diff options
Diffstat (limited to 'contrib/libstdc++/stl/stl_tempbuf.h')
-rw-r--r-- | contrib/libstdc++/stl/stl_tempbuf.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/contrib/libstdc++/stl/stl_tempbuf.h b/contrib/libstdc++/stl/stl_tempbuf.h new file mode 100644 index 0000000..9dbc238 --- /dev/null +++ b/contrib/libstdc++/stl/stl_tempbuf.h @@ -0,0 +1,123 @@ +/* + * + * 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 T> +pair<T*, ptrdiff_t> get_temporary_buffer(ptrdiff_t len, T*) { + if (len > ptrdiff_t(INT_MAX / sizeof(T))) + len = INT_MAX / sizeof(T); + + while (len > 0) { + T* tmp = (T*) malloc((size_t)len * sizeof(T)); + if (tmp != 0) + return pair<T*, ptrdiff_t>(tmp, len); + len /= 2; + } + + return pair<T*, ptrdiff_t>((T*)0, 0); +} + +template <class T> +void return_temporary_buffer(T* p) { + free(p); +} + +template <class ForwardIterator, + class T +#ifdef __STL_CLASS_PARTIAL_SPECIALIZATION + = iterator_traits<ForwardIterator>::value_type +#endif /* __STL_CLASS_PARTIAL_SPECIALIZATION */ + > +class temporary_buffer { +private: + ptrdiff_t original_len; + ptrdiff_t len; + T* buffer; + + void allocate_buffer() { + original_len = len; + buffer = 0; + + if (len > (ptrdiff_t)(INT_MAX / sizeof(T))) + len = INT_MAX / sizeof(T); + + while (len > 0) { + buffer = (T*) malloc(len * sizeof(T)); + if (buffer) + break; + len /= 2; + } + } + + void initialize_buffer(const T&, __true_type) {} + void initialize_buffer(const T& val, __false_type) { + uninitialized_fill_n(buffer, len, val); + } + +public: + ptrdiff_t size() const { return len; } + ptrdiff_t requested_size() const { return original_len; } + T* begin() { return buffer; } + T* end() { return buffer + len; } + + temporary_buffer(ForwardIterator first, ForwardIterator last) { + __STL_TRY { + len = 0; + distance(first, last, len); + allocate_buffer(); + if (len > 0) + initialize_buffer(*first, + typename __type_traits<T>::has_trivial_default_constructor()); + } + __STL_UNWIND(free(buffer); buffer = 0; len = 0); + } + + ~temporary_buffer() { + destroy(buffer, buffer + len); + free(buffer); + } + +private: + temporary_buffer(const temporary_buffer&) {} + void operator=(const temporary_buffer&) {} +}; + +__STL_END_NAMESPACE + +#endif /* __SGI_STL_INTERNAL_TEMPBUF_H */ + +// Local Variables: +// mode:C++ +// End: |