ext/iterator
Go to the documentation of this file.
// HP/SGI iterator extensions -*- C++ -*-
// Copyright (C) 2001-2023 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 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// 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.
// 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/>.
/*
*
* Copyright (c) 1994
* Hewlett-Packard Company
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Hewlett-Packard Company makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*
* Copyright (c) 1996-1998
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*/
/** @file ext/iterator
* This file is a GNU extension to the Standard C++ Library (possibly
* containing extensions from the HP/SGI STL subset).
*/
#ifndef _EXT_ITERATOR
#define _EXT_ITERATOR 1
#pragma GCC system_header
#include <bits/concept_check.h>
#include <iterator>
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
// There are two signatures for distance. In addition to the one
// taking two iterators and returning a result, there is another
// taking two iterators and a reference-to-result variable, and
// returning nothing. The latter seems to be an SGI extension.
// -- pedwards
template<typename _InputIterator, typename _Distance>
inline void
__distance(_InputIterator __first, _InputIterator __last,
_Distance& __n, std::input_iterator_tag)
{
// concept requirements
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
while (__first != __last)
{
++__first;
++__n;
}
}
template<typename _RandomAccessIterator, typename _Distance>
inline void
__distance(_RandomAccessIterator __first, _RandomAccessIterator __last,
_Distance& __n, std::random_access_iterator_tag)
{
// concept requirements
__glibcxx_function_requires(_RandomAccessIteratorConcept<
_RandomAccessIterator>)
__n += __last - __first;
}
/**
* This is an SGI extension.
* @ingroup SGIextensions
* @doctodo
*/
template<typename _InputIterator, typename _Distance>
inline void
distance(_InputIterator __first, _InputIterator __last,
_Distance& __n)
{
// concept requirements -- taken care of in __distance
__distance(__first, __last, __n, std::__iterator_category(__first));
}
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif
concept_check.h
__gnu_cxx::distance
void distance(_InputIterator __first, _InputIterator __last, _Distance &__n)
Definition ext/iterator:105
std::__iterator_category
constexpr iterator_traits< _Iter >::iterator_category __iterator_category(const _Iter &)
Definition stl_iterator_base_types.h:239
__gnu_cxx
GNU extensions for public use.
iterator