00001 // Temporary buffer implementation -*- C++ -*- 00002 00003 // Copyright (C) 2001, 2002, 2004, 2005 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 2, 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 // You should have received a copy of the GNU General Public License along 00017 // with this library; see the file COPYING. If not, write to the Free 00018 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 00019 // USA. 00020 00021 // As a special exception, you may use this file as part of a free software 00022 // library without restriction. Specifically, if other files instantiate 00023 // templates or use macros or inline functions from this file, or you compile 00024 // this file and link it with other files to produce an executable, this 00025 // file does not by itself cause the resulting executable to be covered by 00026 // the GNU General Public License. This exception does not however 00027 // invalidate any other reasons why the executable file might be covered by 00028 // the GNU General Public License. 00029 00030 /* 00031 * 00032 * Copyright (c) 1994 00033 * Hewlett-Packard Company 00034 * 00035 * Permission to use, copy, modify, distribute and sell this software 00036 * and its documentation for any purpose is hereby granted without fee, 00037 * provided that the above copyright notice appear in all copies and 00038 * that both that copyright notice and this permission notice appear 00039 * in supporting documentation. Hewlett-Packard Company makes no 00040 * representations about the suitability of this software for any 00041 * purpose. It is provided "as is" without express or implied warranty. 00042 * 00043 * 00044 * Copyright (c) 1996,1997 00045 * Silicon Graphics Computer Systems, Inc. 00046 * 00047 * Permission to use, copy, modify, distribute and sell this software 00048 * and its documentation for any purpose is hereby granted without fee, 00049 * provided that the above copyright notice appear in all copies and 00050 * that both that copyright notice and this permission notice appear 00051 * in supporting documentation. Silicon Graphics makes no 00052 * representations about the suitability of this software for any 00053 * purpose. It is provided "as is" without express or implied warranty. 00054 */ 00055 00061 #ifndef _TEMPBUF_H 00062 #define _TEMPBUF_H 1 00063 00064 #include <memory> 00065 00066 namespace std 00067 { 00075 template<typename _ForwardIterator, typename _Tp> 00076 class _Temporary_buffer 00077 { 00078 // concept requirements 00079 __glibcxx_class_requires(_ForwardIterator, _ForwardIteratorConcept) 00080 00081 public: 00082 typedef _Tp value_type; 00083 typedef value_type* pointer; 00084 typedef pointer iterator; 00085 typedef ptrdiff_t size_type; 00086 00087 protected: 00088 size_type _M_original_len; 00089 size_type _M_len; 00090 pointer _M_buffer; 00091 00092 void 00093 _M_initialize_buffer(const _Tp&, __true_type) { } 00094 00095 void 00096 _M_initialize_buffer(const _Tp& val, __false_type) 00097 { std::uninitialized_fill_n(_M_buffer, _M_len, val); } 00098 00099 public: 00101 size_type 00102 size() const 00103 { return _M_len; } 00104 00106 size_type 00107 requested_size() const 00108 { return _M_original_len; } 00109 00111 iterator 00112 begin() 00113 { return _M_buffer; } 00114 00116 iterator 00117 end() 00118 { return _M_buffer + _M_len; } 00119 00124 _Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last); 00125 00126 ~_Temporary_buffer() 00127 { 00128 std::_Destroy(_M_buffer, _M_buffer + _M_len); 00129 std::return_temporary_buffer(_M_buffer); 00130 } 00131 00132 private: 00133 // Disable copy constructor and assignment operator. 00134 _Temporary_buffer(const _Temporary_buffer&); 00135 00136 void 00137 operator=(const _Temporary_buffer&); 00138 }; 00139 00140 00141 template<typename _ForwardIterator, typename _Tp> 00142 _Temporary_buffer<_ForwardIterator, _Tp>:: 00143 _Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) 00144 : _M_original_len(std::distance(__first, __last)), 00145 _M_len(0), _M_buffer(0) 00146 { 00147 // Workaround for a __type_traits bug in the pre-7.3 compiler. 00148 typedef typename std::__is_scalar<_Tp>::__type _Trivial; 00149 00150 try 00151 { 00152 pair<pointer, size_type> __p(get_temporary_buffer< 00153 value_type>(_M_original_len)); 00154 _M_buffer = __p.first; 00155 _M_len = __p.second; 00156 if (_M_len > 0) 00157 _M_initialize_buffer(*__first, _Trivial()); 00158 } 00159 catch(...) 00160 { 00161 std::return_temporary_buffer(_M_buffer); 00162 _M_buffer = 0; 00163 _M_len = 0; 00164 __throw_exception_again; 00165 } 00166 } 00167 } // namespace std 00168 00169 #endif /* _TEMPBUF_H */ 00170