/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtCore module of the Qt Toolkit.

**

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** 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

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** $QT_END_LICENSE$

**

****************************************************************************/

#ifndef QTCONCURRENT_RUNBASE_H

#define QTCONCURRENT_RUNBASE_H

#include <QtCore/qglobal.h>

#ifndef QT_NO_CONCURRENT

#include <QtCore/qfuture.h>

#include <QtCore/qrunnable.h>

#include <QtCore/qthreadpool.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Core)

#ifndef qdoc

namespace QtConcurrent {

template <typename T>

struct SelectSpecialization

{

    template <class Normal, class Void>

    struct Type { typedef Normal type; };

};

template <>

struct SelectSpecialization<void>

{

    template <class Normal, class Void>

    struct Type { typedef Void type; };

};

template <typename T>

class RunFunctionTaskBase : public QFutureInterface<T> , public QRunnable

{

public:

    QFuture<T> start()

    {

        this->setRunnable(this);

        this->reportStarted();

        QFuture<T> future = this->future();

        QThreadPool::globalInstance()->start(this, /*m_priority*/ 0);

        return future;

    }

    void run() {}

    virtual void runFunctor() = 0;

};

template <typename T>

class RunFunctionTask : public RunFunctionTaskBase<T>

{

public:

    void run()

    {

        if (this->isCanceled()) {

            this->reportFinished();

            return;

        }

        this->runFunctor();

        this->reportResult(result);

        this->reportFinished();

    }

    T result;

};

template <>

class RunFunctionTask<void> : public RunFunctionTaskBase<void>

{

public:

    void run()

    {

        if (this->isCanceled()) {

            this->reportFinished();

            return;

        }

        this->runFunctor();

        this->reportFinished();

    }

};

} //namespace QtConcurrent

#endif //qdoc

QT_END_NAMESPACE

QT_END_HEADER

#endif // QT_NO_CONCURRENT

#endif