// Temporary buffer implementation -*- C++ -*- // Copyright (C) 2001, 2002, 2004, 2005 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 2, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License along // with this library; see the file COPYING. If not, write to the Free // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, // USA. // As a special exception, you may use this file as part of a free software // library without restriction. Specifically, if other files instantiate // templates or use macros or inline functions from this file, or you compile // this file and link it with other files to produce an executable, this // file does not by itself cause the resulting executable to be covered by // the GNU General Public License. This exception does not however // invalidate any other reasons why the executable file might be covered by // the GNU General Public License. /* * * Copyright (c) 1994 * Hewlett-Packard Company * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Hewlett-Packard Company makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. * * * Copyright (c) 1996,1997 * Silicon Graphics Computer Systems, Inc. * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Silicon Graphics makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. */ /** @file stl_tempbuf.h * This is an internal header file, included by other library headers. * You should not attempt to use it directly. */ #ifndef _TEMPBUF_H #define _TEMPBUF_H 1 #include <memory> namespace std { /** * @if maint * This class is used in two places: stl_algo.h and ext/memory, * where it is wrapped as the temporary_buffer class. See * temporary_buffer docs for more notes. * @endif */ template<typename _ForwardIterator, typename _Tp> class _Temporary_buffer { // concept requirements __glibcxx_class_requires(_ForwardIterator, _ForwardIteratorConcept) public: typedef _Tp value_type; typedef value_type* pointer; typedef pointer iterator; typedef ptrdiff_t size_type; protected: size_type _M_original_len; size_type _M_len; pointer _M_buffer; void _M_initialize_buffer(const _Tp&, __true_type) { } void _M_initialize_buffer(const _Tp& val, __false_type) { std::uninitialized_fill_n(_M_buffer, _M_len, val); } public: /// As per Table mumble. size_type size() const { return _M_len; } /// Returns the size requested by the constructor; may be >size(). size_type requested_size() const { return _M_original_len; } /// As per Table mumble. iterator begin() { return _M_buffer; } /// As per Table mumble. iterator end() { return _M_buffer + _M_len; } /** * Constructs a temporary buffer of a size somewhere between * zero and the size of the given range. */ _Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last); ~_Temporary_buffer() { std::_Destroy(_M_buffer, _M_buffer + _M_len); std::return_temporary_buffer(_M_buffer); } private: // Disable copy constructor and assignment operator. _Temporary_buffer(const _Temporary_buffer&); void operator=(const _Temporary_buffer&); }; template<typename _ForwardIterator, typename _Tp> _Temporary_buffer<_ForwardIterator, _Tp>:: _Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) : _M_original_len(std::distance(__first, __last)), _M_len(0), _M_buffer(0) { // Workaround for a __type_traits bug in the pre-7.3 compiler. typedef typename std::__is_scalar<_Tp>::__type _Trivial; try { pair<pointer, size_type> __p(get_temporary_buffer< value_type>(_M_original_len)); _M_buffer = __p.first; _M_len = __p.second; if (_M_len > 0) _M_initialize_buffer(*__first, _Trivial()); } catch(...) { std::return_temporary_buffer(_M_buffer); _M_buffer = 0; _M_len = 0; __throw_exception_again; } } } // namespace std #endif /* _TEMPBUF_H */