124 lines
3.3 KiB
C++
124 lines
3.3 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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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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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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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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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 __SGI_STL_INTERNAL_TEMPBUF_H
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#define __SGI_STL_INTERNAL_TEMPBUF_H
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__STL_BEGIN_NAMESPACE
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template <class T>
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pair<T*, ptrdiff_t> get_temporary_buffer(ptrdiff_t len, T*) {
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if (len > ptrdiff_t(INT_MAX / sizeof(T)))
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len = INT_MAX / sizeof(T);
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while (len > 0) {
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T* tmp = (T*) malloc((size_t)len * sizeof(T));
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if (tmp != 0)
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return pair<T*, ptrdiff_t>(tmp, len);
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len /= 2;
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}
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return pair<T*, ptrdiff_t>((T*)0, 0);
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}
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template <class T>
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void return_temporary_buffer(T* p) {
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free(p);
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}
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template <class ForwardIterator,
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class T
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#ifdef __STL_CLASS_PARTIAL_SPECIALIZATION
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= iterator_traits<ForwardIterator>::value_type
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#endif /* __STL_CLASS_PARTIAL_SPECIALIZATION */
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>
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class temporary_buffer {
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private:
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ptrdiff_t original_len;
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ptrdiff_t len;
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T* buffer;
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void allocate_buffer() {
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original_len = len;
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buffer = 0;
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if (len > (ptrdiff_t)(INT_MAX / sizeof(T)))
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len = INT_MAX / sizeof(T);
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while (len > 0) {
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buffer = (T*) malloc(len * sizeof(T));
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if (buffer)
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break;
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len /= 2;
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}
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}
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void initialize_buffer(const T&, __true_type) {}
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void initialize_buffer(const T& val, __false_type) {
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uninitialized_fill_n(buffer, len, val);
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}
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public:
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ptrdiff_t size() const { return len; }
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ptrdiff_t requested_size() const { return original_len; }
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T* begin() { return buffer; }
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T* end() { return buffer + len; }
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temporary_buffer(ForwardIterator first, ForwardIterator last) {
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__STL_TRY {
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len = 0;
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distance(first, last, len);
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allocate_buffer();
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if (len > 0)
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initialize_buffer(*first,
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typename __type_traits<T>::has_trivial_default_constructor());
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}
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__STL_UNWIND(free(buffer); buffer = 0; len = 0);
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}
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~temporary_buffer() {
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destroy(buffer, buffer + len);
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free(buffer);
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}
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private:
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temporary_buffer(const temporary_buffer&) {}
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void operator=(const temporary_buffer&) {}
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};
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__STL_END_NAMESPACE
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#endif /* __SGI_STL_INTERNAL_TEMPBUF_H */
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// Local Variables:
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// mode:C++
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// End:
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