DecomposeProduct.h

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#ifndef PhysicsTools_Utilities_DecomposeProduct_h
#define PhysicsTools_Utilities_DecomposeProduct_h
#include "PhysicsTools/Utilities/interface/Product.h"

namespace funct {

  template <typename A, typename B>
  struct DecomposeProduct {};

  template <typename A>
  struct DecomposeProduct<A, A> {
    inline static const A& get(const A& a) { return a; }
  };

  template <typename A, typename B>
  struct DecomposeProduct<ProductStruct<A, B>, A> {
    inline static const A& get(const ProductStruct<A, B>& _) { return _._1; }
  };

  template <typename A, typename B>
  struct DecomposeProduct<ProductStruct<A, B>, B> {
    inline static const B& get(const ProductStruct<A, B>& _) { return _._2; }
  };

}  // namespace funct

#endif