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/****************************************************************************
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/
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** This file is part of the QtQml module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL$
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this
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** file. Please review the following information to ensure the GNU Lesser
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** General Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU General
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** Public License version 3.0 as published by the Free Software Foundation
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** and appearing in the file LICENSE.GPL included in the packaging of this
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** file. Please review the following information to ensure the GNU General
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** Public License version 3.0 requirements will be met:
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** http://www.gnu.org/copyleft/gpl.html.
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** Alternatively, this file may be used in accordance with the terms and
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** conditions contained in a signed written agreement between you and Nokia.
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****************************************************************************/
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#ifndef APIPREAMBLE_P_H
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#define APIPREAMBLE_P_H
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#include <private/qv8_p.h>
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#include "qv8engine_p.h"
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Class used to switch to the right isolate. It does the same thing as v8::Isolate::Scope but
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it checks for a null engine.
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\attention We decided to put context switching "up" which means that it should be as high
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as possible on call stack. And it should be switched at most once per public API function call.
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class QScriptIsolate {
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// OperationMode was introduced to reduce number of checking for a null engine pointer. If we
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// know that given pointer is not null than we should pass NotNullEngine as constructor argument
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// that would nicely remove checking on compilation time.
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enum OperationMode {Default, NotNullEngine};
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inline QScriptIsolate(const QV8Engine *engine, const OperationMode mode = Default)
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if (m_mode == NotNullEngine || m_engine) {
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m_engine->context()->Enter();
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inline ~QScriptIsolate()
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if (m_mode == NotNullEngine || m_engine) {
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m_engine->context()->Exit();
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Q_DISABLE_COPY(QScriptIsolate);
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const QV8Engine *m_engine;
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const OperationMode m_mode;
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#endif // APIPREAMBLE_P_H