Use forward declaration of THashList

git-svn-id: http://root.cern.ch/svn/root/trunk@17658 27541ba8-7e3a-0410-8455-c3a389f83636

eg/inc/TDatabasePDG.h

-// @(#)root/eg:$Name:  $:$Id: TDatabasePDG.h,v 1.12 2006/05/23 04:47:36 brun Exp $
+// @(#)root/eg:$Name:  $:$Id: TDatabasePDG.h,v 1.13 2006/08/24 16:31:21 rdm Exp $
 // Author: Pasha Murat   12/02/99
 
 /*************************************************************************
@@ -15,13 +15,12 @@
 #ifndef ROOT_TParticlePDG
 #include "TParticlePDG.h"
 #endif
-#ifndef ROOT_THashList
-#include "THashList.h"
-#endif
 #ifndef ROOT_TParticleClassPDG
 #include "TParticleClassPDG.h"
 #endif
 
+class THashList;
+
 class TDatabasePDG: public TNamed {
 
 protected:

eg/src/TDatabasePDG.cxx

-// @(#)root/eg:$Name:  $:$Id: TDatabasePDG.cxx,v 1.26 2006/10/20 09:36:47 rdm Exp $
+// @(#)root/eg:$Name:  $:$Id: TDatabasePDG.cxx,v 1.27 2006/11/16 17:17:37 rdm Exp $
 // Author: Pasha Murat   12/02/99
 
 /*************************************************************************
@@ -15,6 +15,7 @@
 
 #include "TROOT.h"
 #include "TEnv.h"
+#include "THashList.h"
 #include "TSystem.h"
 #include "TDatabasePDG.h"
 #include "TDecayChannel.h"