TTVertexConstraint.h

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#ifndef __TTVERTEXCONSTRAINT_H
#define __TTVERTEXCONSTRAINT_H

#include<vector>
#include<cassert>
#include "BaseConstraint.h"
#include "ThreeVector.h"

//  Class TTVertexConstraint:

class TrackFitObject;

class TTVertexConstraint: public BaseConstraint {
  public:
    TTVertexConstraint (const TrackFitObject& t0, 
                      int i0,
                      const TrackFitObject& t1,
                      int i1,
                      int axis
                     );
    virtual ~TTVertexConstraint();
    
    virtual double getValue() const;
    
    virtual void getDerivatives(int idim, double der[]) const;
    virtual void add1stDerivativesToMatrix(int idim, double *M) const;
    virtual void add2ndDerivativesToMatrix(int idim, double *M, double lambda) const;
    
    virtual int  getGlobalNum() const {return globalNum;}
    virtual void setGlobalNum(int iglobal) {globalNum = iglobal;}
    
  protected:
  
    virtual void invalidateCache() const;
    virtual void updateCache() const;
      
    int globalNum;
    
    const TrackFitObject *tracks[2]; 
    int   vnumber[2];
    ThreeVector factor;    
    double sign[2];
    
    mutable bool cachevalid;

};

#endif /* #ifndef  __TTVERTEXCONSTRAINT_H */

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