Minus.h

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#ifndef PhysicsTools_Utilities_Minus_h
#define PhysicsTools_Utilities_Minus_h

namespace funct {

  template <typename A>
  struct MinusStruct {
    MinusStruct() : _() {}
    MinusStruct(const A& a) : _(a) {}
    operator double() const { return -_(); }
    double operator()() const { return -_(); }
    double operator()(double x) const { return -_(x); }
    double operator()(double x, double y) const { return -_(x, y); }
    A _;
  };

  template <typename A>
  struct Minus {
    typedef MinusStruct<A> type;
    static type operate(const A& a) { return type(a); }
  };

  template <typename A>
  inline typename Minus<A>::type operator-(const A& a) {
    return Minus<A>::operate(a);
  }
}  // namespace funct

#endif