stl_tempbuf.h
资源名称:Vc_STL.rar [点击查看]
上传用户:sichengcw
上传日期:2009-02-17
资源大小:202k
文件大小:3k
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 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: