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