From: Sean Chittenden <sean@...>
Date: 2002-04-01T08:17:28+09:00
Subject: Re: Detecting class variables....

> > I have a class that will have many objects and each object has a
> > rather expensive regexp that I don't want to recompile every instance.
> > I was hoping to do something similar to:
> >
> > if @@httpd_combined_entry_re.nil?
> >   @@httpd_combined_entry_re = Regexp.new('some regexp string')
> > end
> >
> >
> > Without using Modules#class_variables, there anyway to see if the
> > symbol for a class variable is populated?  -sc
> 
> Could you get by with the ||= assignment idiom?
> 
>   @@class_var ||= Regexp.new('...')

Nope.

:46:in `initialize': uninitialized class variable @@httpd_combined_entry_re in Logs::Httpd::Combined::Entry (NameError)

-sc

-- 
Sean Chittenden