move code out of macro

move common code into ActorUtil::Create

stepmania/src/ActorUtil.cpp

@@ -40,8 +40,14 @@ Actor* ActorUtil::Create( const RString& sClassName, const XNode* pNode, Actor *
 	map<RString,CreateActorFn>::iterator iter = g_pmapRegistrees->find( sClassName );
 	ASSERT_M( iter != g_pmapRegistrees->end(), ssprintf("Actor '%s' is not registered.",sClassName.c_str()) );
 
-	CreateActorFn pfn = iter->second;
-	return (*pfn)( pNode, pParentActor );
+	const CreateActorFn &pfn = iter->second;
+	Actor *pRet = pfn();
+
+	if( pParentActor )
+		pRet->SetParent( pParentActor );
+
+	pRet->LoadFromNode( pNode );
+	return pRet;
 }
 
 void ActorUtil::ResolvePath( RString &sPath, const RString &sName )

stepmania/src/ActorUtil.h

@@ -8,19 +8,15 @@
 
 class XNode;
 
-typedef Actor* (*CreateActorFn)(const XNode* pNode, Actor* pParent);
+typedef Actor* (*CreateActorFn)();
+
+template<typename T>
+Actor *CreateActor() { return new T; }
 
 // Each Actor class should have a REGISTER_ACTOR_CLASS in its CPP file.
 #define REGISTER_ACTOR_CLASS_WITH_NAME( className, externalClassName ) \
-	Actor* Create##className(const XNode* pNode, Actor* pParent) { \
-		className *pRet = new className; \
-		if( pParent ) \
-			pRet->SetParent( pParent ); \
-		pRet->LoadFromNode(pNode); \
-		return pRet; } \
-	class Register##className { \
-	public: \
-		Register##className() { ActorUtil::Register(#externalClassName,Create##className); } \
+	struct Register##className { \
+		Register##className() { ActorUtil::Register(#externalClassName, CreateActor<className>); } \
 	}; \
 	static Register##className register##className; \
 	Actor *className::Copy() const { return new className(*this); }