BackToBackKinematicConstraint.h

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#ifndef BackToBackKinematicConstraint_H
#define BackToBackKinematicConstraint_H

#include "RecoVertex/KinematicFitPrimitives/interface/KinematicConstraint.h"

class BackToBackKinematicConstraint : public KinematicConstraint {
public:
  BackToBackKinematicConstraint() {}

  ~BackToBackKinematicConstraint() override {}

  std::pair<AlgebraicVector, AlgebraicVector> value(const AlgebraicVector& exPoint) const override;

  std::pair<AlgebraicMatrix, AlgebraicVector> derivative(const AlgebraicVector& exPoint) const override;

  std::pair<AlgebraicVector, AlgebraicVector> value(const std::vector<RefCountedKinematicParticle>& par) const override;

  std::pair<AlgebraicMatrix, AlgebraicVector> derivative(
      const std::vector<RefCountedKinematicParticle>& par) const override;

  AlgebraicVector deviations(int nStates) const override;

  int numberOfEquations() const override;

  KinematicConstraint* clone() const override;

private:
};
#endif