[ruby-core:28761] [Feature #2065](Feedback) An ancestors iterator

Issue #2065 has been updated by Yusuke Endoh.

Status changed from Open to Feedback

Hi,

> It would be nice if there were a method that iterates ancestors without generating the ancestors array:
>
>   SomeClass.each_ancestor do |ancestor|
>     # ...
>   end
>
> This could improve the performance of DSLs that want to support method-like inheritance.

Show a benchmark.  I bet it is not bottleneck in your application.

It is endless to provide each_* method corresponding to any methods
that returns an array.

I'll close this ticket unless there is no objection.


> As a side note, in my use case I offer caching like you suggest as an option to improve performance.  However it's exactly as you point out... hard to invalidate at the right time.

Cannot Module#included be used?


  class Class
    AncestorsCache = {}
    def ancestors_cached
      AncestorsCache[self] ||= ancestors
    end
  end

  class Module
    def included(x)
      Class::AncestorsCache.clear
    end
  end

  class C; end
  p C.ancestors_cached  #=> [C, Object, Kernel, BasicObject]

  module M; end
  class C; include M; end
  p C.ancestors_cached  #=> [C, M, Object, Kernel, BasicObject]

-- 
Yusuke Endoh <[e-mail]>
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http://redmine.ruby-lang.org/issues/show/2065

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