Custom NativeContainer with a pointer to a generic type

I'm trying to write a custom NativeContainer to contain a single element in 2018.2.

Code (CSharp):

1. using Unity.Collections.LowLevel.Unsafe;
2.  
3. [NativeContainer]
4. public unsafe struct NativeElement<T>
5. {
6.     [NativeDisableUnsafePtrRestriction]
7.     T* ptr;
8. }

This does not compile as T is assumed to be a managed type. However, constraining T with the unmanaged constraint does not work as it is a C#7.3 feature. I've seen that 2018.3 is getting Roslyn support, does this include C#7.3? And for the time being, is there a workaround for my issue?

 

Right now, Unity 2018.3 betas are C# 7.2, which offhand I don't think has unmanaged/managed. Looking into the NativeArray<T> and NativeList<T> implemenations, they both have the private underlying pointer as a

void*

and then use

where T : struct

to strongly type access to the internal buffer data.

 

Thanks, guess we'll have to wait for unmanaged to come along before we can stop doing blittable checks

 

I've implemented this now, you can get the NativeElement container here: https://github.com/Tom01098/NativeElement-UnityCollections