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<title>extended (SubclassTracking)</title>
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<pre><span class="ruby-comment cmt"># File lib/SubclassTracking.rb, line 3</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">extended</span>(<span class="ruby-identifier">klazz</span>)
(<span class="ruby-keyword kw">class</span> <span class="ruby-operator"><<</span><span class="ruby-identifier">klazz</span>; <span class="ruby-keyword kw">self</span>; <span class="ruby-keyword kw">end</span>).<span class="ruby-identifier">send</span> <span class="ruby-identifier">:attr_accessor</span>, <span class="ruby-identifier">:subclasses</span>
(<span class="ruby-keyword kw">class</span> <span class="ruby-operator"><<</span><span class="ruby-identifier">klazz</span>; <span class="ruby-keyword kw">self</span>; <span class="ruby-keyword kw">end</span>).<span class="ruby-identifier">send</span> <span class="ruby-identifier">:define_method</span>, <span class="ruby-identifier">:inherited</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">clzz</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">klazz</span>.<span class="ruby-identifier">subclasses</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">clzz</span>
<span class="ruby-keyword kw">super</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-identifier">klazz</span>.<span class="ruby-identifier">subclasses</span> = []
<span class="ruby-keyword kw">end</span></pre>
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