mirror of
https://github.com/reactos/reactos.git
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168 lines
4.6 KiB
C++
168 lines
4.6 KiB
C++
/*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Copyright (c) 1996,1997
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* Silicon Graphics Computer Systems, Inc.
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*
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* Copyright (c) 1997
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* Moscow Center for SPARC Technology
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*
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* Copyright (c) 1999
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* Boris Fomitchev
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*
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* This material is provided "as is", with absolutely no warranty expressed
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* or implied. Any use is at your own risk.
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*
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* Permission to use or copy this software for any purpose is hereby granted
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* without fee, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*
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*/
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/* NOTE: This is an internal header file, included by other STL headers.
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* You should not attempt to use it directly.
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*/
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#ifndef _STLP_INTERNAL_TEMPBUF_H
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#define _STLP_INTERNAL_TEMPBUF_H
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#ifndef _STLP_CLIMITS
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# include <climits>
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#endif
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#ifndef _STLP_INTERNAL_CSTDLIB
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# include <stl/_cstdlib.h>
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#endif
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#ifndef _STLP_INTERNAL_UNINITIALIZED_H
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# include <stl/_uninitialized.h>
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#endif
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_STLP_BEGIN_NAMESPACE
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template <class _Tp>
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pair<_Tp*, ptrdiff_t> _STLP_CALL
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__get_temporary_buffer(ptrdiff_t __len, _Tp*);
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#ifndef _STLP_NO_EXPLICIT_FUNCTION_TMPL_ARGS
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template <class _Tp>
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inline pair<_Tp*, ptrdiff_t> _STLP_CALL get_temporary_buffer(ptrdiff_t __len) {
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return __get_temporary_buffer(__len, (_Tp*) 0);
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}
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# if ! defined(_STLP_NO_EXTENSIONS)
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// This overload is not required by the standard; it is an extension.
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// It is supported for backward compatibility with the HP STL, and
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// because not all compilers support the language feature (explicit
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// function template arguments) that is required for the standard
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// version of get_temporary_buffer.
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template <class _Tp>
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inline pair<_Tp*, ptrdiff_t> _STLP_CALL
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get_temporary_buffer(ptrdiff_t __len, _Tp*) {
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return __get_temporary_buffer(__len, (_Tp*) 0);
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}
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# endif
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#endif
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template <class _Tp>
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inline void _STLP_CALL return_temporary_buffer(_Tp* __p) {
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// SunPro brain damage
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free((char*)__p);
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}
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template <class _ForwardIterator, class _Tp>
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class _Temporary_buffer {
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private:
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ptrdiff_t _M_original_len;
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ptrdiff_t _M_len;
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_Tp* _M_buffer;
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void _M_allocate_buffer() {
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_M_original_len = _M_len;
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_M_buffer = 0;
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if (_M_len > (ptrdiff_t)(INT_MAX / sizeof(_Tp)))
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_M_len = INT_MAX / sizeof(_Tp);
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while (_M_len > 0) {
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_M_buffer = (_Tp*) malloc(_M_len * sizeof(_Tp));
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if (_M_buffer)
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break;
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_M_len /= 2;
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}
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}
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void _M_initialize_buffer(const _Tp&, const __true_type&) {}
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void _M_initialize_buffer(const _Tp& val, const __false_type&) {
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uninitialized_fill_n(_M_buffer, _M_len, val);
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}
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public:
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ptrdiff_t size() const { return _M_len; }
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ptrdiff_t requested_size() const { return _M_original_len; }
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_Tp* begin() { return _M_buffer; }
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_Tp* end() { return _M_buffer + _M_len; }
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_Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) {
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// Workaround for a __type_traits bug in the pre-7.3 compiler.
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# if defined(__sgi) && !defined(__GNUC__) && _COMPILER_VERSION < 730
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typedef typename __type_traits<_Tp>::is_POD_type _Trivial;
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# else
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typedef typename __type_traits<_Tp>::has_trivial_default_constructor _Trivial;
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# endif
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_STLP_TRY {
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_M_len = _STLP_STD::distance(__first, __last);
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_M_allocate_buffer();
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if (_M_len > 0)
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_M_initialize_buffer(*__first, _Trivial());
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}
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_STLP_UNWIND(free(_M_buffer); _M_buffer = 0; _M_len = 0)
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}
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~_Temporary_buffer() {
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_STLP_STD::_Destroy_Range(_M_buffer, _M_buffer + _M_len);
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free(_M_buffer);
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}
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private:
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// Disable copy constructor and assignment operator.
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_Temporary_buffer(const _Temporary_buffer<_ForwardIterator, _Tp>&) {}
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void operator=(const _Temporary_buffer<_ForwardIterator, _Tp>&) {}
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};
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# ifndef _STLP_NO_EXTENSIONS
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// Class temporary_buffer is not part of the standard. It is an extension.
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template <class _ForwardIterator,
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class _Tp
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#ifdef _STLP_CLASS_PARTIAL_SPECIALIZATION
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= typename iterator_traits<_ForwardIterator>::value_type
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#endif /* _STLP_CLASS_PARTIAL_SPECIALIZATION */
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>
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struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp>
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{
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temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
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: _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) {}
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~temporary_buffer() {}
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};
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# endif /* _STLP_NO_EXTENSIONS */
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_STLP_END_NAMESPACE
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# ifndef _STLP_LINK_TIME_INSTANTIATION
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# include <stl/_tempbuf.c>
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# endif
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#endif /* _STLP_INTERNAL_TEMPBUF_H */
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// Local Variables:
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// mode:C++
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// End:
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