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