stl_temp.h
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上传日期:2022-05-14
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文件大小:5k
源码类别:
STL
开发平台:
Visual C++
- /*
- *
- * Copyright (c) 1994
- * Hewlett-Packard Company
- *
- * Permission to use, copy, modify, distribute and sell this software
- * and its documentation for any purpose is hereby granted without fee,
- * provided that the above copyright notice appear in all copies and
- * that both that copyright notice and this permission notice appear
- * in supporting documentation. Hewlett-Packard Company makes no
- * representations about the suitability of this software for any
- * purpose. It is provided "as is" without express or implied warranty.
- *
- *
- * Copyright (c) 1996,1997
- * Silicon Graphics Computer Systems, Inc.
- *
- * Permission to use, copy, modify, distribute and sell this software
- * and its documentation for any purpose is hereby granted without fee,
- * provided that the above copyright notice appear in all copies and
- * that both that copyright notice and this permission notice appear
- * in supporting documentation. Silicon Graphics makes no
- * representations about the suitability of this software for any
- * purpose. It is provided "as is" without express or implied warranty.
- */
- /* NOTE: This is an internal header file, included by other STL headers.
- * You should not attempt to use it directly.
- */
- #ifndef __SGI_STL_INTERNAL_TEMPBUF_H
- #define __SGI_STL_INTERNAL_TEMPBUF_H
- __STL_BEGIN_NAMESPACE
- template <class _Tp>
- pair<_Tp*, ptrdiff_t>
- __get_temporary_buffer(ptrdiff_t __len, _Tp*)
- {
- if (__len > ptrdiff_t(INT_MAX / sizeof(_Tp)))
- __len = INT_MAX / sizeof(_Tp);
- while (__len > 0) {
- _Tp* __tmp = (_Tp*) malloc((size_t)__len * sizeof(_Tp));
- if (__tmp != 0)
- return pair<_Tp*, ptrdiff_t>(__tmp, __len);
- __len /= 2;
- }
- return pair<_Tp*, ptrdiff_t>((_Tp*)0, 0);
- }
- #ifdef __STL_EXPLICIT_FUNCTION_TMPL_ARGS
- template <class _Tp>
- inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len) {
- return __get_temporary_buffer(__len, (_Tp*) 0);
- }
- #endif /* __STL_EXPLICIT_FUNCTION_TMPL_ARGS */
- // This overload is not required by the standard; it is an extension.
- // It is supported for backward compatibility with the HP STL, and
- // because not all compilers support the language feature (explicit
- // function template arguments) that is required for the standard
- // version of get_temporary_buffer.
- template <class _Tp>
- inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len, _Tp*) {
- return __get_temporary_buffer(__len, (_Tp*) 0);
- }
- template <class _Tp>
- void return_temporary_buffer(_Tp* __p) {
- free(__p);
- }
- template <class _ForwardIterator, class _Tp>
- class _Temporary_buffer {
- private:
- ptrdiff_t _M_original_len;
- ptrdiff_t _M_len;
- _Tp* _M_buffer;
- void _M_allocate_buffer() {
- _M_original_len = _M_len;
- _M_buffer = 0;
- if (_M_len > (ptrdiff_t)(INT_MAX / sizeof(_Tp)))
- _M_len = INT_MAX / sizeof(_Tp);
- while (_M_len > 0) {
- _M_buffer = (_Tp*) malloc(_M_len * sizeof(_Tp));
- if (_M_buffer)
- break;
- _M_len /= 2;
- }
- }
- void _M_initialize_buffer(const _Tp&, __true_type) {}
- void _M_initialize_buffer(const _Tp& val, __false_type) {
- uninitialized_fill_n(_M_buffer, _M_len, val);
- }
- public:
- ptrdiff_t size() const { return _M_len; }
- ptrdiff_t requested_size() const { return _M_original_len; }
- _Tp* begin() { return _M_buffer; }
- _Tp* end() { return _M_buffer + _M_len; }
- _Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) {
- // Workaround for a __type_traits bug in the pre-7.3 compiler.
- # if defined(__sgi) && !defined(__GNUC__) && _COMPILER_VERSION < 730
- typedef typename __type_traits<_Tp>::is_POD_type _Trivial;
- # else
- typedef typename __type_traits<_Tp>::has_trivial_default_constructor
- _Trivial;
- # endif
- __STL_TRY {
- _M_len = 0;
- distance(__first, __last, _M_len);
- _M_allocate_buffer();
- if (_M_len > 0)
- _M_initialize_buffer(*__first, _Trivial());
- }
- __STL_UNWIND(free(_M_buffer); _M_buffer = 0; _M_len = 0);
- }
- ~_Temporary_buffer() {
- destroy(_M_buffer, _M_buffer + _M_len);
- free(_M_buffer);
- }
- private:
- // Disable copy constructor and assignment operator.
- _Temporary_buffer(const _Temporary_buffer&) {}
- void operator=(const _Temporary_buffer&) {}
- };
- // Class temporary_buffer is not part of the standard. It is an extension.
- template <class _ForwardIterator,
- class _Tp
- #ifdef __STL_CLASS_PARTIAL_SPECIALIZATION
- = typename iterator_traits<_ForwardIterator>::value_type
- #endif /* __STL_CLASS_PARTIAL_SPECIALIZATION */
- >
- struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp>
- {
- temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
- : _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) {}
- ~temporary_buffer() {}
- };
- __STL_END_NAMESPACE
- #endif /* __SGI_STL_INTERNAL_TEMPBUF_H */
- // Local Variables:
- // mode:C++
- // End: