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sync.h
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sync.h
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/* BEGIN_COMMON_COPYRIGHT_HEADER
* (c)LGPL2+
*
* Flacon - audio File Encoder
* https://github.com/flacon/flacon
*
* Copyright: 2023
* Alexander Sokoloff <sokoloff.a@gmail.com>
*
* This 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 2.1 of the License, or (at your option) any later version.
* This 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* END_COMMON_COPYRIGHT_HEADER */
#ifndef SYNC_H
#define SYNC_H
#include <type_traits>
#include <QThread>
/************************************************
*
* **********************************************/
template <class Receiver, typename Lambda>
static void invoke(Receiver *receiver, Lambda &&lambda)
{
static_assert(std::is_base_of<QObject, Receiver>::value, "No Q_OBJECT in the class with the slot");
Q_STATIC_ASSERT_X(QtPrivate::HasQ_OBJECT_Macro<Receiver>::Value, "No Q_OBJECT in the class with the slot");
if (receiver->thread() == QThread::currentThread()) {
return lambda();
}
// We set receiver as context (third parameter), so lambda will be placed in a event loop of receiver.
// See https://doc.qt.io/qt-5/qobject.html#connect-5
QObject runner;
runner.connect(&runner, &QObject::destroyed, receiver, std::forward<Lambda>(lambda), Qt::BlockingQueuedConnection);
}
/************************************************
*
* **********************************************/
template <class Receiver, typename R, typename... Args>
R invoke(Receiver *receiver, R (Receiver::*slot)(Args...) const, Args... args)
{
if constexpr (std::is_void_v<R>) {
invoke(receiver, [receiver, slot, args...]() { std::mem_fn(slot)(receiver, args...); });
}
else {
R res;
invoke(receiver, [receiver, slot, &res, args...]() { res = std::mem_fn(slot)(receiver, args...); });
return res;
}
}
/************************************************
*
* **********************************************/
template <class Receiver, typename R, typename... Args>
R invoke(Receiver *receiver, R (Receiver::*slot)(Args...), Args... args)
{
if constexpr (std::is_void_v<R>) {
invoke(receiver, [receiver, slot, args...]() { std::mem_fn(slot)(receiver, args...); });
}
else {
R res;
invoke(receiver, [receiver, slot, &res, args...]() { res = std::mem_fn(slot)(receiver, args...); });
return res;
}
}
#endif // SYNC_H