AliDecayer realisation for the EvtGen code and EvtGen itself.

[u/mrichter/AliRoot.git] / TEvtGen / EvtGenBase / EvtId.hh

diff --git a/TEvtGen/EvtGenBase/EvtId.hh b/TEvtGen/EvtGenBase/EvtId.hh
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+++ b/TEvtGen/EvtGenBase/EvtId.hh
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+//--------------------------------------------------------------------------
+//
+// 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 isConjugate(const EvtId & id) const;
+
+  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
+