209 lines
6.0 KiB
C++
209 lines
6.0 KiB
C++
// <memory> -*- C++ -*-
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// Copyright (C) 2001, 2002 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/*
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* Copyright (c) 1997-1999
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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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*/
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/** @file std_memory.h
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* This is an internal header file, included by other library headers.
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* You should not attempt to use it directly.
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*/
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#ifndef _CPP_MEMORY
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#define _CPP_MEMORY 1
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#pragma GCC system_header
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#include <bits/stl_algobase.h>
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#include <bits/stl_alloc.h>
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#include <bits/stl_construct.h>
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#include <bits/stl_iterator_base_types.h> //for iterator_traits
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#include <bits/stl_uninitialized.h>
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#include <bits/stl_raw_storage_iter.h>
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namespace std
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{
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/**
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* @maint
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* This is a helper function. The unused second parameter exists to
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* permit the real get_temporary_buffer to use template parameter deduction.
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* @endmaint
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*/
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template <class _Tp>
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pair<_Tp*, ptrdiff_t>
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__get_temporary_buffer(ptrdiff_t __len, _Tp*)
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{
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if (__len > ptrdiff_t(INT_MAX / sizeof(_Tp)))
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__len = INT_MAX / sizeof(_Tp);
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while (__len > 0) {
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_Tp* __tmp = (_Tp*) std::malloc((std::size_t)__len * sizeof(_Tp));
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if (__tmp != 0)
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return pair<_Tp*, ptrdiff_t>(__tmp, __len);
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__len /= 2;
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}
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return pair<_Tp*, ptrdiff_t>((_Tp*)0, 0);
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}
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/**
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* @brief This is a mostly-useless wrapper around malloc().
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* @param len The number of objects of type Tp.
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* @return See full description.
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*
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* Reinventing the wheel, but this time with prettier spokes!
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*
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* This function tries to obtain storage for @c len adjacent Tp objects.
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* The objects themselves are not constructed, of course. A pair<> is
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* returned containing "the buffer s address and capacity (in the units of
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* sizeof(Tp)), or a pair of 0 values if no storage can be obtained."
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* Note that the capacity obtained may be less than that requested if the
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* memory is unavailable; you should compare len with the .second return
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* value.
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*/
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template <class _Tp>
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inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len) {
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return __get_temporary_buffer(__len, (_Tp*) 0);
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}
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/**
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* @brief The companion to get_temporary_buffer().
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* @param p A buffer previously allocated by get_temporary_buffer.
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* @return None.
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*
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* Frees the memory pointed to by p.
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*/
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template <class _Tp>
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void return_temporary_buffer(_Tp* __p) {
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std::free(__p);
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}
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template <class _Tp1>
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struct auto_ptr_ref
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{
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_Tp1* _M_ptr;
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auto_ptr_ref(_Tp1* __p) : _M_ptr(__p) {}
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};
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/**
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* A simple smart pointer providing strict ownership semantics. (More later.)
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*/
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template <class _Tp>
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class auto_ptr
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{
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private:
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_Tp* _M_ptr;
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public:
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typedef _Tp element_type;
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explicit auto_ptr(_Tp* __p = 0) throw() : _M_ptr(__p) {}
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auto_ptr(auto_ptr& __a) throw() : _M_ptr(__a.release()) {}
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template <class _Tp1> auto_ptr(auto_ptr<_Tp1>& __a) throw()
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: _M_ptr(__a.release()) {}
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auto_ptr& operator=(auto_ptr& __a) throw() {
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reset(__a.release());
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return *this;
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}
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template <class _Tp1>
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auto_ptr& operator=(auto_ptr<_Tp1>& __a) throw() {
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reset(__a.release());
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return *this;
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}
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// Note: The C++ standard says there is supposed to be an empty throw
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// specification here, but omitting it is standard conforming. Its
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// presence can be detected only if _Tp::~_Tp() throws, but (17.4.3.6/2)
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// this is prohibited.
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~auto_ptr() { delete _M_ptr; }
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_Tp& operator*() const throw() {
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return *_M_ptr;
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}
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_Tp* operator->() const throw() {
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return _M_ptr;
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}
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_Tp* get() const throw() {
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return _M_ptr;
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}
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_Tp* release() throw() {
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_Tp* __tmp = _M_ptr;
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_M_ptr = 0;
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return __tmp;
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}
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void reset(_Tp* __p = 0) throw() {
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if (__p != _M_ptr) {
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delete _M_ptr;
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_M_ptr = __p;
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}
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}
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public:
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auto_ptr(auto_ptr_ref<_Tp> __ref) throw()
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: _M_ptr(__ref._M_ptr) {}
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auto_ptr& operator=(auto_ptr_ref<_Tp> __ref) throw() {
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if (__ref._M_ptr != this->get()) {
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delete _M_ptr;
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_M_ptr = __ref._M_ptr;
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}
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return *this;
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}
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template <class _Tp1> operator auto_ptr_ref<_Tp1>() throw()
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{ return auto_ptr_ref<_Tp>(this->release()); }
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template <class _Tp1> operator auto_ptr<_Tp1>() throw()
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{ return auto_ptr<_Tp1>(this->release()); }
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};
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} // namespace std
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#endif /* _CPP_MEMORY */
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// Local Variables:
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// mode:C++
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// End:
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