Variables.h

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#ifndef PhysicsTools_Utilities_Variables_h
#define PhysicsTools_Utilities_Variables_h
#include "PhysicsTools/Utilities/interface/ParametricTrait.h"
#include <iostream>

#define DEFINE_VARIABLE_T(T, X, NAME)                                                                         \
  namespace funct {                                                                                           \
    struct X {                                                                                                \
      typedef T type;                                                                                         \
      X() {}                                                                                                  \
      X(const T& x) { set(x); }                                                                               \
      inline operator T() const { return value; }                                                             \
      inline T operator()() const { return value; }                                                           \
      inline static const char* name() {                                                                      \
        static const char* name = NAME;                                                                       \
        return name;                                                                                          \
      }                                                                                                       \
      inline X operator=(const T& x) {                                                                        \
        set(x);                                                                                               \
        return *this;                                                                                         \
      }                                                                                                       \
      inline static void set(const T& x) { value = x; }                                                       \
                                                                                                              \
    private:                                                                                                  \
      static T value;                                                                                         \
    };                                                                                                        \
                                                                                                              \
    NON_PARAMETRIC(X);                                                                                        \
                                                                                                              \
    inline std::ostream& operator<<(std::ostream& cout, const funct::X&) { return cout << funct::X::name(); } \
  }                                                                                                           \
                                                                                                              \
  struct __useless_ignoreme

#define IMPLEMENT_VARIABLE_T(T, X) \
  namespace funct {                \
    T X::value;                    \
  }                                \
                                   \
  struct __useless_ignoreme

#define DEFINE_VARIABLE(X, NAME) DEFINE_VARIABLE_T(double, X, NAME)

#define IMPLEMENT_VARIABLE(X) IMPLEMENT_VARIABLE_T(double, X)

#define DEFINE_INT_VARIABLE(X, NAME) DEFINE_VARIABLE_T(int, X, NAME)

#define IMPLEMENT_INT_VARIABLE(X) IMPLEMENT_VARIABLE_T(int, X)

DEFINE_VARIABLE(DefaultVariable, "_");
DEFINE_VARIABLE(X, "x");
DEFINE_VARIABLE(Y, "y");
DEFINE_VARIABLE(Z, "z");

#endif