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// 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 */
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