From: Hiroshi Nakamura <nakahiro@...>
Date: 2012-03-18T14:41:34+09:00
Subject: [ruby-core:43387] [ruby-trunk - Feature #2065] An ancestors iterator


Issue #2065 has been updated by Hiroshi Nakamura.

Description updated
Assignee set to Yusuke Endoh


----------------------------------------
Feature #2065: An ancestors iterator
https://bugs.ruby-lang.org/issues/2065#change-24695

Author: Simon Chiang
Status: Feedback
Priority: Low
Assignee: Yusuke Endoh
Category: core
Target version: 2.0.0


=begin
 I have implemented DSLs that add features to a class/module that should be inherited like methods.  In those cases I end up iterating ancestors to find the first time a feature has been added (the same way I imagine methods are determined).
 
 The issue is that SomeClass.ancestors regenerates the ancestors array each time it is called.  Therefore this is relatively slow:
 
   SomeClass.ancestors.each do |ancestor|
     # ...
   end
 
 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.
=end



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