160 lines
4.3 KiB
C++
160 lines
4.3 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtConcurrent module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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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
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QTCONCURRENT_RUNBASE_H
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#define QTCONCURRENT_RUNBASE_H
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#include <QtConcurrent/qtconcurrent_global.h>
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#ifndef QT_NO_CONCURRENT
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#include <QtCore/qfuture.h>
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#include <QtCore/qrunnable.h>
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#include <QtCore/qthreadpool.h>
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#include <type_traits>
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#include <utility>
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QT_BEGIN_NAMESPACE
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#ifndef Q_QDOC
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namespace QtConcurrent {
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template <typename T>
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struct SelectSpecialization
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{
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template <class Normal, class Void>
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struct Type { typedef Normal type; };
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};
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template <>
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struct SelectSpecialization<void>
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{
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template <class Normal, class Void>
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struct Type { typedef Void type; };
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};
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struct TaskStartParameters
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{
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QThreadPool *threadPool = QThreadPool::globalInstance();
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int priority = 0;
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};
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template <typename T>
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class RunFunctionTaskBase : public QRunnable
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{
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public:
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QFuture<T> start()
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{
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return start(TaskStartParameters());
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}
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QFuture<T> start(const TaskStartParameters ¶meters)
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{
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promise.setThreadPool(parameters.threadPool);
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promise.setRunnable(this);
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promise.reportStarted();
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QFuture<T> theFuture = promise.future();
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parameters.threadPool->start(this, parameters.priority);
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return theFuture;
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}
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// For backward compatibility
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QFuture<T> start(QThreadPool *pool) { return start({pool, 0}); }
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void run() override
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{
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if (promise.isCanceled()) {
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promise.reportFinished();
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return;
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}
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#ifndef QT_NO_EXCEPTIONS
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try {
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#endif
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runFunctor();
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#ifndef QT_NO_EXCEPTIONS
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} catch (QException &e) {
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promise.reportException(e);
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} catch (...) {
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promise.reportException(QUnhandledException());
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}
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#endif
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reportResult();
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promise.reportFinished();
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}
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protected:
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virtual void runFunctor() = 0;
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virtual void reportResult() {}
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QFutureInterface<T> promise;
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};
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template <typename T>
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class RunFunctionTask : public RunFunctionTaskBase<T>
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{
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protected:
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void reportResult() override
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{
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if constexpr (std::is_move_constructible_v<T>)
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this->promise.reportAndMoveResult(std::move(result));
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else if constexpr (std::is_copy_constructible_v<T>)
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this->promise.reportResult(result);
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}
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T result;
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};
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template <>
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class RunFunctionTask<void> : public RunFunctionTaskBase<void> {};
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} //namespace QtConcurrent
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#endif //Q_QDOC
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QT_END_NAMESPACE
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#endif // QT_NO_CONCURRENT
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#endif
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