1// Memory extensions -*- C++ -*- 2 3// Copyright (C) 2002-2018 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 3, 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// Under Section 7 of GPL version 3, you are granted additional 17// permissions described in the GCC Runtime Library Exception, version 18// 3.1, as published by the Free Software Foundation. 19 20// You should have received a copy of the GNU General Public License and 21// a copy of the GCC Runtime Library Exception along with this program; 22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23// <http://www.gnu.org/licenses/>. 24 25/* 26 * 27 * Copyright (c) 1994 28 * Hewlett-Packard Company 29 * 30 * Permission to use, copy, modify, distribute and sell this software 31 * and its documentation for any purpose is hereby granted without fee, 32 * provided that the above copyright notice appear in all copies and 33 * that both that copyright notice and this permission notice appear 34 * in supporting documentation. Hewlett-Packard Company makes no 35 * representations about the suitability of this software for any 36 * purpose. It is provided "as is" without express or implied warranty. 37 * 38 * 39 * Copyright (c) 1996 40 * Silicon Graphics Computer Systems, Inc. 41 * 42 * Permission to use, copy, modify, distribute and sell this software 43 * and its documentation for any purpose is hereby granted without fee, 44 * provided that the above copyright notice appear in all copies and 45 * that both that copyright notice and this permission notice appear 46 * in supporting documentation. Silicon Graphics makes no 47 * representations about the suitability of this software for any 48 * purpose. It is provided "as is" without express or implied warranty. 49 */ 50 51/** @file ext/memory 52 * This file is a GNU extension to the Standard C++ Library (possibly 53 * containing extensions from the HP/SGI STL subset). 54 */ 55 56#ifndef _EXT_MEMORY 57#define _EXT_MEMORY 1 58 59#pragma GCC system_header 60 61#include <memory> 62#include <bits/stl_tempbuf.h> 63 64namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 65{ 66_GLIBCXX_BEGIN_NAMESPACE_VERSION 67 68 using std::ptrdiff_t; 69 using std::pair; 70 using std::__iterator_category; 71 using std::_Temporary_buffer; 72 73 template<typename _InputIter, typename _Size, typename _ForwardIter> 74 pair<_InputIter, _ForwardIter> 75 __uninitialized_copy_n(_InputIter __first, _Size __count, 76 _ForwardIter __result, std::input_iterator_tag) 77 { 78 _ForwardIter __cur = __result; 79 __try 80 { 81 for (; __count > 0 ; --__count, ++__first, ++__cur) 82 std::_Construct(&*__cur, *__first); 83 return pair<_InputIter, _ForwardIter>(__first, __cur); 84 } 85 __catch(...) 86 { 87 std::_Destroy(__result, __cur); 88 __throw_exception_again; 89 } 90 } 91 92 template<typename _RandomAccessIter, typename _Size, typename _ForwardIter> 93 inline pair<_RandomAccessIter, _ForwardIter> 94 __uninitialized_copy_n(_RandomAccessIter __first, _Size __count, 95 _ForwardIter __result, 96 std::random_access_iterator_tag) 97 { 98 _RandomAccessIter __last = __first + __count; 99 return (pair<_RandomAccessIter, _ForwardIter> 100 (__last, std::uninitialized_copy(__first, __last, __result))); 101 } 102 103 template<typename _InputIter, typename _Size, typename _ForwardIter> 104 inline pair<_InputIter, _ForwardIter> 105 __uninitialized_copy_n(_InputIter __first, _Size __count, 106 _ForwardIter __result) 107 { return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result, 108 __iterator_category(__first)); } 109 110 /** 111 * @brief Copies the range [first,last) into result. 112 * @param __first An input iterator. 113 * @param __count Length 114 * @param __result An output iterator. 115 * @return __result + (__first + __count) 116 * @ingroup SGIextensions 117 * 118 * Like copy(), but does not require an initialized output range. 119 */ 120 template<typename _InputIter, typename _Size, typename _ForwardIter> 121 inline pair<_InputIter, _ForwardIter> 122 uninitialized_copy_n(_InputIter __first, _Size __count, 123 _ForwardIter __result) 124 { return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result, 125 __iterator_category(__first)); } 126 127 128 // An alternative version of uninitialized_copy_n that constructs 129 // and destroys objects with a user-provided allocator. 130 template<typename _InputIter, typename _Size, typename _ForwardIter, 131 typename _Allocator> 132 pair<_InputIter, _ForwardIter> 133 __uninitialized_copy_n_a(_InputIter __first, _Size __count, 134 _ForwardIter __result, 135 _Allocator __alloc) 136 { 137 _ForwardIter __cur = __result; 138 __try 139 { 140 for (; __count > 0 ; --__count, ++__first, ++__cur) 141 __alloc.construct(&*__cur, *__first); 142 return pair<_InputIter, _ForwardIter>(__first, __cur); 143 } 144 __catch(...) 145 { 146 std::_Destroy(__result, __cur, __alloc); 147 __throw_exception_again; 148 } 149 } 150 151 template<typename _InputIter, typename _Size, typename _ForwardIter, 152 typename _Tp> 153 inline pair<_InputIter, _ForwardIter> 154 __uninitialized_copy_n_a(_InputIter __first, _Size __count, 155 _ForwardIter __result, 156 std::allocator<_Tp>) 157 { 158 return __gnu_cxx::uninitialized_copy_n(__first, __count, __result); 159 } 160 161 /** 162 * This class provides similar behavior and semantics of the standard 163 * functions get_temporary_buffer() and return_temporary_buffer(), but 164 * encapsulated in a type vaguely resembling a standard container. 165 * 166 * By default, a temporary_buffer<Iter> stores space for objects of 167 * whatever type the Iter iterator points to. It is constructed from a 168 * typical [first,last) range, and provides the begin(), end(), size() 169 * functions, as well as requested_size(). For non-trivial types, copies 170 * of *first will be used to initialize the storage. 171 * 172 * @c malloc is used to obtain underlying storage. 173 * 174 * Like get_temporary_buffer(), not all the requested memory may be 175 * available. Ideally, the created buffer will be large enough to hold a 176 * copy of [first,last), but if size() is less than requested_size(), 177 * then this didn't happen. 178 * 179 * @ingroup SGIextensions 180 */ 181 template <class _ForwardIterator, class _Tp 182 = typename std::iterator_traits<_ForwardIterator>::value_type > 183 struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp> 184 { 185 /// Requests storage large enough to hold a copy of [first,last). 186 temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) 187 : _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) { } 188 189 /// Destroys objects and frees storage. 190 ~temporary_buffer() { } 191 }; 192 193_GLIBCXX_END_NAMESPACE_VERSION 194} // namespace 195 196#endif 197 198