From: Pit Capitain <pit@...>
Date: 2007-02-14T23:40:42+09:00
Subject: Re: Initializing dynamic instance methods

Lars Olsson schrieb:
> What's the best way to remedy the error/warning that the following
> code produces?
> 
> class Parent
>     def self.foo()
>         module_eval("def foo(); @foo; end")
>         module_eval("def foo=(newfoo); @foo = newfoo; end")
>     end
> end
> 
> class Child < Parent
>     foo
> end
> 
> c = Child.new
> p c.foo
> 
> (running with ruby -w)
> (eval):1: warning: instance variable @foo not initialized
> nil

I don't know if its the best way, but you could try

   module_eval("def foo(); @foo if defined? @foo; end")

Regards,
Pit