finishing first step of serialization : the basics

Game/Entity/Entity.cpp

@@ -2,7 +2,19 @@
 
 #include <Core/Common/serialization.h>
 
-DEFINE_CLASS_VERSIONED(Entity, 1, nullptr, nullptr)
+namespace
+{
+    void serialize_entity(Archive& ar, uint16 /*version*/, void* payload)
+    {
+        Assert(payload);
+        Entity* entity = static_cast<Entity*>(payload);
+
+        SERIALIZE(ar, id, entity->ID);
+        SERIALIZE(ar, position, entity->position);
+    }
+} // namespace
+
+DEFINE_CLASS_VERSIONED(Entity, 1, nullptr, serialize_entity)
 
 DEFINE_ENTITY_VERSIONED(Inert, 1, nullptr)
 
@@ -11,9 +23,6 @@ void serialize(Archive& ar, NonNullPtr<Entity> entity)
     // Entity fields
     serialize(ar, Entity::kind, entity.Get());
 
-    SERIALIZE(ar, id, entity->ID);
-    SERIALIZE(ar, position, entity->position);
-
     // Derived fields
     if (entity->derived_kind != nullptr && entity->derived != nullptr)
     {