From: Nikolai Weibull <now@...>
Date: 2012-03-23T21:35:29+09:00
Subject: Re: What’s the best way to check if a feature/class has been loaded?

On Thu, Mar 22, 2012 at 10:09, Xavier Noria <fxn@hashref.com> wrote:
> OK, I think I know what you are looking for:
>
> Given a name "C::String" you want to know if there exists a constant C, and inside that one you want to check for a constant String. In the latter check, only the constants in C have to be checked, nor ancestors neither Object.
>
> In addition to that you want const_missing to be triggered as needed (and that does not hold for qualified_const_defined? in particular).
>
> Is that right?

I suppose so.  I have, however, reworked my code and am instead using
the $LOADED_FEATURES check.  It works for what I need and since
there’s really no way to solve it with constants in a uniform and
simple way, that’ll do.

> Is there anything else to add related to required paths?

The point was that it needn’t necessarily be a check for constants
being defined.

I don’t really think we can get any further in this thread.  Thank you
for your input and I hope that this has been an educational thread on
dealing with constants in Ruby to more subscribers than me.