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Qt/5.6/include/QtConcurrent/qtconcurrentrunbase.h

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+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** 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 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QTCONCURRENT_RUNBASE_H
+#define QTCONCURRENT_RUNBASE_H
+
+#include <QtConcurrent/qtconcurrent_global.h>
+
+#ifndef QT_NO_CONCURRENT
+
+#include <QtCore/qfuture.h>
+#include <QtCore/qrunnable.h>
+#include <QtCore/qthreadpool.h>
+
+QT_BEGIN_NAMESPACE
+
+
+#ifndef Q_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()
+    {
+        return start(QThreadPool::globalInstance());
+    }
+
+    QFuture<T> start(QThreadPool *pool)
+    {
+        this->setThreadPool(pool);
+        this->setRunnable(this);
+        this->reportStarted();
+        QFuture<T> theFuture = this->future();
+        pool->start(this, /*m_priority*/ 0);
+        return theFuture;
+    }
+
+    void run() {}
+    virtual void runFunctor() = 0;
+};
+
+template <typename T>
+class RunFunctionTask : public RunFunctionTaskBase<T>
+{
+public:
+    void run()
+    {
+        if (this->isCanceled()) {
+            this->reportFinished();
+            return;
+        }
+#ifndef QT_NO_EXCEPTIONS
+        try {
+#endif
+            this->runFunctor();
+#ifndef QT_NO_EXCEPTIONS
+        } catch (QException &e) {
+            QFutureInterface<T>::reportException(e);
+        } catch (...) {
+            QFutureInterface<T>::reportException(QUnhandledException());
+        }
+#endif
+
+        this->reportResult(result);
+        this->reportFinished();
+    }
+    T result;
+};
+
+template <>
+class RunFunctionTask<void> : public RunFunctionTaskBase<void>
+{
+public:
+    void run()
+    {
+        if (this->isCanceled()) {
+            this->reportFinished();
+            return;
+        }
+#ifndef QT_NO_EXCEPTIONS
+        try {
+#endif
+            this->runFunctor();
+#ifndef QT_NO_EXCEPTIONS
+        } catch (QException &e) {
+            QFutureInterface<void>::reportException(e);
+        } catch (...) {
+            QFutureInterface<void>::reportException(QUnhandledException());
+        }
+#endif
+        this->reportFinished();
+    }
+};
+
+} //namespace QtConcurrent
+
+#endif //Q_QDOC
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_CONCURRENT
+
+#endif