C++11 Overloading operators for strongly typed enumerations.

C++11 has support for strongly typed enumerations. To overload for example &, | and > I have provided an example below:

  enum class CollisionType
  : Uint16 { NONE = 0x0000,
      DYNAMIC = 0x0001,
      STATIC = 0x0002,
      KINEMATIC = 0x0004,
      SENSOR = 0x0008,
      BULLET = 0x0010,      
      };

  inline constexpr CollisionType
  operator&(CollisionType l, CollisionType r){
    return static_cast<CollisionType>(static_cast<Uint16>(l) & static_cast<Uint16>(r));
  }

  inline constexpr bool
  operator>(CollisionType l, int n){
    return static_cast<Uint16>(l) > n;
  }

  inline constexpr CollisionType
  operator|(CollisionType l, CollisionType r){
    return static_cast<CollisionType>(static_cast<Uint16>(l) | static_cast<Uint16>(r));
  }