FutureWatchers.h

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/*****************************************************************************
 *
 * Copyright (C) 2009 - 2022  Bjarne von Horn <vh@igh.de>
 *
 * This file is part of the QtPdCom library.
 *
 * The QtPdCom library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * The QtPdCom library 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the QtPdCom Library. If not, see <http://www.gnu.org/licenses/>.
 *
 ****************************************************************************/
 
 
#ifndef QTPDCOM_FUTUREWATCHERS_H
#define QTPDCOM_FUTUREWATCHERS_H
 
#include <QFutureWatcher>
#include <pdcom5/Variable.h>
#include "VariableList.h"
#include "Export.h"
#include "FutureWatchersDetails.h"
 
 
namespace QtPdCom {
 
class QTPDCOM_PUBLIC VariableWatcher: public QFutureWatcher<PdCom::Variable>
{
    Q_OBJECT
 
  public:
    using QFutureWatcher<PdCom::Variable>::QFutureWatcher;
};
 
class QTPDCOM_PUBLIC ListWatcher: public QFutureWatcher<VariableList>
{
    Q_OBJECT
 
  public:
    using QFutureWatcher<VariableList>::QFutureWatcher;
};
 
 
template< class Result,class Object, class Callback>
inline QFutureWatcher<Result>& createWatcher(Object *obj, Callback &&callback)
{
    const auto watcher = new QFutureWatcher<Result>(obj);
    QObject::connect(
            watcher,
            &QFutureWatcherBase::finished,
            obj,
            [callback, watcher, obj]() {
                details::invoke<Result, Object>::call(callback, *obj, watcher);
                watcher->deleteLater();
            });
    QObject::connect(
            watcher,
            &QFutureWatcherBase::canceled,
            watcher,
            &QObject::deleteLater);
    return *watcher;
}
 
 
}  // namespace QtPdCom
 
#endif  // QTPDCOM_FUTUREWATCHERS_H