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Diffstat (limited to 'libstdc++/include/bits/stl_tempbuf.h')
| -rw-r--r-- | libstdc++/include/bits/stl_tempbuf.h | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/libstdc++/include/bits/stl_tempbuf.h b/libstdc++/include/bits/stl_tempbuf.h new file mode 100644 index 0000000..fbe24e7 --- /dev/null +++ b/libstdc++/include/bits/stl_tempbuf.h @@ -0,0 +1,172 @@ +// Temporary buffer implementation -*- C++ -*- + +// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 +// 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, +// 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> + +_GLIBCXX_BEGIN_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; + } + } + +_GLIBCXX_END_NAMESPACE + +#endif /* _TEMPBUF_H */ + |
