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145 lines
3.8 KiB
145 lines
3.8 KiB
/****************************************************************************
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**
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** Definition of QGuardedPtr class
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**
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** Created : 990929
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**
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** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
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**
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** This file is part of the kernel module of the Qt GUI Toolkit.
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**
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** This file may be used under the terms of the GNU General
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** Public License versions 2.0 or 3.0 as published by the Free
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** Software Foundation and appearing in the files LICENSE.GPL2
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** and LICENSE.GPL3 included in the packaging of this file.
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** Alternatively you may (at your option) use any later version
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** of the GNU General Public License if such license has been
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** publicly approved by Trolltech ASA (or its successors, if any)
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** and the KDE Free Qt Foundation.
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**
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** Please review the following information to ensure GNU General
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** Public Licensing requirements will be met:
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** http://trolltech.com/products/qt/licenses/licensing/opensource/.
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** If you are unsure which license is appropriate for your use, please
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** review the following information:
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** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
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** or contact the sales department at sales@trolltech.com.
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**
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** This file may be used under the terms of the Q Public License as
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** defined by Trolltech ASA and appearing in the file LICENSE.QPL
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** included in the packaging of this file. Licensees holding valid Qt
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** Commercial licenses may use this file in accordance with the Qt
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** Commercial License Agreement provided with the Software.
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**
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** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
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** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
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** herein.
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**
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**********************************************************************/
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#ifndef QGUARDEDPTR_H
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#define QGUARDEDPTR_H
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#ifndef QT_H
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#include "qobject.h"
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#endif // QT_H
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// ### 4.0: rename to something without Private in it. Not really internal.
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class Q_EXPORT QGuardedPtrPrivate : public QObject, public QShared
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{
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Q_OBJECT
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public:
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QGuardedPtrPrivate( QObject* );
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~QGuardedPtrPrivate();
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QObject* object() const;
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void reconnect( QObject* );
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private slots:
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void objectDestroyed();
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private:
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QObject* obj;
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#if defined(Q_DISABLE_COPY) // Disabled copy constructor and operator=
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QGuardedPtrPrivate( const QGuardedPtrPrivate & );
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QGuardedPtrPrivate &operator=( const QGuardedPtrPrivate & );
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#endif
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};
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template <class T>
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class QGuardedPtr
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{
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public:
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QGuardedPtr() : priv( new QGuardedPtrPrivate( 0 ) ) {}
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QGuardedPtr( T* o) {
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priv = new QGuardedPtrPrivate( (QObject*)o );
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}
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QGuardedPtr(const QGuardedPtr<T> &p) {
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priv = p.priv;
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ref();
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}
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~QGuardedPtr() { deref(); }
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QGuardedPtr<T> &operator=(const QGuardedPtr<T> &p) {
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if ( priv != p.priv ) {
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deref();
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priv = p.priv;
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ref();
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}
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return *this;
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}
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QGuardedPtr<T> &operator=(T* o) {
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if ( priv && priv->count == 1 ) {
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priv->reconnect( (QObject*)o );
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} else {
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deref();
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priv = new QGuardedPtrPrivate( (QObject*)o );
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}
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return *this;
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}
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bool operator==( const QGuardedPtr<T> &p ) const {
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return (T*)(*this) == (T*) p;
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}
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bool operator!= ( const QGuardedPtr<T>& p ) const {
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return !( *this == p );
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}
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bool isNull() const { return !priv || !priv->object(); }
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T* operator->() const { return (T*)(priv?priv->object():0); }
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T& operator*() const { return *((T*)(priv?priv->object():0)); }
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operator T*() const { return (T*)(priv?priv->object():0); }
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private:
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void ref() { if (priv) priv->ref(); }
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void deref() {
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if ( priv && priv->deref() )
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delete priv;
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}
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QGuardedPtrPrivate* priv;
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};
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inline QObject* QGuardedPtrPrivate::object() const
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{
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return obj;
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}
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#define Q_DEFINED_QGUARDEDPTR
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#include "qwinexport.h"
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#endif
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