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114 lines
2.0 KiB
C++
114 lines
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#pragma once
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template <class T>
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class own_ptr
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/*
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...implements strict ownership model (as |auto_ptr| once did, before it was ruined).
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*/
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{
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public:
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explicit
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own_ptr( T* ptr = 0 )
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: _ptr(ptr)
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{
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// nothing else to do
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}
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own_ptr( own_ptr<T>& P )
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: _ptr( P.release() )
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{
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// nothing else to do
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}
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~own_ptr()
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{
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delete _ptr;
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}
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own_ptr<T>&
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operator=( T* P )
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{
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if ( _ptr != P )
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{
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delete _ptr;
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_ptr = P;
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}
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return *this;
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}
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own_ptr<T>&
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operator=( own_ptr<T>& P )
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{
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return operator=( P.release() ); // (also) handles the self-assignment case
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}
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T&
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operator*() const
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{
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// PRECONDITION( _ptr );
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//#if !defined(__NO_bad_dereference__)
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// if ( !_ptr )
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// throw bad_dereference();
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//#endif
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return *_ptr;
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}
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T*
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operator->() const
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{
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// PRECONDITION( _ptr );
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//#if !defined(__NO_bad_dereference__)
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// if ( !_ptr )
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// throw bad_dereference();
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//#endif
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return _ptr;
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}
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T*
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get() const
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{
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return _ptr;
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}
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T*
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release()
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{
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T* P = _ptr;
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_ptr = 0;
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return P;
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}
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bool
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is_void() const
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{
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return _ptr == 0;
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}
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private:
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T* _ptr;
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};
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