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