From: Mike Fletcher <lemurific+rforum@...>
Date: 2006-04-14T03:19:56+09:00
Subject: Re: Question mark in attr_*

Justin Collins wrote:
[...]
> This could be pretty handy...but I don't understand why you have the
> double negation?
>>    define_method("#{sym}?") { !!instance_variable_get("@#{sym}") }


Maybe so the first ! coerces to a true or false, and the second flips it 
back to the proper value (so you can set it with whatever value, but the 
accessor will always return true or false).



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