PhysicsTools/Utilities/interface/NthDerivative.h - master - githubmirror/cmssw

PhysicsTools/Utilities/interface/NthDerivative.h

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31 май 2019, 17:22

31 май 2019, 17:2288e58de

#ifndef PhysicsTools_Utilities_NthDerivative_h
#define PhysicsTools_Utilities_NthDerivative_h

#include "PhysicsTools/Utilities/interface/Derivative.h"

namespace funct {

  template <unsigned n, typename X, typename F>
  struct NthDerivative {
    typedef typename Derivative<X, typename NthDerivative<n - 1, X, F>::type>::type type;
    inline static type get(const F& f) { return derivative<X>(NthDerivative<n - 1, X, F>::get(f)); }
  };

  template <typename X, typename F>
  struct NthDerivative<1, X, F> : public Derivative<X, F> {};

  template <typename X, typename F>
  struct NthDerivative<0, X, F> {
    typedef F type;
    inline static type get(const F& f) { return f; }
  };

  template <unsigned n, typename X, typename F>
  typename NthDerivative<n, X, F>::type nth_derivative(const F& f) {
    return NthDerivative<n, X, F>::get(f);
  }

}  // namespace funct

#endif