/*
*
* 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.
*/
/* NOTE: This is an internal header file, included by other STL headers.
* You should not attempt to use it directly.
*/
#ifndef __SGI_STL_INTERNAL_ITERATOR_BASE_FUNCS_H
#define __SGI_STL_INTERNAL_ITERATOR_BASE_FUNCS_H
// This file contains all of the general iterator-related utility
// functions, such as distance() and advance().
// The internal file stl_iterator.h contains predefined iterators,
// such as front_insert_iterator and istream_iterator.
#pragma GCC system_header
#include <bits/concept_check.h>
namespace std
{
// 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 <class _InputIterator, class _Distance>
inline void __distance(_InputIterator __first, _InputIterator __last,
_Distance& __n, input_iterator_tag)
{
// concept requirements
__glibcpp_function_requires(_InputIteratorConcept<_InputIterator>);
while (__first != __last) { ++__first; ++__n; }
}
template <class _RandomAccessIterator, class _Distance>
inline void __distance(_RandomAccessIterator __first,
_RandomAccessIterator __last,
_Distance& __n, random_access_iterator_tag)
{
// concept requirements
__glibcpp_function_requires(_RandomAccessIteratorConcept<_RandomAccessIterator>);
__n += __last - __first;
}
template <class _InputIterator, class _Distance>
inline void distance(_InputIterator __first,
_InputIterator __last, _Distance& __n)
{
// concept requirements -- taken care of in __distance
__distance(__first, __last, __n, iterator_category(__first));
}
template <class _InputIterator>
inline typename iterator_traits<_InputIterator>::difference_type
__distance(_InputIterator __first, _InputIterator __last, input_iterator_tag)
{
// concept requirements
__glibcpp_function_requires(_InputIteratorConcept<_InputIterator>);
typename iterator_traits<_InputIterator>::difference_type __n = 0;
while (__first != __last) {
++__first; ++__n;
}
return __n;
}
template <class _RandomAccessIterator>
inline typename iterator_traits<_RandomAccessIterator>::difference_type
__distance(_RandomAccessIterator __first, _RandomAccessIterator __last,
random_access_iterator_tag)
{
// concept requirements
__glibcpp_function_requires(_RandomAccessIteratorConcept<_RandomAccessIterator>);
return __last - __first;
}
template <class _InputIterator>
inline typename iterator_traits<_InputIterator>::difference_type
distance(_InputIterator __first, _InputIterator __last)
{
// concept requirements -- taken care of in __distance
typedef typename iterator_traits<_InputIterator>::iterator_category
_Category;
return __distance(__first, __last, _Category());
}
template <class _InputIter, class _Distance>
inline void __advance(_InputIter& __i, _Distance __n, input_iterator_tag)
{
// concept requirements
__glibcpp_function_requires(_InputIteratorConcept<_InputIter>);
while (__n--) ++__i;
}
template <class _BidirectionalIterator, class _Distance>
inline void __advance(_BidirectionalIterator& __i, _Distance __n,
bidirectional_iterator_tag)
{
// concept requirements
__glibcpp_function_requires(_BidirectionalIteratorConcept<_BidirectionalIterator>);
if (__n > 0)
while (__n--) ++__i;
else
while (__n++) --__i;
}
template <class _RandomAccessIterator, class _Distance>
inline void __advance(_RandomAccessIterator& __i, _Distance __n,
random_access_iterator_tag)
{
// concept requirements
__glibcpp_function_requires(_RandomAccessIteratorConcept<_RandomAccessIterator>);
__i += __n;
}
template <class _InputIterator, class _Distance>
inline void advance(_InputIterator& __i, _Distance __n)
{
// concept requirements -- taken care of in __advance
__advance(__i, __n, iterator_category(__i));
}
} // namespace std
#endif /* __SGI_STL_INTERNAL_ITERATOR_BASE_FUNCS_H */
// Local Variables:
// mode:C++
// End: