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Diffstat (limited to 'libstdc++-v3/bits/stl_tempbuf.h')
| -rw-r--r-- | libstdc++-v3/bits/stl_tempbuf.h | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/libstdc++-v3/bits/stl_tempbuf.h b/libstdc++-v3/bits/stl_tempbuf.h new file mode 100644 index 00000000000..cdc0dd27df0 --- /dev/null +++ b/libstdc++-v3/bits/stl_tempbuf.h @@ -0,0 +1,161 @@ +/* + * + * 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: |
