/**************************************************************************** ** $Id: qt/src/kernel/qguardedptr.h 2.1.1 edited 2000-03-24 $ ** ** Definition of QGuardedPtr class ** ** Created : 990929 ** ** Copyright (C) 1992-2000 Troll Tech AS. All rights reserved. ** ** This file is part of the Qt GUI Toolkit. ** ** This file may be distributed under the terms of the Q Public License ** as defined by Troll Tech AS of Norway and appearing in the file ** LICENSE.QPL included in the packaging of this file. ** ** Licensees holding valid Qt Professional Edition licenses may use this ** file in accordance with the Qt Professional Edition License Agreement ** provided with the Qt Professional Edition. ** ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for ** information about the Professional Edition licensing, or see ** http://www.trolltech.com/qpl/ for QPL licensing information. ** *****************************************************************************/ #ifndef QGUARDEDPTR_H #define QGUARDEDPTR_H #ifndef QT_H #include "qobject.h" #endif // QT_H class Q_EXPORT QGuardedPtrPrivate : public QObject, public QShared { Q_OBJECT public: QGuardedPtrPrivate( QObject*); ~QGuardedPtrPrivate(); QObject* object() const; private slots: void objectDestroyed(); private: QObject* obj; }; template <class T> class Q_EXPORT QGuardedPtr { public: QGuardedPtr() { priv = new QGuardedPtrPrivate( 0 ); } QGuardedPtr( T* o) { priv = new QGuardedPtrPrivate( o ); } QGuardedPtr(const QGuardedPtr<T> &p) { priv = p.priv; ref(); } ~QGuardedPtr() { deref(); } QGuardedPtr<T> &operator=(const QGuardedPtr<T> &p) { ((QGuardedPtr<T>) p).ref(); deref(); priv = p.priv; return *this; } QGuardedPtr<T> &operator=(T* o) { deref(); priv = new QGuardedPtrPrivate( o ); return *this; } bool operator==( const QGuardedPtr<T> &p ) const { return priv->object() == p.priv->object(); } bool operator!= ( const QGuardedPtr<T>& p ) const { return !( *this == p ); } bool isNull() const { return !priv->object(); } T* operator->() const { return (T*) priv->object(); } T& operator*() const { return *( (T*)priv->object() ); } operator T*() const { return (T*) priv->object(); } private: void ref() { priv->ref(); } void deref() { if ( priv->deref() ) delete priv; } QGuardedPtrPrivate* priv; }; inline QObject* QGuardedPtrPrivate::object() const { return obj; } #endif
Copyright © 2000 Troll Tech | Trademarks | Qt version 2.1.1
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