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> 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 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> 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 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 } 99 100 void _M_initialize_buffer(const _Tp&, const __true_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: 106 ptrdiff_t size() const { return _M_len; } 107 ptrdiff_t requested_size() const { return _M_original_len; } 108 _Tp* begin() { return _M_buffer; } 109 _Tp* end() { return _M_buffer + _M_len; } 110 111 _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 } 126 127 ~_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. 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 { 150 temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) 151 : _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) {} 152 ~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
