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