memory revision 132720
1// Memory extensions -*- C++ -*- 2 3// Copyright (C) 2002 Free Software Foundation, Inc. 4// 5// This file is part of the GNU ISO C++ Library. This library is free 6// software; you can redistribute it and/or modify it under the 7// terms of the GNU General Public License as published by the 8// Free Software Foundation; either version 2, or (at your option) 9// any later version. 10 11// This library is distributed in the hope that it will be useful, 12// but WITHOUT ANY WARRANTY; without even the implied warranty of 13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14// GNU General Public License for more details. 15 16// You should have received a copy of the GNU General Public License along 17// with this library; see the file COPYING. If not, write to the Free 18// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 19// USA. 20 21// As a special exception, you may use this file as part of a free software 22// library without restriction. Specifically, if other files instantiate 23// templates or use macros or inline functions from this file, or you compile 24// this file and link it with other files to produce an executable, this 25// file does not by itself cause the resulting executable to be covered by 26// the GNU General Public License. This exception does not however 27// invalidate any other reasons why the executable file might be covered by 28// the GNU General Public License. 29 30/* 31 * 32 * Copyright (c) 1994 33 * Hewlett-Packard Company 34 * 35 * Permission to use, copy, modify, distribute and sell this software 36 * and its documentation for any purpose is hereby granted without fee, 37 * provided that the above copyright notice appear in all copies and 38 * that both that copyright notice and this permission notice appear 39 * in supporting documentation. Hewlett-Packard Company makes no 40 * representations about the suitability of this software for any 41 * purpose. It is provided "as is" without express or implied warranty. 42 * 43 * 44 * Copyright (c) 1996 45 * Silicon Graphics Computer Systems, Inc. 46 * 47 * Permission to use, copy, modify, distribute and sell this software 48 * and its documentation for any purpose is hereby granted without fee, 49 * provided that the above copyright notice appear in all copies and 50 * that both that copyright notice and this permission notice appear 51 * in supporting documentation. Silicon Graphics makes no 52 * representations about the suitability of this software for any 53 * purpose. It is provided "as is" without express or implied warranty. 54 */ 55 56/** @file ext/memory 57 * This file is a GNU extension to the Standard C++ Library (possibly 58 * containing extensions from the HP/SGI STL subset). You should only 59 * include this header if you are using GCC 3 or later. 60 */ 61 62#ifndef _EXT_MEMORY 63#define _EXT_MEMORY 1 64 65#pragma GCC system_header 66 67#include <memory> 68#include <bits/stl_tempbuf.h> 69 70namespace __gnu_cxx 71{ 72 using std::ptrdiff_t; 73 using std::pair; 74 using std::__iterator_category; 75 using std::_Temporary_buffer; 76 77 template<typename _InputIter, typename _Size, typename _ForwardIter> 78 pair<_InputIter, _ForwardIter> 79 __uninitialized_copy_n(_InputIter __first, _Size __count, 80 _ForwardIter __result, std::input_iterator_tag) 81 { 82 _ForwardIter __cur = __result; 83 try 84 { 85 for ( ; __count > 0 ; --__count, ++__first, ++__cur) 86 std::_Construct(&*__cur, *__first); 87 return pair<_InputIter, _ForwardIter>(__first, __cur); 88 } 89 catch(...) 90 { 91 std::_Destroy(__result, __cur); 92 __throw_exception_again; 93 } 94 } 95 96 template<typename _RandomAccessIter, typename _Size, typename _ForwardIter> 97 inline pair<_RandomAccessIter, _ForwardIter> 98 __uninitialized_copy_n(_RandomAccessIter __first, _Size __count, 99 _ForwardIter __result, 100 std::random_access_iterator_tag) 101 { 102 _RandomAccessIter __last = __first + __count; 103 return pair<_RandomAccessIter, _ForwardIter>( 104 __last, 105 std::uninitialized_copy(__first, __last, __result)); 106 } 107 108 template<typename _InputIter, typename _Size, typename _ForwardIter> 109 inline pair<_InputIter, _ForwardIter> 110 __uninitialized_copy_n(_InputIter __first, _Size __count, 111 _ForwardIter __result) 112 { 113 return __uninitialized_copy_n(__first, __count, __result, 114 __iterator_category(__first)); 115 } 116 117 /** 118 * @brief Copies the range [first,last) into result. 119 * @param first An input iterator. 120 * @param last An input iterator. 121 * @param result An output iterator. 122 * @return result + (first - last) 123 * @ingroup SGIextensions 124 * 125 * Like copy(), but does not require an initialized output range. 126 */ 127 template<typename _InputIter, typename _Size, typename _ForwardIter> 128 inline pair<_InputIter, _ForwardIter> 129 uninitialized_copy_n(_InputIter __first, _Size __count, 130 _ForwardIter __result) 131 { 132 return __uninitialized_copy_n(__first, __count, __result, 133 __iterator_category(__first)); 134 } 135 136 137 /** 138 * This class provides similar behavior and semantics of the standard 139 * functions get_temporary_buffer() and return_temporary_buffer(), but 140 * encapsulated in a type vaguely resembling a standard container. 141 * 142 * By default, a temporary_buffer<Iter> stores space for objects of 143 * whatever type the Iter iterator points to. It is constructed from a 144 * typical [first,last) range, and provides the begin(), end(), size() 145 * functions, as well as requested_size(). For non-trivial types, copies 146 * of *first will be used to initialize the storage. 147 * 148 * @c malloc is used to obtain underlying storage. 149 * 150 * Like get_temporary_buffer(), not all the requested memory may be 151 * available. Ideally, the created buffer will be large enough to hold a 152 * copy of [first,last), but if size() is less than requested_size(), 153 * then this didn't happen. 154 * 155 * @ingroup SGIextensions 156 */ 157 template <class _ForwardIterator, class _Tp 158 = typename std::iterator_traits<_ForwardIterator>::value_type > 159 struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp> 160 { 161 /// Requests storage large enough to hold a copy of [first,last). 162 temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) 163 : _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) { } 164 165 /// Destroys objects and frees storage. 166 ~temporary_buffer() { } 167 }; 168} // namespace __gnu_cxx 169 170#endif 171 172