/data/refman/pasoursint/CMSSW_6_1_1/src/RecoVertex/KinematicFit/interface/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)
        {}
        
        virtual AlgebraicVector value(const std::vector<KinematicState> states, const GlobalPoint& point) const;
        
        virtual AlgebraicMatrix parametersDerivative(const std::vector<KinematicState> states, const GlobalPoint& point) const;
        
        virtual AlgebraicMatrix positionDerivative(const std::vector<KinematicState> states, const GlobalPoint& point) const;
        
        virtual int numberOfEquations() const;
        
        virtual MultiTrackVertexLinkKinematicConstraint * clone()const
        {
                return new MultiTrackVertexLinkKinematicConstraint(*this);
        }
        
private:
        GlobalPoint refPoint;
        
};
#endif