1 // Temporary buffer implementation -*- C++ -*-
3 // Copyright (C) 2001, 2002 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
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13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
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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
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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
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44 * Copyright (c) 1996,1997
45 * Silicon Graphics Computer Systems, Inc.
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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.
69 * This class is used in two places: stl_algo.h and ext/memory, where it
70 * is wrapped as the temporary_buffer class. See temporary_buffer docs for
74 template <class _ForwardIterator
, class _Tp
>
75 class _Temporary_buffer
77 // concept requirements
78 __glibcxx_class_requires(_ForwardIterator
, _ForwardIteratorConcept
)
80 ptrdiff_t _M_original_len
;
84 // this is basically get_temporary_buffer() all over again
85 void _M_allocate_buffer() {
86 _M_original_len
= _M_len
;
89 if (_M_len
> (ptrdiff_t)(INT_MAX
/ sizeof(_Tp
)))
90 _M_len
= INT_MAX
/ sizeof(_Tp
);
93 _M_buffer
= (_Tp
*) malloc(_M_len
* sizeof(_Tp
));
100 void _M_initialize_buffer(const _Tp
&, __true_type
) {}
101 void _M_initialize_buffer(const _Tp
& val
, __false_type
) {
102 std::uninitialized_fill_n(_M_buffer
, _M_len
, val
);
106 /// As per Table mumble.
107 ptrdiff_t size() const { return _M_len
; }
108 /// Returns the size requested by the constructor; may be >size().
109 ptrdiff_t requested_size() const { return _M_original_len
; }
110 /// As per Table mumble.
111 _Tp
* begin() { return _M_buffer
; }
112 /// As per Table mumble.
113 _Tp
* end() { return _M_buffer
+ _M_len
; }
115 _Temporary_buffer(_ForwardIterator __first
, _ForwardIterator __last
) {
116 // Workaround for a __type_traits bug in the pre-7.3 compiler.
117 typedef typename __type_traits
<_Tp
>::has_trivial_default_constructor
121 _M_len
= std::distance(__first
, __last
);
122 _M_allocate_buffer();
124 _M_initialize_buffer(*__first
, _Trivial());
131 __throw_exception_again
;
135 ~_Temporary_buffer() {
136 std::_Destroy(_M_buffer
, _M_buffer
+ _M_len
);
141 // Disable copy constructor and assignment operator.
142 _Temporary_buffer(const _Temporary_buffer
&) {}
143 void operator=(const _Temporary_buffer
&) {}
148 #endif /* _TEMPBUF_H */