MultiTrackVertexLinkKinematicConstraint.h

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#ifndef MultiTrackVertexLinkKinematicConstraint_H
#define MultiTrackVertexLinkKinematicConstraint_H

#include "RecoVertex/KinematicFitPrimitives/interface/MultiTrackKinematicConstraint.h"
#include "RecoVertex/KinematicFitPrimitives/interface/KinematicState.h"
#include "DataFormats/CLHEP/interface/AlgebraicObjects.h"

//mother constructed from daughters. including propagation in field.

class MultiTrackVertexLinkKinematicConstraint : public MultiTrackKinematicConstraint {
public:
  MultiTrackVertexLinkKinematicConstraint(GlobalPoint& ref) : refPoint(ref) {}

  AlgebraicVector value(const std::vector<KinematicState>& states, const GlobalPoint& point) const override;

  AlgebraicMatrix parametersDerivative(const std::vector<KinematicState>& states,
                                       const GlobalPoint& point) const override;

  AlgebraicMatrix positionDerivative(const std::vector<KinematicState>& states,
                                     const GlobalPoint& point) const override;

  int numberOfEquations() const override;

  MultiTrackVertexLinkKinematicConstraint* clone() const override {
    return new MultiTrackVertexLinkKinematicConstraint(*this);
  }

private:
  GlobalPoint refPoint;
};
#endif