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| 4680 | right-hear | 1 | /* |
| 2 | * |
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| 3 | * Copyright (c) 1994 |
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| 4 | * Hewlett-Packard Company |
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| 5 | * |
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| 6 | * Permission to use, copy, modify, distribute and sell this software |
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| 7 | * and its documentation for any purpose is hereby granted without fee, |
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| 8 | * provided that the above copyright notice appear in all copies and |
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| 9 | * that both that copyright notice and this permission notice appear |
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| 10 | * in supporting documentation. Hewlett-Packard Company makes no |
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| 11 | * representations about the suitability of this software for any |
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| 12 | * purpose. It is provided "as is" without express or implied warranty. |
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| 13 | * |
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| 14 | * |
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| 15 | * Copyright (c) 1996,1997 |
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| 16 | * Silicon Graphics Computer Systems, Inc. |
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| 17 | * |
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| 18 | * Permission to use, copy, modify, distribute and sell this software |
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| 19 | * and its documentation for any purpose is hereby granted without fee, |
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| 20 | * provided that the above copyright notice appear in all copies and |
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| 21 | * that both that copyright notice and this permission notice appear |
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| 22 | * in supporting documentation. Silicon Graphics makes no |
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| 23 | * representations about the suitability of this software for any |
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| 24 | * purpose. It is provided "as is" without express or implied warranty. |
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| 25 | */ |
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| 26 | |||
| 27 | /* NOTE: This is an internal header file, included by other STL headers. |
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| 28 | * You should not attempt to use it directly. |
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| 29 | */ |
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| 30 | |||
| 31 | #ifndef __SGI_STL_INTERNAL_TEMPBUF_H |
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| 32 | #define __SGI_STL_INTERNAL_TEMPBUF_H |
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| 33 | |||
| 34 | namespace std |
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| 35 | { |
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| 36 | |||
| 37 | template |
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| 38 | pair<_Tp*, ptrdiff_t> |
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| 39 | __get_temporary_buffer(ptrdiff_t __len, _Tp*) |
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| 40 | { |
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| 41 | if (__len > ptrdiff_t(INT_MAX / sizeof(_Tp))) |
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| 42 | __len = INT_MAX / sizeof(_Tp); |
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| 43 | |||
| 44 | while (__len > 0) { |
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| 45 | _Tp* __tmp = (_Tp*) malloc((size_t)__len * sizeof(_Tp)); |
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| 46 | if (__tmp != 0) |
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| 47 | return pair<_Tp*, ptrdiff_t>(__tmp, __len); |
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| 48 | __len /= 2; |
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| 49 | } |
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| 50 | |||
| 51 | return pair<_Tp*, ptrdiff_t>((_Tp*)0, 0); |
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| 52 | } |
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| 53 | |||
| 54 | template |
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| 55 | inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len) { |
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| 56 | return __get_temporary_buffer(__len, (_Tp*) 0); |
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| 57 | } |
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| 58 | |||
| 59 | // This overload is not required by the standard; it is an extension. |
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| 60 | // It is supported for backward compatibility with the HP STL, and |
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| 61 | // because not all compilers support the language feature (explicit |
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| 62 | // function template arguments) that is required for the standard |
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| 63 | // version of get_temporary_buffer. |
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| 64 | template |
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| 65 | inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len, _Tp*) { |
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| 66 | return __get_temporary_buffer(__len, (_Tp*) 0); |
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| 67 | } |
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| 68 | |||
| 69 | template |
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| 70 | void return_temporary_buffer(_Tp* __p) { |
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| 71 | free(__p); |
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| 72 | } |
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| 73 | |||
| 74 | template |
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| 75 | class _Temporary_buffer { |
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| 76 | private: |
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| 77 | ptrdiff_t _M_original_len; |
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| 78 | ptrdiff_t _M_len; |
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| 79 | _Tp* _M_buffer; |
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| 80 | |||
| 81 | void _M_allocate_buffer() { |
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| 82 | _M_original_len = _M_len; |
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| 83 | _M_buffer = 0; |
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| 84 | |||
| 85 | if (_M_len > (ptrdiff_t)(INT_MAX / sizeof(_Tp))) |
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| 86 | _M_len = INT_MAX / sizeof(_Tp); |
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| 87 | |||
| 88 | while (_M_len > 0) { |
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| 89 | _M_buffer = (_Tp*) malloc(_M_len * sizeof(_Tp)); |
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| 90 | if (_M_buffer) |
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| 91 | break; |
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| 92 | _M_len /= 2; |
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| 93 | } |
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| 94 | } |
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| 95 | |||
| 96 | void _M_initialize_buffer(const _Tp&, __true_type) {} |
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| 97 | void _M_initialize_buffer(const _Tp& val, __false_type) { |
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| 98 | uninitialized_fill_n(_M_buffer, _M_len, val); |
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| 99 | } |
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| 100 | |||
| 101 | public: |
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| 102 | ptrdiff_t size() const { return _M_len; } |
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| 103 | ptrdiff_t requested_size() const { return _M_original_len; } |
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| 104 | _Tp* begin() { return _M_buffer; } |
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| 105 | _Tp* end() { return _M_buffer + _M_len; } |
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| 106 | |||
| 107 | _Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) { |
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| 108 | // Workaround for a __type_traits bug in the pre-7.3 compiler. |
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| 109 | typedef typename __type_traits<_Tp>::has_trivial_default_constructor |
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| 110 | _Trivial; |
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| 111 | |||
| 112 | __STL_TRY { |
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| 113 | _M_len = 0; |
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| 114 | distance(__first, __last, _M_len); |
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| 115 | _M_allocate_buffer(); |
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| 116 | if (_M_len > 0) |
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| 117 | _M_initialize_buffer(*__first, _Trivial()); |
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| 118 | } |
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| 119 | __STL_UNWIND(free(_M_buffer); _M_buffer = 0; _M_len = 0); |
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| 120 | } |
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| 121 | |||
| 122 | ~_Temporary_buffer() { |
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| 123 | destroy(_M_buffer, _M_buffer + _M_len); |
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| 124 | free(_M_buffer); |
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| 125 | } |
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| 126 | |||
| 127 | private: |
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| 128 | // Disable copy constructor and assignment operator. |
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| 129 | _Temporary_buffer(const _Temporary_buffer&) {} |
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| 130 | void operator=(const _Temporary_buffer&) {} |
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| 131 | }; |
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| 132 | |||
| 133 | // Class temporary_buffer is not part of the standard. It is an extension. |
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| 134 | |||
| 135 | template |
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| 136 | class _Tp |
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| 137 | = typename iterator_traits<_ForwardIterator>::value_type |
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| 138 | > |
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| 139 | struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp> |
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| 140 | { |
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| 141 | temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) |
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| 142 | : _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) {} |
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| 143 | ~temporary_buffer() {} |
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| 144 | }; |
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| 145 | |||
| 146 | } // namespace std |
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| 147 | |||
| 148 | #endif /* __SGI_STL_INTERNAL_TEMPBUF_H */ |
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| 149 | |||
| 150 | // Local Variables: |
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| 151 | // mode:C++ |
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| 152 | // End: |