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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qmlcleanup_p.h"
+
+#include "qmlengine_p.h"
+
+/*!
+\internal
+\class QmlCleanup
+\brief The QmlCleanup provides a callback when a QmlEngine is deleted.
+
+Any object that needs cleanup to occur before the QmlEngine's QScriptEngine is
+destroyed should inherit from QmlCleanup. The clear() virtual method will be
+called by QmlEngine just before it deletes the QScriptEngine.
+*/
+
+/*!
+\internal
+
+Create a QmlCleanup for \a engine
+*/
+QmlCleanup::QmlCleanup(QmlEngine *engine)
+: prev(0), next(0)
+{
+ if (!engine)
+ return;
+
+ QmlEnginePrivate *p = QmlEnginePrivate::get(engine);
+
+ if (p->cleanup) next = p->cleanup;
+ p->cleanup = this;
+ prev = &p->cleanup;
+ if (next) next->prev = &next;
+}
+
+/*!
+\internal
+*/
+QmlCleanup::~QmlCleanup()
+{
+ if (prev) *prev = next;
+ if (next) next->prev = prev;
+ prev = 0;
+ next = 0;
+}
+