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Telegram/lib_crl/crl/common/crl_common_utils.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 <utility>
+
+namespace crl {
+
+using main_queue_processor = void(*)(void (*callable)(void*), void *argument);
+using main_queue_wrapper = void(*)(void (*callable)(void*), void *argument);
+
+} // namespace crl
+
+namespace crl::details {
+
+using true_t = char;
+struct false_t {
+	char data[2];
+};
+
+template <typename Return, typename ...Args>
+struct check_plain_function {
+	static false_t check(...);
+	static true_t check(Return(*)(Args...));
+};
+
+template <typename Callable, typename Return, typename ...Args>
+constexpr bool is_plain_function_v = sizeof(
+	check_plain_function<Return, Args...>::check(
+		std::declval<Callable>())) == sizeof(true_t);
+
+template <typename Callable>
+class finalizer {
+public:
+	explicit finalizer(Callable &&callable)
+	: _callable(std::move(callable)) {
+	}
+	finalizer(const finalizer &other) = delete;
+	finalizer &operator=(const finalizer &other) = delete;
+	finalizer(finalizer &&other)
+	: _callable(std::move(other._callable))
+	, _disabled(std::exchange(other._disabled, true)) {
+	}
+	finalizer &operator=(finalizer &&other) {
+		_callable = std::move(other._callable);
+		_disabled = std::exchange(other._disabled, true);
+		return *this;
+	}
+	~finalizer() {
+		if (!_disabled) {
+			_callable();
+		}
+	}
+
+private:
+	Callable _callable;
+	bool _disabled = false;
+
+};
+
+template <
+	typename Callable,
+	typename = std::enable_if_t<!std::is_reference_v<Callable>>>
+finalizer<Callable> finally(Callable &&callable) {
+	return finalizer<Callable>{ std::move(callable) };
+}
+
+} // namespace crl::details