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TMap Hashable KeyType

Hey,

I am trying to use a TMap with a struct as the key. The struct is a collection of ints. I need to provide a custom key to get it to work.

I have tried to follow the TMap docs and having absolutely no luck getting it to work, so was hoping someone could explain how to do this.

Product Version: UE 4.17
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asked Sep 19 '17 at 01:59 PM in Using UE4

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DanielOrchard
838 17 21 36

avatar image jenniferbrownz Jun 23 '18 at 07:55 AM

I have a translucent sphere that the player can pass into and out of. But when I pass into the sphere, I can't see it anymore from the inside. Is there a way to make a material that would allow me to see the sphere even when I pass into it? kissmanga

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1 answer: sort voted first

It's been a few weeks since I asked this, and I finally figured it out by combing through the vector structs.

For anyone who might also have this problem:

In your struct you need to add a operator override== , and then outside your struct, a GetTypeHash. My mistake was using the GetTypeHash inside my method.

ie

 struct FStructName
 {
     int x;
     int y;
 
      bool operator==(const FStructName& a) const
     {
         return x == a.x && y == a.y;
     }
 }
 // end of struct
 
 FORCEINLINE uint32 GetTypeHash(const FStructName& b)
 {
     return FCrc::MemCrc_DEPRECATED(&b, sizeof(FStructName));
 }
 

There is a non-deprecated version of that Memcrc, but since epic are using it in all theirs, I just went with it.

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answered Sep 30 '17 at 04:50 PM

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DanielOrchard
838 17 21 36

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