Class FourPiTy

third-party/embreeSrc/common/math/constants.h:157–161

  const constexpr OneOverTwoPiTy one_over_two_pi = OneOverTwoPiTy();

  struct FourPiTy
  {
    __forceinline operator double( ) const { return double(4.0*M_PI); } 
    __forceinline operator float ( ) const { return float(4.0*M_PI); }
  };

  const constexpr FourPiTy four_pi = FourPiTy();