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Is it possible to check the length of an enum?

Suppose I have some arbitrary enum, and I'm trying to generate a random value from it. It's trivial to accomplish this with a static cast and a hardcoded random int:

  namespace EColor 
      enum Type
      EColor::Type myColor = static_cast<EColor::Type>( FMath::RandRange(0,2) );

However, this requires me to keep excruciating track of every place I use this logic in, and manually change the range I feed FMath whenever I modify the enum. Is there any way I can manually check the exact number of possible values an enum has, instead of hard-coding it every time?

Product Version: UE 4.10
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asked Nov 28 '15 at 12:11 PM in C++ Programming

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2 answers: sort voted first

Why not create a static function as such:

 const int32 Color_Count = 3;
 static EColor::Type GetRandColor()
     return static_cast<EColor::Type>(FMath::RandRange(0, Color_Count - 1));

And that's all you have to call when you need a random EColor::Type. When ever you add/remove values to/from namespace EColor, then you only need to update Color_Count.

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answered Nov 30 '15 at 08:43 PM

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Not that I know of. There is another way to do that though, kinda hacky but works


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answered Nov 28 '15 at 12:30 PM

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avatar image HInoue Nov 28 '15 at 12:41 PM

I'm kind of surprised by this- I know UE1-3 had something called EnumCount, but intellisense doesn't recognize this in 4 and I can't find a reference to it in the API.

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