use #pragma once

include/ifilter.h

@@ -19,8 +19,7 @@
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-#if !defined( INCLUDED_IFILTER_H )
-#define INCLUDED_IFILTER_H
+#pragma once
 
 #include "generic/constant.h"
 
@@ -86,5 +85,3 @@ typedef GlobalModuleRef<FilterSystem> GlobalFilterModuleRef;
 inline FilterSystem& GlobalFilterSystem(){
 	return GlobalFilterModule::getTable();
 }
-
-#endif