Utilities/interface/Minus.h

0001 #ifndef PhysicsTools_Utilities_Minus_h
0002 #define PhysicsTools_Utilities_Minus_h
0003
0004 namespace funct {
0005
0006   template <typename A>
0007   struct MinusStruct {
0008     MinusStruct() : _() {}
0009     MinusStruct(const A& a) : _(a) {}
0010     operator double() const { return -_(); }
0011     double operator()() const { return -_(); }
0012     double operator()(double x) const { return -_(x); }
0013     double operator()(double x, double y) const { return -_(x, y); }
0014     A _;
0015   };
0016
0017   template <typename A>
0018   struct Minus {
0019     typedef MinusStruct<A> type;
0020     static type operate(const A& a) { return type(a); }
0021   };
0022
0023   template <typename A>
0024   inline typename Minus<A>::type operator-(const A& a) {
0025     return Minus<A>::operate(a);
0026   }
0027 }  // namespace funct
0028
0029 #endif