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// Copyright 2017 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <concepts>
#include <functional>
#include <optional>
#include <QMetaObject>
#include "Common/OneShotEvent.h"
// QWidget and subclasses are not thread-safe! This helper takes arbitrary code from any thread,
// safely runs it on the appropriate GUI thread, waits for it to finish, and returns the result.
//
// If the target object is destructed before the code gets to run the function will return nullopt.
auto RunOnObject(QObject* object, std::invocable<> auto&& functor)
{
Common::OneShotEvent task_complete;
std::optional<decltype(functor())> result;
QMetaObject::invokeMethod(
object, [&, guard = Common::ScopedSetter{&task_complete}] { result = functor(); });
// Wait for the lambda to go out of scope. The result may or may not have been assigned.
task_complete.Wait();
return result;
}
template <std::derived_from<QObject> Receiver>
auto RunOnObject(Receiver* obj, auto Receiver::* func)
{
return RunOnObject(obj, std::bind(func, obj));
}
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