @param comp A functor to use for comparisons.
- * @return An iterator pointing to the first element "not less than" @a val,
- * or end() if every element is less than @a val.
- * @ingroup binarysearch
+ * @return An iterator pointing to the first element <em>not less
+ * than</em> @a val, or end() if every element is less
+ * than @a val.
+ * @ingroup binary_search_algorithms
*
* The comparison function should have the same effects on ordering as
* the function used for the initial sort.
lower_bound(_ForwardIterator __first, _ForwardIterator __last,
const _Tp& __val, _Compare __comp)
{
- typedef typename iterator_traits<_ForwardIterator>::value_type _ValueType;
- typedef typename iterator_traits<_ForwardIterator>::difference_type _DistanceType;
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, _ValueType, _Tp>)
- __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType, _Tp>)
+ __glibcxx_requires_partitioned_lower_pred(__first, __last,
+ __val, __comp);
_DistanceType __len = std::distance(__first, __last);
_DistanceType __half;
_ForwardIterator __middle;
- while (__len > 0) {
- __half = __len >> 1;
- __middle = __first;
- std::advance(__middle, __half);
- if (__comp(*__middle, __val)) {
- __first = __middle;
- ++__first;
- __len = __len - __half - 1;
+ while (__len > 0)
+ {
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (__comp(*__middle, __val))
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
+ else
+ __len = __half;
}
- else
- __len = __half;
- }
return __first;
}
/**
* @brief Finds the last position in which @a val could be inserted
* without changing the ordering.
+ * @ingroup binary_search_algorithms
* @param first An iterator.
* @param last Another iterator.
* @param val The search term.
* @return An iterator pointing to the first element greater than @a val,
* or end() if no elements are greater than @a val.
- * @ingroup binarysearch
+ * @ingroup binary_search_algorithms
*/
template<typename _ForwardIterator, typename _Tp>
_ForwardIterator
- upper_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __val)
+ upper_bound(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val)
{
- typedef typename iterator_traits<_ForwardIterator>::value_type _ValueType;
- typedef typename iterator_traits<_ForwardIterator>::difference_type _DistanceType;
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
// concept requirements
- // See comments on lower_bound.
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_SameTypeConcept<_Tp, _ValueType>)
- __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
- __glibcxx_requires_partitioned(__first, __last, __val);
+ __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>)
+ __glibcxx_requires_partitioned_upper(__first, __last, __val);
_DistanceType __len = std::distance(__first, __last);
_DistanceType __half;
_ForwardIterator __middle;
- while (__len > 0) {
- __half = __len >> 1;
- __middle = __first;
- std::advance(__middle, __half);
- if (__val < *__middle)
- __len = __half;
- else {
- __first = __middle;
- ++__first;
- __len = __len - __half - 1;
+ while (__len > 0)
+ {
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (__val < *__middle)
+ __len = __half;
+ else
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
}
- }
return __first;
}
/**
* @brief Finds the last position in which @a val could be inserted
* without changing the ordering.
+ * @ingroup binary_search_algorithms
* @param first An iterator.
* @param last Another iterator.
* @param val The search term.
* @param comp A functor to use for comparisons.
* @return An iterator pointing to the first element greater than @a val,
* or end() if no elements are greater than @a val.
- * @ingroup binarysearch
+ * @ingroup binary_search_algorithms
*
* The comparison function should have the same effects on ordering as
* the function used for the initial sort.
upper_bound(_ForwardIterator __first, _ForwardIterator __last,
const _Tp& __val, _Compare __comp)
{
- typedef typename iterator_traits<_ForwardIterator>::value_type _ValueType;
- typedef typename iterator_traits<_ForwardIterator>::difference_type _DistanceType;
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, _Tp, _ValueType>)
- __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _Tp, _ValueType>)
+ __glibcxx_requires_partitioned_upper_pred(__first, __last,
+ __val, __comp);
_DistanceType __len = std::distance(__first, __last);
_DistanceType __half;
_ForwardIterator __middle;
- while (__len > 0) {
- __half = __len >> 1;
- __middle = __first;
- std::advance(__middle, __half);
- if (__comp(__val, *__middle))
- __len = __half;
- else {
- __first = __middle;
- ++__first;
- __len = __len - __half - 1;
+ while (__len > 0)
+ {
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (__comp(__val, *__middle))
+ __len = __half;
+ else
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
}
- }
return __first;
}
/**
- * @if maint
- * This is a helper function for the merge routines.
- * @endif
+ * @brief Finds the largest subrange in which @a val could be inserted
+ * at any place in it without changing the ordering.
+ * @ingroup binary_search_algorithms
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @return An pair of iterators defining the subrange.
+ * @ingroup binary_search_algorithms
+ *
+ * This is equivalent to
+ * @code
+ * std::make_pair(lower_bound(first, last, val),
+ * upper_bound(first, last, val))
+ * @endcode
+ * but does not actually call those functions.
*/
- template<typename _BidirectionalIterator, typename _Distance>
- void
- __merge_without_buffer(_BidirectionalIterator __first,
- _BidirectionalIterator __middle,
- _BidirectionalIterator __last,
- _Distance __len1, _Distance __len2)
+ template<typename _ForwardIterator, typename _Tp>
+ pair<_ForwardIterator, _ForwardIterator>
+ equal_range(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val)
{
- if (__len1 == 0 || __len2 == 0)
- return;
- if (__len1 + __len2 == 2) {
- if (*__middle < *__first)
- std::iter_swap(__first, __middle);
- return;
- }
- _BidirectionalIterator __first_cut = __first;
- _BidirectionalIterator __second_cut = __middle;
- _Distance __len11 = 0;
- _Distance __len22 = 0;
- if (__len1 > __len2) {
- __len11 = __len1 / 2;
- std::advance(__first_cut, __len11);
- __second_cut = std::lower_bound(__middle, __last, *__first_cut);
- __len22 = std::distance(__middle, __second_cut);
- }
- else {
- __len22 = __len2 / 2;
- std::advance(__second_cut, __len22);
- __first_cut = std::upper_bound(__first, __middle, *__second_cut);
- __len11 = std::distance(__first, __first_cut);
- }
- std::rotate(__first_cut, __middle, __second_cut);
- _BidirectionalIterator __new_middle = __first_cut;
- std::advance(__new_middle, std::distance(__middle, __second_cut));
- std::__merge_without_buffer(__first, __first_cut, __new_middle,
- __len11, __len22);
- std::__merge_without_buffer(__new_middle, __second_cut, __last,
- __len1 - __len11, __len2 - __len22);
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType, _Tp>)
+ __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>)
+ __glibcxx_requires_partitioned_lower(__first, __last, __val);
+ __glibcxx_requires_partitioned_upper(__first, __last, __val);
+
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle, __left, __right;
+
+ while (__len > 0)
+ {
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (*__middle < __val)
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
+ else if (__val < *__middle)
+ __len = __half;
+ else
+ {
+ __left = std::lower_bound(__first, __middle, __val);
+ std::advance(__first, __len);
+ __right = std::upper_bound(++__middle, __first, __val);
+ return pair<_ForwardIterator, _ForwardIterator>(__left, __right);
+ }
+ }
+ return pair<_ForwardIterator, _ForwardIterator>(__first, __first);
}
/**
- * @if maint
- * This is a helper function for the merge routines.
- * @endif
+ * @brief Finds the largest subrange in which @a val could be inserted
+ * at any place in it without changing the ordering.
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @param comp A functor to use for comparisons.
+ * @return An pair of iterators defining the subrange.
+ * @ingroup binary_search_algorithms
+ *
+ * This is equivalent to
+ * @code
+ * std::make_pair(lower_bound(first, last, val, comp),
+ * upper_bound(first, last, val, comp))
+ * @endcode
+ * but does not actually call those functions.
*/
- template<typename _BidirectionalIterator, typename _Distance, typename _Compare>
- void
- __merge_without_buffer(_BidirectionalIterator __first,
- _BidirectionalIterator __middle,
- _BidirectionalIterator __last,
- _Distance __len1, _Distance __len2,
- _Compare __comp)
+ template<typename _ForwardIterator, typename _Tp, typename _Compare>
+ pair<_ForwardIterator, _ForwardIterator>
+ equal_range(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val,
+ _Compare __comp)
{
- if (__len1 == 0 || __len2 == 0)
- return;
- if (__len1 + __len2 == 2) {
- if (__comp(*__middle, *__first))
- std::iter_swap(__first, __middle);
- return;
- }
- _BidirectionalIterator __first_cut = __first;
- _BidirectionalIterator __second_cut = __middle;
- _Distance __len11 = 0;
- _Distance __len22 = 0;
- if (__len1 > __len2) {
- __len11 = __len1 / 2;
- std::advance(__first_cut, __len11);
- __second_cut = std::lower_bound(__middle, __last, *__first_cut, __comp);
- __len22 = std::distance(__middle, __second_cut);
- }
- else {
- __len22 = __len2 / 2;
- std::advance(__second_cut, __len22);
- __first_cut = std::upper_bound(__first, __middle, *__second_cut, __comp);
- __len11 = std::distance(__first, __first_cut);
- }
- std::rotate(__first_cut, __middle, __second_cut);
- _BidirectionalIterator __new_middle = __first_cut;
- std::advance(__new_middle, std::distance(__middle, __second_cut));
- std::__merge_without_buffer(__first, __first_cut, __new_middle,
- __len11, __len22, __comp);
- std::__merge_without_buffer(__new_middle, __second_cut, __last,
- __len1 - __len11, __len2 - __len22, __comp);
- }
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
- /**
- * @if maint
- * This is a helper function for the stable sorting routines.
- * @endif
- */
- template<typename _RandomAccessIterator>
- void
- __inplace_stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
- {
- if (__last - __first < 15) {
- std::__insertion_sort(__first, __last);
- return;
- }
- _RandomAccessIterator __middle = __first + (__last - __first) / 2;
- std::__inplace_stable_sort(__first, __middle);
- std::__inplace_stable_sort(__middle, __last);
- std::__merge_without_buffer(__first, __middle, __last,
- __middle - __first,
- __last - __middle);
- }
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType, _Tp>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _Tp, _ValueType>)
+ __glibcxx_requires_partitioned_lower_pred(__first, __last,
+ __val, __comp);
+ __glibcxx_requires_partitioned_upper_pred(__first, __last,
+ __val, __comp);
- /**
- * @if maint
- * This is a helper function for the stable sorting routines.
- * @endif
- */
- template<typename _RandomAccessIterator, typename _Compare>
- void
- __inplace_stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Compare __comp)
- {
- if (__last - __first < 15) {
- std::__insertion_sort(__first, __last, __comp);
- return;
- }
- _RandomAccessIterator __middle = __first + (__last - __first) / 2;
- std::__inplace_stable_sort(__first, __middle, __comp);
- std::__inplace_stable_sort(__middle, __last, __comp);
- std::__merge_without_buffer(__first, __middle, __last,
- __middle - __first,
- __last - __middle,
- __comp);
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle, __left, __right;
+
+ while (__len > 0)
+ {
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (__comp(*__middle, __val))
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
+ else if (__comp(__val, *__middle))
+ __len = __half;
+ else
+ {
+ __left = std::lower_bound(__first, __middle, __val, __comp);
+ std::advance(__first, __len);
+ __right = std::upper_bound(++__middle, __first, __val, __comp);
+ return pair<_ForwardIterator, _ForwardIterator>(__left, __right);
+ }
+ }
+ return pair<_ForwardIterator, _ForwardIterator>(__first, __first);
}
/**
- * @brief Merges two sorted ranges.
- * @param first1 An iterator.
- * @param first2 Another iterator.
- * @param last1 Another iterator.
- * @param last2 Another iterator.
- * @param result An iterator pointing to the end of the merged range.
- * @return An iterator pointing to the first element "not less than" @a val.
+ * @brief Determines whether an element exists in a range.
+ * @ingroup binary_search_algorithms
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
+ * @return True if @a val (or its equivalent) is in [@a first,@a last ].
*
- * Merges the ranges [first1,last1) and [first2,last2) into the sorted range
- * [result, result + (last1-first1) + (last2-first2)). Both input ranges
- * must be sorted, and the output range must not overlap with either of
- * the input ranges. The sort is @e stable, that is, for equivalent
- * elements in the two ranges, elements from the first range will always
- * come before elements from the second.
+ * Note that this does not actually return an iterator to @a val. For
+ * that, use std::find or a container's specialized find member functions.
*/
- template<typename _InputIterator1, typename _InputIterator2, typename _OutputIterator>
- _OutputIterator
- merge(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2,
- _OutputIterator __result)
+ template<typename _ForwardIterator, typename _Tp>
+ bool
+ binary_search(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val)
{
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator1>::value_type>)
- __glibcxx_function_requires(_SameTypeConcept<
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
- __glibcxx_function_requires(_LessThanComparableConcept<
- typename iterator_traits<_InputIterator1>::value_type>)
- __glibcxx_requires_sorted(__first1, __last1);
- __glibcxx_requires_sorted(__first2, __last2);
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanOpConcept<_Tp, _ValueType>)
+ __glibcxx_requires_partitioned_lower(__first, __last, __val);
+ __glibcxx_requires_partitioned_upper(__first, __last, __val);
- while (__first1 != __last1 && __first2 != __last2) {
- if (*__first2 < *__first1) {
- *__result = *__first2;
- ++__first2;
- }
- else {
- *__result = *__first1;
- ++__first1;
- }
- ++__result;
- }
- return std::copy(__first2, __last2, std::copy(__first1, __last1, __result));
+ _ForwardIterator __i = std::lower_bound(__first, __last, __val);
+ return __i != __last && !(__val < *__i);
}
/**
- * @brief Merges two sorted ranges.
- * @param first1 An iterator.
- * @param first2 Another iterator.
- * @param last1 Another iterator.
- * @param last2 Another iterator.
- * @param result An iterator pointing to the end of the merged range.
+ * @brief Determines whether an element exists in a range.
+ * @ingroup binary_search_algorithms
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param val The search term.
* @param comp A functor to use for comparisons.
- * @return An iterator pointing to the first element "not less than" @a val.
+ * @return True if @a val (or its equivalent) is in [@a first,@a last ].
*
- * Merges the ranges [first1,last1) and [first2,last2) into the sorted range
- * [result, result + (last1-first1) + (last2-first2)). Both input ranges
- * must be sorted, and the output range must not overlap with either of
- * the input ranges. The sort is @e stable, that is, for equivalent
- * elements in the two ranges, elements from the first range will always
- * come before elements from the second.
+ * Note that this does not actually return an iterator to @a val. For
+ * that, use std::find or a container's specialized find member functions.
*
* The comparison function should have the same effects on ordering as
* the function used for the initial sort.
*/
- template<typename _InputIterator1, typename _InputIterator2, typename _OutputIterator,
- typename _Compare>
- _OutputIterator
- merge(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2,
- _OutputIterator __result, _Compare __comp)
+ template<typename _ForwardIterator, typename _Tp, typename _Compare>
+ bool
+ binary_search(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val, _Compare __comp)
{
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_SameTypeConcept<
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator1>::value_type>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
__glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
- __glibcxx_requires_sorted_pred(__first1, __last1, __comp);
- __glibcxx_requires_sorted_pred(__first2, __last2, __comp);
-
- while (__first1 != __last1 && __first2 != __last2) {
- if (__comp(*__first2, *__first1)) {
- *__result = *__first2;
- ++__first2;
- }
- else {
- *__result = *__first1;
- ++__first1;
- }
- ++__result;
- }
- return std::copy(__first2, __last2, std::copy(__first1, __last1, __result));
- }
-
- template<typename _RandomAccessIterator1, typename _RandomAccessIterator2,
- typename _Distance>
- void
- __merge_sort_loop(_RandomAccessIterator1 __first, _RandomAccessIterator1 __last,
- _RandomAccessIterator2 __result, _Distance __step_size)
- {
- _Distance __two_step = 2 * __step_size;
-
- while (__last - __first >= __two_step) {
- __result = std::merge(__first, __first + __step_size,
- __first + __step_size, __first + __two_step,
- __result);
- __first += __two_step;
- }
-
- __step_size = std::min(_Distance(__last - __first), __step_size);
- std::merge(__first, __first + __step_size, __first + __step_size, __last,
- __result);
- }
+ _Tp, _ValueType>)
+ __glibcxx_requires_partitioned_lower_pred(__first, __last,
+ __val, __comp);
+ __glibcxx_requires_partitioned_upper_pred(__first, __last,
+ __val, __comp);
- template<typename _RandomAccessIterator1, typename _RandomAccessIterator2,
- typename _Distance, typename _Compare>
- void
- __merge_sort_loop(_RandomAccessIterator1 __first, _RandomAccessIterator1 __last,
- _RandomAccessIterator2 __result, _Distance __step_size,
- _Compare __comp)
- {
- _Distance __two_step = 2 * __step_size;
-
- while (__last - __first >= __two_step) {
- __result = std::merge(__first, __first + __step_size,
- __first + __step_size, __first + __two_step,
- __result,
- __comp);
- __first += __two_step;
- }
- __step_size = std::min(_Distance(__last - __first), __step_size);
-
- std::merge(__first, __first + __step_size,
- __first + __step_size, __last,
- __result,
- __comp);
- }
-
- enum { _S_chunk_size = 7 };
-
- template<typename _RandomAccessIterator, typename _Distance>
- void
- __chunk_insertion_sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Distance __chunk_size)
- {
- while (__last - __first >= __chunk_size) {
- std::__insertion_sort(__first, __first + __chunk_size);
- __first += __chunk_size;
- }
- std::__insertion_sort(__first, __last);
- }
-
- template<typename _RandomAccessIterator, typename _Distance, typename _Compare>
- void
- __chunk_insertion_sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Distance __chunk_size, _Compare __comp)
- {
- while (__last - __first >= __chunk_size) {
- std::__insertion_sort(__first, __first + __chunk_size, __comp);
- __first += __chunk_size;
- }
- std::__insertion_sort(__first, __last, __comp);
- }
-
- template<typename _RandomAccessIterator, typename _Pointer>
- void
- __merge_sort_with_buffer(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Pointer __buffer)
- {
- typedef typename iterator_traits<_RandomAccessIterator>::difference_type _Distance;
-
- _Distance __len = __last - __first;
- _Pointer __buffer_last = __buffer + __len;
-
- _Distance __step_size = _S_chunk_size;
- std::__chunk_insertion_sort(__first, __last, __step_size);
-
- while (__step_size < __len) {
- std::__merge_sort_loop(__first, __last, __buffer, __step_size);
- __step_size *= 2;
- std::__merge_sort_loop(__buffer, __buffer_last, __first, __step_size);
- __step_size *= 2;
- }
+ _ForwardIterator __i = std::lower_bound(__first, __last, __val, __comp);
+ return __i != __last && !bool(__comp(__val, *__i));
}
- template<typename _RandomAccessIterator, typename _Pointer, typename _Compare>
- void
- __merge_sort_with_buffer(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Pointer __buffer, _Compare __comp)
- {
- typedef typename iterator_traits<_RandomAccessIterator>::difference_type _Distance;
-
- _Distance __len = __last - __first;
- _Pointer __buffer_last = __buffer + __len;
-
- _Distance __step_size = _S_chunk_size;
- std::__chunk_insertion_sort(__first, __last, __step_size, __comp);
-
- while (__step_size < __len) {
- std::__merge_sort_loop(__first, __last, __buffer, __step_size, __comp);
- __step_size *= 2;
- std::__merge_sort_loop(__buffer, __buffer_last, __first, __step_size, __comp);
- __step_size *= 2;
- }
- }
+ // merge
- /**
- * @if maint
- * This is a helper function for the merge routines.
- * @endif
- */
+ /// This is a helper function for the merge routines.
template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
typename _BidirectionalIterator3>
_BidirectionalIterator3
- __merge_backward(_BidirectionalIterator1 __first1, _BidirectionalIterator1 __last1,
- _BidirectionalIterator2 __first2, _BidirectionalIterator2 __last2,
+ __merge_backward(_BidirectionalIterator1 __first1,
+ _BidirectionalIterator1 __last1,
+ _BidirectionalIterator2 __first2,
+ _BidirectionalIterator2 __last2,
_BidirectionalIterator3 __result)
{
if (__first1 == __last1)
return std::copy_backward(__first1, __last1, __result);
--__last1;
--__last2;
- while (true) {
- if (*__last2 < *__last1) {
- *--__result = *__last1;
- if (__first1 == __last1)
- return std::copy_backward(__first2, ++__last2, __result);
- --__last1;
- }
- else {
- *--__result = *__last2;
- if (__first2 == __last2)
- return std::copy_backward(__first1, ++__last1, __result);
- --__last2;
+ while (true)
+ {
+ if (*__last2 < *__last1)
+ {
+ *--__result = *__last1;
+ if (__first1 == __last1)
+ return std::copy_backward(__first2, ++__last2, __result);
+ --__last1;
+ }
+ else
+ {
+ *--__result = *__last2;
+ if (__first2 == __last2)
+ return std::copy_backward(__first1, ++__last1, __result);
+ --__last2;
+ }
}
- }
}
- /**
- * @if maint
- * This is a helper function for the merge routines.
- * @endif
- */
+ /// This is a helper function for the merge routines.
template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
typename _BidirectionalIterator3, typename _Compare>
_BidirectionalIterator3
- __merge_backward(_BidirectionalIterator1 __first1, _BidirectionalIterator1 __last1,
- _BidirectionalIterator2 __first2, _BidirectionalIterator2 __last2,
+ __merge_backward(_BidirectionalIterator1 __first1,
+ _BidirectionalIterator1 __last1,
+ _BidirectionalIterator2 __first2,
+ _BidirectionalIterator2 __last2,
_BidirectionalIterator3 __result,
_Compare __comp)
{
return std::copy_backward(__first1, __last1, __result);
--__last1;
--__last2;
- while (true) {
- if (__comp(*__last2, *__last1)) {
- *--__result = *__last1;
- if (__first1 == __last1)
- return std::copy_backward(__first2, ++__last2, __result);
- --__last1;
- }
- else {
- *--__result = *__last2;
- if (__first2 == __last2)
- return std::copy_backward(__first1, ++__last1, __result);
- --__last2;
+ while (true)
+ {
+ if (__comp(*__last2, *__last1))
+ {
+ *--__result = *__last1;
+ if (__first1 == __last1)
+ return std::copy_backward(__first2, ++__last2, __result);
+ --__last1;
+ }
+ else
+ {
+ *--__result = *__last2;
+ if (__first2 == __last2)
+ return std::copy_backward(__first1, ++__last1, __result);
+ --__last2;
+ }
}
- }
}
- /**
- * @if maint
- * This is a helper function for the merge routines.
- * @endif
- */
+ /// This is a helper function for the merge routines.
template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
typename _Distance>
_BidirectionalIterator1
_Distance __buffer_size)
{
_BidirectionalIterator2 __buffer_end;
- if (__len1 > __len2 && __len2 <= __buffer_size) {
- __buffer_end = std::copy(__middle, __last, __buffer);
- std::copy_backward(__first, __middle, __last);
- return std::copy(__buffer, __buffer_end, __first);
- }
- else if (__len1 <= __buffer_size) {
- __buffer_end = std::copy(__first, __middle, __buffer);
- std::copy(__middle, __last, __first);
- return std::copy_backward(__buffer, __buffer_end, __last);
- }
- else {
- std::rotate(__first, __middle, __last);
- std::advance(__first, std::distance(__middle, __last));
- return __first;
- }
+ if (__len1 > __len2 && __len2 <= __buffer_size)
+ {
+ __buffer_end = _GLIBCXX_MOVE3(__middle, __last, __buffer);
+ _GLIBCXX_MOVE_BACKWARD3(__first, __middle, __last);
+ return _GLIBCXX_MOVE3(__buffer, __buffer_end, __first);
+ }
+ else if (__len1 <= __buffer_size)
+ {
+ __buffer_end = _GLIBCXX_MOVE3(__first, __middle, __buffer);
+ _GLIBCXX_MOVE3(__middle, __last, __first);
+ return _GLIBCXX_MOVE_BACKWARD3(__buffer, __buffer_end, __last);
+ }
+ else
+ {
+ std::rotate(__first, __middle, __last);
+ std::advance(__first, std::distance(__middle, __last));
+ return __first;
+ }
}
- /**
- * @if maint
- * This is a helper function for the merge routines.
- * @endif
- */
- template<typename _BidirectionalIterator, typename _Distance, typename _Pointer>
+ /// This is a helper function for the merge routines.
+ template<typename _BidirectionalIterator, typename _Distance,
+ typename _Pointer>
void
__merge_adaptive(_BidirectionalIterator __first,
_BidirectionalIterator __middle,
_Distance __len1, _Distance __len2,
_Pointer __buffer, _Distance __buffer_size)
{
- if (__len1 <= __len2 && __len1 <= __buffer_size) {
- _Pointer __buffer_end = std::copy(__first, __middle, __buffer);
- std::merge(__buffer, __buffer_end, __middle, __last, __first);
- }
- else if (__len2 <= __buffer_size) {
- _Pointer __buffer_end = std::copy(__middle, __last, __buffer);
- std::__merge_backward(__first, __middle, __buffer, __buffer_end, __last);
- }
- else {
- _BidirectionalIterator __first_cut = __first;
- _BidirectionalIterator __second_cut = __middle;
- _Distance __len11 = 0;
- _Distance __len22 = 0;
- if (__len1 > __len2) {
- __len11 = __len1 / 2;
- std::advance(__first_cut, __len11);
- __second_cut = std::lower_bound(__middle, __last, *__first_cut);
- __len22 = std::distance(__middle, __second_cut);
+ if (__len1 <= __len2 && __len1 <= __buffer_size)
+ {
+ _Pointer __buffer_end = _GLIBCXX_MOVE3(__first, __middle, __buffer);
+ _GLIBCXX_STD_P::merge(_GLIBCXX_MAKE_MOVE_ITERATOR(__buffer),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__buffer_end),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__middle),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__last),
+ __first);
+ }
+ else if (__len2 <= __buffer_size)
+ {
+ _Pointer __buffer_end = _GLIBCXX_MOVE3(__middle, __last, __buffer);
+ std::__merge_backward(_GLIBCXX_MAKE_MOVE_ITERATOR(__first),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__middle),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__buffer),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__buffer_end),
+ __last);
+ }
+ else
+ {
+ _BidirectionalIterator __first_cut = __first;
+ _BidirectionalIterator __second_cut = __middle;
+ _Distance __len11 = 0;
+ _Distance __len22 = 0;
+ if (__len1 > __len2)
+ {
+ __len11 = __len1 / 2;
+ std::advance(__first_cut, __len11);
+ __second_cut = std::lower_bound(__middle, __last,
+ *__first_cut);
+ __len22 = std::distance(__middle, __second_cut);
}
- else {
- __len22 = __len2 / 2;
- std::advance(__second_cut, __len22);
- __first_cut = std::upper_bound(__first, __middle, *__second_cut);
- __len11 = std::distance(__first, __first_cut);
+ else
+ {
+ __len22 = __len2 / 2;
+ std::advance(__second_cut, __len22);
+ __first_cut = std::upper_bound(__first, __middle,
+ *__second_cut);
+ __len11 = std::distance(__first, __first_cut);
}
- _BidirectionalIterator __new_middle =
- std::__rotate_adaptive(__first_cut, __middle, __second_cut,
- __len1 - __len11, __len22, __buffer,
- __buffer_size);
- std::__merge_adaptive(__first, __first_cut, __new_middle, __len11,
- __len22, __buffer, __buffer_size);
- std::__merge_adaptive(__new_middle, __second_cut, __last, __len1 - __len11,
- __len2 - __len22, __buffer, __buffer_size);
- }
+ _BidirectionalIterator __new_middle =
+ std::__rotate_adaptive(__first_cut, __middle, __second_cut,
+ __len1 - __len11, __len22, __buffer,
+ __buffer_size);
+ std::__merge_adaptive(__first, __first_cut, __new_middle, __len11,
+ __len22, __buffer, __buffer_size);
+ std::__merge_adaptive(__new_middle, __second_cut, __last,
+ __len1 - __len11,
+ __len2 - __len22, __buffer, __buffer_size);
+ }
}
- /**
- * @if maint
- * This is a helper function for the merge routines.
- * @endif
- */
- template<typename _BidirectionalIterator, typename _Distance, typename _Pointer,
- typename _Compare>
+ /// This is a helper function for the merge routines.
+ template<typename _BidirectionalIterator, typename _Distance,
+ typename _Pointer, typename _Compare>
void
__merge_adaptive(_BidirectionalIterator __first,
_BidirectionalIterator __middle,
_Pointer __buffer, _Distance __buffer_size,
_Compare __comp)
{
- if (__len1 <= __len2 && __len1 <= __buffer_size) {
- _Pointer __buffer_end = std::copy(__first, __middle, __buffer);
- std::merge(__buffer, __buffer_end, __middle, __last, __first, __comp);
- }
- else if (__len2 <= __buffer_size) {
- _Pointer __buffer_end = std::copy(__middle, __last, __buffer);
- std::__merge_backward(__first, __middle, __buffer, __buffer_end, __last,
- __comp);
- }
- else {
- _BidirectionalIterator __first_cut = __first;
- _BidirectionalIterator __second_cut = __middle;
- _Distance __len11 = 0;
- _Distance __len22 = 0;
- if (__len1 > __len2) {
- __len11 = __len1 / 2;
- std::advance(__first_cut, __len11);
- __second_cut = std::lower_bound(__middle, __last, *__first_cut, __comp);
- __len22 = std::distance(__middle, __second_cut);
+ if (__len1 <= __len2 && __len1 <= __buffer_size)
+ {
+ _Pointer __buffer_end = _GLIBCXX_MOVE3(__first, __middle, __buffer);
+ _GLIBCXX_STD_P::merge(_GLIBCXX_MAKE_MOVE_ITERATOR(__buffer),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__buffer_end),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__middle),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__last),
+ __first, __comp);
+ }
+ else if (__len2 <= __buffer_size)
+ {
+ _Pointer __buffer_end = _GLIBCXX_MOVE3(__middle, __last, __buffer);
+ std::__merge_backward(_GLIBCXX_MAKE_MOVE_ITERATOR(__first),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__middle),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__buffer),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__buffer_end),
+ __last,__comp);
+ }
+ else
+ {
+ _BidirectionalIterator __first_cut = __first;
+ _BidirectionalIterator __second_cut = __middle;
+ _Distance __len11 = 0;
+ _Distance __len22 = 0;
+ if (__len1 > __len2)
+ {
+ __len11 = __len1 / 2;
+ std::advance(__first_cut, __len11);
+ __second_cut = std::lower_bound(__middle, __last, *__first_cut,
+ __comp);
+ __len22 = std::distance(__middle, __second_cut);
}
- else {
- __len22 = __len2 / 2;
- std::advance(__second_cut, __len22);
- __first_cut = std::upper_bound(__first, __middle, *__second_cut, __comp);
- __len11 = std::distance(__first, __first_cut);
+ else
+ {
+ __len22 = __len2 / 2;
+ std::advance(__second_cut, __len22);
+ __first_cut = std::upper_bound(__first, __middle, *__second_cut,
+ __comp);
+ __len11 = std::distance(__first, __first_cut);
}
- _BidirectionalIterator __new_middle =
- std::__rotate_adaptive(__first_cut, __middle, __second_cut,
- __len1 - __len11, __len22, __buffer,
- __buffer_size);
- std::__merge_adaptive(__first, __first_cut, __new_middle, __len11,
- __len22, __buffer, __buffer_size, __comp);
- std::__merge_adaptive(__new_middle, __second_cut, __last, __len1 - __len11,
- __len2 - __len22, __buffer, __buffer_size, __comp);
- }
+ _BidirectionalIterator __new_middle =
+ std::__rotate_adaptive(__first_cut, __middle, __second_cut,
+ __len1 - __len11, __len22, __buffer,
+ __buffer_size);
+ std::__merge_adaptive(__first, __first_cut, __new_middle, __len11,
+ __len22, __buffer, __buffer_size, __comp);
+ std::__merge_adaptive(__new_middle, __second_cut, __last,
+ __len1 - __len11,
+ __len2 - __len22, __buffer,
+ __buffer_size, __comp);
+ }
}
- /**
- * @brief Merges two sorted ranges in place.
- * @param first An iterator.
- * @param middle Another iterator.
- * @param last Another iterator.
- * @return Nothing.
- *
- * Merges two sorted and consecutive ranges, [first,middle) and
- * [middle,last), and puts the result in [first,last). The output will
- * be sorted. The sort is @e stable, that is, for equivalent
- * elements in the two ranges, elements from the first range will always
- * come before elements from the second.
- *
- * If enough additional memory is available, this takes (last-first)-1
- * comparisons. Otherwise an NlogN algorithm is used, where N is
- * distance(first,last).
- */
- template<typename _BidirectionalIterator>
+ /// This is a helper function for the merge routines.
+ template<typename _BidirectionalIterator, typename _Distance>
void
- inplace_merge(_BidirectionalIterator __first,
- _BidirectionalIterator __middle,
- _BidirectionalIterator __last)
+ __merge_without_buffer(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last,
+ _Distance __len1, _Distance __len2)
{
- typedef typename iterator_traits<_BidirectionalIterator>::value_type
- _ValueType;
- typedef typename iterator_traits<_BidirectionalIterator>::difference_type
- _DistanceType;
-
- // concept requirements
- __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<
- _BidirectionalIterator>)
- __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
+ if (__len1 == 0 || __len2 == 0)
+ return;
+ if (__len1 + __len2 == 2)
+ {
+ if (*__middle < *__first)
+ std::iter_swap(__first, __middle);
+ return;
+ }
+ _BidirectionalIterator __first_cut = __first;
+ _BidirectionalIterator __second_cut = __middle;
+ _Distance __len11 = 0;
+ _Distance __len22 = 0;
+ if (__len1 > __len2)
+ {
+ __len11 = __len1 / 2;
+ std::advance(__first_cut, __len11);
+ __second_cut = std::lower_bound(__middle, __last, *__first_cut);
+ __len22 = std::distance(__middle, __second_cut);
+ }
+ else
+ {
+ __len22 = __len2 / 2;
+ std::advance(__second_cut, __len22);
+ __first_cut = std::upper_bound(__first, __middle, *__second_cut);
+ __len11 = std::distance(__first, __first_cut);
+ }
+ std::rotate(__first_cut, __middle, __second_cut);
+ _BidirectionalIterator __new_middle = __first_cut;
+ std::advance(__new_middle, std::distance(__middle, __second_cut));
+ std::__merge_without_buffer(__first, __first_cut, __new_middle,
+ __len11, __len22);
+ std::__merge_without_buffer(__new_middle, __second_cut, __last,
+ __len1 - __len11, __len2 - __len22);
+ }
+
+ /// This is a helper function for the merge routines.
+ template<typename _BidirectionalIterator, typename _Distance,
+ typename _Compare>
+ void
+ __merge_without_buffer(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last,
+ _Distance __len1, _Distance __len2,
+ _Compare __comp)
+ {
+ if (__len1 == 0 || __len2 == 0)
+ return;
+ if (__len1 + __len2 == 2)
+ {
+ if (__comp(*__middle, *__first))
+ std::iter_swap(__first, __middle);
+ return;
+ }
+ _BidirectionalIterator __first_cut = __first;
+ _BidirectionalIterator __second_cut = __middle;
+ _Distance __len11 = 0;
+ _Distance __len22 = 0;
+ if (__len1 > __len2)
+ {
+ __len11 = __len1 / 2;
+ std::advance(__first_cut, __len11);
+ __second_cut = std::lower_bound(__middle, __last, *__first_cut,
+ __comp);
+ __len22 = std::distance(__middle, __second_cut);
+ }
+ else
+ {
+ __len22 = __len2 / 2;
+ std::advance(__second_cut, __len22);
+ __first_cut = std::upper_bound(__first, __middle, *__second_cut,
+ __comp);
+ __len11 = std::distance(__first, __first_cut);
+ }
+ std::rotate(__first_cut, __middle, __second_cut);
+ _BidirectionalIterator __new_middle = __first_cut;
+ std::advance(__new_middle, std::distance(__middle, __second_cut));
+ std::__merge_without_buffer(__first, __first_cut, __new_middle,
+ __len11, __len22, __comp);
+ std::__merge_without_buffer(__new_middle, __second_cut, __last,
+ __len1 - __len11, __len2 - __len22, __comp);
+ }
+
+ /**
+ * @brief Merges two sorted ranges in place.
+ * @ingroup sorting_algorithms
+ * @param first An iterator.
+ * @param middle Another iterator.
+ * @param last Another iterator.
+ * @return Nothing.
+ *
+ * Merges two sorted and consecutive ranges, [first,middle) and
+ * [middle,last), and puts the result in [first,last). The output will
+ * be sorted. The sort is @e stable, that is, for equivalent
+ * elements in the two ranges, elements from the first range will always
+ * come before elements from the second.
+ *
+ * If enough additional memory is available, this takes (last-first)-1
+ * comparisons. Otherwise an NlogN algorithm is used, where N is
+ * distance(first,last).
+ */
+ template<typename _BidirectionalIterator>
+ void
+ inplace_merge(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last)
+ {
+ typedef typename iterator_traits<_BidirectionalIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_BidirectionalIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
__glibcxx_requires_sorted(__first, __middle);
__glibcxx_requires_sorted(__middle, __last);
_DistanceType __len1 = std::distance(__first, __middle);
_DistanceType __len2 = std::distance(__middle, __last);
- _Temporary_buffer<_BidirectionalIterator, _ValueType> __buf(__first, __last);
+ _Temporary_buffer<_BidirectionalIterator, _ValueType> __buf(__first,
+ __last);
if (__buf.begin() == 0)
std::__merge_without_buffer(__first, __middle, __last, __len1, __len2);
else
/**
* @brief Merges two sorted ranges in place.
+ * @ingroup sorting_algorithms
* @param first An iterator.
* @param middle Another iterator.
* @param last Another iterator.
if (__first == __middle || __middle == __last)
return;
- _DistanceType __len1 = std::distance(__first, __middle);
- _DistanceType __len2 = std::distance(__middle, __last);
+ const _DistanceType __len1 = std::distance(__first, __middle);
+ const _DistanceType __len2 = std::distance(__middle, __last);
- _Temporary_buffer<_BidirectionalIterator, _ValueType> __buf(__first, __last);
+ _Temporary_buffer<_BidirectionalIterator, _ValueType> __buf(__first,
+ __last);
if (__buf.begin() == 0)
- std::__merge_without_buffer(__first, __middle, __last, __len1, __len2, __comp);
+ std::__merge_without_buffer(__first, __middle, __last, __len1,
+ __len2, __comp);
else
std::__merge_adaptive(__first, __middle, __last, __len1, __len2,
__buf.begin(), _DistanceType(__buf.size()),
__comp);
}
- template<typename _RandomAccessIterator, typename _Pointer, typename _Distance>
- void
- __stable_sort_adaptive(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Pointer __buffer, _Distance __buffer_size)
- {
- _Distance __len = (__last - __first + 1) / 2;
- _RandomAccessIterator __middle = __first + __len;
- if (__len > __buffer_size) {
- std::__stable_sort_adaptive(__first, __middle, __buffer, __buffer_size);
- std::__stable_sort_adaptive(__middle, __last, __buffer, __buffer_size);
- }
- else {
- std::__merge_sort_with_buffer(__first, __middle, __buffer);
- std::__merge_sort_with_buffer(__middle, __last, __buffer);
- }
- std::__merge_adaptive(__first, __middle, __last, _Distance(__middle - __first),
- _Distance(__last - __middle), __buffer, __buffer_size);
- }
-
- template<typename _RandomAccessIterator, typename _Pointer, typename _Distance,
- typename _Compare>
+ template<typename _RandomAccessIterator1, typename _RandomAccessIterator2,
+ typename _Distance>
void
- __stable_sort_adaptive(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Pointer __buffer, _Distance __buffer_size,
- _Compare __comp)
- {
- _Distance __len = (__last - __first + 1) / 2;
- _RandomAccessIterator __middle = __first + __len;
- if (__len > __buffer_size) {
- std::__stable_sort_adaptive(__first, __middle, __buffer, __buffer_size,
- __comp);
- std::__stable_sort_adaptive(__middle, __last, __buffer, __buffer_size,
- __comp);
- }
- else {
- std::__merge_sort_with_buffer(__first, __middle, __buffer, __comp);
- std::__merge_sort_with_buffer(__middle, __last, __buffer, __comp);
- }
- std::__merge_adaptive(__first, __middle, __last, _Distance(__middle - __first),
- _Distance(__last - __middle), __buffer, __buffer_size,
- __comp);
+ __merge_sort_loop(_RandomAccessIterator1 __first,
+ _RandomAccessIterator1 __last,
+ _RandomAccessIterator2 __result,
+ _Distance __step_size)
+ {
+ const _Distance __two_step = 2 * __step_size;
+
+ while (__last - __first >= __two_step)
+ {
+ __result = _GLIBCXX_STD_P::merge(
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__first),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__first + __step_size),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__first + __step_size),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__first + __two_step),
+ __result);
+ __first += __two_step;
+ }
+
+ __step_size = std::min(_Distance(__last - __first), __step_size);
+ _GLIBCXX_STD_P::merge(_GLIBCXX_MAKE_MOVE_ITERATOR(__first),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__first +
+ __step_size),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__first +
+ __step_size),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__last),
+ __result);
}
- /**
- * @brief Sort the elements of a sequence, preserving the relative order
- * of equivalent elements.
- * @param first An iterator.
- * @param last Another iterator.
- * @return Nothing.
- *
- * Sorts the elements in the range @p [first,last) in ascending order,
- * such that @p *(i+1)<*i is false for each iterator @p i in the range
- * @p [first,last-1).
- *
- * The relative ordering of equivalent elements is preserved, so any two
- * elements @p x and @p y in the range @p [first,last) such that
- * @p x<y is false and @p y<x is false will have the same relative
- * ordering after calling @p stable_sort().
- */
- template<typename _RandomAccessIterator>
- inline void
- stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
+ template<typename _RandomAccessIterator1, typename _RandomAccessIterator2,
+ typename _Distance, typename _Compare>
+ void
+ __merge_sort_loop(_RandomAccessIterator1 __first,
+ _RandomAccessIterator1 __last,
+ _RandomAccessIterator2 __result, _Distance __step_size,
+ _Compare __comp)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
- typedef typename iterator_traits<_RandomAccessIterator>::difference_type _DistanceType;
-
- // concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
- __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
- __glibcxx_requires_valid_range(__first, __last);
+ const _Distance __two_step = 2 * __step_size;
+
+ while (__last - __first >= __two_step)
+ {
+ __result = _GLIBCXX_STD_P::merge(
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__first),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__first + __step_size),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__first + __step_size),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__first + __two_step),
+ __result, __comp);
+ __first += __two_step;
+ }
+ __step_size = std::min(_Distance(__last - __first), __step_size);
- _Temporary_buffer<_RandomAccessIterator, _ValueType> buf(__first, __last);
- if (buf.begin() == 0)
- std::__inplace_stable_sort(__first, __last);
- else
- std::__stable_sort_adaptive(__first, __last, buf.begin(), _DistanceType(buf.size()));
+ _GLIBCXX_STD_P::merge(_GLIBCXX_MAKE_MOVE_ITERATOR(__first),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__first +
+ __step_size),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__first +
+ __step_size),
+ _GLIBCXX_MAKE_MOVE_ITERATOR(__last),
+ __result, __comp);
}
- /**
- * @brief Sort the elements of a sequence using a predicate for comparison,
- * preserving the relative order of equivalent elements.
- * @param first An iterator.
- * @param last Another iterator.
- * @param comp A comparison functor.
- * @return Nothing.
- *
- * Sorts the elements in the range @p [first,last) in ascending order,
- * such that @p comp(*(i+1),*i) is false for each iterator @p i in the
- * range @p [first,last-1).
- *
- * The relative ordering of equivalent elements is preserved, so any two
- * elements @p x and @p y in the range @p [first,last) such that
- * @p comp(x,y) is false and @p comp(y,x) is false will have the same
- * relative ordering after calling @p stable_sort().
- */
- template<typename _RandomAccessIterator, typename _Compare>
- inline void
- stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp)
+ template<typename _RandomAccessIterator, typename _Distance>
+ void
+ __chunk_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Distance __chunk_size)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
- typedef typename iterator_traits<_RandomAccessIterator>::difference_type _DistanceType;
-
- // concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
- _RandomAccessIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- _ValueType, _ValueType>)
- __glibcxx_requires_valid_range(__first, __last);
-
- _Temporary_buffer<_RandomAccessIterator, _ValueType> buf(__first, __last);
- if (buf.begin() == 0)
- std::__inplace_stable_sort(__first, __last, __comp);
- else
- std::__stable_sort_adaptive(__first, __last, buf.begin(), _DistanceType(buf.size()),
- __comp);
+ while (__last - __first >= __chunk_size)
+ {
+ std::__insertion_sort(__first, __first + __chunk_size);
+ __first += __chunk_size;
+ }
+ std::__insertion_sort(__first, __last);
}
- /**
- * @brief Sort a sequence just enough to find a particular position.
- * @param first An iterator.
- * @param nth Another iterator.
- * @param last Another iterator.
- * @return Nothing.
- *
- * Rearranges the elements in the range @p [first,last) so that @p *nth
- * is the same element that would have been in that position had the
- * whole sequence been sorted.
- * whole sequence been sorted. The elements either side of @p *nth are
- * not completely sorted, but for any iterator @i in the range
- * @p [first,nth) and any iterator @j in the range @p [nth,last) it
- * holds that @p *j<*i is false.
- */
- template<typename _RandomAccessIterator>
+ template<typename _RandomAccessIterator, typename _Distance,
+ typename _Compare>
void
- nth_element(_RandomAccessIterator __first,
- _RandomAccessIterator __nth,
- _RandomAccessIterator __last)
+ __chunk_insertion_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Distance __chunk_size, _Compare __comp)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
-
- // concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<_RandomAccessIterator>)
- __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
- __glibcxx_requires_valid_range(__first, __nth);
- __glibcxx_requires_valid_range(__nth, __last);
-
- while (__last - __first > 3) {
- _RandomAccessIterator __cut =
- std::__unguarded_partition(__first, __last,
- _ValueType(std::__median(*__first,
- *(__first + (__last - __first)/2),
- *(__last - 1))));
- if (__cut <= __nth)
- __first = __cut;
- else
- __last = __cut;
- }
- std::__insertion_sort(__first, __last);
+ while (__last - __first >= __chunk_size)
+ {
+ std::__insertion_sort(__first, __first + __chunk_size, __comp);
+ __first += __chunk_size;
+ }
+ std::__insertion_sort(__first, __last, __comp);
}
- /**
- * @brief Sort a sequence just enough to find a particular position
- * using a predicate for comparison.
- * @param first An iterator.
- * @param nth Another iterator.
- * @param last Another iterator.
- * @param comp A comparison functor.
- * @return Nothing.
- *
- * Rearranges the elements in the range @p [first,last) so that @p *nth
- * is the same element that would have been in that position had the
- * whole sequence been sorted. The elements either side of @p *nth are
- * not completely sorted, but for any iterator @i in the range
- * @p [first,nth) and any iterator @j in the range @p [nth,last) it
- * holds that @p comp(*j,*i) is false.
- */
- template<typename _RandomAccessIterator, typename _Compare>
+ enum { _S_chunk_size = 7 };
+
+ template<typename _RandomAccessIterator, typename _Pointer>
void
- nth_element(_RandomAccessIterator __first,
- _RandomAccessIterator __nth,
- _RandomAccessIterator __last,
- _Compare __comp)
+ __merge_sort_with_buffer(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Pointer __buffer)
{
- typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _Distance;
- // concept requirements
- __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<_RandomAccessIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- _ValueType, _ValueType>)
- __glibcxx_requires_valid_range(__first, __nth);
- __glibcxx_requires_valid_range(__nth, __last);
+ const _Distance __len = __last - __first;
+ const _Pointer __buffer_last = __buffer + __len;
- while (__last - __first > 3) {
- _RandomAccessIterator __cut =
- std::__unguarded_partition(__first, __last,
- _ValueType(std::__median(*__first,
- *(__first + (__last - __first)/2),
- *(__last - 1),
- __comp)), __comp);
- if (__cut <= __nth)
- __first = __cut;
- else
- __last = __cut;
- }
- std::__insertion_sort(__first, __last, __comp);
+ _Distance __step_size = _S_chunk_size;
+ std::__chunk_insertion_sort(__first, __last, __step_size);
+
+ while (__step_size < __len)
+ {
+ std::__merge_sort_loop(__first, __last, __buffer, __step_size);
+ __step_size *= 2;
+ std::__merge_sort_loop(__buffer, __buffer_last, __first, __step_size);
+ __step_size *= 2;
+ }
}
- /**
- * @brief Finds the largest subrange in which @a val could be inserted
- * at any place in it without changing the ordering.
- * @param first An iterator.
- * @param last Another iterator.
- * @param val The search term.
- * @return An pair of iterators defining the subrange.
- * @ingroup binarysearch
- *
- * This is equivalent to
- * @code
- * std::make_pair(lower_bound(first, last, val),
- * upper_bound(first, last, val))
- * @endcode
- * but does not actually call those functions.
- */
- template<typename _ForwardIterator, typename _Tp>
- pair<_ForwardIterator, _ForwardIterator>
- equal_range(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __val)
+ template<typename _RandomAccessIterator, typename _Pointer, typename _Compare>
+ void
+ __merge_sort_with_buffer(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Pointer __buffer, _Compare __comp)
{
- typedef typename iterator_traits<_ForwardIterator>::value_type _ValueType;
- typedef typename iterator_traits<_ForwardIterator>::difference_type _DistanceType;
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _Distance;
- // concept requirements
- // See comments on lower_bound.
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_SameTypeConcept<_Tp, _ValueType>)
- __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
- __glibcxx_requires_partitioned(__first, __last, __val);
+ const _Distance __len = __last - __first;
+ const _Pointer __buffer_last = __buffer + __len;
- _DistanceType __len = std::distance(__first, __last);
- _DistanceType __half;
- _ForwardIterator __middle, __left, __right;
+ _Distance __step_size = _S_chunk_size;
+ std::__chunk_insertion_sort(__first, __last, __step_size, __comp);
- while (__len > 0) {
- __half = __len >> 1;
- __middle = __first;
- std::advance(__middle, __half);
- if (*__middle < __val) {
- __first = __middle;
- ++__first;
- __len = __len - __half - 1;
+ while (__step_size < __len)
+ {
+ std::__merge_sort_loop(__first, __last, __buffer,
+ __step_size, __comp);
+ __step_size *= 2;
+ std::__merge_sort_loop(__buffer, __buffer_last, __first,
+ __step_size, __comp);
+ __step_size *= 2;
}
- else if (__val < *__middle)
- __len = __half;
- else {
- __left = std::lower_bound(__first, __middle, __val);
- std::advance(__first, __len);
- __right = std::upper_bound(++__middle, __first, __val);
- return pair<_ForwardIterator, _ForwardIterator>(__left, __right);
- }
- }
- return pair<_ForwardIterator, _ForwardIterator>(__first, __first);
}
- /**
- * @brief Finds the largest subrange in which @a val could be inserted
- * at any place in it without changing the ordering.
- * @param first An iterator.
- * @param last Another iterator.
- * @param val The search term.
- * @param comp A functor to use for comparisons.
- * @return An pair of iterators defining the subrange.
- * @ingroup binarysearch
- *
- * This is equivalent to
- * @code
- * std::make_pair(lower_bound(first, last, val, comp),
- * upper_bound(first, last, val, comp))
- * @endcode
- * but does not actually call those functions.
- */
- template<typename _ForwardIterator, typename _Tp, typename _Compare>
- pair<_ForwardIterator, _ForwardIterator>
- equal_range(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __val,
- _Compare __comp)
+ template<typename _RandomAccessIterator, typename _Pointer,
+ typename _Distance>
+ void
+ __stable_sort_adaptive(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Pointer __buffer, _Distance __buffer_size)
{
- typedef typename iterator_traits<_ForwardIterator>::value_type _ValueType;
- typedef typename iterator_traits<_ForwardIterator>::difference_type _DistanceType;
-
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, _ValueType, _Tp>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, _Tp, _ValueType>)
- __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
-
- _DistanceType __len = std::distance(__first, __last);
- _DistanceType __half;
- _ForwardIterator __middle, __left, __right;
-
- while (__len > 0) {
- __half = __len >> 1;
- __middle = __first;
- std::advance(__middle, __half);
- if (__comp(*__middle, __val)) {
- __first = __middle;
- ++__first;
- __len = __len - __half - 1;
+ const _Distance __len = (__last - __first + 1) / 2;
+ const _RandomAccessIterator __middle = __first + __len;
+ if (__len > __buffer_size)
+ {
+ std::__stable_sort_adaptive(__first, __middle,
+ __buffer, __buffer_size);
+ std::__stable_sort_adaptive(__middle, __last,
+ __buffer, __buffer_size);
}
- else if (__comp(__val, *__middle))
- __len = __half;
- else {
- __left = std::lower_bound(__first, __middle, __val, __comp);
- std::advance(__first, __len);
- __right = std::upper_bound(++__middle, __first, __val, __comp);
- return pair<_ForwardIterator, _ForwardIterator>(__left, __right);
+ else
+ {
+ std::__merge_sort_with_buffer(__first, __middle, __buffer);
+ std::__merge_sort_with_buffer(__middle, __last, __buffer);
}
- }
- return pair<_ForwardIterator, _ForwardIterator>(__first, __first);
+ std::__merge_adaptive(__first, __middle, __last,
+ _Distance(__middle - __first),
+ _Distance(__last - __middle),
+ __buffer, __buffer_size);
}
- /**
- * @brief Determines whether an element exists in a range.
- * @param first An iterator.
- * @param last Another iterator.
- * @param val The search term.
- * @return True if @a val (or its equivelent) is in [@a first,@a last ].
- * @ingroup binarysearch
- *
- * Note that this does not actually return an iterator to @a val. For
- * that, use std::find or a container's specialized find member functions.
- */
- template<typename _ForwardIterator, typename _Tp>
- bool
- binary_search(_ForwardIterator __first, _ForwardIterator __last,
- const _Tp& __val)
+ template<typename _RandomAccessIterator, typename _Pointer,
+ typename _Distance, typename _Compare>
+ void
+ __stable_sort_adaptive(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Pointer __buffer, _Distance __buffer_size,
+ _Compare __comp)
{
- // concept requirements
- // See comments on lower_bound.
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_SameTypeConcept<_Tp,
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
- __glibcxx_requires_partitioned(__first, __last, __val);
-
- _ForwardIterator __i = std::lower_bound(__first, __last, __val);
- return __i != __last && !(__val < *__i);
+ const _Distance __len = (__last - __first + 1) / 2;
+ const _RandomAccessIterator __middle = __first + __len;
+ if (__len > __buffer_size)
+ {
+ std::__stable_sort_adaptive(__first, __middle, __buffer,
+ __buffer_size, __comp);
+ std::__stable_sort_adaptive(__middle, __last, __buffer,
+ __buffer_size, __comp);
+ }
+ else
+ {
+ std::__merge_sort_with_buffer(__first, __middle, __buffer, __comp);
+ std::__merge_sort_with_buffer(__middle, __last, __buffer, __comp);
+ }
+ std::__merge_adaptive(__first, __middle, __last,
+ _Distance(__middle - __first),
+ _Distance(__last - __middle),
+ __buffer, __buffer_size,
+ __comp);
}
- /**
- * @brief Determines whether an element exists in a range.
- * @param first An iterator.
- * @param last Another iterator.
- * @param val The search term.
- * @param comp A functor to use for comparisons.
- * @return True if @a val (or its equivelent) is in [@a first,@a last ].
- * @ingroup binarysearch
- *
- * Note that this does not actually return an iterator to @a val. For
- * that, use std::find or a container's specialized find member functions.
- *
- * The comparison function should have the same effects on ordering as
- * the function used for the initial sort.
- */
- template<typename _ForwardIterator, typename _Tp, typename _Compare>
- bool
- binary_search(_ForwardIterator __first, _ForwardIterator __last,
- const _Tp& __val, _Compare __comp)
+ /// This is a helper function for the stable sorting routines.
+ template<typename _RandomAccessIterator>
+ void
+ __inplace_stable_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last)
{
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, _Tp,
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_partitioned_pred(__first, __last, __val, __comp);
+ if (__last - __first < 15)
+ {
+ std::__insertion_sort(__first, __last);
+ return;
+ }
+ _RandomAccessIterator __middle = __first + (__last - __first) / 2;
+ std::__inplace_stable_sort(__first, __middle);
+ std::__inplace_stable_sort(__middle, __last);
+ std::__merge_without_buffer(__first, __middle, __last,
+ __middle - __first,
+ __last - __middle);
+ }
- _ForwardIterator __i = std::lower_bound(__first, __last, __val, __comp);
- return __i != __last && !__comp(__val, *__i);
+ /// This is a helper function for the stable sorting routines.
+ template<typename _RandomAccessIterator, typename _Compare>
+ void
+ __inplace_stable_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __last, _Compare __comp)
+ {
+ if (__last - __first < 15)
+ {
+ std::__insertion_sort(__first, __last, __comp);
+ return;
+ }
+ _RandomAccessIterator __middle = __first + (__last - __first) / 2;
+ std::__inplace_stable_sort(__first, __middle, __comp);
+ std::__inplace_stable_sort(__middle, __last, __comp);
+ std::__merge_without_buffer(__first, __middle, __last,
+ __middle - __first,
+ __last - __middle,
+ __comp);
}
+ // stable_sort
+
// Set algorithms: includes, set_union, set_intersection, set_difference,
// set_symmetric_difference. All of these algorithms have the precondition
// that their input ranges are sorted and the postcondition that their output
* @param last2 End of sequence.
* @return True if each element in [first2,last2) is contained in order
* within [first1,last1). False otherwise.
- * @ingroup setoperations
+ * @ingroup set_algorithms
*
* This operation expects both [first1,last1) and [first2,last2) to be
* sorted. Searches for the presence of each element in [first2,last2)
includes(_InputIterator1 __first1, _InputIterator1 __last1,
_InputIterator2 __first2, _InputIterator2 __last2)
{
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_SameTypeConcept<
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
- __glibcxx_function_requires(_LessThanComparableConcept<
- typename iterator_traits<_InputIterator1>::value_type>)
- __glibcxx_requires_sorted(__first1, __last1);
- __glibcxx_requires_sorted(__first2, __last2);
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_set(__first1, __last1, __first2);
+ __glibcxx_requires_sorted_set(__first2, __last2, __first1);
while (__first1 != __last1 && __first2 != __last2)
if (*__first2 < *__first1)
/**
* @brief Determines whether all elements of a sequence exists in a range
* using comparison.
+ * @ingroup set_algorithms
* @param first1 Start of search range.
* @param last1 End of search range.
* @param first2 Start of sequence
* @param comp Comparison function to use.
* @return True if each element in [first2,last2) is contained in order
* within [first1,last1) according to comp. False otherwise.
- * @ingroup setoperations
+ * @ingroup set_algorithms
*
* This operation expects both [first1,last1) and [first2,last2) to be
* sorted. Searches for the presence of each element in [first2,last2)
* in [first2,last2) is not found before the search iterator reaches @a
* last2, false is returned.
*/
- template<typename _InputIterator1, typename _InputIterator2, typename _Compare>
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _Compare>
bool
includes(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2, _Compare __comp)
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _Compare __comp)
{
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_SameTypeConcept<
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
__glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
- __glibcxx_requires_sorted_pred(__first1, __last1, __comp);
- __glibcxx_requires_sorted_pred(__first2, __last2, __comp);
+ _ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp);
+ __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp);
while (__first1 != __last1 && __first2 != __last2)
if (__comp(*__first2, *__first1))
return __first2 == __last2;
}
+ // nth_element
+ // merge
+ // set_difference
+ // set_intersection
+ // set_union
+ // stable_sort
+ // set_symmetric_difference
+ // min_element
+ // max_element
+
/**
- * @brief Return the union of two sorted ranges.
- * @param first1 Start of first range.
- * @param last1 End of first range.
- * @param first2 Start of second range.
- * @param last2 End of second range.
- * @return End of the output range.
- * @ingroup setoperations
+ * @brief Permute range into the next @a dictionary ordering.
+ * @ingroup sorting_algorithms
+ * @param first Start of range.
+ * @param last End of range.
+ * @return False if wrapped to first permutation, true otherwise.
*
- * This operation iterates over both ranges, copying elements present in
- * each range in order to the output range. Iterators increment for each
- * range. When the current element of one range is less than the other,
- * that element is copied and the iterator advanced. If an element is
- * contained in both ranges, the element from the first range is copied and
- * both ranges advance. The output range may not overlap either input
- * range.
+ * Treats all permutations of the range as a set of @a dictionary sorted
+ * sequences. Permutes the current sequence into the next one of this set.
+ * Returns true if there are more sequences to generate. If the sequence
+ * is the largest of the set, the smallest is generated and false returned.
*/
- template<typename _InputIterator1, typename _InputIterator2, typename _OutputIterator>
- _OutputIterator
- set_union(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2,
- _OutputIterator __result)
+ template<typename _BidirectionalIterator>
+ bool
+ next_permutation(_BidirectionalIterator __first,
+ _BidirectionalIterator __last)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator1>::value_type>)
- __glibcxx_function_requires(_SameTypeConcept<
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
__glibcxx_function_requires(_LessThanComparableConcept<
- typename iterator_traits<_InputIterator1>::value_type>)
- __glibcxx_requires_sorted(__first1, __last1);
- __glibcxx_requires_sorted(__first2, __last2);
+ typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
- while (__first1 != __last1 && __first2 != __last2) {
- if (*__first1 < *__first2) {
- *__result = *__first1;
- ++__first1;
- }
- else if (*__first2 < *__first1) {
- *__result = *__first2;
- ++__first2;
- }
- else {
- *__result = *__first1;
- ++__first1;
- ++__first2;
+ if (__first == __last)
+ return false;
+ _BidirectionalIterator __i = __first;
+ ++__i;
+ if (__i == __last)
+ return false;
+ __i = __last;
+ --__i;
+
+ for(;;)
+ {
+ _BidirectionalIterator __ii = __i;
+ --__i;
+ if (*__i < *__ii)
+ {
+ _BidirectionalIterator __j = __last;
+ while (!(*__i < *--__j))
+ {}
+ std::iter_swap(__i, __j);
+ std::reverse(__ii, __last);
+ return true;
+ }
+ if (__i == __first)
+ {
+ std::reverse(__first, __last);
+ return false;
+ }
}
- ++__result;
- }
- return std::copy(__first2, __last2, std::copy(__first1, __last1, __result));
}
/**
- * @brief Return the union of two sorted ranges using a comparison functor.
- * @param first1 Start of first range.
- * @param last1 End of first range.
- * @param first2 Start of second range.
- * @param last2 End of second range.
- * @param comp The comparison functor.
- * @return End of the output range.
- * @ingroup setoperations
+ * @brief Permute range into the next @a dictionary ordering using
+ * comparison functor.
+ * @ingroup sorting_algorithms
+ * @param first Start of range.
+ * @param last End of range.
+ * @param comp A comparison functor.
+ * @return False if wrapped to first permutation, true otherwise.
*
- * This operation iterates over both ranges, copying elements present in
- * each range in order to the output range. Iterators increment for each
- * range. When the current element of one range is less than the other
- * according to @a comp, that element is copied and the iterator advanced.
- * If an equivalent element according to @a comp is contained in both
- * ranges, the element from the first range is copied and both ranges
- * advance. The output range may not overlap either input range.
+ * Treats all permutations of the range [first,last) as a set of
+ * @a dictionary sorted sequences ordered by @a comp. Permutes the current
+ * sequence into the next one of this set. Returns true if there are more
+ * sequences to generate. If the sequence is the largest of the set, the
+ * smallest is generated and false returned.
*/
- template<typename _InputIterator1, typename _InputIterator2, typename _OutputIterator,
- typename _Compare>
- _OutputIterator
- set_union(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2,
- _OutputIterator __result, _Compare __comp)
+ template<typename _BidirectionalIterator, typename _Compare>
+ bool
+ next_permutation(_BidirectionalIterator __first,
+ _BidirectionalIterator __last, _Compare __comp)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_SameTypeConcept<
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator1>::value_type>)
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
__glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
- __glibcxx_requires_sorted_pred(__first1, __last1, __comp);
- __glibcxx_requires_sorted_pred(__first2, __last2, __comp);
-
- while (__first1 != __last1 && __first2 != __last2) {
- if (__comp(*__first1, *__first2)) {
- *__result = *__first1;
- ++__first1;
- }
- else if (__comp(*__first2, *__first1)) {
- *__result = *__first2;
- ++__first2;
- }
- else {
- *__result = *__first1;
- ++__first1;
- ++__first2;
+ typename iterator_traits<_BidirectionalIterator>::value_type,
+ typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return false;
+ _BidirectionalIterator __i = __first;
+ ++__i;
+ if (__i == __last)
+ return false;
+ __i = __last;
+ --__i;
+
+ for(;;)
+ {
+ _BidirectionalIterator __ii = __i;
+ --__i;
+ if (__comp(*__i, *__ii))
+ {
+ _BidirectionalIterator __j = __last;
+ while (!bool(__comp(*__i, *--__j)))
+ {}
+ std::iter_swap(__i, __j);
+ std::reverse(__ii, __last);
+ return true;
+ }
+ if (__i == __first)
+ {
+ std::reverse(__first, __last);
+ return false;
+ }
}
- ++__result;
- }
- return std::copy(__first2, __last2, std::copy(__first1, __last1, __result));
}
/**
- * @brief Return the intersection of two sorted ranges.
- * @param first1 Start of first range.
- * @param last1 End of first range.
- * @param first2 Start of second range.
- * @param last2 End of second range.
- * @return End of the output range.
- * @ingroup setoperations
+ * @brief Permute range into the previous @a dictionary ordering.
+ * @ingroup sorting_algorithms
+ * @param first Start of range.
+ * @param last End of range.
+ * @return False if wrapped to last permutation, true otherwise.
*
- * This operation iterates over both ranges, copying elements present in
- * both ranges in order to the output range. Iterators increment for each
- * range. When the current element of one range is less than the other,
- * that iterator advances. If an element is contained in both ranges, the
- * element from the first range is copied and both ranges advance. The
- * output range may not overlap either input range.
+ * Treats all permutations of the range as a set of @a dictionary sorted
+ * sequences. Permutes the current sequence into the previous one of this
+ * set. Returns true if there are more sequences to generate. If the
+ * sequence is the smallest of the set, the largest is generated and false
+ * returned.
*/
- template<typename _InputIterator1, typename _InputIterator2, typename _OutputIterator>
- _OutputIterator
- set_intersection(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2,
- _OutputIterator __result)
+ template<typename _BidirectionalIterator>
+ bool
+ prev_permutation(_BidirectionalIterator __first,
+ _BidirectionalIterator __last)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator1>::value_type>)
- __glibcxx_function_requires(_SameTypeConcept<
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
__glibcxx_function_requires(_LessThanComparableConcept<
- typename iterator_traits<_InputIterator1>::value_type>)
- __glibcxx_requires_sorted(__first1, __last1);
- __glibcxx_requires_sorted(__first2, __last2);
-
- while (__first1 != __last1 && __first2 != __last2)
- if (*__first1 < *__first2)
- ++__first1;
- else if (*__first2 < *__first1)
- ++__first2;
- else {
- *__result = *__first1;
- ++__first1;
- ++__first2;
- ++__result;
- }
- return __result;
- }
+ typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
- /**
- * @brief Return the intersection of two sorted ranges using comparison
- * functor.
- * @param first1 Start of first range.
- * @param last1 End of first range.
- * @param first2 Start of second range.
- * @param last2 End of second range.
- * @param comp The comparison functor.
- * @return End of the output range.
- * @ingroup setoperations
+ if (__first == __last)
+ return false;
+ _BidirectionalIterator __i = __first;
+ ++__i;
+ if (__i == __last)
+ return false;
+ __i = __last;
+ --__i;
+
+ for(;;)
+ {
+ _BidirectionalIterator __ii = __i;
+ --__i;
+ if (*__ii < *__i)
+ {
+ _BidirectionalIterator __j = __last;
+ while (!(*--__j < *__i))
+ {}
+ std::iter_swap(__i, __j);
+ std::reverse(__ii, __last);
+ return true;
+ }
+ if (__i == __first)
+ {
+ std::reverse(__first, __last);
+ return false;
+ }
+ }
+ }
+
+ /**
+ * @brief Permute range into the previous @a dictionary ordering using
+ * comparison functor.
+ * @ingroup sorting_algorithms
+ * @param first Start of range.
+ * @param last End of range.
+ * @param comp A comparison functor.
+ * @return False if wrapped to last permutation, true otherwise.
*
- * This operation iterates over both ranges, copying elements present in
- * both ranges in order to the output range. Iterators increment for each
- * range. When the current element of one range is less than the other
- * according to @a comp, that iterator advances. If an element is
- * contained in both ranges according to @a comp, the element from the
- * first range is copied and both ranges advance. The output range may not
- * overlap either input range.
+ * Treats all permutations of the range [first,last) as a set of
+ * @a dictionary sorted sequences ordered by @a comp. Permutes the current
+ * sequence into the previous one of this set. Returns true if there are
+ * more sequences to generate. If the sequence is the smallest of the set,
+ * the largest is generated and false returned.
*/
- template<typename _InputIterator1, typename _InputIterator2, typename _OutputIterator,
- typename _Compare>
- _OutputIterator
- set_intersection(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2,
- _OutputIterator __result, _Compare __comp)
+ template<typename _BidirectionalIterator, typename _Compare>
+ bool
+ prev_permutation(_BidirectionalIterator __first,
+ _BidirectionalIterator __last, _Compare __comp)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_SameTypeConcept<
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator1>::value_type>)
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
__glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
- __glibcxx_requires_sorted_pred(__first1, __last1, __comp);
- __glibcxx_requires_sorted_pred(__first2, __last2, __comp);
+ typename iterator_traits<_BidirectionalIterator>::value_type,
+ typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
- while (__first1 != __last1 && __first2 != __last2)
- if (__comp(*__first1, *__first2))
- ++__first1;
- else if (__comp(*__first2, *__first1))
- ++__first2;
- else {
- *__result = *__first1;
- ++__first1;
- ++__first2;
- ++__result;
+ if (__first == __last)
+ return false;
+ _BidirectionalIterator __i = __first;
+ ++__i;
+ if (__i == __last)
+ return false;
+ __i = __last;
+ --__i;
+
+ for(;;)
+ {
+ _BidirectionalIterator __ii = __i;
+ --__i;
+ if (__comp(*__ii, *__i))
+ {
+ _BidirectionalIterator __j = __last;
+ while (!bool(__comp(*--__j, *__i)))
+ {}
+ std::iter_swap(__i, __j);
+ std::reverse(__ii, __last);
+ return true;
+ }
+ if (__i == __first)
+ {
+ std::reverse(__first, __last);
+ return false;
+ }
}
- return __result;
}
+ // replace
+ // replace_if
+
/**
- * @brief Return the difference of two sorted ranges.
- * @param first1 Start of first range.
- * @param last1 End of first range.
- * @param first2 Start of second range.
- * @param last2 End of second range.
- * @return End of the output range.
- * @ingroup setoperations
+ * @brief Copy a sequence, replacing each element of one value with another
+ * value.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @param old_value The value to be replaced.
+ * @param new_value The replacement value.
+ * @return The end of the output sequence, @p result+(last-first).
*
- * This operation iterates over both ranges, copying elements present in
- * the first range but not the second in order to the output range.
- * Iterators increment for each range. When the current element of the
- * first range is less than the second, that element is copied and the
- * iterator advances. If the current element of the second range is less,
- * the iterator advances, but no element is copied. If an element is
- * contained in both ranges, no elements are copied and both ranges
- * advance. The output range may not overlap either input range.
+ * Copies each element in the input range @p [first,last) to the
+ * output range @p [result,result+(last-first)) replacing elements
+ * equal to @p old_value with @p new_value.
*/
- template<typename _InputIterator1, typename _InputIterator2, typename _OutputIterator>
+ template<typename _InputIterator, typename _OutputIterator, typename _Tp>
_OutputIterator
- set_difference(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2,
- _OutputIterator __result)
+ replace_copy(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result,
+ const _Tp& __old_value, const _Tp& __new_value)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator1>::value_type>)
- __glibcxx_function_requires(_SameTypeConcept<
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
- __glibcxx_function_requires(_LessThanComparableConcept<
- typename iterator_traits<_InputIterator1>::value_type>)
- __glibcxx_requires_sorted(__first1, __last1);
- __glibcxx_requires_sorted(__first2, __last2);
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_InputIterator>::value_type, _Tp>)
+ __glibcxx_requires_valid_range(__first, __last);
- while (__first1 != __last1 && __first2 != __last2)
- if (*__first1 < *__first2) {
- *__result = *__first1;
- ++__first1;
- ++__result;
- }
- else if (*__first2 < *__first1)
- ++__first2;
- else {
- ++__first1;
- ++__first2;
- }
- return std::copy(__first1, __last1, __result);
+ for (; __first != __last; ++__first, ++__result)
+ if (*__first == __old_value)
+ *__result = __new_value;
+ else
+ *__result = *__first;
+ return __result;
}
/**
- * @brief Return the difference of two sorted ranges using comparison
- * functor.
- * @param first1 Start of first range.
- * @param last1 End of first range.
- * @param first2 Start of second range.
- * @param last2 End of second range.
- * @param comp The comparison functor.
- * @return End of the output range.
- * @ingroup setoperations
+ * @brief Copy a sequence, replacing each value for which a predicate
+ * returns true with another value.
+ * @ingroup mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @param pred A predicate.
+ * @param new_value The replacement value.
+ * @return The end of the output sequence, @p result+(last-first).
*
- * This operation iterates over both ranges, copying elements present in
- * the first range but not the second in order to the output range.
- * Iterators increment for each range. When the current element of the
- * first range is less than the second according to @a comp, that element
- * is copied and the iterator advances. If the current element of the
- * second range is less, no element is copied and the iterator advances.
- * If an element is contained in both ranges according to @a comp, no
- * elements are copied and both ranges advance. The output range may not
- * overlap either input range.
+ * Copies each element in the range @p [first,last) to the range
+ * @p [result,result+(last-first)) replacing elements for which
+ * @p pred returns true with @p new_value.
*/
- template<typename _InputIterator1, typename _InputIterator2, typename _OutputIterator,
- typename _Compare>
+ template<typename _InputIterator, typename _OutputIterator,
+ typename _Predicate, typename _Tp>
_OutputIterator
- set_difference(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2,
- _OutputIterator __result, _Compare __comp)
+ replace_copy_if(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result,
+ _Predicate __pred, const _Tp& __new_value)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_SameTypeConcept<
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator1>::value_type>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
- __glibcxx_requires_sorted_pred(__first1, __last1, __comp);
- __glibcxx_requires_sorted_pred(__first2, __last2, __comp);
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
- while (__first1 != __last1 && __first2 != __last2)
- if (__comp(*__first1, *__first2)) {
- *__result = *__first1;
- ++__first1;
- ++__result;
- }
- else if (__comp(*__first2, *__first1))
- ++__first2;
- else {
- ++__first1;
- ++__first2;
- }
- return std::copy(__first1, __last1, __result);
+ for (; __first != __last; ++__first, ++__result)
+ if (__pred(*__first))
+ *__result = __new_value;
+ else
+ *__result = *__first;
+ return __result;
}
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
/**
- * @brief Return the symmetric difference of two sorted ranges.
- * @param first1 Start of first range.
- * @param last1 End of first range.
- * @param first2 Start of second range.
- * @param last2 End of second range.
- * @return End of the output range.
- * @ingroup setoperations
- *
- * This operation iterates over both ranges, copying elements present in
- * one range but not the other in order to the output range. Iterators
- * increment for each range. When the current element of one range is less
- * than the other, that element is copied and the iterator advances. If an
- * element is contained in both ranges, no elements are copied and both
- * ranges advance. The output range may not overlap either input range.
+ * @brief Determines whether the elements of a sequence are sorted.
+ * @ingroup sorting_algorithms
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @return True if the elements are sorted, false otherwise.
*/
- template<typename _InputIterator1, typename _InputIterator2, typename _OutputIterator>
- _OutputIterator
- set_symmetric_difference(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2,
- _OutputIterator __result)
+ template<typename _ForwardIterator>
+ inline bool
+ is_sorted(_ForwardIterator __first, _ForwardIterator __last)
+ { return std::is_sorted_until(__first, __last) == __last; }
+
+ /**
+ * @brief Determines whether the elements of a sequence are sorted
+ * according to a comparison functor.
+ * @ingroup sorting_algorithms
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param comp A comparison functor.
+ * @return True if the elements are sorted, false otherwise.
+ */
+ template<typename _ForwardIterator, typename _Compare>
+ inline bool
+ is_sorted(_ForwardIterator __first, _ForwardIterator __last,
+ _Compare __comp)
+ { return std::is_sorted_until(__first, __last, __comp) == __last; }
+
+ /**
+ * @brief Determines the end of a sorted sequence.
+ * @ingroup sorting_algorithms
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @return An iterator pointing to the last iterator i in [first, last)
+ * for which the range [first, i) is sorted.
+ */
+ template<typename _ForwardIterator>
+ _ForwardIterator
+ is_sorted_until(_ForwardIterator __first, _ForwardIterator __last)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator1>::value_type>)
- __glibcxx_function_requires(_SameTypeConcept<
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
__glibcxx_function_requires(_LessThanComparableConcept<
- typename iterator_traits<_InputIterator1>::value_type>)
- __glibcxx_requires_sorted(__first1, __last1);
- __glibcxx_requires_sorted(__first2, __last2);
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
- while (__first1 != __last1 && __first2 != __last2)
- if (*__first1 < *__first2) {
- *__result = *__first1;
- ++__first1;
- ++__result;
- }
- else if (*__first2 < *__first1) {
- *__result = *__first2;
- ++__first2;
- ++__result;
- }
- else {
- ++__first1;
- ++__first2;
- }
- return std::copy(__first2, __last2, std::copy(__first1, __last1, __result));
+ if (__first == __last)
+ return __last;
+
+ _ForwardIterator __next = __first;
+ for (++__next; __next != __last; __first = __next, ++__next)
+ if (*__next < *__first)
+ return __next;
+ return __next;
}
/**
- * @brief Return the symmetric difference of two sorted ranges using
- * comparison functor.
- * @param first1 Start of first range.
- * @param last1 End of first range.
- * @param first2 Start of second range.
- * @param last2 End of second range.
- * @param comp The comparison functor.
- * @return End of the output range.
- * @ingroup setoperations
- *
- * This operation iterates over both ranges, copying elements present in
- * one range but not the other in order to the output range. Iterators
- * increment for each range. When the current element of one range is less
- * than the other according to @a comp, that element is copied and the
- * iterator advances. If an element is contained in both ranges according
- * to @a comp, no elements are copied and both ranges advance. The output
- * range may not overlap either input range.
+ * @brief Determines the end of a sorted sequence using comparison functor.
+ * @ingroup sorting_algorithms
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param comp A comparison functor.
+ * @return An iterator pointing to the last iterator i in [first, last)
+ * for which the range [first, i) is sorted.
*/
- template<typename _InputIterator1, typename _InputIterator2, typename _OutputIterator,
- typename _Compare>
- _OutputIterator
- set_symmetric_difference(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2,
- _OutputIterator __result,
- _Compare __comp)
+ template<typename _ForwardIterator, typename _Compare>
+ _ForwardIterator
+ is_sorted_until(_ForwardIterator __first, _ForwardIterator __last,
+ _Compare __comp)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_SameTypeConcept<
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator1>::value_type>)
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
__glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
- __glibcxx_requires_sorted_pred(__first1, __last1, __comp);
- __glibcxx_requires_sorted_pred(__first2, __last2, __comp);
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
- while (__first1 != __last1 && __first2 != __last2)
- if (__comp(*__first1, *__first2)) {
- *__result = *__first1;
- ++__first1;
- ++__result;
- }
- else if (__comp(*__first2, *__first1)) {
- *__result = *__first2;
- ++__first2;
- ++__result;
- }
- else {
- ++__first1;
- ++__first2;
- }
- return std::copy(__first2, __last2, std::copy(__first1, __last1, __result));
- }
+ if (__first == __last)
+ return __last;
- // min_element and max_element, with and without an explicitly supplied
- // comparison function.
+ _ForwardIterator __next = __first;
+ for (++__next; __next != __last; __first = __next, ++__next)
+ if (__comp(*__next, *__first))
+ return __next;
+ return __next;
+ }
/**
- * @brief Return the maximum element in a range.
- * @param first Start of range.
- * @param last End of range.
- * @return Iterator referencing the first instance of the largest value.
+ * @brief Determines min and max at once as an ordered pair.
+ * @ingroup sorting_algorithms
+ * @param a A thing of arbitrary type.
+ * @param b Another thing of arbitrary type.
+ * @return A pair(b, a) if b is smaller than a, pair(a, b) otherwise.
*/
- template<typename _ForwardIterator>
- _ForwardIterator
- max_element(_ForwardIterator __first, _ForwardIterator __last)
+ template<typename _Tp>
+ inline pair<const _Tp&, const _Tp&>
+ minmax(const _Tp& __a, const _Tp& __b)
{
// concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_LessThanComparableConcept<
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
+ __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
- if (__first == __last) return __first;
- _ForwardIterator __result = __first;
- while (++__first != __last)
- if (*__result < *__first)
- __result = __first;
- return __result;
+ return __b < __a ? pair<const _Tp&, const _Tp&>(__b, __a)
+ : pair<const _Tp&, const _Tp&>(__a, __b);
}
/**
- * @brief Return the maximum element in a range using comparison functor.
- * @param first Start of range.
- * @param last End of range.
- * @param comp Comparison functor.
- * @return Iterator referencing the first instance of the largest value
- * according to comp.
+ * @brief Determines min and max at once as an ordered pair.
+ * @ingroup sorting_algorithms
+ * @param a A thing of arbitrary type.
+ * @param b Another thing of arbitrary type.
+ * @param comp A @link comparison_functor comparison functor@endlink.
+ * @return A pair(b, a) if b is smaller than a, pair(a, b) otherwise.
*/
- template<typename _ForwardIterator, typename _Compare>
- _ForwardIterator
- max_element(_ForwardIterator __first, _ForwardIterator __last,
- _Compare __comp)
+ template<typename _Tp, typename _Compare>
+ inline pair<const _Tp&, const _Tp&>
+ minmax(const _Tp& __a, const _Tp& __b, _Compare __comp)
{
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- typename iterator_traits<_ForwardIterator>::value_type,
- typename iterator_traits<_ForwardIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
-
- if (__first == __last) return __first;
- _ForwardIterator __result = __first;
- while (++__first != __last)
- if (__comp(*__result, *__first)) __result = __first;
- return __result;
+ return __comp(__b, __a) ? pair<const _Tp&, const _Tp&>(__b, __a)
+ : pair<const _Tp&, const _Tp&>(__a, __b);
}
/**
- * @brief Return the minimum element in a range.
+ * @brief Return a pair of iterators pointing to the minimum and maximum
+ * elements in a range.
+ * @ingroup sorting_algorithms
* @param first Start of range.
* @param last End of range.
- * @return Iterator referencing the first instance of the smallest value.
+ * @return make_pair(m, M), where m is the first iterator i in
+ * [first, last) such that no other element in the range is
+ * smaller, and where M is the last iterator i in [first, last)
+ * such that no other element in the range is larger.
*/
template<typename _ForwardIterator>
- _ForwardIterator
- min_element(_ForwardIterator __first, _ForwardIterator __last)
+ pair<_ForwardIterator, _ForwardIterator>
+ minmax_element(_ForwardIterator __first, _ForwardIterator __last)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
- if (__first == __last) return __first;
- _ForwardIterator __result = __first;
- while (++__first != __last)
- if (*__first < *__result)
- __result = __first;
- return __result;
+ _ForwardIterator __next = __first;
+ if (__first == __last
+ || ++__next == __last)
+ return std::make_pair(__first, __first);
+
+ _ForwardIterator __min, __max;
+ if (*__next < *__first)
+ {
+ __min = __next;
+ __max = __first;
+ }
+ else
+ {
+ __min = __first;
+ __max = __next;
+ }
+
+ __first = __next;
+ ++__first;
+
+ while (__first != __last)
+ {
+ __next = __first;
+ if (++__next == __last)
+ {
+ if (*__first < *__min)
+ __min = __first;
+ else if (!(*__first < *__max))
+ __max = __first;
+ break;
+ }
+
+ if (*__next < *__first)
+ {
+ if (*__next < *__min)
+ __min = __next;
+ if (!(*__first < *__max))
+ __max = __first;
+ }
+ else
+ {
+ if (*__first < *__min)
+ __min = __first;
+ if (!(*__next < *__max))
+ __max = __next;
+ }
+
+ __first = __next;
+ ++__first;
+ }
+
+ return std::make_pair(__min, __max);
}
/**
- * @brief Return the minimum element in a range using comparison functor.
+ * @brief Return a pair of iterators pointing to the minimum and maximum
+ * elements in a range.
+ * @ingroup sorting_algorithms
* @param first Start of range.
* @param last End of range.
* @param comp Comparison functor.
- * @return Iterator referencing the first instance of the smallest value
- * according to comp.
+ * @return make_pair(m, M), where m is the first iterator i in
+ * [first, last) such that no other element in the range is
+ * smaller, and where M is the last iterator i in [first, last)
+ * such that no other element in the range is larger.
*/
template<typename _ForwardIterator, typename _Compare>
- _ForwardIterator
- min_element(_ForwardIterator __first, _ForwardIterator __last,
- _Compare __comp)
+ pair<_ForwardIterator, _ForwardIterator>
+ minmax_element(_ForwardIterator __first, _ForwardIterator __last,
+ _Compare __comp)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
- if (__first == __last) return __first;
- _ForwardIterator __result = __first;
- while (++__first != __last)
- if (__comp(*__first, *__result))
- __result = __first;
- return __result;
- }
+ _ForwardIterator __next = __first;
+ if (__first == __last
+ || ++__next == __last)
+ return std::make_pair(__first, __first);
+
+ _ForwardIterator __min, __max;
+ if (__comp(*__next, *__first))
+ {
+ __min = __next;
+ __max = __first;
+ }
+ else
+ {
+ __min = __first;
+ __max = __next;
+ }
- // next_permutation and prev_permutation, with and without an explicitly
- // supplied comparison function.
+ __first = __next;
+ ++__first;
- /**
- * @brief Permute range into the next "dictionary" ordering.
- * @param first Start of range.
- * @param last End of range.
- * @return False if wrapped to first permutation, true otherwise.
- *
- * Treats all permutations of the range as a set of "dictionary" sorted
- * sequences. Permutes the current sequence into the next one of this set.
- * Returns true if there are more sequences to generate. If the sequence
- * is the largest of the set, the smallest is generated and false returned.
- */
- template<typename _BidirectionalIterator>
- bool
- next_permutation(_BidirectionalIterator __first, _BidirectionalIterator __last)
- {
- // concept requirements
- __glibcxx_function_requires(_BidirectionalIteratorConcept<_BidirectionalIterator>)
- __glibcxx_function_requires(_LessThanComparableConcept<
- typename iterator_traits<_BidirectionalIterator>::value_type>)
- __glibcxx_requires_valid_range(__first, __last);
+ while (__first != __last)
+ {
+ __next = __first;
+ if (++__next == __last)
+ {
+ if (__comp(*__first, *__min))
+ __min = __first;
+ else if (!__comp(*__first, *__max))
+ __max = __first;
+ break;
+ }
- if (__first == __last)
- return false;
- _BidirectionalIterator __i = __first;
- ++__i;
- if (__i == __last)
- return false;
- __i = __last;
- --__i;
+ if (__comp(*__next, *__first))
+ {
+ if (__comp(*__next, *__min))
+ __min = __next;
+ if (!__comp(*__first, *__max))
+ __max = __first;
+ }
+ else
+ {
+ if (__comp(*__first, *__min))
+ __min = __first;
+ if (!__comp(*__next, *__max))
+ __max = __next;
+ }
- for(;;) {
- _BidirectionalIterator __ii = __i;
- --__i;
- if (*__i < *__ii) {
- _BidirectionalIterator __j = __last;
- while (!(*__i < *--__j))
- {}
- std::iter_swap(__i, __j);
- std::reverse(__ii, __last);
- return true;
- }
- if (__i == __first) {
- std::reverse(__first, __last);
- return false;
+ __first = __next;
+ ++__first;
}
- }
+
+ return std::make_pair(__min, __max);
+ }
+
+ // N2722 + DR 915.
+ template<typename _Tp>
+ inline _Tp
+ min(initializer_list<_Tp> __l)
+ { return *std::min_element(__l.begin(), __l.end()); }
+
+ template<typename _Tp, typename _Compare>
+ inline _Tp
+ min(initializer_list<_Tp> __l, _Compare __comp)
+ { return *std::min_element(__l.begin(), __l.end(), __comp); }
+
+ template<typename _Tp>
+ inline _Tp
+ max(initializer_list<_Tp> __l)
+ { return *std::max_element(__l.begin(), __l.end()); }
+
+ template<typename _Tp, typename _Compare>
+ inline _Tp
+ max(initializer_list<_Tp> __l, _Compare __comp)
+ { return *std::max_element(__l.begin(), __l.end(), __comp); }
+
+ template<typename _Tp>
+ inline pair<_Tp, _Tp>
+ minmax(initializer_list<_Tp> __l)
+ {
+ pair<const _Tp*, const _Tp*> __p =
+ std::minmax_element(__l.begin(), __l.end());
+ return std::make_pair(*__p.first, *__p.second);
+ }
+
+ template<typename _Tp, typename _Compare>
+ inline pair<_Tp, _Tp>
+ minmax(initializer_list<_Tp> __l, _Compare __comp)
+ {
+ pair<const _Tp*, const _Tp*> __p =
+ std::minmax_element(__l.begin(), __l.end(), __comp);
+ return std::make_pair(*__p.first, *__p.second);
}
+#ifdef _GLIBCXX_USE_C99_STDINT_TR1
/**
- * @brief Permute range into the next "dictionary" ordering using
- * comparison functor.
- * @param first Start of range.
- * @param last End of range.
- * @param comp
- * @return False if wrapped to first permutation, true otherwise.
+ * @brief Shuffle the elements of a sequence using a uniform random
+ * number generator.
+ * @ingroup mutating_algorithms
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param g A UniformRandomNumberGenerator (26.5.1.3).
+ * @return Nothing.
*
- * Treats all permutations of the range [first,last) as a set of
- * "dictionary" sorted sequences ordered by @a comp. Permutes the current
- * sequence into the next one of this set. Returns true if there are more
- * sequences to generate. If the sequence is the largest of the set, the
- * smallest is generated and false returned.
+ * Reorders the elements in the range @p [first,last) using @p g to
+ * provide random numbers.
*/
- template<typename _BidirectionalIterator, typename _Compare>
- bool
- next_permutation(_BidirectionalIterator __first, _BidirectionalIterator __last,
- _Compare __comp)
+ template<typename _RandomAccessIterator,
+ typename _UniformRandomNumberGenerator>
+ void
+ shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last,
+ _UniformRandomNumberGenerator& __g)
{
// concept requirements
- __glibcxx_function_requires(_BidirectionalIteratorConcept<_BidirectionalIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- typename iterator_traits<_BidirectionalIterator>::value_type,
- typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
__glibcxx_requires_valid_range(__first, __last);
if (__first == __last)
- return false;
- _BidirectionalIterator __i = __first;
- ++__i;
- if (__i == __last)
- return false;
- __i = __last;
- --__i;
+ return;
- for(;;) {
- _BidirectionalIterator __ii = __i;
- --__i;
- if (__comp(*__i, *__ii)) {
- _BidirectionalIterator __j = __last;
- while (!__comp(*__i, *--__j))
- {}
- std::iter_swap(__i, __j);
- std::reverse(__ii, __last);
- return true;
- }
- if (__i == __first) {
- std::reverse(__first, __last);
- return false;
- }
- }
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _DistanceType;
+
+ typedef typename std::make_unsigned<_DistanceType>::type __ud_type;
+ typedef typename std::uniform_int_distribution<__ud_type> __distr_type;
+ typedef typename __distr_type::param_type __p_type;
+ __distr_type __d;
+
+ for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
+ std::iter_swap(__i, __first + __d(__g, __p_type(0, __i - __first)));
}
+#endif
+
+#endif // __GXX_EXPERIMENTAL_CXX0X__
+
+_GLIBCXX_END_NAMESPACE
+
+_GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD_P)
/**
- * @brief Permute range into the previous "dictionary" ordering.
- * @param first Start of range.
- * @param last End of range.
- * @return False if wrapped to last permutation, true otherwise.
+ * @brief Apply a function to every element of a sequence.
+ * @ingroup non_mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param f A unary function object.
+ * @return @p f (std::move(@p f) in C++0x).
*
- * Treats all permutations of the range as a set of "dictionary" sorted
- * sequences. Permutes the current sequence into the previous one of this
- * set. Returns true if there are more sequences to generate. If the
- * sequence is the smallest of the set, the largest is generated and false
- * returned.
+ * Applies the function object @p f to each element in the range
+ * @p [first,last). @p f must not modify the order of the sequence.
+ * If @p f has a return value it is ignored.
*/
- template<typename _BidirectionalIterator>
- bool
- prev_permutation(_BidirectionalIterator __first, _BidirectionalIterator __last)
+ template<typename _InputIterator, typename _Function>
+ _Function
+ for_each(_InputIterator __first, _InputIterator __last, _Function __f)
{
// concept requirements
- __glibcxx_function_requires(_BidirectionalIteratorConcept<_BidirectionalIterator>)
- __glibcxx_function_requires(_LessThanComparableConcept<
- typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_requires_valid_range(__first, __last);
-
- if (__first == __last)
- return false;
- _BidirectionalIterator __i = __first;
- ++__i;
- if (__i == __last)
- return false;
- __i = __last;
- --__i;
-
- for(;;) {
- _BidirectionalIterator __ii = __i;
- --__i;
- if (*__ii < *__i) {
- _BidirectionalIterator __j = __last;
- while (!(*--__j < *__i))
- {}
- std::iter_swap(__i, __j);
- std::reverse(__ii, __last);
- return true;
- }
- if (__i == __first) {
- std::reverse(__first, __last);
- return false;
- }
- }
+ for (; __first != __last; ++__first)
+ __f(*__first);
+ return _GLIBCXX_MOVE(__f);
}
/**
- * @brief Permute range into the previous "dictionary" ordering using
- * comparison functor.
- * @param first Start of range.
- * @param last End of range.
- * @param comp
- * @return False if wrapped to last permutation, true otherwise.
- *
- * Treats all permutations of the range [first,last) as a set of
- * "dictionary" sorted sequences ordered by @a comp. Permutes the current
- * sequence into the previous one of this set. Returns true if there are
- * more sequences to generate. If the sequence is the smallest of the set,
- * the largest is generated and false returned.
+ * @brief Find the first occurrence of a value in a sequence.
+ * @ingroup non_mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param val The value to find.
+ * @return The first iterator @c i in the range @p [first,last)
+ * such that @c *i == @p val, or @p last if no such iterator exists.
*/
- template<typename _BidirectionalIterator, typename _Compare>
- bool
- prev_permutation(_BidirectionalIterator __first, _BidirectionalIterator __last,
- _Compare __comp)
+ template<typename _InputIterator, typename _Tp>
+ inline _InputIterator
+ find(_InputIterator __first, _InputIterator __last,
+ const _Tp& __val)
{
// concept requirements
- __glibcxx_function_requires(_BidirectionalIteratorConcept<_BidirectionalIterator>)
- __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
- typename iterator_traits<_BidirectionalIterator>::value_type,
- typename iterator_traits<_BidirectionalIterator>::value_type>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_InputIterator>::value_type, _Tp>)
__glibcxx_requires_valid_range(__first, __last);
-
- if (__first == __last)
- return false;
- _BidirectionalIterator __i = __first;
- ++__i;
- if (__i == __last)
- return false;
- __i = __last;
- --__i;
-
- for(;;) {
- _BidirectionalIterator __ii = __i;
- --__i;
- if (__comp(*__ii, *__i)) {
- _BidirectionalIterator __j = __last;
- while (!__comp(*--__j, *__i))
- {}
- std::iter_swap(__i, __j);
- std::reverse(__ii, __last);
- return true;
- }
- if (__i == __first) {
- std::reverse(__first, __last);
- return false;
- }
- }
+ return std::__find(__first, __last, __val,
+ std::__iterator_category(__first));
}
- // find_first_of, with and without an explicitly supplied comparison function.
+ /**
+ * @brief Find the first element in a sequence for which a
+ * predicate is true.
+ * @ingroup non_mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param pred A predicate.
+ * @return The first iterator @c i in the range @p [first,last)
+ * such that @p pred(*i) is true, or @p last if no such iterator exists.
+ */
+ template<typename _InputIterator, typename _Predicate>
+ inline _InputIterator
+ find_if(_InputIterator __first, _InputIterator __last,
+ _Predicate __pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+ return std::__find_if(__first, __last, __pred,
+ std::__iterator_category(__first));
+ }
/**
* @brief Find element from a set in a sequence.
+ * @ingroup non_mutating_algorithms
* @param first1 Start of range to search.
* @param last1 End of range to search.
* @param first2 Start of match candidates.
* @param last2 End of match candidates.
* @return The first iterator @c i in the range
* @p [first1,last1) such that @c *i == @p *(i2) such that i2 is an
- * interator in [first2,last2), or @p last1 if no such iterator exists.
+ * iterator in [first2,last2), or @p last1 if no such iterator exists.
*
* Searches the range @p [first1,last1) for an element that is equal to
* some element in the range [first2,last2). If found, returns an iterator
__glibcxx_requires_valid_range(__first1, __last1);
__glibcxx_requires_valid_range(__first2, __last2);
- for ( ; __first1 != __last1; ++__first1)
+ for (; __first1 != __last1; ++__first1)
for (_ForwardIterator __iter = __first2; __iter != __last2; ++__iter)
if (*__first1 == *__iter)
return __first1;
/**
* @brief Find element from a set in a sequence using a predicate.
+ * @ingroup non_mutating_algorithms
* @param first1 Start of range to search.
* @param last1 End of range to search.
* @param first2 Start of match candidates.
* @param comp Predicate to use.
* @return The first iterator @c i in the range
* @p [first1,last1) such that @c comp(*i, @p *(i2)) is true and i2 is an
- * interator in [first2,last2), or @p last1 if no such iterator exists.
+ * iterator in [first2,last2), or @p last1 if no such iterator exists.
*
- * Searches the range @p [first1,last1) for an element that is equal to
- * some element in the range [first2,last2). If found, returns an iterator in
- * the range [first1,last1), otherwise returns @p last1.
+
+ * Searches the range @p [first1,last1) for an element that is
+ * equal to some element in the range [first2,last2). If found,
+ * returns an iterator in the range [first1,last1), otherwise
+ * returns @p last1.
*/
- template<typename _InputIterator, typename _ForwardIterator, typename _BinaryPredicate>
+ template<typename _InputIterator, typename _ForwardIterator,
+ typename _BinaryPredicate>
_InputIterator
find_first_of(_InputIterator __first1, _InputIterator __last1,
_ForwardIterator __first2, _ForwardIterator __last2,
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
- __glibcxx_function_requires(_EqualOpConcept<
- typename iterator_traits<_InputIterator>::value_type,
- typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
typename iterator_traits<_InputIterator>::value_type,
typename iterator_traits<_ForwardIterator>::value_type>)
__glibcxx_requires_valid_range(__first1, __last1);
__glibcxx_requires_valid_range(__first2, __last2);
- for ( ; __first1 != __last1; ++__first1)
+ for (; __first1 != __last1; ++__first1)
for (_ForwardIterator __iter = __first2; __iter != __last2; ++__iter)
if (__comp(*__first1, *__iter))
return __first1;
return __last1;
}
-
- // find_end, with and without an explicitly supplied comparison function.
- // Search [first2, last2) as a subsequence in [first1, last1), and return
- // the *last* possible match. Note that find_end for bidirectional iterators
- // is much faster than for forward iterators.
-
- // find_end for forward iterators.
- template<typename _ForwardIterator1, typename _ForwardIterator2>
- _ForwardIterator1
- __find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
- _ForwardIterator2 __first2, _ForwardIterator2 __last2,
- forward_iterator_tag, forward_iterator_tag)
+ /**
+ * @brief Find two adjacent values in a sequence that are equal.
+ * @ingroup non_mutating_algorithms
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @return The first iterator @c i such that @c i and @c i+1 are both
+ * valid iterators in @p [first,last) and such that @c *i == @c *(i+1),
+ * or @p last if no such iterator exists.
+ */
+ template<typename _ForwardIterator>
+ _ForwardIterator
+ adjacent_find(_ForwardIterator __first, _ForwardIterator __last)
{
- if (__first2 == __last2)
- return __last1;
- else {
- _ForwardIterator1 __result = __last1;
- while (1) {
- _ForwardIterator1 __new_result
- = std::search(__first1, __last1, __first2, __last2);
- if (__new_result == __last1)
- return __result;
- else {
- __result = __new_result;
- __first1 = __new_result;
- ++__first1;
- }
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_EqualityComparableConcept<
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+ if (__first == __last)
+ return __last;
+ _ForwardIterator __next = __first;
+ while(++__next != __last)
+ {
+ if (*__first == *__next)
+ return __first;
+ __first = __next;
}
- }
+ return __last;
}
- template<typename _ForwardIterator1, typename _ForwardIterator2,
- typename _BinaryPredicate>
- _ForwardIterator1
- __find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
- _ForwardIterator2 __first2, _ForwardIterator2 __last2,
- forward_iterator_tag, forward_iterator_tag,
- _BinaryPredicate __comp)
+ /**
+ * @brief Find two adjacent values in a sequence using a predicate.
+ * @ingroup non_mutating_algorithms
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param binary_pred A binary predicate.
+ * @return The first iterator @c i such that @c i and @c i+1 are both
+ * valid iterators in @p [first,last) and such that
+ * @p binary_pred(*i,*(i+1)) is true, or @p last if no such iterator
+ * exists.
+ */
+ template<typename _ForwardIterator, typename _BinaryPredicate>
+ _ForwardIterator
+ adjacent_find(_ForwardIterator __first, _ForwardIterator __last,
+ _BinaryPredicate __binary_pred)
{
- if (__first2 == __last2)
- return __last1;
- else {
- _ForwardIterator1 __result = __last1;
- while (1) {
- _ForwardIterator1 __new_result
- = std::search(__first1, __last1, __first2, __last2, __comp);
- if (__new_result == __last1)
- return __result;
- else {
- __result = __new_result;
- __first1 = __new_result;
- ++__first1;
- }
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+ if (__first == __last)
+ return __last;
+ _ForwardIterator __next = __first;
+ while(++__next != __last)
+ {
+ if (__binary_pred(*__first, *__next))
+ return __first;
+ __first = __next;
}
- }
+ return __last;
}
- // find_end for bidirectional iterators. Requires partial specialization.
- template<typename _BidirectionalIterator1, typename _BidirectionalIterator2>
- _BidirectionalIterator1
- __find_end(_BidirectionalIterator1 __first1, _BidirectionalIterator1 __last1,
- _BidirectionalIterator2 __first2, _BidirectionalIterator2 __last2,
- bidirectional_iterator_tag, bidirectional_iterator_tag)
+ /**
+ * @brief Count the number of copies of a value in a sequence.
+ * @ingroup non_mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param value The value to be counted.
+ * @return The number of iterators @c i in the range @p [first,last)
+ * for which @c *i == @p value
+ */
+ template<typename _InputIterator, typename _Tp>
+ typename iterator_traits<_InputIterator>::difference_type
+ count(_InputIterator __first, _InputIterator __last, const _Tp& __value)
{
// concept requirements
- __glibcxx_function_requires(_BidirectionalIteratorConcept<_BidirectionalIterator1>)
- __glibcxx_function_requires(_BidirectionalIteratorConcept<_BidirectionalIterator2>)
-
- typedef reverse_iterator<_BidirectionalIterator1> _RevIterator1;
- typedef reverse_iterator<_BidirectionalIterator2> _RevIterator2;
-
- _RevIterator1 __rlast1(__first1);
- _RevIterator2 __rlast2(__first2);
- _RevIterator1 __rresult = std::search(_RevIterator1(__last1), __rlast1,
- _RevIterator2(__last2), __rlast2);
-
- if (__rresult == __rlast1)
- return __last1;
- else {
- _BidirectionalIterator1 __result = __rresult.base();
- std::advance(__result, -std::distance(__first2, __last2));
- return __result;
- }
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_InputIterator>::value_type, _Tp>)
+ __glibcxx_requires_valid_range(__first, __last);
+ typename iterator_traits<_InputIterator>::difference_type __n = 0;
+ for (; __first != __last; ++__first)
+ if (*__first == __value)
+ ++__n;
+ return __n;
}
- template<typename _BidirectionalIterator1, typename _BidirectionalIterator2,
- typename _BinaryPredicate>
- _BidirectionalIterator1
- __find_end(_BidirectionalIterator1 __first1, _BidirectionalIterator1 __last1,
- _BidirectionalIterator2 __first2, _BidirectionalIterator2 __last2,
- bidirectional_iterator_tag, bidirectional_iterator_tag,
- _BinaryPredicate __comp)
+ /**
+ * @brief Count the elements of a sequence for which a predicate is true.
+ * @ingroup non_mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param pred A predicate.
+ * @return The number of iterators @c i in the range @p [first,last)
+ * for which @p pred(*i) is true.
+ */
+ template<typename _InputIterator, typename _Predicate>
+ typename iterator_traits<_InputIterator>::difference_type
+ count_if(_InputIterator __first, _InputIterator __last, _Predicate __pred)
{
// concept requirements
- __glibcxx_function_requires(_BidirectionalIteratorConcept<_BidirectionalIterator1>)
- __glibcxx_function_requires(_BidirectionalIteratorConcept<_BidirectionalIterator2>)
-
- typedef reverse_iterator<_BidirectionalIterator1> _RevIterator1;
- typedef reverse_iterator<_BidirectionalIterator2> _RevIterator2;
-
- _RevIterator1 __rlast1(__first1);
- _RevIterator2 __rlast2(__first2);
- _RevIterator1 __rresult = std::search(_RevIterator1(__last1), __rlast1,
- _RevIterator2(__last2), __rlast2,
- __comp);
-
- if (__rresult == __rlast1)
- return __last1;
- else {
- _BidirectionalIterator1 __result = __rresult.base();
- std::advance(__result, -std::distance(__first2, __last2));
- return __result;
- }
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+ typename iterator_traits<_InputIterator>::difference_type __n = 0;
+ for (; __first != __last; ++__first)
+ if (__pred(*__first))
+ ++__n;
+ return __n;
}
- // Dispatching functions for find_end.
-
/**
- * @brief Find last matching subsequence in a sequence.
- * @param first1 Start of range to search.
- * @param last1 End of range to search.
- * @param first2 Start of sequence to match.
- * @param last2 End of sequence to match.
- * @return The last iterator @c i in the range
+ * @brief Search a sequence for a matching sub-sequence.
+ * @ingroup non_mutating_algorithms
+ * @param first1 A forward iterator.
+ * @param last1 A forward iterator.
+ * @param first2 A forward iterator.
+ * @param last2 A forward iterator.
+ * @return The first iterator @c i in the range
* @p [first1,last1-(last2-first2)) such that @c *(i+N) == @p *(first2+N)
* for each @c N in the range @p [0,last2-first2), or @p last1 if no
* such iterator exists.
* Searches the range @p [first1,last1) for a sub-sequence that compares
* equal value-by-value with the sequence given by @p [first2,last2) and
* returns an iterator to the first element of the sub-sequence, or
- * @p last1 if the sub-sequence is not found. The sub-sequence will be the
- * last such subsequence contained in [first,last1).
+ * @p last1 if the sub-sequence is not found.
*
* Because the sub-sequence must lie completely within the range
* @p [first1,last1) it must start at a position less than
* @p [first1,last1-(last2-first2))
*/
template<typename _ForwardIterator1, typename _ForwardIterator2>
- inline _ForwardIterator1
- find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
- _ForwardIterator2 __first2, _ForwardIterator2 __last2)
+ _ForwardIterator1
+ search(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
__glibcxx_requires_valid_range(__first1, __last1);
__glibcxx_requires_valid_range(__first2, __last2);
- return std::__find_end(__first1, __last1, __first2, __last2,
- std::__iterator_category(__first1),
- std::__iterator_category(__first2));
+ // Test for empty ranges
+ if (__first1 == __last1 || __first2 == __last2)
+ return __first1;
+
+ // Test for a pattern of length 1.
+ _ForwardIterator2 __p1(__first2);
+ if (++__p1 == __last2)
+ return _GLIBCXX_STD_P::find(__first1, __last1, *__first2);
+
+ // General case.
+ _ForwardIterator2 __p;
+ _ForwardIterator1 __current = __first1;
+
+ for (;;)
+ {
+ __first1 = _GLIBCXX_STD_P::find(__first1, __last1, *__first2);
+ if (__first1 == __last1)
+ return __last1;
+
+ __p = __p1;
+ __current = __first1;
+ if (++__current == __last1)
+ return __last1;
+
+ while (*__current == *__p)
+ {
+ if (++__p == __last2)
+ return __first1;
+ if (++__current == __last1)
+ return __last1;
+ }
+ ++__first1;
+ }
+ return __first1;
}
/**
- * @brief Find last matching subsequence in a sequence using a predicate.
- * @param first1 Start of range to search.
- * @param last1 End of range to search.
- * @param first2 Start of sequence to match.
- * @param last2 End of sequence to match.
- * @param comp The predicate to use.
- * @return The last iterator @c i in the range
- * @p [first1,last1-(last2-first2)) such that @c predicate(*(i+N), @p
- * (first2+N)) is true for each @c N in the range @p [0,last2-first2), or
- * @p last1 if no such iterator exists.
+ * @brief Search a sequence for a matching sub-sequence using a predicate.
+ * @ingroup non_mutating_algorithms
+ * @param first1 A forward iterator.
+ * @param last1 A forward iterator.
+ * @param first2 A forward iterator.
+ * @param last2 A forward iterator.
+ * @param predicate A binary predicate.
+ * @return The first iterator @c i in the range
+ * @p [first1,last1-(last2-first2)) such that
+ * @p predicate(*(i+N),*(first2+N)) is true for each @c N in the range
+ * @p [0,last2-first2), or @p last1 if no such iterator exists.
*
* Searches the range @p [first1,last1) for a sub-sequence that compares
- * equal value-by-value with the sequence given by @p [first2,last2) using
- * comp as a predicate and returns an iterator to the first element of the
- * sub-sequence, or @p last1 if the sub-sequence is not found. The
- * sub-sequence will be the last such subsequence contained in
- * [first,last1).
+ * equal value-by-value with the sequence given by @p [first2,last2),
+ * using @p predicate to determine equality, and returns an iterator
+ * to the first element of the sub-sequence, or @p last1 if no such
+ * iterator exists.
*
- * Because the sub-sequence must lie completely within the range
- * @p [first1,last1) it must start at a position less than
- * @p last1-(last2-first2) where @p last2-first2 is the length of the
- * sub-sequence.
- * This means that the returned iterator @c i will be in the range
- * @p [first1,last1-(last2-first2))
+ * @see search(_ForwardIter1, _ForwardIter1, _ForwardIter2, _ForwardIter2)
*/
template<typename _ForwardIterator1, typename _ForwardIterator2,
typename _BinaryPredicate>
- inline _ForwardIterator1
- find_end(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
- _ForwardIterator2 __first2, _ForwardIterator2 __last2,
- _BinaryPredicate __comp)
+ _ForwardIterator1
+ search(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2, _ForwardIterator2 __last2,
+ _BinaryPredicate __predicate)
{
// concept requirements
__glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
__glibcxx_requires_valid_range(__first1, __last1);
__glibcxx_requires_valid_range(__first2, __last2);
- return std::__find_end(__first1, __last1, __first2, __last2,
- std::__iterator_category(__first1),
- std::__iterator_category(__first2),
- __comp);
+ // Test for empty ranges
+ if (__first1 == __last1 || __first2 == __last2)
+ return __first1;
+
+ // Test for a pattern of length 1.
+ _ForwardIterator2 __p1(__first2);
+ if (++__p1 == __last2)
+ {
+ while (__first1 != __last1
+ && !bool(__predicate(*__first1, *__first2)))
+ ++__first1;
+ return __first1;
+ }
+
+ // General case.
+ _ForwardIterator2 __p;
+ _ForwardIterator1 __current = __first1;
+
+ for (;;)
+ {
+ while (__first1 != __last1
+ && !bool(__predicate(*__first1, *__first2)))
+ ++__first1;
+ if (__first1 == __last1)
+ return __last1;
+
+ __p = __p1;
+ __current = __first1;
+ if (++__current == __last1)
+ return __last1;
+
+ while (__predicate(*__current, *__p))
+ {
+ if (++__p == __last2)
+ return __first1;
+ if (++__current == __last1)
+ return __last1;
+ }
+ ++__first1;
+ }
+ return __first1;
+ }
+
+
+ /**
+ * @brief Search a sequence for a number of consecutive values.
+ * @ingroup non_mutating_algorithms
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param count The number of consecutive values.
+ * @param val The value to find.
+ * @return The first iterator @c i in the range @p [first,last-count)
+ * such that @c *(i+N) == @p val for each @c N in the range @p [0,count),
+ * or @p last if no such iterator exists.
+ *
+ * Searches the range @p [first,last) for @p count consecutive elements
+ * equal to @p val.
+ */
+ template<typename _ForwardIterator, typename _Integer, typename _Tp>
+ _ForwardIterator
+ search_n(_ForwardIterator __first, _ForwardIterator __last,
+ _Integer __count, const _Tp& __val)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__count <= 0)
+ return __first;
+ if (__count == 1)
+ return _GLIBCXX_STD_P::find(__first, __last, __val);
+ return std::__search_n(__first, __last, __count, __val,
+ std::__iterator_category(__first));
+ }
+
+
+ /**
+ * @brief Search a sequence for a number of consecutive values using a
+ * predicate.
+ * @ingroup non_mutating_algorithms
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param count The number of consecutive values.
+ * @param val The value to find.
+ * @param binary_pred A binary predicate.
+ * @return The first iterator @c i in the range @p [first,last-count)
+ * such that @p binary_pred(*(i+N),val) is true for each @c N in the
+ * range @p [0,count), or @p last if no such iterator exists.
+ *
+ * Searches the range @p [first,last) for @p count consecutive elements
+ * for which the predicate returns true.
+ */
+ template<typename _ForwardIterator, typename _Integer, typename _Tp,
+ typename _BinaryPredicate>
+ _ForwardIterator
+ search_n(_ForwardIterator __first, _ForwardIterator __last,
+ _Integer __count, const _Tp& __val,
+ _BinaryPredicate __binary_pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_BinaryPredicate,
+ typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__count <= 0)
+ return __first;
+ if (__count == 1)
+ {
+ while (__first != __last && !bool(__binary_pred(*__first, __val)))
+ ++__first;
+ return __first;
+ }
+ return std::__search_n(__first, __last, __count, __val, __binary_pred,
+ std::__iterator_category(__first));
+ }
+
+
+ /**
+ * @brief Perform an operation on a sequence.
+ * @ingroup mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @param unary_op A unary operator.
+ * @return An output iterator equal to @p result+(last-first).
+ *
+ * Applies the operator to each element in the input range and assigns
+ * the results to successive elements of the output sequence.
+ * Evaluates @p *(result+N)=unary_op(*(first+N)) for each @c N in the
+ * range @p [0,last-first).
+ *
+ * @p unary_op must not alter its argument.
+ */
+ template<typename _InputIterator, typename _OutputIterator,
+ typename _UnaryOperation>
+ _OutputIterator
+ transform(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result, _UnaryOperation __unary_op)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ // "the type returned by a _UnaryOperation"
+ __typeof__(__unary_op(*__first))>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for (; __first != __last; ++__first, ++__result)
+ *__result = __unary_op(*__first);
+ return __result;
+ }
+
+ /**
+ * @brief Perform an operation on corresponding elements of two sequences.
+ * @ingroup mutating_algorithms
+ * @param first1 An input iterator.
+ * @param last1 An input iterator.
+ * @param first2 An input iterator.
+ * @param result An output iterator.
+ * @param binary_op A binary operator.
+ * @return An output iterator equal to @p result+(last-first).
+ *
+ * Applies the operator to the corresponding elements in the two
+ * input ranges and assigns the results to successive elements of the
+ * output sequence.
+ * Evaluates @p *(result+N)=binary_op(*(first1+N),*(first2+N)) for each
+ * @c N in the range @p [0,last1-first1).
+ *
+ * @p binary_op must not alter either of its arguments.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator, typename _BinaryOperation>
+ _OutputIterator
+ transform(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _OutputIterator __result,
+ _BinaryOperation __binary_op)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ // "the type returned by a _BinaryOperation"
+ __typeof__(__binary_op(*__first1,*__first2))>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+
+ for (; __first1 != __last1; ++__first1, ++__first2, ++__result)
+ *__result = __binary_op(*__first1, *__first2);
+ return __result;
+ }
+
+ /**
+ * @brief Replace each occurrence of one value in a sequence with another
+ * value.
+ * @ingroup mutating_algorithms
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param old_value The value to be replaced.
+ * @param new_value The replacement value.
+ * @return replace() returns no value.
+ *
+ * For each iterator @c i in the range @p [first,last) if @c *i ==
+ * @p old_value then the assignment @c *i = @p new_value is performed.
+ */
+ template<typename _ForwardIterator, typename _Tp>
+ void
+ replace(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __old_value, const _Tp& __new_value)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
+ __glibcxx_function_requires(_ConvertibleConcept<_Tp,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for (; __first != __last; ++__first)
+ if (*__first == __old_value)
+ *__first = __new_value;
+ }
+
+ /**
+ * @brief Replace each value in a sequence for which a predicate returns
+ * true with another value.
+ * @ingroup mutating_algorithms
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param pred A predicate.
+ * @param new_value The replacement value.
+ * @return replace_if() returns no value.
+ *
+ * For each iterator @c i in the range @p [first,last) if @p pred(*i)
+ * is true then the assignment @c *i = @p new_value is performed.
+ */
+ template<typename _ForwardIterator, typename _Predicate, typename _Tp>
+ void
+ replace_if(_ForwardIterator __first, _ForwardIterator __last,
+ _Predicate __pred, const _Tp& __new_value)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_ConvertibleConcept<_Tp,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for (; __first != __last; ++__first)
+ if (__pred(*__first))
+ *__first = __new_value;
+ }
+
+ /**
+ * @brief Assign the result of a function object to each value in a
+ * sequence.
+ * @ingroup mutating_algorithms
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param gen A function object taking no arguments and returning
+ * std::iterator_traits<_ForwardIterator>::value_type
+ * @return generate() returns no value.
+ *
+ * Performs the assignment @c *i = @p gen() for each @c i in the range
+ * @p [first,last).
+ */
+ template<typename _ForwardIterator, typename _Generator>
+ void
+ generate(_ForwardIterator __first, _ForwardIterator __last,
+ _Generator __gen)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_GeneratorConcept<_Generator,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ for (; __first != __last; ++__first)
+ *__first = __gen();
}
-} // namespace std
+ /**
+ * @brief Assign the result of a function object to each value in a
+ * sequence.
+ * @ingroup mutating_algorithms
+ * @param first A forward iterator.
+ * @param n The length of the sequence.
+ * @param gen A function object taking no arguments and returning
+ * std::iterator_traits<_ForwardIterator>::value_type
+ * @return The end of the sequence, @p first+n
+ *
+ * Performs the assignment @c *i = @p gen() for each @c i in the range
+ * @p [first,first+n).
+ *
+ * _GLIBCXX_RESOLVE_LIB_DEFECTS
+ * DR 865. More algorithms that throw away information
+ */
+ template<typename _OutputIterator, typename _Size, typename _Generator>
+ _OutputIterator
+ generate_n(_OutputIterator __first, _Size __n, _Generator __gen)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ // "the type returned by a _Generator"
+ __typeof__(__gen())>)
+
+ for (__decltype(__n + 0) __niter = __n;
+ __niter > 0; --__niter, ++__first)
+ *__first = __gen();
+ return __first;
+ }
+
+
+ /**
+ * @brief Copy a sequence, removing consecutive duplicate values.
+ * @ingroup mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * Copies each element in the range @p [first,last) to the range
+ * beginning at @p result, except that only the first element is copied
+ * from groups of consecutive elements that compare equal.
+ * unique_copy() is stable, so the relative order of elements that are
+ * copied is unchanged.
+ *
+ * _GLIBCXX_RESOLVE_LIB_DEFECTS
+ * DR 241. Does unique_copy() require CopyConstructible and Assignable?
+ *
+ * _GLIBCXX_RESOLVE_LIB_DEFECTS
+ * DR 538. 241 again: Does unique_copy() require CopyConstructible and
+ * Assignable?
+ */
+ template<typename _InputIterator, typename _OutputIterator>
+ inline _OutputIterator
+ unique_copy(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_EqualityComparableConcept<
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return __result;
+ return std::__unique_copy(__first, __last, __result,
+ std::__iterator_category(__first),
+ std::__iterator_category(__result));
+ }
+
+ /**
+ * @brief Copy a sequence, removing consecutive values using a predicate.
+ * @ingroup mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @param binary_pred A binary predicate.
+ * @return An iterator designating the end of the resulting sequence.
+ *
+ * Copies each element in the range @p [first,last) to the range
+ * beginning at @p result, except that only the first element is copied
+ * from groups of consecutive elements for which @p binary_pred returns
+ * true.
+ * unique_copy() is stable, so the relative order of elements that are
+ * copied is unchanged.
+ *
+ * _GLIBCXX_RESOLVE_LIB_DEFECTS
+ * DR 241. Does unique_copy() require CopyConstructible and Assignable?
+ */
+ template<typename _InputIterator, typename _OutputIterator,
+ typename _BinaryPredicate>
+ inline _OutputIterator
+ unique_copy(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result,
+ _BinaryPredicate __binary_pred)
+ {
+ // concept requirements -- predicates checked later
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return __result;
+ return std::__unique_copy(__first, __last, __result, __binary_pred,
+ std::__iterator_category(__first),
+ std::__iterator_category(__result));
+ }
+
+
+ /**
+ * @brief Randomly shuffle the elements of a sequence.
+ * @ingroup mutating_algorithms
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @return Nothing.
+ *
+ * Reorder the elements in the range @p [first,last) using a random
+ * distribution, so that every possible ordering of the sequence is
+ * equally likely.
+ */
+ template<typename _RandomAccessIterator>
+ inline void
+ random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first != __last)
+ for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
+ std::iter_swap(__i, __first + (std::rand() % ((__i - __first) + 1)));
+ }
+
+ /**
+ * @brief Shuffle the elements of a sequence using a random number
+ * generator.
+ * @ingroup mutating_algorithms
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param rand The RNG functor or function.
+ * @return Nothing.
+ *
+ * Reorders the elements in the range @p [first,last) using @p rand to
+ * provide a random distribution. Calling @p rand(N) for a positive
+ * integer @p N should return a randomly chosen integer from the
+ * range [0,N).
+ */
+ template<typename _RandomAccessIterator, typename _RandomNumberGenerator>
+ void
+ random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last,
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ _RandomNumberGenerator&& __rand)
+#else
+ _RandomNumberGenerator& __rand)
+#endif
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return;
+ for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
+ std::iter_swap(__i, __first + __rand((__i - __first) + 1));
+ }
+
+
+ /**
+ * @brief Move elements for which a predicate is true to the beginning
+ * of a sequence.
+ * @ingroup mutating_algorithms
+ * @param first A forward iterator.
+ * @param last A forward iterator.
+ * @param pred A predicate functor.
+ * @return An iterator @p middle such that @p pred(i) is true for each
+ * iterator @p i in the range @p [first,middle) and false for each @p i
+ * in the range @p [middle,last).
+ *
+ * @p pred must not modify its operand. @p partition() does not preserve
+ * the relative ordering of elements in each group, use
+ * @p stable_partition() if this is needed.
+ */
+ template<typename _ForwardIterator, typename _Predicate>
+ inline _ForwardIterator
+ partition(_ForwardIterator __first, _ForwardIterator __last,
+ _Predicate __pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator>)
+ __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ return std::__partition(__first, __last, __pred,
+ std::__iterator_category(__first));
+ }
+
+
+
+ /**
+ * @brief Sort the smallest elements of a sequence.
+ * @ingroup sorting_algorithms
+ * @param first An iterator.
+ * @param middle Another iterator.
+ * @param last Another iterator.
+ * @return Nothing.
+ *
+ * Sorts the smallest @p (middle-first) elements in the range
+ * @p [first,last) and moves them to the range @p [first,middle). The
+ * order of the remaining elements in the range @p [middle,last) is
+ * undefined.
+ * After the sort if @p i and @j are iterators in the range
+ * @p [first,middle) such that @i precedes @j and @k is an iterator in
+ * the range @p [middle,last) then @p *j<*i and @p *k<*i are both false.
+ */
+ template<typename _RandomAccessIterator>
+ inline void
+ partial_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __middle,
+ _RandomAccessIterator __last)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
+ __glibcxx_requires_valid_range(__first, __middle);
+ __glibcxx_requires_valid_range(__middle, __last);
+
+ std::__heap_select(__first, __middle, __last);
+ std::sort_heap(__first, __middle);
+ }
+
+ /**
+ * @brief Sort the smallest elements of a sequence using a predicate
+ * for comparison.
+ * @ingroup sorting_algorithms
+ * @param first An iterator.
+ * @param middle Another iterator.
+ * @param last Another iterator.
+ * @param comp A comparison functor.
+ * @return Nothing.
+ *
+ * Sorts the smallest @p (middle-first) elements in the range
+ * @p [first,last) and moves them to the range @p [first,middle). The
+ * order of the remaining elements in the range @p [middle,last) is
+ * undefined.
+ * After the sort if @p i and @j are iterators in the range
+ * @p [first,middle) such that @i precedes @j and @k is an iterator in
+ * the range @p [middle,last) then @p *comp(j,*i) and @p comp(*k,*i)
+ * are both false.
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline void
+ partial_sort(_RandomAccessIterator __first,
+ _RandomAccessIterator __middle,
+ _RandomAccessIterator __last,
+ _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType, _ValueType>)
+ __glibcxx_requires_valid_range(__first, __middle);
+ __glibcxx_requires_valid_range(__middle, __last);
+
+ std::__heap_select(__first, __middle, __last, __comp);
+ std::sort_heap(__first, __middle, __comp);
+ }
+
+ /**
+ * @brief Sort a sequence just enough to find a particular position.
+ * @ingroup sorting_algorithms
+ * @param first An iterator.
+ * @param nth Another iterator.
+ * @param last Another iterator.
+ * @return Nothing.
+ *
+ * Rearranges the elements in the range @p [first,last) so that @p *nth
+ * is the same element that would have been in that position had the
+ * whole sequence been sorted.
+ * whole sequence been sorted. The elements either side of @p *nth are
+ * not completely sorted, but for any iterator @i in the range
+ * @p [first,nth) and any iterator @j in the range @p [nth,last) it
+ * holds that @p *j<*i is false.
+ */
+ template<typename _RandomAccessIterator>
+ inline void
+ nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth,
+ _RandomAccessIterator __last)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
+ __glibcxx_requires_valid_range(__first, __nth);
+ __glibcxx_requires_valid_range(__nth, __last);
+
+ if (__first == __last || __nth == __last)
+ return;
+
+ std::__introselect(__first, __nth, __last,
+ std::__lg(__last - __first) * 2);
+ }
+
+ /**
+ * @brief Sort a sequence just enough to find a particular position
+ * using a predicate for comparison.
+ * @ingroup sorting_algorithms
+ * @param first An iterator.
+ * @param nth Another iterator.
+ * @param last Another iterator.
+ * @param comp A comparison functor.
+ * @return Nothing.
+ *
+ * Rearranges the elements in the range @p [first,last) so that @p *nth
+ * is the same element that would have been in that position had the
+ * whole sequence been sorted. The elements either side of @p *nth are
+ * not completely sorted, but for any iterator @i in the range
+ * @p [first,nth) and any iterator @j in the range @p [nth,last) it
+ * holds that @p comp(*j,*i) is false.
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline void
+ nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth,
+ _RandomAccessIterator __last, _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType, _ValueType>)
+ __glibcxx_requires_valid_range(__first, __nth);
+ __glibcxx_requires_valid_range(__nth, __last);
+
+ if (__first == __last || __nth == __last)
+ return;
+
+ std::__introselect(__first, __nth, __last,
+ std::__lg(__last - __first) * 2, __comp);
+ }
+
+
+ /**
+ * @brief Sort the elements of a sequence.
+ * @ingroup sorting_algorithms
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @return Nothing.
+ *
+ * Sorts the elements in the range @p [first,last) in ascending order,
+ * such that @p *(i+1)<*i is false for each iterator @p i in the range
+ * @p [first,last-1).
+ *
+ * The relative ordering of equivalent elements is not preserved, use
+ * @p stable_sort() if this is needed.
+ */
+ template<typename _RandomAccessIterator>
+ inline void
+ sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first != __last)
+ {
+ std::__introsort_loop(__first, __last,
+ std::__lg(__last - __first) * 2);
+ std::__final_insertion_sort(__first, __last);
+ }
+ }
+
+ /**
+ * @brief Sort the elements of a sequence using a predicate for comparison.
+ * @ingroup sorting_algorithms
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param comp A comparison functor.
+ * @return Nothing.
+ *
+ * Sorts the elements in the range @p [first,last) in ascending order,
+ * such that @p comp(*(i+1),*i) is false for every iterator @p i in the
+ * range @p [first,last-1).
+ *
+ * The relative ordering of equivalent elements is not preserved, use
+ * @p stable_sort() if this is needed.
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline void
+ sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
+ _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare, _ValueType,
+ _ValueType>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first != __last)
+ {
+ std::__introsort_loop(__first, __last,
+ std::__lg(__last - __first) * 2, __comp);
+ std::__final_insertion_sort(__first, __last, __comp);
+ }
+ }
+
+ /**
+ * @brief Merges two sorted ranges.
+ * @ingroup sorting_algorithms
+ * @param first1 An iterator.
+ * @param first2 Another iterator.
+ * @param last1 Another iterator.
+ * @param last2 Another iterator.
+ * @param result An iterator pointing to the end of the merged range.
+ * @return An iterator pointing to the first element <em>not less
+ * than</em> @a val.
+ *
+ * Merges the ranges [first1,last1) and [first2,last2) into the sorted range
+ * [result, result + (last1-first1) + (last2-first2)). Both input ranges
+ * must be sorted, and the output range must not overlap with either of
+ * the input ranges. The sort is @e stable, that is, for equivalent
+ * elements in the two ranges, elements from the first range will always
+ * come before elements from the second.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator>
+ _OutputIterator
+ merge(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_set(__first1, __last1, __first2);
+ __glibcxx_requires_sorted_set(__first2, __last2, __first1);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ {
+ if (*__first2 < *__first1)
+ {
+ *__result = *__first2;
+ ++__first2;
+ }
+ else
+ {
+ *__result = *__first1;
+ ++__first1;
+ }
+ ++__result;
+ }
+ return std::copy(__first2, __last2, std::copy(__first1, __last1,
+ __result));
+ }
+
+ /**
+ * @brief Merges two sorted ranges.
+ * @ingroup sorting_algorithms
+ * @param first1 An iterator.
+ * @param first2 Another iterator.
+ * @param last1 Another iterator.
+ * @param last2 Another iterator.
+ * @param result An iterator pointing to the end of the merged range.
+ * @param comp A functor to use for comparisons.
+ * @return An iterator pointing to the first element "not less
+ * than" @a val.
+ *
+ * Merges the ranges [first1,last1) and [first2,last2) into the sorted range
+ * [result, result + (last1-first1) + (last2-first2)). Both input ranges
+ * must be sorted, and the output range must not overlap with either of
+ * the input ranges. The sort is @e stable, that is, for equivalent
+ * elements in the two ranges, elements from the first range will always
+ * come before elements from the second.
+ *
+ * The comparison function should have the same effects on ordering as
+ * the function used for the initial sort.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator, typename _Compare>
+ _OutputIterator
+ merge(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result, _Compare __comp)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp);
+ __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ {
+ if (__comp(*__first2, *__first1))
+ {
+ *__result = *__first2;
+ ++__first2;
+ }
+ else
+ {
+ *__result = *__first1;
+ ++__first1;
+ }
+ ++__result;
+ }
+ return std::copy(__first2, __last2, std::copy(__first1, __last1,
+ __result));
+ }
+
+
+ /**
+ * @brief Sort the elements of a sequence, preserving the relative order
+ * of equivalent elements.
+ * @ingroup sorting_algorithms
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @return Nothing.
+ *
+ * Sorts the elements in the range @p [first,last) in ascending order,
+ * such that @p *(i+1)<*i is false for each iterator @p i in the range
+ * @p [first,last-1).
+ *
+ * The relative ordering of equivalent elements is preserved, so any two
+ * elements @p x and @p y in the range @p [first,last) such that
+ * @p x<y is false and @p y<x is false will have the same relative
+ * ordering after calling @p stable_sort().
+ */
+ template<typename _RandomAccessIterator>
+ inline void
+ stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ _Temporary_buffer<_RandomAccessIterator, _ValueType> __buf(__first,
+ __last);
+ if (__buf.begin() == 0)
+ std::__inplace_stable_sort(__first, __last);
+ else
+ std::__stable_sort_adaptive(__first, __last, __buf.begin(),
+ _DistanceType(__buf.size()));
+ }
+
+ /**
+ * @brief Sort the elements of a sequence using a predicate for comparison,
+ * preserving the relative order of equivalent elements.
+ * @ingroup sorting_algorithms
+ * @param first An iterator.
+ * @param last Another iterator.
+ * @param comp A comparison functor.
+ * @return Nothing.
+ *
+ * Sorts the elements in the range @p [first,last) in ascending order,
+ * such that @p comp(*(i+1),*i) is false for each iterator @p i in the
+ * range @p [first,last-1).
+ *
+ * The relative ordering of equivalent elements is preserved, so any two
+ * elements @p x and @p y in the range @p [first,last) such that
+ * @p comp(x,y) is false and @p comp(y,x) is false will have the same
+ * relative ordering after calling @p stable_sort().
+ */
+ template<typename _RandomAccessIterator, typename _Compare>
+ inline void
+ stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
+ _Compare __comp)
+ {
+ typedef typename iterator_traits<_RandomAccessIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_RandomAccessIterator>::difference_type
+ _DistanceType;
+
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType,
+ _ValueType>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ _Temporary_buffer<_RandomAccessIterator, _ValueType> __buf(__first,
+ __last);
+ if (__buf.begin() == 0)
+ std::__inplace_stable_sort(__first, __last, __comp);
+ else
+ std::__stable_sort_adaptive(__first, __last, __buf.begin(),
+ _DistanceType(__buf.size()), __comp);
+ }
+
+
+ /**
+ * @brief Return the union of two sorted ranges.
+ * @ingroup set_algorithms
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @return End of the output range.
+ * @ingroup set_algorithms
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * each range in order to the output range. Iterators increment for each
+ * range. When the current element of one range is less than the other,
+ * that element is copied and the iterator advanced. If an element is
+ * contained in both ranges, the element from the first range is copied and
+ * both ranges advance. The output range may not overlap either input
+ * range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator>
+ _OutputIterator
+ set_union(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_set(__first1, __last1, __first2);
+ __glibcxx_requires_sorted_set(__first2, __last2, __first1);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ {
+ if (*__first1 < *__first2)
+ {
+ *__result = *__first1;
+ ++__first1;
+ }
+ else if (*__first2 < *__first1)
+ {
+ *__result = *__first2;
+ ++__first2;
+ }
+ else
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__first2;
+ }
+ ++__result;
+ }
+ return std::copy(__first2, __last2, std::copy(__first1, __last1,
+ __result));
+ }
+
+ /**
+ * @brief Return the union of two sorted ranges using a comparison functor.
+ * @ingroup set_algorithms
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @param comp The comparison functor.
+ * @return End of the output range.
+ * @ingroup set_algorithms
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * each range in order to the output range. Iterators increment for each
+ * range. When the current element of one range is less than the other
+ * according to @a comp, that element is copied and the iterator advanced.
+ * If an equivalent element according to @a comp is contained in both
+ * ranges, the element from the first range is copied and both ranges
+ * advance. The output range may not overlap either input range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator, typename _Compare>
+ _OutputIterator
+ set_union(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result, _Compare __comp)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp);
+ __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ {
+ if (__comp(*__first1, *__first2))
+ {
+ *__result = *__first1;
+ ++__first1;
+ }
+ else if (__comp(*__first2, *__first1))
+ {
+ *__result = *__first2;
+ ++__first2;
+ }
+ else
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__first2;
+ }
+ ++__result;
+ }
+ return std::copy(__first2, __last2, std::copy(__first1, __last1,
+ __result));
+ }
+
+ /**
+ * @brief Return the intersection of two sorted ranges.
+ * @ingroup set_algorithms
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @return End of the output range.
+ * @ingroup set_algorithms
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * both ranges in order to the output range. Iterators increment for each
+ * range. When the current element of one range is less than the other,
+ * that iterator advances. If an element is contained in both ranges, the
+ * element from the first range is copied and both ranges advance. The
+ * output range may not overlap either input range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator>
+ _OutputIterator
+ set_intersection(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_set(__first1, __last1, __first2);
+ __glibcxx_requires_sorted_set(__first2, __last2, __first1);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ if (*__first1 < *__first2)
+ ++__first1;
+ else if (*__first2 < *__first1)
+ ++__first2;
+ else
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__first2;
+ ++__result;
+ }
+ return __result;
+ }
+
+ /**
+ * @brief Return the intersection of two sorted ranges using comparison
+ * functor.
+ * @ingroup set_algorithms
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @param comp The comparison functor.
+ * @return End of the output range.
+ * @ingroup set_algorithms
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * both ranges in order to the output range. Iterators increment for each
+ * range. When the current element of one range is less than the other
+ * according to @a comp, that iterator advances. If an element is
+ * contained in both ranges according to @a comp, the element from the
+ * first range is copied and both ranges advance. The output range may not
+ * overlap either input range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator, typename _Compare>
+ _OutputIterator
+ set_intersection(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result, _Compare __comp)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp);
+ __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ if (__comp(*__first1, *__first2))
+ ++__first1;
+ else if (__comp(*__first2, *__first1))
+ ++__first2;
+ else
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__first2;
+ ++__result;
+ }
+ return __result;
+ }
+
+ /**
+ * @brief Return the difference of two sorted ranges.
+ * @ingroup set_algorithms
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @return End of the output range.
+ * @ingroup set_algorithms
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * the first range but not the second in order to the output range.
+ * Iterators increment for each range. When the current element of the
+ * first range is less than the second, that element is copied and the
+ * iterator advances. If the current element of the second range is less,
+ * the iterator advances, but no element is copied. If an element is
+ * contained in both ranges, no elements are copied and both ranges
+ * advance. The output range may not overlap either input range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator>
+ _OutputIterator
+ set_difference(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_set(__first1, __last1, __first2);
+ __glibcxx_requires_sorted_set(__first2, __last2, __first1);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ if (*__first1 < *__first2)
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__result;
+ }
+ else if (*__first2 < *__first1)
+ ++__first2;
+ else
+ {
+ ++__first1;
+ ++__first2;
+ }
+ return std::copy(__first1, __last1, __result);
+ }
+
+ /**
+ * @brief Return the difference of two sorted ranges using comparison
+ * functor.
+ * @ingroup set_algorithms
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @param comp The comparison functor.
+ * @return End of the output range.
+ * @ingroup set_algorithms
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * the first range but not the second in order to the output range.
+ * Iterators increment for each range. When the current element of the
+ * first range is less than the second according to @a comp, that element
+ * is copied and the iterator advances. If the current element of the
+ * second range is less, no element is copied and the iterator advances.
+ * If an element is contained in both ranges according to @a comp, no
+ * elements are copied and both ranges advance. The output range may not
+ * overlap either input range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator, typename _Compare>
+ _OutputIterator
+ set_difference(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result, _Compare __comp)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp);
+ __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ if (__comp(*__first1, *__first2))
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__result;
+ }
+ else if (__comp(*__first2, *__first1))
+ ++__first2;
+ else
+ {
+ ++__first1;
+ ++__first2;
+ }
+ return std::copy(__first1, __last1, __result);
+ }
+
+ /**
+ * @brief Return the symmetric difference of two sorted ranges.
+ * @ingroup set_algorithms
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @return End of the output range.
+ * @ingroup set_algorithms
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * one range but not the other in order to the output range. Iterators
+ * increment for each range. When the current element of one range is less
+ * than the other, that element is copied and the iterator advances. If an
+ * element is contained in both ranges, no elements are copied and both
+ * ranges advance. The output range may not overlap either input range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator>
+ _OutputIterator
+ set_symmetric_difference(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_set(__first1, __last1, __first2);
+ __glibcxx_requires_sorted_set(__first2, __last2, __first1);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ if (*__first1 < *__first2)
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__result;
+ }
+ else if (*__first2 < *__first1)
+ {
+ *__result = *__first2;
+ ++__first2;
+ ++__result;
+ }
+ else
+ {
+ ++__first1;
+ ++__first2;
+ }
+ return std::copy(__first2, __last2, std::copy(__first1,
+ __last1, __result));
+ }
+
+ /**
+ * @brief Return the symmetric difference of two sorted ranges using
+ * comparison functor.
+ * @ingroup set_algorithms
+ * @param first1 Start of first range.
+ * @param last1 End of first range.
+ * @param first2 Start of second range.
+ * @param last2 End of second range.
+ * @param comp The comparison functor.
+ * @return End of the output range.
+ * @ingroup set_algorithms
+ *
+ * This operation iterates over both ranges, copying elements present in
+ * one range but not the other in order to the output range. Iterators
+ * increment for each range. When the current element of one range is less
+ * than the other according to @a comp, that element is copied and the
+ * iterator advances. If an element is contained in both ranges according
+ * to @a comp, no elements are copied and both ranges advance. The output
+ * range may not overlap either input range.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _OutputIterator, typename _Compare>
+ _OutputIterator
+ set_symmetric_difference(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _InputIterator2 __last2,
+ _OutputIterator __result,
+ _Compare __comp)
+ {
+ typedef typename iterator_traits<_InputIterator1>::value_type
+ _ValueType1;
+ typedef typename iterator_traits<_InputIterator2>::value_type
+ _ValueType2;
+
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType1>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
+ _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ _ValueType2, _ValueType1>)
+ __glibcxx_requires_sorted_set_pred(__first1, __last1, __first2, __comp);
+ __glibcxx_requires_sorted_set_pred(__first2, __last2, __first1, __comp);
+
+ while (__first1 != __last1 && __first2 != __last2)
+ if (__comp(*__first1, *__first2))
+ {
+ *__result = *__first1;
+ ++__first1;
+ ++__result;
+ }
+ else if (__comp(*__first2, *__first1))
+ {
+ *__result = *__first2;
+ ++__first2;
+ ++__result;
+ }
+ else
+ {
+ ++__first1;
+ ++__first2;
+ }
+ return std::copy(__first2, __last2,
+ std::copy(__first1, __last1, __result));
+ }
+
+
+ /**
+ * @brief Return the minimum element in a range.
+ * @ingroup sorting_algorithms
+ * @param first Start of range.
+ * @param last End of range.
+ * @return Iterator referencing the first instance of the smallest value.
+ */
+ template<typename _ForwardIterator>
+ _ForwardIterator
+ min_element(_ForwardIterator __first, _ForwardIterator __last)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return __first;
+ _ForwardIterator __result = __first;
+ while (++__first != __last)
+ if (*__first < *__result)
+ __result = __first;
+ return __result;
+ }
+
+ /**
+ * @brief Return the minimum element in a range using comparison functor.
+ * @ingroup sorting_algorithms
+ * @param first Start of range.
+ * @param last End of range.
+ * @param comp Comparison functor.
+ * @return Iterator referencing the first instance of the smallest value
+ * according to comp.
+ */
+ template<typename _ForwardIterator, typename _Compare>
+ _ForwardIterator
+ min_element(_ForwardIterator __first, _ForwardIterator __last,
+ _Compare __comp)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return __first;
+ _ForwardIterator __result = __first;
+ while (++__first != __last)
+ if (__comp(*__first, *__result))
+ __result = __first;
+ return __result;
+ }
+
+ /**
+ * @brief Return the maximum element in a range.
+ * @ingroup sorting_algorithms
+ * @param first Start of range.
+ * @param last End of range.
+ * @return Iterator referencing the first instance of the largest value.
+ */
+ template<typename _ForwardIterator>
+ _ForwardIterator
+ max_element(_ForwardIterator __first, _ForwardIterator __last)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanComparableConcept<
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last)
+ return __first;
+ _ForwardIterator __result = __first;
+ while (++__first != __last)
+ if (*__result < *__first)
+ __result = __first;
+ return __result;
+ }
+
+ /**
+ * @brief Return the maximum element in a range using comparison functor.
+ * @ingroup sorting_algorithms
+ * @param first Start of range.
+ * @param last End of range.
+ * @param comp Comparison functor.
+ * @return Iterator referencing the first instance of the largest value
+ * according to comp.
+ */
+ template<typename _ForwardIterator, typename _Compare>
+ _ForwardIterator
+ max_element(_ForwardIterator __first, _ForwardIterator __last,
+ _Compare __comp)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_BinaryPredicateConcept<_Compare,
+ typename iterator_traits<_ForwardIterator>::value_type,
+ typename iterator_traits<_ForwardIterator>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ if (__first == __last) return __first;
+ _ForwardIterator __result = __first;
+ while (++__first != __last)
+ if (__comp(*__result, *__first))
+ __result = __first;
+ return __result;
+ }
-#endif /* _ALGO_H */
+_GLIBCXX_END_NESTED_NAMESPACE
+#endif /* _STL_ALGO_H */
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