From: Christophe Grandsire <christophe.grandsire@...>
Date: 2005-10-14T04:37:56+09:00
Subject: Re: instance from class name?

En r�ponse � ES :
> 
> That works; however, if your class name looks like SomeModule::SomeClass,
> you will need to be a bit fancier because const_get only looks for 
> constants
> in the current class or module (the top-level Object instance is the 
> default):
> 
>   class_name.split('::').inject(Object) {|parent, obj| parent.const_get 
> obj}.new
> 

Oh... my...!!! I thought I understood how inject works, but never would 
I have guessed that it was capable of such nifty things!!! This is... wow!

> #split creates an array ['SomeModule', 'SomeClass'], which we iterate over
> using #inject. In the #inject block, the parent will always be the parent
> class or module in which we look for the constant and obj is the next class
> or module name. The Object is passed in as the initial parent object. the
> parent.const_get obj sequence then looks like
> 
>   Object.const_get 'SomeModule' => => SomeModule.const_get 'SomeClass'
> 

When you explain it like that it makes perfect sense. But still... wow!!!
-- 
Christophe Grandsire (who's falling in love with Ruby again :) ).

http://rainbow.conlang.free.fr

You need a straight mind to invent a twisted conlang.