ext/memory
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// Memory extensions -*- C++ -*-
// Copyright (C) 2002-2022 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
* 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/memory
* This file is a GNU extension to the Standard C++ Library (possibly
* containing extensions from the HP/SGI STL subset).
*/
#ifndef _EXT_MEMORY
#define _EXT_MEMORY 1
#pragma GCC system_header
#include <memory>
#include <bits/stl_tempbuf.h>
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
using std::_Temporary_buffer;
template<typename _InputIter, typename _Size, typename _ForwardIter>
std::pair<_InputIter, _ForwardIter>
__uninitialized_copy_n(_InputIter __first, _Size __count,
_ForwardIter __result, std::input_iterator_tag)
{
_ForwardIter __cur = __result;
__try
{
for (; __count > 0 ; --__count, ++__first, ++__cur)
std::_Construct(&*__cur, *__first);
return std::pair<_InputIter, _ForwardIter>(__first, __cur);
}
__catch(...)
{
std::_Destroy(__result, __cur);
__throw_exception_again;
}
}
template<typename _RandomAccessIter, typename _Size, typename _ForwardIter>
inline std::pair<_RandomAccessIter, _ForwardIter>
__uninitialized_copy_n(_RandomAccessIter __first, _Size __count,
_ForwardIter __result,
std::random_access_iterator_tag)
{
_RandomAccessIter __last = __first + __count;
return (std::pair<_RandomAccessIter, _ForwardIter>
(__last, std::uninitialized_copy(__first, __last, __result)));
}
template<typename _InputIter, typename _Size, typename _ForwardIter>
inline std::pair<_InputIter, _ForwardIter>
__uninitialized_copy_n(_InputIter __first, _Size __count,
_ForwardIter __result)
{
return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result,
std::__iterator_category(__first));
}
/**
* @brief Copies the range [first,last) into result.
* @param __first An input iterator.
* @param __count Length
* @param __result An output iterator.
* @return __result + (__first + __count)
* @ingroup SGIextensions
*
* Like copy(), but does not require an initialized output range.
*/
template<typename _InputIter, typename _Size, typename _ForwardIter>
inline std::pair<_InputIter, _ForwardIter>
uninitialized_copy_n(_InputIter __first, _Size __count,
_ForwardIter __result)
{
return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result,
std::__iterator_category(__first));
}
// An alternative version of uninitialized_copy_n that constructs
// and destroys objects with a user-provided allocator.
template<typename _InputIter, typename _Size, typename _ForwardIter,
typename _Allocator>
std::pair<_InputIter, _ForwardIter>
__uninitialized_copy_n_a(_InputIter __first, _Size __count,
_ForwardIter __result,
_Allocator __alloc)
{
_ForwardIter __cur = __result;
__try
{
for (; __count > 0 ; --__count, ++__first, ++__cur)
__alloc.construct(&*__cur, *__first);
return std::pair<_InputIter, _ForwardIter>(__first, __cur);
}
__catch(...)
{
std::_Destroy(__result, __cur, __alloc);
__throw_exception_again;
}
}
template<typename _InputIter, typename _Size, typename _ForwardIter,
typename _Tp>
inline std::pair<_InputIter, _ForwardIter>
__uninitialized_copy_n_a(_InputIter __first, _Size __count,
_ForwardIter __result,
std::allocator<_Tp>)
{
return __gnu_cxx::uninitialized_copy_n(__first, __count, __result);
}
/**
* This class provides similar behavior and semantics of the standard
* functions get_temporary_buffer() and return_temporary_buffer(), but
* encapsulated in a type vaguely resembling a standard container.
*
* By default, a temporary_buffer<Iter> stores space for objects of
* whatever type the Iter iterator points to. It is constructed from a
* typical [first,last) range, and provides the begin(), end(), size()
* functions, as well as requested_size(). For non-trivial types, copies
* of *first will be used to initialize the storage.
*
* @c malloc is used to obtain underlying storage.
*
* Like get_temporary_buffer(), not all the requested memory may be
* available. Ideally, the created buffer will be large enough to hold a
* copy of [first,last), but if size() is less than requested_size(),
* then this didn't happen.
*
* @ingroup SGIextensions
*/
template <class _ForwardIterator, class _Tp
= typename std::iterator_traits<_ForwardIterator>::value_type >
struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp>
{
/// Requests storage large enough to hold a copy of [first,last).
temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
: _Temporary_buffer<_ForwardIterator, _Tp>(__first,
std::distance(__first, __last))
{ }
/// Destroys objects and frees storage.
~temporary_buffer() { }
};
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif