Sum.h

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#ifndef PhysicsTools_Utilities_Sum_h
#define PhysicsTools_Utilities_Sum_h
#include "PhysicsTools/Utilities/interface/Numerical.h"
#include <boost/static_assert.hpp>

namespace funct {
  template<typename A, typename B>
  struct SumStruct { 
    SumStruct(const A & a, const B & b) : _1(a), _2(b) { }
    double operator()() const {
      return _1() + _2();
    }
    operator double() const {
      return _1() + _2();
    }
    double operator()(double x) const {
      return _1(x) + _2(x);
    }
    double operator()(double x, double y) const {
      return _1(x, y) + _2(x, y);
    }
    A _1; 
    B _2;
  };

  template<typename A, typename B>
  struct Sum {
    typedef SumStruct<A, B> type;
    static type combine(const A& a, const B& b) { return type(a, b); } 
  }; 

  template<typename A, typename B>
  inline typename Sum<A, B>::type operator+(const A& a, const B& b) {
    return Sum<A, B>::combine(a, b);
  }

}

#endif