TkID

class TkID : public TObject

    public:

                 TkID TkID()
                 TkID TkID(UInt_t tag)
                 TkID TkID(TkID&)
         virtual void ~TkID()
                Int_t barrelEndcap()
              TClass* Class()
      virtual ULong_t Hash()
      virtual TClass* IsA()
       virtual Bool_t IsEqual(TObject* obj)
                Int_t layer()
                Int_t northSouth()
                 void setBarrelEndcap(Int_t barrelEndcapVal)
                 void setLayer(Int_t layerVal)
                 void setNorthSouth(Int_t northSouthVal)
                 void setSystem(Int_t sysVal)
                 void setTag(UInt_t tagVal)
         virtual void ShowMembers(TMemberInspector& insp, char* parent)
         virtual void Streamer(TBuffer& b)
                Int_t system()
               UInt_t tag()

  Data Members
    private:

      UInt_t m_tag  Binary tag  for hit

    public:

      static const Int_t systemOn         
      static const Int_t systemOff        
      static const Int_t layerOn          
      static const Int_t layerOff         
      static const Int_t barrelEndcapOn   
      static const Int_t barrelEndcapOff  
      static const Int_t northSouthOn     
      static const Int_t northSouthOff    

Class Description

 TkID

 The TkID class contains a binary ID number and functions to obtain
 the location of the hit in question.  The TkID class is used in the
 Tracker_Hit and VXD_Hit classes.


/_________________________________________________________________________

Default constructor

 The constructor which sets the tag value.

 Destructor

 Returns the tag value

 Sets the tag value to tagVal

 This returns the layer number from the first 8 bits of m_tag

 setLayer sets the first 8 bits of m_tag to the layer number

 north/south in bit 30. northSouth extracts that, returns
 it shifted down to least-significant end.

 setNorthSouth sets tag N/S bit (bit 30) to requested value.

 barrelEndcap in bit 31. BarrelEndcap extracts that bit
 and shifts to least-significant end.

 setBarrelEndcap sets  barrelEndcap bit (bit 31) to requested
 value

 System in bits 28-29. system extracts those bits and shifts
 down to least-significant end

 setSystem sets tag system bits in appropriate place (bits 28-29)

Inline Functions

            ULong_t Hash()
             Bool_t IsEqual(TObject* obj)
            TClass* Class()
            TClass* IsA()
               void ShowMembers(TMemberInspector& insp, char* parent)
               void Streamer(TBuffer& b)
               TkID TkID(TkID&)