| // 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. |
| */ |
| |
| /** @file stl_tempbuf.h |
| * This is an internal header file, included by other library headers. |
| * You should not attempt to use it directly. |
| */ |
| |
| #ifndef __GLIBCPP_INTERNAL_TEMPBUF_H |
| #define __GLIBCPP_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); |
| } |
| |
| /** |
| * This is a mostly-useless wrapper around malloc(). |
| */ |
| template <class _Tp> |
| inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len) { |
| return __get_temporary_buffer(__len, (_Tp*) 0); |
| } |
| |
| /** |
| * The companion to get_temporary_buffer(). |
| */ |
| 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; |
| |
| try { |
| _M_len = 0; |
| distance(__first, __last, _M_len); |
| _M_allocate_buffer(); |
| if (_M_len > 0) |
| _M_initialize_buffer(*__first, _Trivial()); |
| } |
| catch(...) |
| { |
| free(_M_buffer); |
| _M_buffer = 0; |
| _M_len = 0; |
| __throw_exception_again; |
| } |
| } |
| |
| ~_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 /* __GLIBCPP_INTERNAL_TEMPBUF_H */ |
| |
| // Local Variables: |
| // mode:C++ |
| // End: |