1 /*
2 *
3 * Copyright (c) 1994
4 * Hewlett-Packard Company
5 *
6 * Copyright (c) 1996,1997
7 * Silicon Graphics Computer Systems, Inc.
8 *
9 * Copyright (c) 1997
10 * Moscow Center for SPARC Technology
11 *
12 * Copyright (c) 1999
13 * Boris Fomitchev
14 *
15 * This material is provided "as is", with absolutely no warranty expressed
16 * or implied. Any use is at your own risk.
17 *
18 * Permission to use or copy this software for any purpose is hereby granted
19 * without fee, provided the above notices are retained on all copies.
20 * Permission to modify the code and to distribute modified code is granted,
21 * provided the above notices are retained, and a notice that the code was
22 * modified is included with the above copyright notice.
23 *
24 */
25
26 /* NOTE: This is an internal header file, included by other STL headers.
27 * You should not attempt to use it directly.
28 */
29
30 #ifndef _STLP_INTERNAL_TEMPBUF_H
31 #define _STLP_INTERNAL_TEMPBUF_H
32
33 #ifndef _STLP_CLIMITS
34 # include <climits>
35 #endif
36
37 #ifndef _STLP_INTERNAL_CSTDLIB
38 # include <stl/_cstdlib.h>
39 #endif
40
41 #ifndef _STLP_INTERNAL_UNINITIALIZED_H
42 # include <stl/_uninitialized.h>
43 #endif
44
45 _STLP_BEGIN_NAMESPACE
46
47 template <class _Tp>
48 pair<_Tp*, ptrdiff_t> _STLP_CALL
49 __get_temporary_buffer(ptrdiff_t __len, _Tp*);
50
51 #ifndef _STLP_NO_EXPLICIT_FUNCTION_TMPL_ARGS
52
53 template <class _Tp>
get_temporary_buffer(ptrdiff_t __len)54 inline pair<_Tp*, ptrdiff_t> _STLP_CALL get_temporary_buffer(ptrdiff_t __len) {
55 return __get_temporary_buffer(__len, (_Tp*) 0);
56 }
57
58 # if ! defined(_STLP_NO_EXTENSIONS)
59 // This overload is not required by the standard; it is an extension.
60 // It is supported for backward compatibility with the HP STL, and
61 // because not all compilers support the language feature (explicit
62 // function template arguments) that is required for the standard
63 // version of get_temporary_buffer.
64 template <class _Tp>
65 inline pair<_Tp*, ptrdiff_t> _STLP_CALL
get_temporary_buffer(ptrdiff_t __len,_Tp *)66 get_temporary_buffer(ptrdiff_t __len, _Tp*) {
67 return __get_temporary_buffer(__len, (_Tp*) 0);
68 }
69 # endif
70 #endif
71
72 template <class _Tp>
return_temporary_buffer(_Tp * __p)73 inline void _STLP_CALL return_temporary_buffer(_Tp* __p) {
74 // SunPro brain damage
75 free((char*)__p);
76 }
77
78 template <class _ForwardIterator, class _Tp>
79 class _Temporary_buffer {
80 private:
81 ptrdiff_t _M_original_len;
82 ptrdiff_t _M_len;
83 _Tp* _M_buffer;
84
_M_allocate_buffer()85 void _M_allocate_buffer() {
86 _M_original_len = _M_len;
87 _M_buffer = 0;
88
89 if (_M_len > (ptrdiff_t)(INT_MAX / sizeof(_Tp)))
90 _M_len = INT_MAX / sizeof(_Tp);
91
92 while (_M_len > 0) {
93 _M_buffer = (_Tp*) malloc(_M_len * sizeof(_Tp));
94 if (_M_buffer)
95 break;
96 _M_len /= 2;
97 }
98 }
99
_M_initialize_buffer(const _Tp &,const __true_type &)100 void _M_initialize_buffer(const _Tp&, const __true_type&) {}
_M_initialize_buffer(const _Tp & val,const __false_type &)101 void _M_initialize_buffer(const _Tp& val, const __false_type&) {
102 uninitialized_fill_n(_M_buffer, _M_len, val);
103 }
104
105 public:
size()106 ptrdiff_t size() const { return _M_len; }
requested_size()107 ptrdiff_t requested_size() const { return _M_original_len; }
begin()108 _Tp* begin() { return _M_buffer; }
end()109 _Tp* end() { return _M_buffer + _M_len; }
110
_Temporary_buffer(_ForwardIterator __first,_ForwardIterator __last)111 _Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) {
112 // Workaround for a __type_traits bug in the pre-7.3 compiler.
113 # if defined(__sgi) && !defined(__GNUC__) && _COMPILER_VERSION < 730
114 typedef typename __type_traits<_Tp>::is_POD_type _Trivial;
115 # else
116 typedef typename __type_traits<_Tp>::has_trivial_default_constructor _Trivial;
117 # endif
118 _STLP_TRY {
119 _M_len = _STLP_STD::distance(__first, __last);
120 _M_allocate_buffer();
121 if (_M_len > 0)
122 _M_initialize_buffer(*__first, _Trivial());
123 }
124 _STLP_UNWIND(free(_M_buffer); _M_buffer = 0; _M_len = 0)
125 }
126
~_Temporary_buffer()127 ~_Temporary_buffer() {
128 _STLP_STD::_Destroy_Range(_M_buffer, _M_buffer + _M_len);
129 free(_M_buffer);
130 }
131
132 private:
133 // Disable copy constructor and assignment operator.
_Temporary_buffer(const _Temporary_buffer<_ForwardIterator,_Tp> &)134 _Temporary_buffer(const _Temporary_buffer<_ForwardIterator, _Tp>&) {}
135 void operator=(const _Temporary_buffer<_ForwardIterator, _Tp>&) {}
136 };
137
138 # ifndef _STLP_NO_EXTENSIONS
139
140 // Class temporary_buffer is not part of the standard. It is an extension.
141
142 template <class _ForwardIterator,
143 class _Tp
144 #ifdef _STLP_CLASS_PARTIAL_SPECIALIZATION
145 = typename iterator_traits<_ForwardIterator>::value_type
146 #endif /* _STLP_CLASS_PARTIAL_SPECIALIZATION */
147 >
148 struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp>
149 {
temporary_buffertemporary_buffer150 temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
151 : _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) {}
~temporary_buffertemporary_buffer152 ~temporary_buffer() {}
153 };
154
155 # endif /* _STLP_NO_EXTENSIONS */
156
157 _STLP_END_NAMESPACE
158
159 # ifndef _STLP_LINK_TIME_INSTANTIATION
160 # include <stl/_tempbuf.c>
161 # endif
162
163 #endif /* _STLP_INTERNAL_TEMPBUF_H */
164
165 // Local Variables:
166 // mode:C++
167 // End:
168