Numerical.h

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#ifndef PhysicsTools_Utilities_Numerical_h
#define PhysicsTools_Utilities_Numerical_h
#include <cassert>
namespace funct {

  template<int n> struct Numerical {
    Numerical() { }
    Numerical(int m) { assert(m == n); }
    static const int value = n;
    double operator()() const { return n; }
    operator double() const { return n; }
    double operator()(double) const { return n; }
    double operator()(double, double) const { return n; }
  };

  template<int n> const Numerical<n>& num()
  { static Numerical<n> c; return c; }

}

#endif