Prevent issues when including TSchemaHelper.h before both RTypes.h and TGenericClassInfo.h:

remove all trace of Get/SetFun
(See comments in the header file for details).


git-svn-id: http://root.cern.ch/svn/root/trunk@42145 27541ba8-7e3a-0410-8455-c3a389f83636

core/meta/inc/TSchemaHelper.h

 // @(#)root/core:$Id$
 // author: Lukasz Janyst <ljanyst@cern.ch>
 
-#ifndef ROOT_TSchemaHelper
-#define ROOT_TSchemaHelper
+/*************************************************************************
+ * Copyright (C) 1995-2010, Rene Brun, Fons Rademakers and al.           *
+ * All rights reserved.                                                  *
+ *                                                                       *
+ * For the licensing terms see $ROOTSYS/LICENSE.                         *
+ * For the list of contributors see $ROOTSYS/README/CREDITS.             *
+ *************************************************************************/
 
-#include <string>
+// This include must be outside of the code guard because
+// Rtypes.h includes TGenericClassInfo.h which includes
+// TSchemaHelper.h (this header file) and really need the
+// definition of ROOT::TSchemaHelper.   So in this case,
+// we need the indirect #include to really do the declaration
+// and the direct #include to be a noop.
 #ifndef ROOT_Rtypes
 #include "Rtypes.h"
 #endif
 
+#ifndef ROOT_TSchemaHelper
+#define ROOT_TSchemaHelper
+
+#include <string>
+
 namespace ROOT
 {
    struct TSchemaHelper