// Functions used by iterators -*- 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/>.
/*
*
* purpose. It is provided "as is" without express or implied warranty.
*/
-/** @file stl_iterator_base_funcs.h
+/** @file bits/stl_iterator_base_funcs.h
* This is an internal header file, included by other library headers.
- * You should not attempt to use it directly.
+ * Do not attempt to use it directly. @headername{iterator}
*
* This file contains all of the general iterator-related utility
* functions, such as distance() and advance().
*/
-#ifndef _ITERATOR_BASE_FUNCS_H
-#define _ITERATOR_BASE_FUNCS_H 1
+#ifndef _STL_ITERATOR_BASE_FUNCS_H
+#define _STL_ITERATOR_BASE_FUNCS_H 1
#pragma GCC system_header
+
#include <bits/concept_check.h>
-namespace std
+namespace std _GLIBCXX_VISIBILITY(default)
{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
template<typename _InputIterator>
inline typename iterator_traits<_InputIterator>::difference_type
__distance(_InputIterator __first, _InputIterator __last,
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
-
+
typename iterator_traits<_InputIterator>::difference_type __n = 0;
- while (__first != __last) {
- ++__first; ++__n;
- }
+ while (__first != __last)
+ {
+ ++__first;
+ ++__n;
+ }
return __n;
}
-
+
template<typename _RandomAccessIterator>
inline typename iterator_traits<_RandomAccessIterator>::difference_type
__distance(_RandomAccessIterator __first, _RandomAccessIterator __last,
random_access_iterator_tag)
{
// concept requirements
- __glibcxx_function_requires(_RandomAccessIteratorConcept<_RandomAccessIterator>)
+ __glibcxx_function_requires(_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
return __last - __first;
}
-
+
/**
* @brief A generalization of pointer arithmetic.
- * @param first An input iterator.
- * @param last An input iterator.
+ * @param __first An input iterator.
+ * @param __last An input iterator.
* @return The distance between them.
*
- * Returns @c n such that first + n == last. This requires that @p last
- * must be reachable from @p first. Note that @c n may be negative.
+ * Returns @c n such that __first + n == __last. This requires
+ * that @p __last must be reachable from @p __first. Note that @c
+ * n may be negative.
*
* For random access iterators, this uses their @c + and @c - operations
* and are constant time. For other %iterator classes they are linear time.
distance(_InputIterator __first, _InputIterator __last)
{
// concept requirements -- taken care of in __distance
- return std::__distance(__first, __last, std::__iterator_category(__first));
+ return std::__distance(__first, __last,
+ std::__iterator_category(__first));
}
-
+
template<typename _InputIterator, typename _Distance>
inline void
__advance(_InputIterator& __i, _Distance __n, input_iterator_tag)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
- while (__n--) ++__i;
+ while (__n--)
+ ++__i;
}
-
+
template<typename _BidirectionalIterator, typename _Distance>
inline void
__advance(_BidirectionalIterator& __i, _Distance __n,
- bidirectional_iterator_tag)
+ bidirectional_iterator_tag)
{
// concept requirements
- __glibcxx_function_requires(_BidirectionalIteratorConcept<_BidirectionalIterator>)
-
+ __glibcxx_function_requires(_BidirectionalIteratorConcept<
+ _BidirectionalIterator>)
if (__n > 0)
- while (__n--) ++__i;
+ while (__n--)
+ ++__i;
else
- while (__n++) --__i;
+ while (__n++)
+ --__i;
}
-
+
template<typename _RandomAccessIterator, typename _Distance>
inline void
__advance(_RandomAccessIterator& __i, _Distance __n,
random_access_iterator_tag)
{
// concept requirements
- __glibcxx_function_requires(_RandomAccessIteratorConcept<_RandomAccessIterator>)
+ __glibcxx_function_requires(_RandomAccessIteratorConcept<
+ _RandomAccessIterator>)
__i += __n;
}
-
+
/**
* @brief A generalization of pointer arithmetic.
- * @param i An input iterator.
- * @param n The "delta" by which to change @p i.
+ * @param __i An input iterator.
+ * @param __n The @a delta by which to change @p __i.
* @return Nothing.
*
* This increments @p i by @p n. For bidirectional and random access
- * iterators, @p n may be negative, in which case @p i is decremented.
+ * iterators, @p __n may be negative, in which case @p __i is decremented.
*
* For random access iterators, this uses their @c + and @c - operations
* and are constant time. For other %iterator classes they are linear time.
advance(_InputIterator& __i, _Distance __n)
{
// concept requirements -- taken care of in __advance
- std::__advance(__i, __n, std::__iterator_category(__i));
+ typename iterator_traits<_InputIterator>::difference_type __d = __n;
+ std::__advance(__i, __d, std::__iterator_category(__i));
}
-} // namespace std
-#endif /* _ITERATOR_BASE_FUNCS_H */
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+
+ template<typename _ForwardIterator>
+ inline _ForwardIterator
+ next(_ForwardIterator __x, typename
+ iterator_traits<_ForwardIterator>::difference_type __n = 1)
+ {
+ std::advance(__x, __n);
+ return __x;
+ }
+
+ template<typename _BidirectionalIterator>
+ inline _BidirectionalIterator
+ prev(_BidirectionalIterator __x, typename
+ iterator_traits<_BidirectionalIterator>::difference_type __n = 1)
+ {
+ std::advance(__x, -__n);
+ return __x;
+ }
+
+#endif // __GXX_EXPERIMENTAL_CXX0X__
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif /* _STL_ITERATOR_BASE_FUNCS_H */
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