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# qtconcurrentrunbase.h

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    00001 /****************************************************************************
    00002 **
    00003 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
    00004 ** All rights reserved.
    00005 ** Contact: Nokia Corporation (qt-info@nokia.com)
    00006 **
    00007 ** This file is part of the QtCore module of the Qt Toolkit.
    00008 **
    00009 ** $QT_BEGIN_LICENSE:LGPL$
    00010 ** Commercial Usage
    00011 ** Licensees holding valid Qt Commercial licenses may use this file in
    00012 ** accordance with the Qt Commercial License Agreement provided with the
    00013 ** Software or, alternatively, in accordance with the terms contained in
    00014 ** a written agreement between you and Nokia.
    00015 **
    00016 ** GNU Lesser General Public License Usage
    00017 ** Alternatively, this file may be used under the terms of the GNU Lesser
    00018 ** General Public License version 2.1 as published by the Free Software
    00019 ** Foundation and appearing in the file LICENSE.LGPL included in the
    00020 ** packaging of this file.  Please review the following information to
    00021 ** ensure the GNU Lesser General Public License version 2.1 requirements
    00022 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    00023 **
    00024 ** In addition, as a special exception, Nokia gives you certain additional
    00025 ** rights.  These rights are described in the Nokia Qt LGPL Exception
    00026 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this module.
    00027 **
    00028 ** GNU General Public License Usage
    00029 ** Alternatively, this file may be used under the terms of the GNU
    00030 ** General Public License version 3.0 as published by the Free Software
    00031 ** Foundation and appearing in the file LICENSE.GPL included in the
    00032 ** packaging of this file.  Please review the following information to
    00033 ** ensure the GNU General Public License version 3.0 requirements will be
    00034 ** met: http://www.gnu.org/copyleft/gpl.html.
    00035 **
    00036 ** If you have questions regarding the use of this file, please contact
    00037 ** Nokia at qt-info@nokia.com.
    00038 ** $QT_END_LICENSE$
    00039 **
    00040 ****************************************************************************/
    00041
    00042 #ifndef QTCONCURRENT_RUNBASE_H
    00043 #define QTCONCURRENT_RUNBASE_H
    00044
    00045 #include <QtCore/qglobal.h>
    00046
    00047 #ifndef QT_NO_CONCURRENT
    00048
    00049 #include <QtCore/qfuture.h>
    00050 #include <QtCore/qrunnable.h>
    00051 #include <QtCore/qthreadpool.h>
    00052
    00053 QT_BEGIN_HEADER
    00054 QT_BEGIN_NAMESPACE
    00055
    00056 QT_MODULE(Core)
    00057
    00058 #ifndef qdoc
    00059
    00060 namespace QtConcurrent {
    00061
    00062 template <typename T>
    00063 struct SelectSpecialization
    00064 {
    00065     template <class Normal, class Void>
    00066     struct Type { typedef Normal type; };
    00067 };
    00068
    00069 template <>
    00070 struct SelectSpecialization<void>
    00071 {
    00072     template <class Normal, class Void>
    00073     struct Type { typedef Void type; };
    00074 };
    00075
    00076 template <typename T>
    00077 class RunFunctionTaskBase : public QFutureInterface<T> , public QRunnable
    00078 {
    00079 public:
    00080     QFuture<T> start()
    00081     {
    00082         this->setRunnable(this);
    00083         this->reportStarted();
    00084         QFuture<T> future = this->future();
    00085         QThreadPool::globalInstance()->start(this, /*m_priority*/ 0);
    00086         return future;
    00087     }
    00088
    00089     void run() {}
    00090     virtual void runFunctor() = 0;
    00091 };
    00092
    00093 template <typename T>
    00094 class RunFunctionTask : public RunFunctionTaskBase<T>
    00095 {
    00096 public:
    00097     void run()
    00098     {
    00099         if (this->isCanceled()) {
    00100             this->reportFinished();
    00101             return;
    00102         }
    00103         this->runFunctor();
    00104         this->reportResult(result);
    00105         this->reportFinished();
    00106     }
    00107     T result;
    00108 };
    00109
    00110 template <>
    00111 class RunFunctionTask<void> : public RunFunctionTaskBase<void>
    00112 {
    00113 public:
    00114     void run()
    00115     {
    00116         if (this->isCanceled()) {
    00117             this->reportFinished();
    00118             return;
    00119         }
    00120         this->runFunctor();
    00121         this->reportFinished();
    00122     }
    00123 };
    00124
    00125 } //namespace QtConcurrent
    00126
    00127 #endif //qdoc
    00128
    00129 QT_END_NAMESPACE
    00130 QT_END_HEADER
    00131
    00132 #endif // QT_NO_CONCURRENT
    00133
    00134 #endif