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	<title>Like Dream of Banister Fiend &#187; metaprogramming</title>
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		<title>Dupping Our Way Out of Instance Eval?</title>
		<link>http://banisterfiend.wordpress.com/2008/12/19/dupping-our-way-out-of-instance-eval/</link>
		<comments>http://banisterfiend.wordpress.com/2008/12/19/dupping-our-way-out-of-instance-eval/#comments</comments>
		<pubDate>Thu, 18 Dec 2008 15:13:53 +0000</pubDate>
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				<category><![CDATA[C]]></category>
		<category><![CDATA[metaprogramming]]></category>
		<category><![CDATA[programming]]></category>
		<category><![CDATA[ruby]]></category>
		<category><![CDATA[dup_eval]]></category>
		<category><![CDATA[iclass]]></category>
		<category><![CDATA[instance_eval]]></category>
		<category><![CDATA[mixico]]></category>
		<category><![CDATA[mix_eval]]></category>
		<category><![CDATA[MRI]]></category>
		<category><![CDATA[ruby C API]]></category>
		<category><![CDATA[ruby dup]]></category>

		<guid isPermaLink="false">http://banisterfiend.wordpress.com/?p=529</guid>
		<description><![CDATA[Although Instance_eval can be a great tool for creating clean DSLs it does, unfortunately, suffer from a few shortcomings. These shortcomings are caused by the &#8216;change in self&#8217;  of the block and may, in some circumstances,  lead to surprising behaviour.
_why detailed a lot of these shortcomings in his blog post and proposed a wonderful solution: [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=banisterfiend.wordpress.com&blog=4484859&post=529&subd=banisterfiend&ref=&feed=1" />]]></description>
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