MagneticFieldProvider.h

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#ifndef MagneticFieldProvider_h
#define MagneticFieldProvider_h

#include "DataFormats/GeometryVector/interface/Point3DBase.h"
#include "DataFormats/GeometryVector/interface/Vector3DBase.h"
#include "DataFormats/GeometryVector/interface/LocalTag.h"
#include "DataFormats/GeometryVector/interface/GlobalTag.h"

template <class T>
class MagneticFieldProvider {
public:
  typedef Point3DBase<T, GlobalTag> GlobalPointType;
  typedef Point3DBase<T, LocalTag> LocalPointType;
  typedef Vector3DBase<T, GlobalTag> GlobalVectorType;
  typedef Vector3DBase<T, LocalTag> LocalVectorType;

  virtual ~MagneticFieldProvider() {}

  virtual LocalVectorType valueInTesla(const LocalPointType& p) const = 0;

  // virtual GlobalVectorType valueInTesla( const GlobalPointType& p) const = 0;

  virtual int hasDerivatives() const { return false; }

  virtual LocalVectorType derivativeInTeslaPerMeter(const LocalPointType& p, int N) const { return LocalVectorType(); }
};

#endif