/* * Copyright (C) 2003 Apple Computer, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef KWQREFPTR_H_ #define KWQREFPTR_H_ template <class T> class KWQRefPtr { public: KWQRefPtr() : pointer(0) { } explicit KWQRefPtr(T*); ~KWQRefPtr() { unref(); } KWQRefPtr(const KWQRefPtr&); KWQRefPtr& operator=(const KWQRefPtr&); bool isNull() const { return pointer == 0; } T& operator*() const { return *pointer; } T* operator->() const { return pointer; } private: void unref(); void ref() const; T* pointer; }; template <class T> inline KWQRefPtr<T>::KWQRefPtr(T* p) : pointer(p) { ref(); } template <class T> inline KWQRefPtr<T>::KWQRefPtr(const KWQRefPtr& r) : pointer(r.pointer) { ref(); } template <class T> inline KWQRefPtr<T>& KWQRefPtr<T>::operator=(const KWQRefPtr& r) { r.ref(); unref(); pointer = r.pointer; return *this; } template <class T> inline void KWQRefPtr<T>::ref() const { if (pointer) { ++pointer->refCount; } } template <class T> inline void KWQRefPtr<T>::unref() { if (pointer && --pointer->refCount == 0) { delete pointer; } } #endif