-// Bits and pieces used in algorithms -*- C++ -*-
+// Core algorithmic facilities -*- C++ -*-
-// Copyright (C) 2001, 2002, 2003, 2004, 2005 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 _ALGOBASE_H
-#define _ALGOBASE_H 1
+#ifndef _STL_ALGOBASE_H
+#define _STL_ALGOBASE_H 1
#include <bits/c++config.h>
-#include <cstring>
-#include <climits>
-#include <cstdlib>
#include <cstddef>
-#include <iosfwd>
-#include <bits/stl_pair.h>
+#include <bits/functexcept.h>
#include <bits/cpp_type_traits.h>
+#include <ext/type_traits.h>
+#include <ext/numeric_traits.h>
+#include <bits/stl_pair.h>
#include <bits/stl_iterator_base_types.h>
#include <bits/stl_iterator_base_funcs.h>
#include <bits/stl_iterator.h>
#include <bits/concept_check.h>
#include <debug/debug.h>
+#include <bits/move.h> // For std::swap and _GLIBCXX_MOVE
-namespace std
-{
-
- /**
- * @brief Swaps two values.
- * @param a A thing of arbitrary type.
- * @param b Another thing of arbitrary type.
- * @return Nothing.
- *
- * This is the simple classic generic implementation. It will work on
- * any type which has a copy constructor and an assignment operator.
- */
- template<typename _Tp>
- inline void
- swap(_Tp& __a, _Tp& __b)
- {
- // concept requirements
- __glibcxx_function_requires(_SGIAssignableConcept<_Tp>)
-
- const _Tp __tmp = __a;
- __a = __b;
- __b = __tmp;
- }
+_GLIBCXX_BEGIN_NAMESPACE(std)
// See http://gcc.gnu.org/ml/libstdc++/2004-08/msg00167.html: in a
// nutshell, we are partially implementing the resolution of DR 187,
{
typedef typename iterator_traits<_ForwardIterator1>::value_type
_ValueType1;
- const _ValueType1 __tmp = *__a;
- *__a = *__b;
- *__b = __tmp;
+ _ValueType1 __tmp = _GLIBCXX_MOVE(*__a);
+ *__a = _GLIBCXX_MOVE(*__b);
+ *__b = _GLIBCXX_MOVE(__tmp);
}
};
/**
* @brief Swaps the contents of two iterators.
+ * @ingroup mutating_algorithms
* @param a An iterator.
* @param b Another iterator.
* @return Nothing.
_ValueType2>)
__glibcxx_function_requires(_ConvertibleConcept<_ValueType2,
_ValueType1>)
- std::__iter_swap<__are_same<_ValueType1, _ValueType2>::_M_type>::
+
+ typedef typename iterator_traits<_ForwardIterator1>::reference
+ _ReferenceType1;
+ typedef typename iterator_traits<_ForwardIterator2>::reference
+ _ReferenceType2;
+ std::__iter_swap<__are_same<_ValueType1, _ValueType2>::__value
+ && __are_same<_ValueType1&, _ReferenceType1>::__value
+ && __are_same<_ValueType2&, _ReferenceType2>::__value>::
iter_swap(__a, __b);
}
- #undef min
- #undef max
+ /**
+ * @brief Swap the elements of two sequences.
+ * @ingroup mutating_algorithms
+ * @param first1 A forward iterator.
+ * @param last1 A forward iterator.
+ * @param first2 A forward iterator.
+ * @return An iterator equal to @p first2+(last1-first1).
+ *
+ * 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.
+ */
+ template<typename _ForwardIterator1, typename _ForwardIterator2>
+ _ForwardIterator2
+ swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
+ _ForwardIterator2 __first2)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator1>)
+ __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
+ _ForwardIterator2>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+
+ for (; __first1 != __last1; ++__first1, ++__first2)
+ std::iter_swap(__first1, __first2);
+ return __first2;
+ }
/**
* @brief This does what you think it does.
+ * @ingroup sorting_algorithms
* @param a A thing of arbitrary type.
* @param b Another thing of arbitrary type.
* @return The lesser of the parameters.
/**
* @brief This does what you think it does.
+ * @ingroup sorting_algorithms
* @param a A thing of arbitrary type.
* @param b Another thing of arbitrary type.
* @return The greater of the parameters.
/**
* @brief This does what you think it does.
+ * @ingroup sorting_algorithms
* @param a A thing of arbitrary type.
* @param b Another thing of arbitrary type.
- * @param comp A @link s20_3_3_comparisons comparison functor@endlink.
+ * @param comp A @link comparison_functors comparison functor@endlink.
* @return The lesser of the parameters.
*
* This will work on temporary expressions, since they are only evaluated
/**
* @brief This does what you think it does.
+ * @ingroup sorting_algorithms
* @param a A thing of arbitrary type.
* @param b Another thing of arbitrary type.
- * @param comp A @link s20_3_3_comparisons comparison functor@endlink.
+ * @param comp A @link comparison_functors comparison functor@endlink.
* @return The greater of the parameters.
*
* This will work on temporary expressions, since they are only evaluated
return __a;
}
+
+ // If _Iterator has a base returns it otherwise _Iterator is returned
+ // untouched
+ template<typename _Iterator, bool _HasBase>
+ struct _Iter_base
+ {
+ typedef _Iterator iterator_type;
+ static iterator_type
+ _S_base(_Iterator __it)
+ { return __it; }
+ };
+
+ template<typename _Iterator>
+ struct _Iter_base<_Iterator, true>
+ {
+ typedef typename _Iterator::iterator_type iterator_type;
+ static iterator_type
+ _S_base(_Iterator __it)
+ { return __it.base(); }
+ };
+
+ // If _Iterator is a __normal_iterator return its base (a plain pointer,
+ // normally) otherwise return it untouched. See copy, fill, ...
+ template<typename _Iterator>
+ struct _Niter_base
+ : _Iter_base<_Iterator, __is_normal_iterator<_Iterator>::__value>
+ { };
+
+ template<typename _Iterator>
+ inline typename _Niter_base<_Iterator>::iterator_type
+ __niter_base(_Iterator __it)
+ { return std::_Niter_base<_Iterator>::_S_base(__it); }
+
+ // Likewise, for move_iterator.
+ template<typename _Iterator>
+ struct _Miter_base
+ : _Iter_base<_Iterator, __is_move_iterator<_Iterator>::__value>
+ { };
+
+ template<typename _Iterator>
+ inline typename _Miter_base<_Iterator>::iterator_type
+ __miter_base(_Iterator __it)
+ { return std::_Miter_base<_Iterator>::_S_base(__it); }
+
// All of these auxiliary structs serve two purposes. (1) Replace
// calls to copy with memmove whenever possible. (Memmove, not memcpy,
// because the input and output ranges are permitted to overlap.)
// (2) If we're using random access iterators, then write the loop as
// a for loop with an explicit count.
- template<bool, typename>
- struct __copy
+ template<bool, bool, typename>
+ struct __copy_move
{
template<typename _II, typename _OI>
static _OI
- copy(_II __first, _II __last, _OI __result)
+ __copy_m(_II __first, _II __last, _OI __result)
{
for (; __first != __last; ++__result, ++__first)
*__result = *__first;
}
};
- template<bool _BoolType>
- struct __copy<_BoolType, random_access_iterator_tag>
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ template<typename _Category>
+ struct __copy_move<true, false, _Category>
+ {
+ template<typename _II, typename _OI>
+ static _OI
+ __copy_m(_II __first, _II __last, _OI __result)
+ {
+ for (; __first != __last; ++__result, ++__first)
+ *__result = std::move(*__first);
+ return __result;
+ }
+ };
+#endif
+
+ template<>
+ struct __copy_move<false, false, random_access_iterator_tag>
{
template<typename _II, typename _OI>
static _OI
- copy(_II __first, _II __last, _OI __result)
+ __copy_m(_II __first, _II __last, _OI __result)
{
typedef typename iterator_traits<_II>::difference_type _Distance;
for(_Distance __n = __last - __first; __n > 0; --__n)
}
};
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
template<>
- struct __copy<true, random_access_iterator_tag>
+ struct __copy_move<true, false, random_access_iterator_tag>
+ {
+ template<typename _II, typename _OI>
+ static _OI
+ __copy_m(_II __first, _II __last, _OI __result)
+ {
+ typedef typename iterator_traits<_II>::difference_type _Distance;
+ for(_Distance __n = __last - __first; __n > 0; --__n)
+ {
+ *__result = std::move(*__first);
+ ++__first;
+ ++__result;
+ }
+ return __result;
+ }
+ };
+#endif
+
+ template<bool _IsMove>
+ struct __copy_move<_IsMove, true, random_access_iterator_tag>
{
template<typename _Tp>
static _Tp*
- copy(const _Tp* __first, const _Tp* __last, _Tp* __result)
- {
- std::memmove(__result, __first, sizeof(_Tp) * (__last - __first));
- return __result + (__last - __first);
+ __copy_m(const _Tp* __first, const _Tp* __last, _Tp* __result)
+ {
+ const ptrdiff_t _Num = __last - __first;
+ if (_Num)
+ __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
+ return __result + _Num;
}
};
- template<typename _II, typename _OI>
+ template<bool _IsMove, typename _II, typename _OI>
inline _OI
- __copy_aux(_II __first, _II __last, _OI __result)
+ __copy_move_a(_II __first, _II __last, _OI __result)
{
typedef typename iterator_traits<_II>::value_type _ValueTypeI;
typedef typename iterator_traits<_OI>::value_type _ValueTypeO;
typedef typename iterator_traits<_II>::iterator_category _Category;
- const bool __simple = (__is_scalar<_ValueTypeI>::_M_type
- && __is_pointer<_II>::_M_type
- && __is_pointer<_OI>::_M_type
- && __are_same<_ValueTypeI, _ValueTypeO>::_M_type);
+ const bool __simple = (__is_pod(_ValueTypeI)
+ && __is_pointer<_II>::__value
+ && __is_pointer<_OI>::__value
+ && __are_same<_ValueTypeI, _ValueTypeO>::__value);
- return std::__copy<__simple, _Category>::copy(__first, __last, __result);
+ return std::__copy_move<_IsMove, __simple,
+ _Category>::__copy_m(__first, __last, __result);
}
- template<bool, bool>
- struct __copy_normal
- {
- template<typename _II, typename _OI>
- static _OI
- copy_n(_II __first, _II __last, _OI __result)
- { return std::__copy_aux(__first, __last, __result); }
- };
+ // Helpers for streambuf iterators (either istream or ostream).
+ // NB: avoid including <iosfwd>, relatively large.
+ template<typename _CharT>
+ struct char_traits;
- template<>
- struct __copy_normal<true, false>
- {
- template<typename _II, typename _OI>
- static _OI
- copy_n(_II __first, _II __last, _OI __result)
- { return std::__copy_aux(__first.base(), __last.base(), __result); }
- };
+ template<typename _CharT, typename _Traits>
+ class istreambuf_iterator;
- template<>
- struct __copy_normal<false, true>
- {
- template<typename _II, typename _OI>
- static _OI
- copy_n(_II __first, _II __last, _OI __result)
- { return _OI(std::__copy_aux(__first, __last, __result.base())); }
- };
+ template<typename _CharT, typename _Traits>
+ class ostreambuf_iterator;
- template<>
- struct __copy_normal<true, true>
+ template<bool _IsMove, typename _CharT>
+ typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
+ ostreambuf_iterator<_CharT, char_traits<_CharT> > >::__type
+ __copy_move_a2(_CharT*, _CharT*,
+ ostreambuf_iterator<_CharT, char_traits<_CharT> >);
+
+ template<bool _IsMove, typename _CharT>
+ typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
+ ostreambuf_iterator<_CharT, char_traits<_CharT> > >::__type
+ __copy_move_a2(const _CharT*, const _CharT*,
+ ostreambuf_iterator<_CharT, char_traits<_CharT> >);
+
+ template<bool _IsMove, typename _CharT>
+ typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
+ _CharT*>::__type
+ __copy_move_a2(istreambuf_iterator<_CharT, char_traits<_CharT> >,
+ istreambuf_iterator<_CharT, char_traits<_CharT> >, _CharT*);
+
+ template<bool _IsMove, typename _II, typename _OI>
+ inline _OI
+ __copy_move_a2(_II __first, _II __last, _OI __result)
{
- template<typename _II, typename _OI>
- static _OI
- copy_n(_II __first, _II __last, _OI __result)
- { return _OI(std::__copy_aux(__first.base(), __last.base(),
- __result.base())); }
- };
+ return _OI(std::__copy_move_a<_IsMove>(std::__niter_base(__first),
+ std::__niter_base(__last),
+ std::__niter_base(__result)));
+ }
/**
* @brief Copies the range [first,last) into result.
+ * @ingroup mutating_algorithms
* @param first An input iterator.
* @param last An input iterator.
* @param result An output iterator.
* Note that the end of the output range is permitted to be contained
* within [first,last).
*/
- template<typename _InputIterator, typename _OutputIterator>
- inline _OutputIterator
- copy(_InputIterator __first, _InputIterator __last,
- _OutputIterator __result)
+ template<typename _II, typename _OI>
+ inline _OI
+ copy(_II __first, _II __last, _OI __result)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
- typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_function_requires(_InputIteratorConcept<_II>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OI,
+ typename iterator_traits<_II>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
- const bool __in = __is_normal_iterator<_InputIterator>::_M_type;
- const bool __out = __is_normal_iterator<_OutputIterator>::_M_type;
- return std::__copy_normal<__in, __out>::copy_n(__first, __last,
- __result);
+ return (std::__copy_move_a2<__is_move_iterator<_II>::__value>
+ (std::__miter_base(__first), std::__miter_base(__last),
+ __result));
}
-
- template<bool, typename>
- struct __copy_backward
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * @brief Moves the range [first,last) into result.
+ * @ingroup mutating_algorithms
+ * @param first An input iterator.
+ * @param last An input iterator.
+ * @param result An output iterator.
+ * @return result + (first - last)
+ *
+ * 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). Result may not be contained within
+ * [first,last); the move_backward function should be used instead.
+ *
+ * Note that the end of the output range is permitted to be contained
+ * within [first,last).
+ */
+ template<typename _II, typename _OI>
+ inline _OI
+ move(_II __first, _II __last, _OI __result)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_II>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OI,
+ typename iterator_traits<_II>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
+
+ return std::__copy_move_a2<true>(std::__miter_base(__first),
+ std::__miter_base(__last), __result);
+ }
+
+#define _GLIBCXX_MOVE3(_Tp, _Up, _Vp) std::move(_Tp, _Up, _Vp)
+#else
+#define _GLIBCXX_MOVE3(_Tp, _Up, _Vp) std::copy(_Tp, _Up, _Vp)
+#endif
+
+ template<bool, bool, typename>
+ struct __copy_move_backward
{
template<typename _BI1, typename _BI2>
static _BI2
- copy_b(_BI1 __first, _BI1 __last, _BI2 __result)
- {
+ __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
+ {
while (__first != __last)
*--__result = *--__last;
return __result;
}
};
- template<bool _BoolType>
- struct __copy_backward<_BoolType, random_access_iterator_tag>
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ template<typename _Category>
+ struct __copy_move_backward<true, false, _Category>
{
template<typename _BI1, typename _BI2>
static _BI2
- copy_b(_BI1 __first, _BI1 __last, _BI2 __result)
- {
+ __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
+ {
+ while (__first != __last)
+ *--__result = std::move(*--__last);
+ return __result;
+ }
+ };
+#endif
+
+ template<>
+ struct __copy_move_backward<false, false, random_access_iterator_tag>
+ {
+ template<typename _BI1, typename _BI2>
+ static _BI2
+ __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
+ {
typename iterator_traits<_BI1>::difference_type __n;
for (__n = __last - __first; __n > 0; --__n)
*--__result = *--__last;
}
};
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
template<>
- struct __copy_backward<true, random_access_iterator_tag>
+ struct __copy_move_backward<true, false, random_access_iterator_tag>
+ {
+ template<typename _BI1, typename _BI2>
+ static _BI2
+ __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
+ {
+ typename iterator_traits<_BI1>::difference_type __n;
+ for (__n = __last - __first; __n > 0; --__n)
+ *--__result = std::move(*--__last);
+ return __result;
+ }
+ };
+#endif
+
+ template<bool _IsMove>
+ struct __copy_move_backward<_IsMove, true, random_access_iterator_tag>
{
template<typename _Tp>
static _Tp*
- copy_b(const _Tp* __first, const _Tp* __last, _Tp* __result)
- {
+ __copy_move_b(const _Tp* __first, const _Tp* __last, _Tp* __result)
+ {
const ptrdiff_t _Num = __last - __first;
- std::memmove(__result - _Num, __first, sizeof(_Tp) * _Num);
+ if (_Num)
+ __builtin_memmove(__result - _Num, __first, sizeof(_Tp) * _Num);
return __result - _Num;
}
};
- template<typename _BI1, typename _BI2>
+ template<bool _IsMove, typename _BI1, typename _BI2>
inline _BI2
- __copy_backward_aux(_BI1 __first, _BI1 __last, _BI2 __result)
+ __copy_move_backward_a(_BI1 __first, _BI1 __last, _BI2 __result)
{
typedef typename iterator_traits<_BI1>::value_type _ValueType1;
typedef typename iterator_traits<_BI2>::value_type _ValueType2;
typedef typename iterator_traits<_BI1>::iterator_category _Category;
- const bool __simple = (__is_scalar<_ValueType1>::_M_type
- && __is_pointer<_BI1>::_M_type
- && __is_pointer<_BI2>::_M_type
- && __are_same<_ValueType1, _ValueType2>::_M_type);
-
- return std::__copy_backward<__simple, _Category>::copy_b(__first, __last,
- __result);
+ const bool __simple = (__is_pod(_ValueType1)
+ && __is_pointer<_BI1>::__value
+ && __is_pointer<_BI2>::__value
+ && __are_same<_ValueType1, _ValueType2>::__value);
+
+ return std::__copy_move_backward<_IsMove, __simple,
+ _Category>::__copy_move_b(__first,
+ __last,
+ __result);
}
- template<bool, bool>
- struct __copy_backward_normal
- {
- template<typename _BI1, typename _BI2>
- static _BI2
- copy_b_n(_BI1 __first, _BI1 __last, _BI2 __result)
- { return std::__copy_backward_aux(__first, __last, __result); }
- };
-
- template<>
- struct __copy_backward_normal<true, false>
- {
- template<typename _BI1, typename _BI2>
- static _BI2
- copy_b_n(_BI1 __first, _BI1 __last, _BI2 __result)
- { return std::__copy_backward_aux(__first.base(), __last.base(),
- __result); }
- };
-
- template<>
- struct __copy_backward_normal<false, true>
- {
- template<typename _BI1, typename _BI2>
- static _BI2
- copy_b_n(_BI1 __first, _BI1 __last, _BI2 __result)
- { return _BI2(std::__copy_backward_aux(__first, __last,
- __result.base())); }
- };
-
- template<>
- struct __copy_backward_normal<true, true>
+ template<bool _IsMove, typename _BI1, typename _BI2>
+ inline _BI2
+ __copy_move_backward_a2(_BI1 __first, _BI1 __last, _BI2 __result)
{
- template<typename _BI1, typename _BI2>
- static _BI2
- copy_b_n(_BI1 __first, _BI1 __last, _BI2 __result)
- { return _BI2(std::__copy_backward_aux(__first.base(), __last.base(),
- __result.base())); }
- };
+ return _BI2(std::__copy_move_backward_a<_IsMove>
+ (std::__niter_base(__first), std::__niter_base(__last),
+ std::__niter_base(__result)));
+ }
/**
* @brief Copies the range [first,last) into result.
+ * @ingroup mutating_algorithms
* @param first A bidirectional iterator.
* @param last A bidirectional iterator.
* @param result A bidirectional iterator.
* Result may not be in the range [first,last). Use copy instead. Note
* that the start of the output range may overlap [first,last).
*/
- template <typename _BI1, typename _BI2>
+ template<typename _BI1, typename _BI2>
inline _BI2
copy_backward(_BI1 __first, _BI1 __last, _BI2 __result)
{
typename iterator_traits<_BI2>::value_type>)
__glibcxx_requires_valid_range(__first, __last);
- const bool __bi1 = __is_normal_iterator<_BI1>::_M_type;
- const bool __bi2 = __is_normal_iterator<_BI2>::_M_type;
- return std::__copy_backward_normal<__bi1, __bi2>::copy_b_n(__first, __last,
- __result);
+ return (std::__copy_move_backward_a2<__is_move_iterator<_BI1>::__value>
+ (std::__miter_base(__first), std::__miter_base(__last),
+ __result));
}
- template<bool>
- struct __fill
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * @brief Moves the range [first,last) into result.
+ * @ingroup mutating_algorithms
+ * @param first A bidirectional iterator.
+ * @param last A bidirectional iterator.
+ * @param result A bidirectional iterator.
+ * @return result - (first - last)
+ *
+ * The function has the same effect as move, but starts at the end of the
+ * range and works its way to the start, returning the start of the result.
+ * 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).
+ *
+ * Result may not be in the range [first,last). Use move instead. Note
+ * that the start of the output range may overlap [first,last).
+ */
+ template<typename _BI1, typename _BI2>
+ inline _BI2
+ move_backward(_BI1 __first, _BI1 __last, _BI2 __result)
{
- template<typename _ForwardIterator, typename _Tp>
- static void
- fill(_ForwardIterator __first, _ForwardIterator __last,
- const _Tp& __value)
- {
- for (; __first != __last; ++__first)
- *__first = __value;
- }
- };
+ // concept requirements
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
+ __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
+ __glibcxx_function_requires(_ConvertibleConcept<
+ typename iterator_traits<_BI1>::value_type,
+ typename iterator_traits<_BI2>::value_type>)
+ __glibcxx_requires_valid_range(__first, __last);
- template<>
- struct __fill<true>
+ return std::__copy_move_backward_a2<true>(std::__miter_base(__first),
+ std::__miter_base(__last),
+ __result);
+ }
+
+#define _GLIBCXX_MOVE_BACKWARD3(_Tp, _Up, _Vp) std::move_backward(_Tp, _Up, _Vp)
+#else
+#define _GLIBCXX_MOVE_BACKWARD3(_Tp, _Up, _Vp) std::copy_backward(_Tp, _Up, _Vp)
+#endif
+
+ template<typename _ForwardIterator, typename _Tp>
+ inline typename
+ __gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, void>::__type
+ __fill_a(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __value)
{
- template<typename _ForwardIterator, typename _Tp>
- static void
- fill(_ForwardIterator __first, _ForwardIterator __last,
+ for (; __first != __last; ++__first)
+ *__first = __value;
+ }
+
+ template<typename _ForwardIterator, typename _Tp>
+ inline typename
+ __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, void>::__type
+ __fill_a(_ForwardIterator __first, _ForwardIterator __last,
const _Tp& __value)
- {
- const _Tp __tmp = __value;
- for (; __first != __last; ++__first)
- *__first = __tmp;
- }
- };
+ {
+ const _Tp __tmp = __value;
+ for (; __first != __last; ++__first)
+ *__first = __tmp;
+ }
+
+ // Specialization: for char types we can use memset.
+ template<typename _Tp>
+ inline typename
+ __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, void>::__type
+ __fill_a(_Tp* __first, _Tp* __last, const _Tp& __c)
+ {
+ const _Tp __tmp = __c;
+ __builtin_memset(__first, static_cast<unsigned char>(__tmp),
+ __last - __first);
+ }
/**
* @brief Fills the range [first,last) with copies of value.
+ * @ingroup mutating_algorithms
* @param first A forward iterator.
* @param last A forward iterator.
* @param value A reference-to-const of arbitrary type.
* @return Nothing.
*
- * This function fills a range with copies of the same value. For one-byte
- * types filling contiguous areas of memory, this becomes an inline call to
- * @c memset.
+ * This function fills a range with copies of the same value. For char
+ * types filling contiguous areas of memory, this becomes an inline call
+ * to @c memset or @c wmemset.
*/
template<typename _ForwardIterator, typename _Tp>
- void
+ inline void
fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value)
{
// concept requirements
_ForwardIterator>)
__glibcxx_requires_valid_range(__first, __last);
- const bool __scalar = __is_scalar<_Tp>::_M_type;
- std::__fill<__scalar>::fill(__first, __last, __value);
- }
-
- // Specialization: for one-byte types we can use memset.
- inline void
- fill(unsigned char* __first, unsigned char* __last, const unsigned char& __c)
- {
- __glibcxx_requires_valid_range(__first, __last);
- const unsigned char __tmp = __c;
- std::memset(__first, __tmp, __last - __first);
- }
-
- inline void
- fill(signed char* __first, signed char* __last, const signed char& __c)
- {
- __glibcxx_requires_valid_range(__first, __last);
- const signed char __tmp = __c;
- std::memset(__first, static_cast<unsigned char>(__tmp), __last - __first);
- }
-
- inline void
- fill(char* __first, char* __last, const char& __c)
- {
- __glibcxx_requires_valid_range(__first, __last);
- const char __tmp = __c;
- std::memset(__first, static_cast<unsigned char>(__tmp), __last - __first);
- }
-
- template<bool>
- struct __fill_n
- {
- template<typename _OutputIterator, typename _Size, typename _Tp>
- static _OutputIterator
- fill_n(_OutputIterator __first, _Size __n, const _Tp& __value)
- {
- for (; __n > 0; --__n, ++__first)
- *__first = __value;
- return __first;
- }
- };
+ std::__fill_a(std::__niter_base(__first), std::__niter_base(__last),
+ __value);
+ }
- template<>
- struct __fill_n<true>
+ template<typename _OutputIterator, typename _Size, typename _Tp>
+ inline typename
+ __gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, _OutputIterator>::__type
+ __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value)
{
- template<typename _OutputIterator, typename _Size, typename _Tp>
- static _OutputIterator
- fill_n(_OutputIterator __first, _Size __n, const _Tp& __value)
- {
- const _Tp __tmp = __value;
- for (; __n > 0; --__n, ++__first)
- *__first = __tmp;
- return __first;
- }
- };
+ for (__decltype(__n + 0) __niter = __n;
+ __niter > 0; --__niter, ++__first)
+ *__first = __value;
+ return __first;
+ }
+
+ template<typename _OutputIterator, typename _Size, typename _Tp>
+ inline typename
+ __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, _OutputIterator>::__type
+ __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value)
+ {
+ const _Tp __tmp = __value;
+ for (__decltype(__n + 0) __niter = __n;
+ __niter > 0; --__niter, ++__first)
+ *__first = __tmp;
+ return __first;
+ }
+
+ template<typename _Size, typename _Tp>
+ inline typename
+ __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, _Tp*>::__type
+ __fill_n_a(_Tp* __first, _Size __n, const _Tp& __c)
+ {
+ std::__fill_a(__first, __first + __n, __c);
+ return __first + __n;
+ }
/**
* @brief Fills the range [first,first+n) with copies of value.
+ * @ingroup mutating_algorithms
* @param first An output iterator.
* @param n The count of copies to perform.
* @param value A reference-to-const of arbitrary type.
* @return The iterator at first+n.
*
- * This function fills a range with copies of the same value. For one-byte
- * types filling contiguous areas of memory, this becomes an inline call to
- * @c memset.
+ * This function fills a range with copies of the same value. For char
+ * types filling contiguous areas of memory, this becomes an inline call
+ * to @c memset or @ wmemset.
+ *
+ * _GLIBCXX_RESOLVE_LIB_DEFECTS
+ * DR 865. More algorithms that throw away information
*/
- template<typename _OutputIterator, typename _Size, typename _Tp>
- _OutputIterator
- fill_n(_OutputIterator __first, _Size __n, const _Tp& __value)
+ template<typename _OI, typename _Size, typename _Tp>
+ inline _OI
+ fill_n(_OI __first, _Size __n, const _Tp& __value)
{
// concept requirements
- __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, _Tp>)
+ __glibcxx_function_requires(_OutputIteratorConcept<_OI, _Tp>)
- const bool __scalar = __is_scalar<_Tp>::_M_type;
- return std::__fill_n<__scalar>::fill_n(__first, __n, __value);
+ return _OI(std::__fill_n_a(std::__niter_base(__first), __n, __value));
}
- template<typename _Size>
- inline unsigned char*
- fill_n(unsigned char* __first, _Size __n, const unsigned char& __c)
+ template<bool _BoolType>
+ struct __equal
{
- std::fill(__first, __first + __n, __c);
- return __first + __n;
- }
+ template<typename _II1, typename _II2>
+ static bool
+ equal(_II1 __first1, _II1 __last1, _II2 __first2)
+ {
+ for (; __first1 != __last1; ++__first1, ++__first2)
+ if (!(*__first1 == *__first2))
+ return false;
+ return true;
+ }
+ };
- template<typename _Size>
- inline signed char*
- fill_n(char* __first, _Size __n, const signed char& __c)
+ template<>
+ struct __equal<true>
{
- std::fill(__first, __first + __n, __c);
- return __first + __n;
- }
+ template<typename _Tp>
+ static bool
+ equal(const _Tp* __first1, const _Tp* __last1, const _Tp* __first2)
+ {
+ return !__builtin_memcmp(__first1, __first2, sizeof(_Tp)
+ * (__last1 - __first1));
+ }
+ };
- template<typename _Size>
- inline char*
- fill_n(char* __first, _Size __n, const char& __c)
+ template<typename _II1, typename _II2>
+ inline bool
+ __equal_aux(_II1 __first1, _II1 __last1, _II2 __first2)
{
- std::fill(__first, __first + __n, __c);
- return __first + __n;
+ typedef typename iterator_traits<_II1>::value_type _ValueType1;
+ typedef typename iterator_traits<_II2>::value_type _ValueType2;
+ const bool __simple = (__is_integer<_ValueType1>::__value
+ && __is_pointer<_II1>::__value
+ && __is_pointer<_II2>::__value
+ && __are_same<_ValueType1, _ValueType2>::__value);
+
+ return std::__equal<__simple>::equal(__first1, __last1, __first2);
}
- /**
- * @brief Finds the places in ranges which don't match.
- * @param first1 An input iterator.
- * @param last1 An input iterator.
- * @param first2 An input iterator.
- * @return A pair of iterators pointing to the first mismatch.
- *
- * This compares the elements of two ranges using @c == and returns a pair
- * of iterators. The first iterator points into the first range, the
- * second iterator points into the second range, and the elements pointed
- * to by the iterators are not equal.
- */
- template<typename _InputIterator1, typename _InputIterator2>
- pair<_InputIterator1, _InputIterator2>
- mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2)
+
+ template<typename, typename>
+ struct __lc_rai
{
- // concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_EqualOpConcept<
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
- __glibcxx_requires_valid_range(__first1, __last1);
+ template<typename _II1, typename _II2>
+ static _II1
+ __newlast1(_II1, _II1 __last1, _II2, _II2)
+ { return __last1; }
+
+ template<typename _II>
+ static bool
+ __cnd2(_II __first, _II __last)
+ { return __first != __last; }
+ };
- while (__first1 != __last1 && *__first1 == *__first2)
+ template<>
+ struct __lc_rai<random_access_iterator_tag, random_access_iterator_tag>
+ {
+ template<typename _RAI1, typename _RAI2>
+ static _RAI1
+ __newlast1(_RAI1 __first1, _RAI1 __last1,
+ _RAI2 __first2, _RAI2 __last2)
{
- ++__first1;
- ++__first2;
- }
- return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
+ const typename iterator_traits<_RAI1>::difference_type
+ __diff1 = __last1 - __first1;
+ const typename iterator_traits<_RAI2>::difference_type
+ __diff2 = __last2 - __first2;
+ return __diff2 < __diff1 ? __first1 + __diff2 : __last1;
+ }
+
+ template<typename _RAI>
+ static bool
+ __cnd2(_RAI, _RAI)
+ { return true; }
+ };
+
+ template<bool _BoolType>
+ struct __lexicographical_compare
+ {
+ template<typename _II1, typename _II2>
+ static bool __lc(_II1, _II1, _II2, _II2);
+ };
+
+ template<bool _BoolType>
+ template<typename _II1, typename _II2>
+ bool
+ __lexicographical_compare<_BoolType>::
+ __lc(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
+ {
+ typedef typename iterator_traits<_II1>::iterator_category _Category1;
+ typedef typename iterator_traits<_II2>::iterator_category _Category2;
+ typedef std::__lc_rai<_Category1, _Category2> __rai_type;
+
+ __last1 = __rai_type::__newlast1(__first1, __last1,
+ __first2, __last2);
+ for (; __first1 != __last1 && __rai_type::__cnd2(__first2, __last2);
+ ++__first1, ++__first2)
+ {
+ if (*__first1 < *__first2)
+ return true;
+ if (*__first2 < *__first1)
+ return false;
+ }
+ return __first1 == __last1 && __first2 != __last2;
+ }
+
+ template<>
+ struct __lexicographical_compare<true>
+ {
+ template<typename _Tp, typename _Up>
+ static bool
+ __lc(const _Tp* __first1, const _Tp* __last1,
+ const _Up* __first2, const _Up* __last2)
+ {
+ const size_t __len1 = __last1 - __first1;
+ const size_t __len2 = __last2 - __first2;
+ const int __result = __builtin_memcmp(__first1, __first2,
+ std::min(__len1, __len2));
+ return __result != 0 ? __result < 0 : __len1 < __len2;
+ }
+ };
+
+ template<typename _II1, typename _II2>
+ inline bool
+ __lexicographical_compare_aux(_II1 __first1, _II1 __last1,
+ _II2 __first2, _II2 __last2)
+ {
+ typedef typename iterator_traits<_II1>::value_type _ValueType1;
+ typedef typename iterator_traits<_II2>::value_type _ValueType2;
+ const bool __simple =
+ (__is_byte<_ValueType1>::__value && __is_byte<_ValueType2>::__value
+ && !__gnu_cxx::__numeric_traits<_ValueType1>::__is_signed
+ && !__gnu_cxx::__numeric_traits<_ValueType2>::__is_signed
+ && __is_pointer<_II1>::__value
+ && __is_pointer<_II2>::__value);
+
+ return std::__lexicographical_compare<__simple>::__lc(__first1, __last1,
+ __first2, __last2);
}
/**
- * @brief Finds the places in ranges which don't match.
- * @param first1 An input iterator.
- * @param last1 An input iterator.
- * @param first2 An input iterator.
- * @param binary_pred A binary predicate @link s20_3_1_base functor@endlink.
- * @return A pair of iterators pointing to the first mismatch.
- *
- * This compares the elements of two ranges using the binary_pred
- * parameter, and returns a pair
- * of iterators. The first iterator points into the first range, the
- * second iterator points into the second range, and the elements pointed
- * to by the iterators are not equal.
+ * @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 <em>not less
+ * than</em> @a val, or end() if every element is less than
+ * @a val.
+ * @ingroup binary_search_algorithms
*/
- template<typename _InputIterator1, typename _InputIterator2,
- typename _BinaryPredicate>
- pair<_InputIterator1, _InputIterator2>
- mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _BinaryPredicate __binary_pred)
+ template<typename _ForwardIterator, typename _Tp>
+ _ForwardIterator
+ lower_bound(_ForwardIterator __first, _ForwardIterator __last,
+ const _Tp& __val)
{
+ typedef typename iterator_traits<_ForwardIterator>::value_type
+ _ValueType;
+ typedef typename iterator_traits<_ForwardIterator>::difference_type
+ _DistanceType;
+
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_requires_valid_range(__first1, __last1);
+ __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType, _Tp>)
+ __glibcxx_requires_partitioned_lower(__first, __last, __val);
- while (__first1 != __last1 && __binary_pred(*__first1, *__first2))
- {
- ++__first1;
- ++__first2;
- }
- return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
+ _DistanceType __len = std::distance(__first, __last);
+ _DistanceType __half;
+ _ForwardIterator __middle;
+
+ while (__len > 0)
+ {
+ __half = __len >> 1;
+ __middle = __first;
+ std::advance(__middle, __half);
+ if (*__middle < __val)
+ {
+ __first = __middle;
+ ++__first;
+ __len = __len - __half - 1;
+ }
+ else
+ __len = __half;
+ }
+ return __first;
}
+ /// This is a helper function for the sort routines and for random.tcc.
+ // Precondition: __n > 0.
+ template<typename _Size>
+ inline _Size
+ __lg(_Size __n)
+ {
+ _Size __k;
+ for (__k = 0; __n != 0; __n >>= 1)
+ ++__k;
+ return __k - 1;
+ }
+
+ inline int
+ __lg(int __n)
+ { return sizeof(int) * __CHAR_BIT__ - 1 - __builtin_clz(__n); }
+
+ inline long
+ __lg(long __n)
+ { return sizeof(long) * __CHAR_BIT__ - 1 - __builtin_clzl(__n); }
+
+ inline long long
+ __lg(long long __n)
+ { return sizeof(long long) * __CHAR_BIT__ - 1 - __builtin_clzll(__n); }
+
+_GLIBCXX_END_NAMESPACE
+
+_GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD_P)
+
/**
* @brief Tests a range for element-wise equality.
+ * @ingroup non_mutating_algorithms
* @param first1 An input iterator.
* @param last1 An input iterator.
* @param first2 An input iterator.
* false depending on whether all of the corresponding elements of the
* ranges are equal.
*/
- template<typename _InputIterator1, typename _InputIterator2>
+ template<typename _II1, typename _II2>
inline bool
- equal(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2)
+ equal(_II1 __first1, _II1 __last1, _II2 __first2)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_InputIteratorConcept<_II1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_II2>)
__glibcxx_function_requires(_EqualOpConcept<
- typename iterator_traits<_InputIterator1>::value_type,
- typename iterator_traits<_InputIterator2>::value_type>)
+ typename iterator_traits<_II1>::value_type,
+ typename iterator_traits<_II2>::value_type>)
__glibcxx_requires_valid_range(__first1, __last1);
-
- for (; __first1 != __last1; ++__first1, ++__first2)
- if (!(*__first1 == *__first2))
- return false;
- return true;
+
+ return std::__equal_aux(std::__niter_base(__first1),
+ std::__niter_base(__last1),
+ std::__niter_base(__first2));
}
/**
* @brief Tests a range for element-wise equality.
+ * @ingroup non_mutating_algorithms
* @param first1 An input iterator.
* @param last1 An input iterator.
* @param first2 An input iterator.
- * @param binary_pred A binary predicate @link s20_3_1_base functor@endlink.
- * @return A boolean true or false.
+ * @param binary_pred A binary predicate @link functors
+ * functor@endlink.
+ * @return A boolean true or false.
*
* This compares the elements of two ranges using the binary_pred
* parameter, and returns true or
* false depending on whether all of the corresponding elements of the
* ranges are equal.
*/
- template<typename _InputIterator1, typename _InputIterator2,
- typename _BinaryPredicate>
+ template<typename _IIter1, typename _IIter2, typename _BinaryPredicate>
inline bool
- equal(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2,
- _BinaryPredicate __binary_pred)
+ equal(_IIter1 __first1, _IIter1 __last1,
+ _IIter2 __first2, _BinaryPredicate __binary_pred)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_InputIteratorConcept<_IIter1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_IIter2>)
__glibcxx_requires_valid_range(__first1, __last1);
for (; __first1 != __last1; ++__first1, ++__first2)
- if (!__binary_pred(*__first1, *__first2))
+ if (!bool(__binary_pred(*__first1, *__first2)))
return false;
return true;
}
/**
- * @brief Performs "dictionary" comparison on ranges.
+ * @brief Performs @b dictionary comparison on ranges.
+ * @ingroup sorting_algorithms
* @param first1 An input iterator.
* @param last1 An input iterator.
* @param first2 An input iterator.
* @param last2 An input iterator.
* @return A boolean true or false.
*
- * "Returns true if the sequence of elements defined by the range
+ * <em>Returns true if the sequence of elements defined by the range
* [first1,last1) is lexicographically less than the sequence of elements
- * defined by the range [first2,last2). Returns false otherwise."
+ * defined by the range [first2,last2). Returns false otherwise.</em>
* (Quoted from [25.3.8]/1.) If the iterators are all character pointers,
* then this is an inline call to @c memcmp.
*/
- template<typename _InputIterator1, typename _InputIterator2>
- bool
- lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2)
+ template<typename _II1, typename _II2>
+ inline bool
+ lexicographical_compare(_II1 __first1, _II1 __last1,
+ _II2 __first2, _II2 __last2)
{
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
- __glibcxx_function_requires(_LessThanComparableConcept<
- typename iterator_traits<_InputIterator1>::value_type>)
- __glibcxx_function_requires(_LessThanComparableConcept<
- typename iterator_traits<_InputIterator2>::value_type>)
+ typedef typename iterator_traits<_II1>::value_type _ValueType1;
+ typedef typename iterator_traits<_II2>::value_type _ValueType2;
+ __glibcxx_function_requires(_InputIteratorConcept<_II1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_II2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
+ __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
__glibcxx_requires_valid_range(__first1, __last1);
__glibcxx_requires_valid_range(__first2, __last2);
- for (; __first1 != __last1 && __first2 != __last2;
- ++__first1, ++__first2)
- {
- if (*__first1 < *__first2)
- return true;
- if (*__first2 < *__first1)
- return false;
- }
- return __first1 == __last1 && __first2 != __last2;
+ return std::__lexicographical_compare_aux(std::__niter_base(__first1),
+ std::__niter_base(__last1),
+ std::__niter_base(__first2),
+ std::__niter_base(__last2));
}
/**
- * @brief Performs "dictionary" comparison on ranges.
+ * @brief Performs @b dictionary comparison on ranges.
+ * @ingroup sorting_algorithms
* @param first1 An input iterator.
* @param last1 An input iterator.
* @param first2 An input iterator.
* @param last2 An input iterator.
- * @param comp A @link s20_3_3_comparisons comparison functor@endlink.
+ * @param comp A @link comparison_functors comparison functor@endlink.
* @return A boolean true or false.
*
- * The same as the four-parameter @c lexigraphical_compare, but uses the
+ * The same as the four-parameter @c lexicographical_compare, but uses the
* comp parameter instead of @c <.
*/
- template<typename _InputIterator1, typename _InputIterator2,
- typename _Compare>
+ template<typename _II1, typename _II2, typename _Compare>
bool
- lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
- _InputIterator2 __first2, _InputIterator2 __last2,
- _Compare __comp)
+ lexicographical_compare(_II1 __first1, _II1 __last1,
+ _II2 __first2, _II2 __last2, _Compare __comp)
{
+ typedef typename iterator_traits<_II1>::iterator_category _Category1;
+ typedef typename iterator_traits<_II2>::iterator_category _Category2;
+ typedef std::__lc_rai<_Category1, _Category2> __rai_type;
+
// concept requirements
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
- __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_InputIteratorConcept<_II1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_II2>)
__glibcxx_requires_valid_range(__first1, __last1);
__glibcxx_requires_valid_range(__first2, __last2);
- for (; __first1 != __last1 && __first2 != __last2;
+ __last1 = __rai_type::__newlast1(__first1, __last1, __first2, __last2);
+ for (; __first1 != __last1 && __rai_type::__cnd2(__first2, __last2);
++__first1, ++__first2)
{
if (__comp(*__first1, *__first2))
return __first1 == __last1 && __first2 != __last2;
}
- inline bool
- lexicographical_compare(const unsigned char* __first1,
- const unsigned char* __last1,
- const unsigned char* __first2,
- const unsigned char* __last2)
- {
- __glibcxx_requires_valid_range(__first1, __last1);
- __glibcxx_requires_valid_range(__first2, __last2);
-
- const size_t __len1 = __last1 - __first1;
- const size_t __len2 = __last2 - __first2;
- const int __result = std::memcmp(__first1, __first2,
- std::min(__len1, __len2));
- return __result != 0 ? __result < 0 : __len1 < __len2;
- }
-
- inline bool
- lexicographical_compare(const char* __first1, const char* __last1,
- const char* __first2, const char* __last2)
- {
- __glibcxx_requires_valid_range(__first1, __last1);
- __glibcxx_requires_valid_range(__first2, __last2);
-
-#if CHAR_MAX == SCHAR_MAX
- return std::lexicographical_compare((const signed char*) __first1,
- (const signed char*) __last1,
- (const signed char*) __first2,
- (const signed char*) __last2);
-#else /* CHAR_MAX == SCHAR_MAX */
- return std::lexicographical_compare((const unsigned char*) __first1,
- (const unsigned char*) __last1,
- (const unsigned char*) __first2,
- (const unsigned char*) __last2);
-#endif /* CHAR_MAX == SCHAR_MAX */
- }
-
-} // namespace std
+ /**
+ * @brief Finds the places in ranges which don't match.
+ * @ingroup non_mutating_algorithms
+ * @param first1 An input iterator.
+ * @param last1 An input iterator.
+ * @param first2 An input iterator.
+ * @return A pair of iterators pointing to the first mismatch.
+ *
+ * This compares the elements of two ranges using @c == and returns a pair
+ * of iterators. The first iterator points into the first range, the
+ * second iterator points into the second range, and the elements pointed
+ * to by the iterators are not equal.
+ */
+ template<typename _InputIterator1, typename _InputIterator2>
+ pair<_InputIterator1, _InputIterator2>
+ mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_function_requires(_EqualOpConcept<
+ typename iterator_traits<_InputIterator1>::value_type,
+ typename iterator_traits<_InputIterator2>::value_type>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+
+ while (__first1 != __last1 && *__first1 == *__first2)
+ {
+ ++__first1;
+ ++__first2;
+ }
+ return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
+ }
+
+ /**
+ * @brief Finds the places in ranges which don't match.
+ * @ingroup non_mutating_algorithms
+ * @param first1 An input iterator.
+ * @param last1 An input iterator.
+ * @param first2 An input iterator.
+ * @param binary_pred A binary predicate @link functors
+ * functor@endlink.
+ * @return A pair of iterators pointing to the first mismatch.
+ *
+ * This compares the elements of two ranges using the binary_pred
+ * parameter, and returns a pair
+ * of iterators. The first iterator points into the first range, the
+ * second iterator points into the second range, and the elements pointed
+ * to by the iterators are not equal.
+ */
+ template<typename _InputIterator1, typename _InputIterator2,
+ typename _BinaryPredicate>
+ pair<_InputIterator1, _InputIterator2>
+ mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
+ _InputIterator2 __first2, _BinaryPredicate __binary_pred)
+ {
+ // concept requirements
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
+ __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
+ __glibcxx_requires_valid_range(__first1, __last1);
+
+ while (__first1 != __last1 && bool(__binary_pred(*__first1, *__first2)))
+ {
+ ++__first1;
+ ++__first2;
+ }
+ return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
+ }
+
+_GLIBCXX_END_NESTED_NAMESPACE
+
+// NB: This file is included within many other C++ includes, as a way
+// of getting the base algorithms. So, make sure that parallel bits
+// come in too if requested.
+#ifdef _GLIBCXX_PARALLEL
+# include <parallel/algobase.h>
+#endif
#endif
OSDN Git Service
