1 // Temporary buffer implementation -*- C++ -*-
3 // Copyright (C) 2001 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 2, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING. If not, write to the Free
18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
33 * Hewlett-Packard Company
35 * Permission to use, copy, modify, distribute and sell this software
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41 * purpose. It is provided "as is" without express or implied warranty.
44 * Copyright (c) 1996,1997
45 * Silicon Graphics Computer Systems, Inc.
47 * Permission to use, copy, modify, distribute and sell this software
48 * and its documentation for any purpose is hereby granted without fee,
49 * provided that the above copyright notice appear in all copies and
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56 /** @file stl_tempbuf.h
57 * This is an internal header file, included by other library headers.
58 * You should not attempt to use it directly.
61 #ifndef __GLIBCPP_INTERNAL_TEMPBUF_H
62 #define __GLIBCPP_INTERNAL_TEMPBUF_H
69 __get_temporary_buffer(ptrdiff_t __len
, _Tp
*)
71 if (__len
> ptrdiff_t(INT_MAX
/ sizeof(_Tp
)))
72 __len
= INT_MAX
/ sizeof(_Tp
);
75 _Tp
* __tmp
= (_Tp
*) malloc((size_t)__len
* sizeof(_Tp
));
77 return pair
<_Tp
*, ptrdiff_t>(__tmp
, __len
);
81 return pair
<_Tp
*, ptrdiff_t>((_Tp
*)0, 0);
85 * This is a mostly-useless wrapper around malloc().
88 inline pair
<_Tp
*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len
) {
89 return __get_temporary_buffer(__len
, (_Tp
*) 0);
93 * The companion to get_temporary_buffer().
96 void return_temporary_buffer(_Tp
* __p
) {
101 template <class _ForwardIterator
, class _Tp
>
102 class _Temporary_buffer
{
104 ptrdiff_t _M_original_len
;
108 void _M_allocate_buffer() {
109 _M_original_len
= _M_len
;
112 if (_M_len
> (ptrdiff_t)(INT_MAX
/ sizeof(_Tp
)))
113 _M_len
= INT_MAX
/ sizeof(_Tp
);
116 _M_buffer
= (_Tp
*) malloc(_M_len
* sizeof(_Tp
));
123 void _M_initialize_buffer(const _Tp
&, __true_type
) {}
124 void _M_initialize_buffer(const _Tp
& val
, __false_type
) {
125 uninitialized_fill_n(_M_buffer
, _M_len
, val
);
129 ptrdiff_t size() const { return _M_len
; }
130 ptrdiff_t requested_size() const { return _M_original_len
; }
131 _Tp
* begin() { return _M_buffer
; }
132 _Tp
* end() { return _M_buffer
+ _M_len
; }
134 _Temporary_buffer(_ForwardIterator __first
, _ForwardIterator __last
) {
135 // Workaround for a __type_traits bug in the pre-7.3 compiler.
136 typedef typename __type_traits
<_Tp
>::has_trivial_default_constructor
141 distance(__first
, __last
, _M_len
);
142 _M_allocate_buffer();
144 _M_initialize_buffer(*__first
, _Trivial());
151 __throw_exception_again
;
155 ~_Temporary_buffer() {
156 _Destroy(_M_buffer
, _M_buffer
+ _M_len
);
161 // Disable copy constructor and assignment operator.
162 _Temporary_buffer(const _Temporary_buffer
&) {}
163 void operator=(const _Temporary_buffer
&) {}
166 // Class temporary_buffer is not part of the standard. It is an extension.
168 template <class _ForwardIterator
,
170 = typename iterator_traits
<_ForwardIterator
>::value_type
172 struct temporary_buffer
: public _Temporary_buffer
<_ForwardIterator
, _Tp
>
174 temporary_buffer(_ForwardIterator __first
, _ForwardIterator __last
)
175 : _Temporary_buffer
<_ForwardIterator
, _Tp
>(__first
, __last
) {}
176 ~temporary_buffer() {}
181 #endif /* __GLIBCPP_INTERNAL_TEMPBUF_H */