/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** No Commercial Usage
** This file contains pre-release code and may not be distributed.
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** contained in the Technology Preview License Agreement accompanying
** this package.
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** GNU Lesser General Public License Usage
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** 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
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**
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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**
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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
