fields builder

include/sp/default/DefaultPacket.h

@@ -13,4 +13,10 @@ using PacketMessage = Message<
 	option::Handler<PacketHandler>								// add dispatch() operation
 	>;
 
+#define DeclarePacket(packetName) class packetName##Packet : public sp::MessageBase<sp::PacketMessage,\
+	sp::option::StaticNumIdImpl<packetName>,		\
+							sp::option::DispatchImpl<packetName##Packet>,	\
+							sp::option::FieldsImpl<packetName##Fields>		\
+							> {}
+
 }  // namespace sp

include/sp/protocol/Field.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <sp/common/DataBuffer.h>
+#include <sp/protocol/Templates.h>
 
 namespace sp {
 
@@ -62,4 +63,18 @@ class FieldWriter {
 	DataBuffer& m_Buffer;
 };
 
+template <typename... TFields>
+struct FieldsBuilder {};
+
+template <>
+struct FieldsBuilder<> {
+	using Type = std::tuple<>;
+};
+
+template <typename TField, typename... TFields>
+struct FieldsBuilder<TField, TFields...> {
+	using Type = sp::tuple_cat_t<std::tuple<Field<TField>>, typename FieldsBuilder<TFields...>::Type>;
+};
+
+
 }  // namespace sp