Utilities/interface/Difference.h

0001 #ifndef PhysicsTools_Utilities_Difference_h
0002 #define PhysicsTools_Utilities_Difference_h
0003 #include "PhysicsTools/Utilities/interface/Sum.h"
0004 #include "PhysicsTools/Utilities/interface/Minus.h"
0005
0006 namespace funct {
0007
0008   template <typename A, typename B>
0009   struct Difference {
0010     typedef typename Sum<A, typename Minus<B>::type>::type type;
0011     inline static type combine(const A& a, const B& b) { return a + (-b); }
0012   };
0013
0014   template <typename A, typename B>
0015   inline typename Difference<A, B>::type operator-(const A& a, const B& b) {
0016     return Difference<A, B>::combine(a, b);
0017   }
0018
0019 }  // namespace funct
0020
0021 #endif