Unreal Engine Issues

UE-82048

Enum with "MAX" element at other than the last element removes user defined last element

Enum with "MAX" element at other than the last element removes user defined last element

UDN
Description

FNativeClassHeaderGenerator::ExportEnum produces this behavior.
If an enum has “MAX” somewhere in the array, it removes last element.

I tested my code to fix the issue.

// code placeholder
bool UEnum::ContainsExistingMax() const
 {
 #if 1 // testcode
     const int32 LastElementIndex = Names.Num()-1;
     if (GetIndexByName(*GenerateFullEnumName(TEXT("MAX")), EGetByNameFlags::CaseSensitive) == LastElementIndex )
     {
         return true;
     }
 
     FName MaxEnumItem = *GenerateFullEnumName(*(GenerateEnumPrefix() + TEXT("_MAX")));
     if (GetIndexByName(MaxEnumItem, EGetByNameFlags::CaseSensitive) == LastElementIndex )
     {
         return true;
     }
 #else
     if (GetIndexByName(*GenerateFullEnumName(TEXT("MAX")), EGetByNameFlags::CaseSensitive) != INDEX_NONE )
     {
         return true;
     }
 
     FName MaxEnumItem = *GenerateFullEnumName(*(GenerateEnumPrefix() + TEXT("_MAX")));
     if (GetIndexByName(MaxEnumItem, EGetByNameFlags::CaseSensitive) != != INDEX_NONE )
     {
         return true;
     }
 #endif
     return false;
 }

The "Get number of entries" returns 4 in above example.

Steps to Reproduce

for example define enum with following code

 UENUM(BlueprintType)
 enum class EMaxTest2 : uint8
 {
     A,
     B,
     MAX,
     C
  };

UHT removes last element "C".
"Get number of entries" node returns 3.

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Won't Fix
ComponentUE - Foundation - Core
CreatedOct 18, 2019
ResolvedAug 27, 2021
UpdatedAug 27, 2021
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