UE4_Bitmask_test.cpp

UENUM(BlueprintType, meta = (Bitflags))
enum class EHorizonPlayerSortType : uint8
{
	Invalidated     = 0,
	Level					UMETA(DisplayName = "PlayerLevel"),
	Power					UMETA(DisplayName = "Power"),
	Speed					UMETA(DisplayName = "Speed"),
	PlaceHolder1 			UMETA(DisplayName = "PlaceHolder1"),
	PlaceHolder2			UMETA(DisplayName = "PlaceHolder2"),
	PlaceHolder3			UMETA(DisplayName = "PlaceHolder3"),
	PlaceHolder4			UMETA(DisplayName = "PlaceHolder4"),
};

ENUM_CLASS_FLAGS(EHorizonPlayerSortType)


USTRUCT(BlueprintType)
struct HORIZONTWEEN_API FHorizonPlayerParameters
{
	GENERATED_BODY()
		FHorizonPlayerParameters()
		: PlayerSortTypeFlags((int)EHorizonPlayerSortType::Level)
	{
	}
public:

	UPROPERTY(EditAnywhere, BlueprintReadWrite, meta = (Bitmask, BitmaskEnum = "EHorizonPlayerSortType"))
		int PlayerSortTypeFlags;
};



bool HasFlag(const int32& Flags, EHorizonPlayerSortType TestFlag)
 {
     int32 bitFlag = static_cast<int32>(1 << (int32)TestFlag); //shift to the bit corresponding to the enum value
     return (Flags & bitFlag ) != 0;
 }
 
void Usage(const FHorizonPlayerParameters& param){
 	int32 bitFlag = static_cast<int32>((1 << (INT32)EHorizonPlayerSortType::Level) |
					   (1 << (INT32)EHorizonPlayerSortType::Speed));  // 10
	bool b1 = HasFlag(param.PlayerSortTypeFlags, EHorizonPlayerSortType::Level);  //true
	bool b2 = HasFlag(param.PlayerSortTypeFlags, EHorizonPlayerSortType::Power); //false
	bool b3 = HasFlag(param.PlayerSortTypeFlags, EHorizonPlayerSortType::Speed); //true
}