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- // Temporary buffer implementation -*- C++ -*-
-
- // Copyright (C) 2001, 2002 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 __GLIBCPP_INTERNAL_TEMPBUF_H
- #define __GLIBCPP_INTERNAL_TEMPBUF_H
-
- 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 <class _ForwardIterator, class _Tp>
- class _Temporary_buffer
- {
- // concept requirements
- __glibcpp_class_requires(_ForwardIterator, _ForwardIteratorConcept)
-
- ptrdiff_t _M_original_len;
- ptrdiff_t _M_len;
- _Tp* _M_buffer;
-
- // this is basically get_temporary_buffer() all over again
- void _M_allocate_buffer() {
- _M_original_len = _M_len;
- _M_buffer = 0;
-
- if (_M_len > (ptrdiff_t)(INT_MAX / sizeof(_Tp)))
- _M_len = INT_MAX / sizeof(_Tp);
-
- while (_M_len > 0) {
- _M_buffer = (_Tp*) malloc(_M_len * sizeof(_Tp));
- if (_M_buffer)
- break;
- _M_len /= 2;
- }
- }
-
- void _M_initialize_buffer(const _Tp&, __true_type) {}
- void _M_initialize_buffer(const _Tp& val, __false_type) {
- uninitialized_fill_n(_M_buffer, _M_len, val);
- }
-
- public:
- /// As per Table mumble.
- ptrdiff_t size() const { return _M_len; }
- /// Returns the size requested by the constructor; may be >size().
- ptrdiff_t requested_size() const { return _M_original_len; }
- /// As per Table mumble.
- _Tp* begin() { return _M_buffer; }
- /// As per Table mumble.
- _Tp* end() { return _M_buffer + _M_len; }
-
- _Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) {
- // Workaround for a __type_traits bug in the pre-7.3 compiler.
- typedef typename __type_traits<_Tp>::has_trivial_default_constructor
- _Trivial;
-
- try {
- _M_len = distance(__first, __last);
- _M_allocate_buffer();
- if (_M_len > 0)
- _M_initialize_buffer(*__first, _Trivial());
- }
- catch(...)
- {
- free(_M_buffer);
- _M_buffer = 0;
- _M_len = 0;
- __throw_exception_again;
- }
- }
-
- ~_Temporary_buffer() {
- _Destroy(_M_buffer, _M_buffer + _M_len);
- free(_M_buffer);
- }
-
- private:
- // Disable copy constructor and assignment operator.
- _Temporary_buffer(const _Temporary_buffer&) {}
- void operator=(const _Temporary_buffer&) {}
- };
-
- } // namespace std
-
- #endif /* __GLIBCPP_INTERNAL_TEMPBUF_H */
-
-