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Telegram/lib_base/base/match_method.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 <rpl/details/callable.h>
+
+namespace base {
+
+template <typename Data, typename Method, typename ...Methods>
+inline decltype(auto) match_method(
+		Data &&data,
+		Method &&method,
+		Methods &&...methods) {
+	using namespace rpl::details;
+	if constexpr (is_callable_plain_v<Method, Data&&>) {
+		return std::forward<Method>(method)(std::forward<Data>(data));
+	} else {
+		return match_method(
+			std::forward<Data>(data),
+			std::forward<Methods>(methods)...);
+	}
+}
+
+template <
+	typename Data1,
+	typename Data2,
+	typename Method,
+	typename ...Methods>
+inline decltype(auto) match_method2(
+		Data1 &&data1,
+		Data2 &&data2,
+		Method &&method,
+		Methods &&...methods) {
+	using namespace rpl::details;
+	if constexpr (is_callable_plain_v<Method, Data1&&, Data2&&>) {
+		return std::forward<Method>(method)(
+			std::forward<Data1>(data1),
+			std::forward<Data2>(data2));
+	} else {
+		return match_method2(
+			std::forward<Data1>(data1),
+			std::forward<Data2>(data2),
+			std::forward<Methods>(methods)...);
+	}
+}
+
+} // namespace base