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Whole document tree                   stl_tempbuf.h Go to the documentation of this file. // Temporary buffer implementation -*- C++ -*- // Copyright (C) 2001 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 2, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License along // with this library; see the file COPYING. If not, write to the Free // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, // USA. // As a special exception, you may use this file as part of a free software // library without restriction. Specifically, if other files instantiate // templates or use macros or inline functions from this file, or you compile // this file and link it with other files to produce an executable, this // file does not by itself cause the resulting executable to be covered by // the GNU General Public License. This exception does not however // invalidate any other reasons why the executable file might be covered by // the GNU General Public License. /* * * 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 namespace std { 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); } template <class _Tp> inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len) { return __get_temporary_buffer(__len, (_Tp*) 0); } // 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. typedef typename __type_traits<_Tp>::has_trivial_default_constructor _Trivial; __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 = typename iterator_traits<_ForwardIterator>::value_type > struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp> { temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) : _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) {} ~temporary_buffer() {} }; } // namespace std #endif /* __SGI_STL_INTERNAL_TEMPBUF_H */ // Local Variables: // mode:C++ // End: