198 lines
7.0 KiB
C++
198 lines
7.0 KiB
C++
// Memory extensions -*- C++ -*-
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// Copyright (C) 2002-2017 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*
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* Copyright (c) 1996
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file ext/memory
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* This file is a GNU extension to the Standard C++ Library (possibly
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* containing extensions from the HP/SGI STL subset).
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*/
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#ifndef _EXT_MEMORY
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#define _EXT_MEMORY 1
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#pragma GCC system_header
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#include <memory>
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#include <bits/stl_tempbuf.h>
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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using std::ptrdiff_t;
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using std::pair;
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using std::__iterator_category;
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using std::_Temporary_buffer;
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template<typename _InputIter, typename _Size, typename _ForwardIter>
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pair<_InputIter, _ForwardIter>
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__uninitialized_copy_n(_InputIter __first, _Size __count,
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_ForwardIter __result, std::input_iterator_tag)
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{
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_ForwardIter __cur = __result;
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__try
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{
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for (; __count > 0 ; --__count, ++__first, ++__cur)
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std::_Construct(&*__cur, *__first);
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return pair<_InputIter, _ForwardIter>(__first, __cur);
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}
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__catch(...)
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{
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std::_Destroy(__result, __cur);
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__throw_exception_again;
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}
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}
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template<typename _RandomAccessIter, typename _Size, typename _ForwardIter>
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inline pair<_RandomAccessIter, _ForwardIter>
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__uninitialized_copy_n(_RandomAccessIter __first, _Size __count,
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_ForwardIter __result,
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std::random_access_iterator_tag)
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{
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_RandomAccessIter __last = __first + __count;
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return (pair<_RandomAccessIter, _ForwardIter>
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(__last, std::uninitialized_copy(__first, __last, __result)));
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}
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template<typename _InputIter, typename _Size, typename _ForwardIter>
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inline pair<_InputIter, _ForwardIter>
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__uninitialized_copy_n(_InputIter __first, _Size __count,
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_ForwardIter __result)
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{ return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result,
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__iterator_category(__first)); }
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/**
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* @brief Copies the range [first,last) into result.
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* @param __first An input iterator.
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* @param __count Length
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* @param __result An output iterator.
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* @return __result + (__first + __count)
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* @ingroup SGIextensions
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*
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* Like copy(), but does not require an initialized output range.
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*/
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template<typename _InputIter, typename _Size, typename _ForwardIter>
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inline pair<_InputIter, _ForwardIter>
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uninitialized_copy_n(_InputIter __first, _Size __count,
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_ForwardIter __result)
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{ return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result,
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__iterator_category(__first)); }
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// An alternative version of uninitialized_copy_n that constructs
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// and destroys objects with a user-provided allocator.
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template<typename _InputIter, typename _Size, typename _ForwardIter,
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typename _Allocator>
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pair<_InputIter, _ForwardIter>
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__uninitialized_copy_n_a(_InputIter __first, _Size __count,
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_ForwardIter __result,
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_Allocator __alloc)
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{
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_ForwardIter __cur = __result;
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__try
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{
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for (; __count > 0 ; --__count, ++__first, ++__cur)
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__alloc.construct(&*__cur, *__first);
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return pair<_InputIter, _ForwardIter>(__first, __cur);
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}
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__catch(...)
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{
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std::_Destroy(__result, __cur, __alloc);
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__throw_exception_again;
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}
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}
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template<typename _InputIter, typename _Size, typename _ForwardIter,
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typename _Tp>
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inline pair<_InputIter, _ForwardIter>
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__uninitialized_copy_n_a(_InputIter __first, _Size __count,
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_ForwardIter __result,
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std::allocator<_Tp>)
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{
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return __gnu_cxx::uninitialized_copy_n(__first, __count, __result);
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}
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/**
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* This class provides similar behavior and semantics of the standard
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* functions get_temporary_buffer() and return_temporary_buffer(), but
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* encapsulated in a type vaguely resembling a standard container.
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*
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* By default, a temporary_buffer<Iter> stores space for objects of
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* whatever type the Iter iterator points to. It is constructed from a
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* typical [first,last) range, and provides the begin(), end(), size()
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* functions, as well as requested_size(). For non-trivial types, copies
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* of *first will be used to initialize the storage.
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*
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* @c malloc is used to obtain underlying storage.
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*
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* Like get_temporary_buffer(), not all the requested memory may be
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* available. Ideally, the created buffer will be large enough to hold a
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* copy of [first,last), but if size() is less than requested_size(),
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* then this didn't happen.
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*
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* @ingroup SGIextensions
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*/
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template <class _ForwardIterator, class _Tp
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= typename std::iterator_traits<_ForwardIterator>::value_type >
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struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp>
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{
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/// Requests storage large enough to hold a copy of [first,last).
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temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
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: _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) { }
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/// Destroys objects and frees storage.
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~temporary_buffer() { }
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};
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif
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