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Diffstat (limited to 'contrib/libstdc++/include/std/std_memory.h')
| -rw-r--r-- | contrib/libstdc++/include/std/std_memory.h | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/contrib/libstdc++/include/std/std_memory.h b/contrib/libstdc++/include/std/std_memory.h new file mode 100644 index 0000000..b7feb37 --- /dev/null +++ b/contrib/libstdc++/include/std/std_memory.h @@ -0,0 +1,204 @@ +// <memory> -*- C++ -*- + +// Copyright (C) 2001, 2002 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) 1997-1999 + * 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 memory + * This is a Standard C++ Library header. You should @c #include this header + * in your programs, rather than any of the "st[dl]_*.h" implementation files. + */ + +#ifndef _CPP_MEMORY +#define _CPP_MEMORY 1 + +#pragma GCC system_header + +#include <bits/stl_algobase.h> +#include <bits/stl_alloc.h> +#include <bits/stl_construct.h> +#include <bits/stl_iterator_base_types.h> //for iterator_traits +#include <bits/stl_uninitialized.h> +#include <bits/stl_raw_storage_iter.h> + +namespace std +{ + + /** + * @if maint + * This is a helper function. The unused second parameter exists to + * permit the real get_temporary_buffer to use template parameter deduction. + * @endif + */ + 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*) std::malloc((std::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); + } + + /** + * @brief This is a mostly-useless wrapper around malloc(). + * @param len The number of objects of type Tp. + * @return See full description. + * + * Reinventing the wheel, but this time with prettier spokes! + * + * This function tries to obtain storage for @c len adjacent Tp objects. + * The objects themselves are not constructed, of course. A pair<> is + * returned containing "the buffer s address and capacity (in the units of + * sizeof(Tp)), or a pair of 0 values if no storage can be obtained." + * Note that the capacity obtained may be less than that requested if the + * memory is unavailable; you should compare len with the .second return + * value. + */ + template <class _Tp> + inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len) { + return __get_temporary_buffer(__len, (_Tp*) 0); + } + + /** + * @brief The companion to get_temporary_buffer(). + * @param p A buffer previously allocated by get_temporary_buffer. + * @return None. + * + * Frees the memory pointed to by p. + */ + template <class _Tp> + void return_temporary_buffer(_Tp* __p) { + std::free(__p); + } + + +template <class _Tp1> + struct auto_ptr_ref +{ + _Tp1* _M_ptr; + auto_ptr_ref(_Tp1* __p) : _M_ptr(__p) {} +}; + +/** + * A simple smart pointer providing strict ownership semantics. (More later.) +*/ +template <class _Tp> + class auto_ptr +{ +private: + _Tp* _M_ptr; + +public: + typedef _Tp element_type; + + explicit auto_ptr(_Tp* __p = 0) throw() : _M_ptr(__p) {} + auto_ptr(auto_ptr& __a) throw() : _M_ptr(__a.release()) {} + + template <class _Tp1> auto_ptr(auto_ptr<_Tp1>& __a) throw() + : _M_ptr(__a.release()) {} + + auto_ptr& operator=(auto_ptr& __a) throw() { + reset(__a.release()); + return *this; + } + + template <class _Tp1> + auto_ptr& operator=(auto_ptr<_Tp1>& __a) throw() { + reset(__a.release()); + return *this; + } + + // Note: The C++ standard says there is supposed to be an empty throw + // specification here, but omitting it is standard conforming. Its + // presence can be detected only if _Tp::~_Tp() throws, but (17.4.3.6/2) + // this is prohibited. + ~auto_ptr() { delete _M_ptr; } + + _Tp& operator*() const throw() { + return *_M_ptr; + } + _Tp* operator->() const throw() { + return _M_ptr; + } + _Tp* get() const throw() { + return _M_ptr; + } + _Tp* release() throw() { + _Tp* __tmp = _M_ptr; + _M_ptr = 0; + return __tmp; + } + void reset(_Tp* __p = 0) throw() { + if (__p != _M_ptr) { + delete _M_ptr; + _M_ptr = __p; + } + } + +public: + auto_ptr(auto_ptr_ref<_Tp> __ref) throw() + : _M_ptr(__ref._M_ptr) {} + + auto_ptr& operator=(auto_ptr_ref<_Tp> __ref) throw() { + if (__ref._M_ptr != this->get()) { + delete _M_ptr; + _M_ptr = __ref._M_ptr; + } + return *this; + } + + template <class _Tp1> operator auto_ptr_ref<_Tp1>() throw() + { return auto_ptr_ref<_Tp>(this->release()); } + template <class _Tp1> operator auto_ptr<_Tp1>() throw() + { return auto_ptr<_Tp1>(this->release()); } +}; + +} // namespace std + +#endif /* _CPP_MEMORY */ + |
