Job with interface constrained with generic to struct.

Unity Engine
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1

I wanted to use interface in my job, I know that only unmanaged types are allowed in jobs so I have tried something like this:

[BurstCompile]
public struct JobWithInterfaces<TGenericA,TGenericB>:IJobParallelFor
    where TGenericA:struct,IMyInterface
    where TGenericB:struct,IMyInterface
{
    [ReadOnly] public TGenericA A;
    public TGenericA A;
    public void Execute(int index)
    {
        //...
    }
}

But burst is complaining that A is a managed type of IMyInterface. Constraining it to struct is not taken into account. Is it possible to do something like that or I just have to get unmanaged elements from the interface manually and assigned them to fields of the job?

2

You’ll need to get more specific about the error and code, because this kind of thing is possible.

This is the pattern I use: Latios-Framework/PsyshockPhysics/Physics/Internal/Queries/FindPairsInternal.cs at v0.3.1 · Dreaming381/Latios-Framework · GitHub

3

Oddly I have done it again because I have changed my approach thinking that it is not possible and now I do not get this error. But I do get an error that I am writing to [ReadOnly] native array

InvalidOperationException: The Unity.Collections.NativeArray`1[System.Single] has been declared as [ReadOnly] in the job, but you are writing to it.

I get this native array using Property of en interface:

public struct AddMapAToMapBJobGeneric<T> : IJobParallelForBatch where T:struct, IMapIterface
    {
        public T MapA;

        public T MapB;

        public void Execute(int startIndex, int count)
        {
            var mapB = MapB.Data;
            for (int j = startIndex, end = startIndex + count; j < end; j++)
            {
                var d = MapA.Data[j];
                mapB[j] += d; // Exception is thrown here
            }
        }
    }

I have a new approach to my code so I do not need a Generic job, but it would be nice to know if what I am doing is OK for the future :slight_smile:

4

Without seeing the implementation for the concrete IMapInterface, I cannot help you.

5 
 public struct TestMap : IMapInterface
    {
        public int Width { get; }
        public NativeArray<float> Data { get; }

        public TestMap(int width, Allocator allocator = Allocator.TempJob)
        {
            Width = width;
            Data = new NativeArray<float>(width*width, allocator);
        }

        public void Dispose()
        {
            Data.Dispose();
        }
    }

Here is my test implemetation

6

I don’t see any [ReadOnly] attribute anywhere in your code, so I am not sure what the error is referring to.