1 // Memory extensions -*- C++ -*- 2 3 // Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 4 // Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 3, or (at your option) 10 // any later version. 11 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 17 // Under Section 7 of GPL version 3, you are granted additional 18 // permissions described in the GCC Runtime Library Exception, version 19 // 3.1, as published by the Free Software Foundation. 20 21 // You should have received a copy of the GNU General Public License and 22 // a copy of the GCC Runtime Library Exception along with this program; 23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 // <http://www.gnu.org/licenses/>. 25 26 /* 27 * 28 * Copyright (c) 1994 29 * Hewlett-Packard Company 30 * 31 * Permission to use, copy, modify, distribute and sell this software 32 * and its documentation for any purpose is hereby granted without fee, 33 * provided that the above copyright notice appear in all copies and 34 * that both that copyright notice and this permission notice appear 35 * in supporting documentation. Hewlett-Packard Company makes no 36 * representations about the suitability of this software for any 37 * purpose. It is provided "as is" without express or implied warranty. 38 * 39 * 40 * Copyright (c) 1996 41 * Silicon Graphics Computer Systems, Inc. 42 * 43 * Permission to use, copy, modify, distribute and sell this software 44 * and its documentation for any purpose is hereby granted without fee, 45 * provided that the above copyright notice appear in all copies and 46 * that both that copyright notice and this permission notice appear 47 * in supporting documentation. Silicon Graphics makes no 48 * representations about the suitability of this software for any 49 * purpose. It is provided "as is" without express or implied warranty. 50 */ 51 52 /** @file ext/memory 53 * This file is a GNU extension to the Standard C++ Library (possibly 54 * containing extensions from the HP/SGI STL subset). 55 */ 56 57 #ifndef _EXT_MEMORY 58 #define _EXT_MEMORY 1 59 60 #pragma GCC system_header 61 62 #include <memory> 63 #include <bits/stl_tempbuf.h> 64 65 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 66 { 67 _GLIBCXX_BEGIN_NAMESPACE_VERSION 68 69 using std::ptrdiff_t; 70 using std::pair; 71 using std::__iterator_category; 72 using std::_Temporary_buffer; 73 74 template<typename _InputIter, typename _Size, typename _ForwardIter> 75 pair<_InputIter, _ForwardIter> 76 __uninitialized_copy_n(_InputIter __first, _Size __count, 77 _ForwardIter __result, std::input_iterator_tag) 78 { 79 _ForwardIter __cur = __result; 80 __try 81 { 82 for (; __count > 0 ; --__count, ++__first, ++__cur) 83 std::_Construct(&*__cur, *__first); 84 return pair<_InputIter, _ForwardIter>(__first, __cur); 85 } 86 __catch(...) 87 { 88 std::_Destroy(__result, __cur); 89 __throw_exception_again; 90 } 91 } 92 93 template<typename _RandomAccessIter, typename _Size, typename _ForwardIter> 94 inline pair<_RandomAccessIter, _ForwardIter> 95 __uninitialized_copy_n(_RandomAccessIter __first, _Size __count, 96 _ForwardIter __result, 97 std::random_access_iterator_tag) 98 { 99 _RandomAccessIter __last = __first + __count; 100 return (pair<_RandomAccessIter, _ForwardIter> 101 (__last, std::uninitialized_copy(__first, __last, __result))); 102 } 103 104 template<typename _InputIter, typename _Size, typename _ForwardIter> 105 inline pair<_InputIter, _ForwardIter> 106 __uninitialized_copy_n(_InputIter __first, _Size __count, 107 _ForwardIter __result) 108 { return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result, 109 __iterator_category(__first)); } 110 111 /** 112 * @brief Copies the range [first,last) into result. 113 * @param first An input iterator. 114 * @param last An input iterator. 115 * @param result An output iterator. 116 * @return result + (first - last) 117 * @ingroup SGIextensions 118 * 119 * Like copy(), but does not require an initialized output range. 120 */ 121 template<typename _InputIter, typename _Size, typename _ForwardIter> 122 inline pair<_InputIter, _ForwardIter> 123 uninitialized_copy_n(_InputIter __first, _Size __count, 124 _ForwardIter __result) 125 { return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result, 126 __iterator_category(__first)); } 127 128 129 // An alternative version of uninitialized_copy_n that constructs 130 // and destroys objects with a user-provided allocator. 131 template<typename _InputIter, typename _Size, typename _ForwardIter, 132 typename _Allocator> 133 pair<_InputIter, _ForwardIter> 134 __uninitialized_copy_n_a(_InputIter __first, _Size __count, 135 _ForwardIter __result, 136 _Allocator __alloc) 137 { 138 _ForwardIter __cur = __result; 139 __try 140 { 141 for (; __count > 0 ; --__count, ++__first, ++__cur) 142 __alloc.construct(&*__cur, *__first); 143 return pair<_InputIter, _ForwardIter>(__first, __cur); 144 } 145 __catch(...) 146 { 147 std::_Destroy(__result, __cur, __alloc); 148 __throw_exception_again; 149 } 150 } 151 152 template<typename _InputIter, typename _Size, typename _ForwardIter, 153 typename _Tp> 154 inline pair<_InputIter, _ForwardIter> 155 __uninitialized_copy_n_a(_InputIter __first, _Size __count, 156 _ForwardIter __result, 157 std::allocator<_Tp>) 158 { 159 return __gnu_cxx::uninitialized_copy_n(__first, __count, __result); 160 } 161 162 /** 163 * This class provides similar behavior and semantics of the standard 164 * functions get_temporary_buffer() and return_temporary_buffer(), but 165 * encapsulated in a type vaguely resembling a standard container. 166 * 167 * By default, a temporary_buffer<Iter> stores space for objects of 168 * whatever type the Iter iterator points to. It is constructed from a 169 * typical [first,last) range, and provides the begin(), end(), size() 170 * functions, as well as requested_size(). For non-trivial types, copies 171 * of *first will be used to initialize the storage. 172 * 173 * @c malloc is used to obtain underlying storage. 174 * 175 * Like get_temporary_buffer(), not all the requested memory may be 176 * available. Ideally, the created buffer will be large enough to hold a 177 * copy of [first,last), but if size() is less than requested_size(), 178 * then this didn't happen. 179 * 180 * @ingroup SGIextensions 181 */ 182 template <class _ForwardIterator, class _Tp 183 = typename std::iterator_traits<_ForwardIterator>::value_type > 184 struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp> 185 { 186 /// Requests storage large enough to hold a copy of [first,last). 187 temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) 188 : _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) { } 189 190 /// Destroys objects and frees storage. 191 ~temporary_buffer() { } 192 }; 193 194 _GLIBCXX_END_NAMESPACE_VERSION 195 } // namespace 196 197 #endif 198 199
