150 lines
4.8 KiB
C++
150 lines
4.8 KiB
C++
// 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 */
|
|
|