Placing TypeCacheTarget attribute on generic type should fill the type cache for all instances of the generic type

[lgarczyn]

[TypeCacheTarget]
public interface IInterface<T> { }

will cause

GetTypesDerivedFrom<IInterface<SomeTag>>()

to return an empty array.

The workaround is to add a parent interface, get its children, and then filter said children by the generic interface instance.

It would be nice if it was possible to get children types of generic type instances as well as generic type definitions.

Additionally, we've faced a couple different bugs caused by either forgetting a TypeCacheTarget attribute or misunderstanding what exactly will be cached by the attribute. If GetTypesDerivedFrom could optionally log a warning that it will fail in builds, it would make this situation a lot easier.

Finally, I'm often left after builds with a dead reference to the type cache asset in project settings, that I have to clear by hand.

[thebeardphantom]

If GetTypesDerivedFrom could optionally log a warning that it will fail in builds, it would make this situation a lot easier.

This would require being able to build and use the SerializedTypeCache in the editor (instead of forwarding to Unity's editor-only TypeCache). This is something I want to do but would definitely be a new major version. I would recommend filing a new issue for this so that this request can be tracked in the medium term until I have time to do this work.

Finally, I'm often left after builds with a dead reference to the type cache asset in project settings, that I have to clear by hand.

This is something I'm having a hard time reproducing at the moment. Could you file a separate issue for this as well and include as much detail as possible to help narrow it down? I'm unsure if there are specific circumstances that lead to this (for example, I think, based on the current implementation, if the build process was interrupted by an editor crash this would likely occur).

[thebeardphantom]

This will be in experimental release 1.2.0-exp.1. Once I've fleshed support for this out enough and added sufficient testing to ensure stability I'll do a full stable 1.2.0 release.

[lgarczyn]

Thank you ! I will try to reproduce it on my end, and might give a try at loading the serializetypedcache in editor

[thebeardphantom]

The version has been changed to 2.0.0-exp.1, available on the main branch. Once 2.x is out of experimental it'll be released as 2.0.0 on a release branch.