[ruby-core:99798] [Ruby master Feature#14394] Class.descendants

Issue #14394 has been updated by Eregon (Benoit Daloze).


Hanmac (Hans Mackowiak) wrote in #note-10:
> if it would add them, how about adding a parameter to this function exclude/include them? (exclude them as default?)

I think the user can filter easily based on whatever condition they want, so this method shouldn't bother with that.

This will force all Ruby implementations to keep a weak list of subclasses, which is some memory footprint overhead.
TruffleRuby for instance currently does not track subclasses.

But I'm not against it, and it seems easier to use than tracking with `inherited`, and so much cleaner than `ObjectSpace.each_object`.
Seeing the usage in Rails I have often thought we might define such a method in TruffleRuby, because iterating the heap just for this is very inefficient.
So +1 from me.

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Feature #14394: Class.descendants
https://bugs.ruby-lang.org/issues/14394#change-87316

* Author: ridiculous (Ryan Buckley)
* Status: Open
* Priority: Normal
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There have been numerous implementations of the method Class.descendants by various gems. However, I can't help but think that this ability should be included in the Ruby language itself. Especially since Ruby already offers the counterpart method Class.ancestors.

Would it possible to add a `descendants` class method?



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