LayerCrossingSide.h

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#ifndef TkDetLayers_LayerCrossingSide_h
#define TkDetLayers_LayerCrossingSide_h

// temporary solution
#include "TrackingTools/GeomPropagators/interface/Propagator.h"

#pragma GCC visibility push(hidden)
class LayerCrossingSide {
public:

  static int barrelSide(const TrajectoryStateOnSurface& startingState, const Propagator& prop) {
    auto pos = startingState.globalPosition();
    auto dir = startingState.globalMomentum();
    bool outwards = (pos.x()*dir.x() + pos.y()*dir.y()) > 0;

    auto inout = outwards ? alongMomentum :  oppositeToMomentum;

    return (prop.propagationDirection() == inout ? 0 : 1);
    
  }

  static int endcapSide(const TrajectoryStateOnSurface& startingState, const Propagator& prop) {
    auto zpos = startingState.globalPosition().z();
    bool outwards = (startingState.globalMomentum().z() * zpos) > 0; 

    auto inout = outwards ? alongMomentum :  oppositeToMomentum;

    return (prop.propagationDirection() == inout ? 0 : 1);

  }

};

#pragma GCC visibility pop
#endif