#ifndef INC_TPHYSOBJ
#define INC_TPHYSOBJ
//////////////////////////////////////////////////////////////////////
//  File: TPhysObj.hpp
//
//  Purpose: define a general interface for D0 root tree physics objects
//
//  Created: 20-MAY-2002  Serban Protopopescu
//
//////////////////////////////////////////////////////////////////////  

#ifndef ROOT_TObject
#include "TObject.h"
#endif

#ifndef ROOT_TLorentzVector
#include "TLorentzVector.h"
#endif

#include "kinem_util/AnglesUtil.hpp"

class TPhysObj: public TObject
{
public:


  // constructors
  TPhysObj() {}
  virtual ~TPhysObj() {}

  //   Interface methods

  virtual Float_t px()    const = 0;
  virtual Float_t py()    const = 0;
  virtual Float_t pz()    const = 0;
  virtual Float_t E()     const = 0;
  virtual Float_t pT()    const; 
  virtual Float_t phi()   const;
  virtual Float_t eta()   const;
  virtual Float_t theta() const;
  virtual Float_t p()     const;
  virtual Float_t charge() const = 0;

  virtual TLorentzVector lorentz_vector() const;

  virtual bool operator<(const TPhysObj& x) const
  {
    return pT() < x.pT();
  }

  virtual bool operator==(const TPhysObj& x) const
  {
    return this == &x;
  }
   ClassDef(TPhysObj, 1)   
};

#endif // INC_TPHYSOBJ