From: Timothy Hunter <TimHunter@...>
Date: 2007-03-12T20:40:57+09:00
Subject: Re: #define alternative for Ruby

Mike wrote:
> Just try to implement:
> set_default(var, val)
> -- if variable "var" is not defined (not existed) then assign value
> "val"
>   

I'd like to point out that you can't do that with #define, since C 
macros are processed before the compiler runs, and whether or not "var" 
is defined is not known until the compiler runs.