MassConstraint.h

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#ifndef __MASSCONSTRAINT_H
#define __MASSCONSTRAINT_H

#include "ParticleConstraint.h"

class ParticleFitObject;

//  Class MassConstraint:

class MassConstraint : public ParticleConstraint {
  public:
  
    MassConstraint (double mass_ = 0.   
                   );
    virtual ~MassConstraint();
    
    virtual double getValue() const;
    
    virtual void getDerivatives(int idim,      
                                double der[]   
                               ) const;
    
    virtual double getMass (int flag = 1       
                           );
    
    virtual void setMass (double mass_           
                         );
    
    virtual int getVarBasis() const;
  
  protected:

    double mass;   
  
    virtual bool secondDerivatives (int i,                        
                                    int j,                        
                                    double *derivatives           
                                   ) const;

    virtual bool firstDerivatives (int i,                        
                                   double *derivatives           
                                  ) const;

    enum { VAR_BASIS=0 }; // this means that the constraint knows about E,px,py,pz

};

#endif // __MASSCONSTRAINT_H