init

Telegram/lib_crl/crl/common/crl_common_on_main.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>
+
+#include <crl/common/crl_common_queue.h>
+#include <atomic>
+
+#ifndef CRL_USE_COMMON_QUEUE
+#define CRL_USE_COMMON_QUEUE
+#endif // !CRL_USE_COMMON_QUEUE
+
+namespace crl::details {
+
+extern queue *MainQueue;
+extern std::atomic<int> MainQueueCounter;
+
+class main_queue_pointer {
+public:
+	main_queue_pointer() {
+		grab();
+	}
+
+	void create(main_queue_processor processor);
+
+	explicit operator bool() const {
+		return _pointer != nullptr;
+	}
+
+	queue *operator->() const {
+		return _pointer;
+	}
+
+	~main_queue_pointer() {
+		ungrab();
+	}
+
+private:
+	void grab();
+	void ungrab();
+
+	queue *_pointer = nullptr;
+
+};
+
+} // namespace crl::details
+
+namespace crl {
+
+void init_main_queue(main_queue_processor processor);
+
+inline void wrap_main_queue(main_queue_wrapper wrapper) {
+	// If wrapping is needed here, it can be done inside processor.
+}
+
+template <typename Callable>
+inline void on_main(Callable &&callable) {
+	if (const auto main = details::main_queue_pointer()) {
+		main->async(std::forward<Callable>(callable));
+	}
+}
+
+template <typename Callable>
+inline void on_main_sync(Callable &&callable) {
+	if (const auto main = details::main_queue_pointer()) {
+		main->sync(std::forward<Callable>(callable));
+	}
+}
+
+} // namespace crl