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// Temporary buffer implementation -*- C++ -*-
// Copyright (C) 2001 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.
*/
/* NOTE: This is an internal header file, included by other STL headers.
* You should not attempt to use it directly.
*/
#ifndef __SGI_STL_INTERNAL_TEMPBUF_H
#define __SGI_STL_INTERNAL_TEMPBUF_H
namespace std
{
template <class _Tp>
pair<_Tp*, ptrdiff_t>
__get_temporary_buffer(ptrdiff_t __len, _Tp*)
{
if (__len > ptrdiff_t(INT_MAX / sizeof(_Tp)))
__len = INT_MAX / sizeof(_Tp);
while (__len > 0) {
_Tp* __tmp = (_Tp*) malloc((size_t)__len * sizeof(_Tp));
if (__tmp != 0)
return pair<_Tp*, ptrdiff_t>(__tmp, __len);
__len /= 2;
}
return pair<_Tp*, ptrdiff_t>((_Tp*)0, 0);
}
template <class _Tp>
inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len) {
return __get_temporary_buffer(__len, (_Tp*) 0);
}
// This overload is not required by the standard; it is an extension.
// It is supported for backward compatibility with the HP STL, and
// because not all compilers support the language feature (explicit
// function template arguments) that is required for the standard
// version of get_temporary_buffer.
template <class _Tp>
inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len, _Tp*) {
return __get_temporary_buffer(__len, (_Tp*) 0);
}
template <class _Tp>
void return_temporary_buffer(_Tp* __p) {
free(__p);
}
template <class _ForwardIterator, class _Tp>
class _Temporary_buffer {
private:
ptrdiff_t _M_original_len;
ptrdiff_t _M_len;
_Tp* _M_buffer;
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:
ptrdiff_t size() const { return _M_len; }
ptrdiff_t requested_size() const { return _M_original_len; }
_Tp* begin() { return _M_buffer; }
_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;
__STL_TRY {
_M_len = 0;
distance(__first, __last, _M_len);
_M_allocate_buffer();
if (_M_len > 0)
_M_initialize_buffer(*__first, _Trivial());
}
__STL_UNWIND(free(_M_buffer); _M_buffer = 0; _M_len = 0);
}
~_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&) {}
};
// Class temporary_buffer is not part of the standard. It is an extension.
template <class _ForwardIterator,
class _Tp
= typename iterator_traits<_ForwardIterator>::value_type
>
struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp>
{
temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
: _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) {}
~temporary_buffer() {}
};
} // namespace std
#endif /* __SGI_STL_INTERNAL_TEMPBUF_H */
// Local Variables:
// mode:C++
// End:
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