Reconstruction/MdcPatRec/TrkBase/include/TrkBase/TrkVisitor.h

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//--------------------------------------------------------------------------
// File and Version Information:
//
// Description:  TrkVisitor is an implementation of the Visitor pattern
//      for use in calculating various things for different types of
//      trajectories. (See the book _Design Patterns_ or one of the
//      authors for a definition of the Visitor pattern.)  It is the
//      abstract base class for visitors such as MomVisitor (the
//      momentum visitor) and others.
//
// Environment:
//      Software developed for the BaBar Detector at the SLAC B-Factory.
//
// Author(s): Justin Albert, Steve Schaffner
//
//------------------------------------------------------------------------
 
#ifndef TRKVISITOR_H
#define TRKVISITOR_H
 
class HelixTraj;
class TrkCircleTraj;
class NeutTraj;
class TrkDifLineTraj;
 
// Class interface //
class TrkVisitor {
 
public:
  TrkVisitor();
  virtual ~TrkVisitor();
 
  //********************************
  // The visitor functions:
  //********************************
 
  virtual void trkVisitHelixTraj( const HelixTraj* )      = 0;
  virtual void trkVisitCircleTraj( const TrkCircleTraj* ) = 0;
  virtual void trkVisitNeutTraj( const NeutTraj* )        = 0;
  virtual void trkVisitLineTraj( const TrkDifLineTraj* )  = 0;
};
 
#endif