add msg.ToString()

include/sp/protocol/message/MessagesImpl.h

@@ -1,8 +1,24 @@
 #pragma once
 
 namespace sp {
+
+template <typename TBase, typename... TOptions>
+class MessageBase;
+
 namespace details {
 
+template <typename TBase, typename... TOptions>
+std::string PrintMessage(const MessageBase<TBase, TOptions...>& a_Message);
+
+// ID information chunk
+template <typename TBase, typename TActual>
+class MessageImplToStringBase : public TBase {
+  protected:
+	virtual std::string ToStringImpl() const override {
+		return PrintMessage(static_cast<const TActual&>(*this));
+	}
+};
+
 
 
 // ID information chunk
@@ -18,6 +34,8 @@ class MessageImplStaticNumIdBase : public TBase {
 	}
 };
 
+
+
 // Dispatch implementation chunk
 template <typename TBase, typename TActual>
 class MessageImplDispatchBase : public TBase {