working message factory

include/sp/protocol/MessageFactory.h

@@ -0,0 +1,65 @@
+#pragma once
+
+#include <array>
+#include <functional>
+#include <iostream>
+#include <memory>
+
+namespace sp {
+
+namespace details {
+
+template <typename TBase>
+using ArrayType = std::vector<std::function<std::unique_ptr<TBase>(void)>>;
+
+
+
+template <typename TBase, typename... TMessages>
+struct ArrayFiller {};
+
+template <typename TBase, typename... TMessages>
+struct ArrayFiller<TBase, std::tuple<TMessages...>> {
+	static void ArrayAppend(details::ArrayType<TBase>& array) {
+		ArrayFiller<TBase, TMessages...>::ArrayAppend(array);
+	}
+};
+
+template <typename TBase, typename TMessage, typename... TMessages>
+struct ArrayFiller<TBase, TMessage, TMessages...> {
+	static void ArrayAppend(details::ArrayType<TBase>& array) {
+		ArrayFiller<TBase, TMessage>::ArrayAppend(array);
+		ArrayFiller<TBase, TMessages...>::ArrayAppend(array);
+	}
+};
+
+template <typename TBase, typename TMessage>
+struct ArrayFiller<TBase, TMessage> {
+	static void ArrayAppend(details::ArrayType<TBase>& array) {
+		array.push_back([]() -> std::unique_ptr<TBase> { return std::make_unique<TMessage>(); });
+	}
+};
+
+}  // namespace details
+
+template <typename TBase, typename TTMessages>
+class MessageFactory {
+  public:
+	using IdType = typename TBase::MsgIdType;
+
+	MessageFactory() {
+		details::ArrayFiller<TBase, TTMessages>::ArrayAppend(m_Factory);
+	}
+
+	std::unique_ptr<TBase> CreateMessage(IdType id) {
+		if (id >= m_Factory.size())
+			return nullptr;
+		return m_Factory.at(id)();
+	}
+
+  private:
+	details::ArrayType<TBase> m_Factory;
+};
+
+
+
+}  // namespace sp