CartesianState.h

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#ifndef CartesianState_H
#define CartesianState_H

#include "FWCore/Utilities/interface/Visibility.h"
#include "DataFormats/GeometryVector/interface/Basic3DVector.h"
#include "VectorDoublet.h"

class dso_internal CartesianState {
public:
  typedef double Scalar;
  typedef Basic3DVector<Scalar> Vector3D;
  typedef VectorDoublet<Vector3D, Vector3D> Vector;

  CartesianState() {}
  CartesianState(const Vector& v, Scalar s) : par_(v), charge_(s) {}
  CartesianState(const Vector3D& pos, const Vector3D& mom, Scalar s) : par_(pos, mom), charge_(s) {}

  const Vector3D& position() const { return par_.first(); }
  const Vector3D& momentum() const { return par_.second(); }

  const Vector& parameters() const { return par_; }

  Scalar charge() const { return charge_; }

private:
  Vector par_;
  Scalar charge_;
};

inline CartesianState operator+(const CartesianState& a, const CartesianState& b) {
  return CartesianState(a.parameters() + b.parameters(), a.charge());
}

inline CartesianState operator-(const CartesianState& a, const CartesianState& b) {
  return CartesianState(a.parameters() - b.parameters(), a.charge());
}

inline CartesianState operator*(const CartesianState& v, const CartesianState::Scalar& s) {
  return CartesianState(v.parameters() * s, v.charge());
}
inline CartesianState operator*(const CartesianState::Scalar& s, const CartesianState& v) {
  return CartesianState(v.parameters() * s, v.charge());
}

inline CartesianState operator/(const CartesianState& v, const CartesianState::Scalar& s) {
  return CartesianState(v.parameters() / s, v.charge());
}

#endif