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TEnumAsByte is not intended for use with enum classes?

Is this just a UBT bug? I'm getting

 TEnumAsByte is not intended for use with enum classes - please derive your enum class from uint8 instead.
 note: see declaration of 'TEnumAsByte_EnumClass<true>
 note: see reference to class template instantiation 'TEnumAsByte<EFNCellularReturnType>' being compiled

However, my code is as follows:

 UENUM(BlueprintType)
 enum class EFNCellularReturnType : uint8
 {
     CellValue     UMETA(DisplayName="CellValue"),
     NoiseLookup     UMETA(DisplayName="NoiseLookup"),
     Distance     UMETA(DisplayName="Distance"),
     Distance2     UMETA(DisplayName="Distance2"),
     Distance2Add UMETA(DisplayName="Distance2Add"),
     Distance2Sub UMETA(DisplayName="Distance2Sub"),
     Distance2Mul UMETA(DisplayName="Distance2Mul"),
     Distance2Div UMETA(DisplayName="Distance2Div")
 };

Functions

 UFUNCTION(BlueprintCallable, meta = (DisplayName = "SetCellularReturnType", Keywords = ""), Category = "FastNoise")
     void K2_SetCellularReturnType(TEnumAsByte<EFNCellularReturnType> cellularReturnType) { SetCellularReturnType(cellularReturnType); }
 
     UFUNCTION(BlueprintCallable, meta = (DisplayName = "GetCellularReturnType", Keywords = ""), Category = "FastNoise")
     TEnumAsByte<EFNCellularReturnType> K2_GetCellularReturnType() const { return GetCellularReturnType(); }

I have 4 other enums in the same format.

 UENUM(BlueprintType)
 enum class EFNNoiseType : uint8
 {
     Value           UMETA(DisplayName="Value"),
     ValueFractal   UMETA(DisplayName="ValueFractal"),
     Perlin           UMETA(DisplayName="Perlin"),
     PerlinFractal  UMETA(DisplayName="PerlinFractal"),
     Simplex           UMETA(DisplayName="Simplex"),
     SimplexFractal UMETA(DisplayName="SimplexFractal"),
     Cellular       UMETA(DisplayName="Cellular"),
     WhiteNoise       UMETA(DisplayName="WhiteNoise"),
     Cubic           UMETA(DisplayName="Cubic"),
     CubicFractal   UMETA(DisplayName="CubicFractal")
 };
 
 UENUM(BlueprintType)
 enum class EFNInterp : uint8
 {
     Linear    UMETA(DisplayName="Linear"),
     Hermite    UMETA(DisplayName="Hermite"),
     Quintic    UMETA(DisplayName="Quintic")
 };
 
 UENUM(BlueprintType)
 enum class EFNFractalType : uint8
 {
     FBM           UMETA(DisplayName="FBM"),
     Billow       UMETA(DisplayName="Billow"),
     RigidMulti UMETA(DisplayName="RigidMulti")
 };
 
 UENUM(BlueprintType)
 enum class EFNCellularDistanceFunction : uint8
 {
     Euclidean UMETA(DisplayName="Euclidean"),
     Manhattan UMETA(DisplayName="Manhattan"),
     Natural      UMETA(DisplayName="Natural")
 };

The generated header file seems to be where the warning originates. In the generated header of file that include the header that has the enums, it forward declares the enums as follows

 enum class EFNCellularReturnType : uint8;
 enum class EFNCellularDistanceFunction : uint8;
 enum class EFNFractalType : uint8;
 enum class EFNNoiseType : uint8;
 enum class EFNInterp : uint8;

Here is te generated function calls which are generated in the same way as the rest of the enums

 DECLARE_FUNCTION(execK2_GetCellularReturnType) \
     { \
         P_FINISH; \
         P_NATIVE_BEGIN; \
         *(EFNCellularReturnType*)Z_Param__Result=this->K2_GetCellularReturnType(); \
         P_NATIVE_END; \
     } \
  \
     DECLARE_FUNCTION(execK2_SetCellularReturnType) \
     { \
         P_GET_ENUM(EFNCellularReturnType,Z_Param_cellularReturnType); \
         P_FINISH; \
         P_NATIVE_BEGIN; \
         this->K2_SetCellularReturnType(EFNCellularReturnType(Z_Param_cellularReturnType)); \
         P_NATIVE_END; \
     } \

The project still builds but this warning is driving me mad. If anyone can see something that I can't, please let me know. If this is a bug, please let me know. I've spent far too long trying to rename it, change it's values, rename it's values, made it the first emun, put it in the middle. No matter what I do, it is always this enum mentioned in the warnings. Any help is much appreciated.

Product Version: UE 4.18
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asked Jan 07 '18 at 02:42 PM in C++ Programming

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MJ_01
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2 answers: sort voted first

Hey there, afaik TEnumAsBytes is only intended for typical enums (not class enums). For class enums i believe you can use the type directly without TEnumAsBytes.

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answered Jan 08 '18 at 10:32 AM

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xlar8or
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avatar image MJ_01 Jan 09 '18 at 01:37 AM

You are correct. It is no longer complaining after I removed TEnumAsByte on all my enums. However, the reason I added TEnumAsByte in the first place was because I got an error and it was complaining that I didn't have it in the first place. I also had other errors that I have since resolved since that build attempt.

avatar image xlar8or Jan 09 '18 at 12:42 PM

So everything is working now?

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I'm using 4.20.2 and I was having some problems getting enums working correctly while trying to pass them as a function parameter.

Using the namespace enum technique along with the TEnumAsByte in the function parameter worked for me.

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answered Sep 30 '18 at 03:35 PM

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Lawsonry
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