CoordinateSelector.h

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#ifndef NPSTAT_COORDINATESELECTOR_HH_
#define NPSTAT_COORDINATESELECTOR_HH_

#include <climits>
#include "JetMETCorrections/InterpolationTables/interface/NpstatException.h"

#include "JetMETCorrections/InterpolationTables/interface/AbsMultivariateFunctor.h"

namespace npstat {
  class CoordinateSelector : public AbsMultivariateFunctor {
  public:
    inline explicit CoordinateSelector(const unsigned i) : index_(i) {}

    CoordinateSelector() = delete;

    inline ~CoordinateSelector() override {}

    inline double operator()(const double* point, const unsigned dim) const override {
      if (dim <= index_)
        throw npstat::NpstatInvalidArgument(
            "In npstat::CoordinateSelector::operator(): "
            "input array dimensionality is too small");
      return point[index_];
    }
    inline unsigned minDim() const override { return index_ + 1U; }
    inline unsigned maxDim() const override { return UINT_MAX; }

  private:
    unsigned index_;
  };
}  // namespace npstat

#endif  // NPSTAT_COORDINATESELECTOR_HH_