libstdc++
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00001 // Memory extensions -*- C++ -*- 00002 00003 // Copyright (C) 2002-2015 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 3, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /* 00026 * 00027 * Copyright (c) 1994 00028 * Hewlett-Packard Company 00029 * 00030 * Permission to use, copy, modify, distribute and sell this software 00031 * and its documentation for any purpose is hereby granted without fee, 00032 * provided that the above copyright notice appear in all copies and 00033 * that both that copyright notice and this permission notice appear 00034 * in supporting documentation. Hewlett-Packard Company makes no 00035 * representations about the suitability of this software for any 00036 * purpose. It is provided "as is" without express or implied warranty. 00037 * 00038 * 00039 * Copyright (c) 1996 00040 * Silicon Graphics Computer Systems, Inc. 00041 * 00042 * Permission to use, copy, modify, distribute and sell this software 00043 * and its documentation for any purpose is hereby granted without fee, 00044 * provided that the above copyright notice appear in all copies and 00045 * that both that copyright notice and this permission notice appear 00046 * in supporting documentation. Silicon Graphics makes no 00047 * representations about the suitability of this software for any 00048 * purpose. It is provided "as is" without express or implied warranty. 00049 */ 00050 00051 /** @file ext/memory 00052 * This file is a GNU extension to the Standard C++ Library (possibly 00053 * containing extensions from the HP/SGI STL subset). 00054 */ 00055 00056 #ifndef _EXT_MEMORY 00057 #define _EXT_MEMORY 1 00058 00059 #pragma GCC system_header 00060 00061 #include <memory> 00062 #include <bits/stl_tempbuf.h> 00063 00064 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 00065 { 00066 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00067 00068 using std::ptrdiff_t; 00069 using std::pair; 00070 using std::__iterator_category; 00071 using std::_Temporary_buffer; 00072 00073 template<typename _InputIter, typename _Size, typename _ForwardIter> 00074 pair<_InputIter, _ForwardIter> 00075 __uninitialized_copy_n(_InputIter __first, _Size __count, 00076 _ForwardIter __result, std::input_iterator_tag) 00077 { 00078 _ForwardIter __cur = __result; 00079 __try 00080 { 00081 for (; __count > 0 ; --__count, ++__first, ++__cur) 00082 std::_Construct(&*__cur, *__first); 00083 return pair<_InputIter, _ForwardIter>(__first, __cur); 00084 } 00085 __catch(...) 00086 { 00087 std::_Destroy(__result, __cur); 00088 __throw_exception_again; 00089 } 00090 } 00091 00092 template<typename _RandomAccessIter, typename _Size, typename _ForwardIter> 00093 inline pair<_RandomAccessIter, _ForwardIter> 00094 __uninitialized_copy_n(_RandomAccessIter __first, _Size __count, 00095 _ForwardIter __result, 00096 std::random_access_iterator_tag) 00097 { 00098 _RandomAccessIter __last = __first + __count; 00099 return (pair<_RandomAccessIter, _ForwardIter> 00100 (__last, std::uninitialized_copy(__first, __last, __result))); 00101 } 00102 00103 template<typename _InputIter, typename _Size, typename _ForwardIter> 00104 inline pair<_InputIter, _ForwardIter> 00105 __uninitialized_copy_n(_InputIter __first, _Size __count, 00106 _ForwardIter __result) 00107 { return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result, 00108 __iterator_category(__first)); } 00109 00110 /** 00111 * @brief Copies the range [first,last) into result. 00112 * @param __first An input iterator. 00113 * @param __count Length 00114 * @param __result An output iterator. 00115 * @return __result + (__first + __count) 00116 * @ingroup SGIextensions 00117 * 00118 * Like copy(), but does not require an initialized output range. 00119 */ 00120 template<typename _InputIter, typename _Size, typename _ForwardIter> 00121 inline pair<_InputIter, _ForwardIter> 00122 uninitialized_copy_n(_InputIter __first, _Size __count, 00123 _ForwardIter __result) 00124 { return __gnu_cxx::__uninitialized_copy_n(__first, __count, __result, 00125 __iterator_category(__first)); } 00126 00127 00128 // An alternative version of uninitialized_copy_n that constructs 00129 // and destroys objects with a user-provided allocator. 00130 template<typename _InputIter, typename _Size, typename _ForwardIter, 00131 typename _Allocator> 00132 pair<_InputIter, _ForwardIter> 00133 __uninitialized_copy_n_a(_InputIter __first, _Size __count, 00134 _ForwardIter __result, 00135 _Allocator __alloc) 00136 { 00137 _ForwardIter __cur = __result; 00138 __try 00139 { 00140 for (; __count > 0 ; --__count, ++__first, ++__cur) 00141 __alloc.construct(&*__cur, *__first); 00142 return pair<_InputIter, _ForwardIter>(__first, __cur); 00143 } 00144 __catch(...) 00145 { 00146 std::_Destroy(__result, __cur, __alloc); 00147 __throw_exception_again; 00148 } 00149 } 00150 00151 template<typename _InputIter, typename _Size, typename _ForwardIter, 00152 typename _Tp> 00153 inline pair<_InputIter, _ForwardIter> 00154 __uninitialized_copy_n_a(_InputIter __first, _Size __count, 00155 _ForwardIter __result, 00156 std::allocator<_Tp>) 00157 { 00158 return __gnu_cxx::uninitialized_copy_n(__first, __count, __result); 00159 } 00160 00161 /** 00162 * This class provides similar behavior and semantics of the standard 00163 * functions get_temporary_buffer() and return_temporary_buffer(), but 00164 * encapsulated in a type vaguely resembling a standard container. 00165 * 00166 * By default, a temporary_buffer<Iter> stores space for objects of 00167 * whatever type the Iter iterator points to. It is constructed from a 00168 * typical [first,last) range, and provides the begin(), end(), size() 00169 * functions, as well as requested_size(). For non-trivial types, copies 00170 * of *first will be used to initialize the storage. 00171 * 00172 * @c malloc is used to obtain underlying storage. 00173 * 00174 * Like get_temporary_buffer(), not all the requested memory may be 00175 * available. Ideally, the created buffer will be large enough to hold a 00176 * copy of [first,last), but if size() is less than requested_size(), 00177 * then this didn't happen. 00178 * 00179 * @ingroup SGIextensions 00180 */ 00181 template <class _ForwardIterator, class _Tp 00182 = typename std::iterator_traits<_ForwardIterator>::value_type > 00183 struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp> 00184 { 00185 /// Requests storage large enough to hold a copy of [first,last). 00186 temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) 00187 : _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) { } 00188 00189 /// Destroys objects and frees storage. 00190 ~temporary_buffer() { } 00191 }; 00192 00193 _GLIBCXX_END_NAMESPACE_VERSION 00194 } // namespace 00195 00196 #endif 00197