Bug Can't use NativeHashSet of custom struct

In the following code, I create a NativeHashSet<IntWraper> (IntWrapper being a custom type).

I then pass that NativeHashSet into a job, and attempt to add an element to it.

This causes Burst not to compile the job, with an error:

Burst error BC1001: Unable to access the managed method `object.GetHashCode()` from type `IntWrapper`

This doesn't happen with base types, like int. Only my custom types, like my wrapper struct. What am I doing wrong, here? Thank you for any advice.

Code (CSharp):

1. public struct IntWrapper : IEquatable<IntWrapper>
2. {
3.     public int value;
4.     public bool Equals(IntWrapper other)
5.     {
6.         return value.Equals(other.value);
7.     }
8. }
9. [BurstCompile]
10. public struct IntWrapperJob : IJob
11. {
12.     public NativeHashSet<IntWrapper> intWrapperMap;
13.     public void Execute()
14.     {
15.         intWrapperMap.Add(new IntWrapper());
16.     }
17. }
18. [BurstCompile]
19. public struct IntWrapperSystem : ISystem
20. {
21.     private NativeHashSet<IntWrapper> intWrapperMap;
22.     public void OnCreate(ref SystemState state)
23.     {
24.         intWrapperMap = new NativeHashSet<IntWrapper>(10, Allocator.Persistent);
25.     }
26.     [BurstCompile]
27.     public void OnDestroy(ref SystemState state)
28.     {
29.         intWrapperMap.Dispose();
30.     }
31.     public void OnUpdate(ref SystemState state)
32.     {
33.         state.Dependency = new IntWrapperJob
34.         {
35.             intWrapperMap = intWrapperMap
36.         }
37.         .Schedule(state.Dependency);
38.     }
39. }
40.  

 

Try adding this to FooData

Code (CSharp):

1.         public override int GetHashCode()
2.         {
3.             return foo.GetHashCode();
4.         }

 

Can't believe I didn't see this. Always right after you post!

Thank you.

 

I am sorry for being late, but can you explain what is FooData here?

 

I think it is actually IntWrapper. To use NativeHashMap, your type needs to implement IEquatable AND override GetHashCode().