diff -u -r1.1 -r1.2
--- CellIDDecoder.h	10 Mar 2006 16:23:15 -0000	1.1
+++ CellIDDecoder.h	22 Mar 2006 11:52:46 -0000	1.2
@@ -4,6 +4,7 @@

 //#include <vector>
 //#include "EVENT/LCObject.h"
 #include "EVENT/LCCollection.h"

+#include "EVENT/SimTrackerHit.h"

 #include "UTIL/BitField64.h"
 #include "lcio.h"
 #include <string>

@@ -20,7 +21,7 @@

    *  See UTIL::BitField64 for a description of the encoding string. 
    * 
    *  @see BitField64

-   *  @version $Id: CellIDDecoder.h,v 1.1 2006/03/10 16:23:15 gaede Exp $

+   *  @version $Id: CellIDDecoder.h,v 1.2 2006/03/22 11:52:46 gaede Exp $

    */
   template <class T> 
   class CellIDDecoder {

@@ -93,6 +94,26 @@

     static std::string*  _defaultEncoding ;
   } ; 
   

+  
+  /** Provides access to the bit fields, e.g. <br>
+   *   int layer =  myCellIDEncoding( hit )[ "layer" ] ;
+   * Specialization for SimTrackerHits that have only one cellID.
+   */
+  template<>
+  const BitField64 & CellIDDecoder<SimTrackerHit>::operator()( SimTrackerHit* hit ){  
+    
+    if( hit != _oldHit && hit ) {
+      
+      long64 val = long64( hit->getCellID() & 0xffffffff )  ;
+      
+      _b->setValue( val ) ;
+      
+      _oldHit = hit ;
+    }
+    
+    return  *_b ;
+  }
+  

   template <class T>
   std::string* CellIDDecoder<T>::_defaultEncoding 
   = new std::string("byte0:8,byte1:8,byte2:8,byte3:8,byte4:8,byte5:8,byte6:8,byte7:8") ;