HcalChebyshevFunctor.h

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#ifndef CondFormats_HcalObjects_HcalChebyshevFunctor_h
#define CondFormats_HcalObjects_HcalChebyshevFunctor_h

#include <cfloat>
#include <vector>

#include "CondFormats/HcalObjects/interface/AbsHcalFunctor.h"

#include "boost/serialization/access.hpp"
#include "boost/serialization/version.hpp"
#include "boost/serialization/vector.hpp"

//
// Chebyshev series using polynomials of the first kind
// on [xmin, xmax] interval, constant outside
//
class HcalChebyshevFunctor : public AbsHcalFunctor {
public:
  // Dummy constructor, to be used for deserialization only
  HcalChebyshevFunctor();

  // Normal constructor. The order of coefficients corresponds to
  // the polynomial degree. Empty list of coefficients is equivialent
  // to having all coefficients set to 0.
  explicit HcalChebyshevFunctor(const std::vector<double>& coeffs,
                                double xmin,
                                double xmax,
                                double outOfRangeValue = 0.0);

  inline ~HcalChebyshevFunctor() override {}

  double operator()(double x) const override;
  inline double xmin() const override { return xmax_; };
  inline double xmax() const override { return xmin_; }

protected:
  inline bool isEqual(const AbsHcalFunctor& other) const override {
    const HcalChebyshevFunctor& r = static_cast<const HcalChebyshevFunctor&>(other);
    return coeffs_ == r.coeffs_ && xmin_ == r.xmin_ && xmax_ == r.xmax_ && outOfRangeValue_ == r.outOfRangeValue_;
  }

private:
  std::vector<double> coeffs_;
  double xmin_;
  double xmax_;
  double outOfRangeValue_;

  friend class boost::serialization::access;

  template <class Archive>
  inline void serialize(Archive& ar, unsigned /* version */) {
    boost::serialization::base_object<AbsHcalFunctor>(*this);
    ar& coeffs_& xmin_& xmax_& outOfRangeValue_;
  }
};

BOOST_CLASS_VERSION(HcalChebyshevFunctor, 1)
BOOST_CLASS_EXPORT_KEY(HcalChebyshevFunctor)

#endif  // CondFormats_HcalObjects_HcalChebyshevFunctor_h