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Telegram/lib_crl/crl/qt/crl_qt_async.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include <crl/common/crl_common_config.h>
+
+#ifdef CRL_USE_QT
+
+#include <crl/common/crl_common_utils.h>
+#include <crl/common/crl_common_sync.h>
+#include <type_traits>
+
+#include <QtCore/QThreadPool>
+
+namespace crl::details {
+
+template <typename Callable>
+class Runnable : public QRunnable {
+public:
+	Runnable(Callable &&callable) : _callable(std::move(callable)) {
+	}
+
+	void run() override {
+		_callable();
+	}
+
+private:
+	Callable _callable;
+
+};
+
+template <typename Callable>
+inline auto create_runnable(Callable &&callable) {
+	if constexpr (std::is_reference_v<Callable>) {
+		auto copy = callable;
+		return create_runnable(std::move(copy));
+	} else {
+		return new Runnable<Callable>(std::move(callable));
+	}
+}
+
+template <typename Callable>
+inline void async_any(Callable &&callable) {
+	if (const auto pool = QThreadPool::globalInstance()) {
+		pool->start(create_runnable(std::forward<Callable>(callable)));
+	}
+}
+
+inline void async_plain(void (*callable)(void*), void *argument) {
+	async_any([=] {
+		callable(argument);
+	});
+}
+
+} // namespace crl::details
+
+namespace crl {
+
+template <
+	typename Callable,
+	typename Return = decltype(std::declval<Callable>()())>
+inline void async(Callable &&callable) {
+	details::async_any(std::forward<Callable>(callable));
+}
+
+} // namespace crl
+
+#endif // CRL_USE_QT