EvtId.hh

Go to the documentation of this file.

//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of the EvtGen package developed jointly
//      for the BaBar and CLEO collaborations.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
//      Copyright (C) 1998      Caltech, UCSB
//
// Module: EvtGen/EvtId.hh
//
// Description:Class for particle Id used in EvtGen.
//
// Modification history:
//
//    DJL/RYD     May 26, 1998         Module created
//
//------------------------------------------------------------------------
 
#ifndef EVTID_HH
#define EVTID_HH
 
#include <iostream>
// class ostream;
 
class EvtId {
 
public:
  // need a default constructor
  EvtId() : _id( -1 ), _alias( -1 ) {}
 
  EvtId( int id, int alias ) : _id( id ), _alias( alias ) {}
 
  friend std::ostream& operator<<( std::ostream& s, const EvtId& v );
 
  int operator==( const EvtId& id ) const { return _id == id._id; }
  int operator!=( const EvtId& id ) const { return _id != id._id; }
 
  int getId() const { return _id; }
 
  int getAlias() const { return _alias; }
 
  int isAlias() const { return _id != _alias; }
 
private:
  // particle number 0..n. The order of particles are determined
  // by the order in pdt.table
  int _id;
  // if the particle is an alias to another particle alias!=id
  // The only place where the alias should be used is for looking
  // up decays in the decay table.
  int _alias;
};
 
#endif