ModuleInfo, Object.localClasses(), and Object.find() - any users?

[Adam D Ruppe]

On Monday, 12 December 2022 at 21:49:41 UTC, cc wrote:
> It would be nice to be able to preemptively scan/register 
> classes in arbitrary modules without needing to list them in a 
> second area of code.

What I like to do is have classes register themselves. You can do 
a `mixin RegisterThis;` thing that you import from the lib. The 
downside is if you forget to register a child, it won't remind 
you until you try to use it. But the upside is you can do all 
kinds of custom work in there, it avoids scanning modules, and 
can be done without a central list.

The RegisterThis thing adds a static constructor that appends the 
factory to the runtime list.

Would be nice if druntime offered some thing like this to replace 
the existing Object.factory - you can migrate by like `mixin 
imported!"core.factory".Register;` to make it possible. Then an 
extra would-be-even-nicer is if there was some way so all objects 
that inherit from a parent or implement a particular interface 
either 1) reminded you to register it or 2) just self-registered 
automatically. (You can kinda do this with the 
curiously-recurring template pattern but still subclasses can 
fall through the cracks.)