ParametricTrait.h

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#ifndef PhysicsTools_Utilities_ParametricTrait_h
#define PhysicsTools_Utilities_ParametricTrait_h

#include "PhysicsTools/Utilities/interface/Functions.h"
#include "PhysicsTools/Utilities/interface/Fraction.h"
#include "PhysicsTools/Utilities/interface/Operations.h"

namespace funct {

  template <typename F>
  struct Parametric {
    static const int value = 1;
  };

  template <int n>
  struct Parametric<Numerical<n> > {
    static const int value = 0;
  };

  template <int n, int m>
  struct Parametric<FractionStruct<n, m> > {
    static const int value = 0;
  };

#define NON_PARAMETRIC(FUN)     \
  template <>                   \
  struct Parametric<FUN> {      \
    static const int value = 0; \
  }

#define NON_PARAMETRIC_UNARY(FUN)                  \
  template <typename A>                            \
  struct Parametric<FUN<A> > {                     \
    static const int value = Parametric<A>::value; \
  }

  NON_PARAMETRIC_UNARY(AbsStruct);
  NON_PARAMETRIC_UNARY(SgnStruct);
  NON_PARAMETRIC_UNARY(ExpStruct);
  NON_PARAMETRIC_UNARY(LogStruct);
  NON_PARAMETRIC_UNARY(SinStruct);
  NON_PARAMETRIC_UNARY(CosStruct);
  NON_PARAMETRIC_UNARY(TanStruct);
  NON_PARAMETRIC_UNARY(MinusStruct);

#define NON_PARAMETRIC_BINARY(FUN)                                         \
  template <typename A, typename B>                                        \
  struct Parametric<FUN<A, B> > {                                          \
    static const int value = Parametric<A>::value || Parametric<A>::value; \
  }

  NON_PARAMETRIC_BINARY(SumStruct);
  NON_PARAMETRIC_BINARY(ProductStruct);
  NON_PARAMETRIC_BINARY(RatioStruct);
  NON_PARAMETRIC_BINARY(PowerStruct);

#undef NON_PARAMETRIC_UNARY
#undef NON_PARAMETRIC_BINARY

}  // namespace funct

#endif