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/*
* Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 or (at your option)
* version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef KEEPASSXC_ASYNCTASK_HPP
#define KEEPASSXC_ASYNCTASK_HPP
#include <QFuture>
#include <QFutureWatcher>
#include <QtConcurrent>
/**
* Asynchronously run computations outside the GUI thread.
*/
namespace AsyncTask
{
/**
* Wait for the given future without blocking the event loop.
*
* @param future future to wait for
* @return async task result
*/
template<typename FunctionObject>
typename std::result_of<FunctionObject()>::type waitForFuture(QFuture<typename std::result_of<FunctionObject()>::type> future)
{
QEventLoop loop;
QFutureWatcher<typename std::result_of<FunctionObject()>::type> watcher;
QObject::connect(&watcher, SIGNAL(finished()), &loop, SLOT(quit()));
watcher.setFuture(future);
loop.exec();
return future.result();
}
/**
* Run a given task and wait for it to finish without blocking the event loop.
*
* @param task std::function object to run
* @return async task result
*/
template<typename FunctionObject>
typename std::result_of<FunctionObject()>::type runAndWaitForFuture(FunctionObject task)
{
return waitForFuture<FunctionObject>(QtConcurrent::run(task));
}
}; // namespace AsyncTask
#endif //KEEPASSXC_ASYNCTASK_HPP
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