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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Qt Toolkit - qguardedptr.h include file</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: white; color: black; }--></style></head><body bgcolor="#ffffff"><table width="100%"><tr><td><a href="index.html"><img width="100" height="100" src="qtlogo.png"alt="Home" border="0"><img width="100"height="100" src="face.png" alt="Home" border="0"></a><td valign="top"><div align="right"><img src="dochead.png" width="472" height="27"><br><a href="classes.html"><b>Classes</b></a>- <a href="annotated.html">Annotated</a>- <a href="hierarchy.html">Tree</a>- <a href="functions.html">Functions</a>- <a href="index.html">Home</a>- <a href="topicals.html"><b>Structure</b> <font face="Arial,Helvetica,Geneva,Swiss,SunSans-Regular" align="center" size=32>Qte</font></a></div></table><h1 align=center>qguardedptr.h</h1><br clear="all">This is the verbatim text of the qguardedptr.h include file. It isprovided only for illustration; the copyrightremains with Trolltech.<hr><pre>/****************************************************************************** $Id: qt/src/kernel/qguardedptr.h 2.3.8 edited 2004-05-12 $**** Definition of QGuardedPtr class**** Created : 990929**** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.**** This file is part of the kernel module of the Qt GUI Toolkit.**** This file may be distributed under the terms of the Q Public License** as defined by Trolltech AS of Norway and appearing in the file** LICENSE.QPL included in the packaging of this file.**** This file may be distributed and/or modified under the terms of the** GNU General Public License version 2 as published by the Free Software** Foundation and appearing in the file LICENSE.GPL included in the** packaging of this file.**** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition** 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** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.**** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for** information about Qt Commercial License Agreements.** See http://www.trolltech.com/qpl/ for QPL licensing information.** See http://www.trolltech.com/gpl/ for GPL licensing information.**** Contact info@trolltech.com if any conditions of this licensing are** not clear to you.************************************************************************/#ifndef QGUARDEDPTR_H#define QGUARDEDPTR_H#ifndef QT_H#include "qobject.h"#endif // QT_Hclass Q_EXPORT QGuardedPtrPrivate : public <a href="qobject.html">QObject</a>, public <a href="qshared.html">QShared</a>{ Q_OBJECTpublic: 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) {#if defined(Q_TEMPLATE_NEEDS_EXPLICIT_CONVERSION) priv = new QGuardedPtrPrivate( (QObject*)o );#else priv = new QGuardedPtrPrivate( o );#endif } 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) { deref();#if defined(Q_TEMPLATE_NEEDS_EXPLICIT_CONVERSION) priv = new QGuardedPtrPrivate( (QObject*)o );#else priv = new QGuardedPtrPrivate( o );#endif 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</pre><p><address><hr><div align="center"><table width="100%" cellspacing="0" border="0"><tr><td>Copyright ⌨️ 快捷键说明
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