From: sur max <sur.max@...>
Date: 2007-03-15T04:05:54+09:00
Subject: Re: Where is my Class ?

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Hi Pit,
Thanks a lot for explaining.

On 3/14/07, Pit Capitain <pit@capitain.de> wrote:
>
> sur max schrieb:
> > (...)
> > B=a  # warning: already initialized constant B
> > (...)
> > this means that the Class B is overwritten by the Class referenced by
> "a"
> > so it is the case of changing a constant. Is that possible ?
>
> No, no objects are overwritten in Ruby. An assignment like
>
>    var = obj
>
> just makes the object on the right (obj) accessible via the name on the
> left (var). The line
>
>    B = a
>
> makes the object referenced by a (the anonymous class) accessible via
> the name B. After this, a and B are different names for the same object.
> The previous object referenced by the name B is still around (until the
> garbage collector reclaims it) and not changed at all.
>
> In Ruby, constants, instance, and local variables are only names for
> objects. Constants have the additional property that they are intended
> to be assigned to only once. If you re-assign a constant, you get a
> warning, but the assignment happens nonetheless. Try this with something
> different than anonymous classes and it might be easier to understand.
>
> There have been many discussions about variable names and objects on
> this mailing list. You can also look at
>
>    http://onestepback.org/index.cgi/Tech/Ruby/Shoeboxes.rdoc
>
> Regards,
> Pit
>
>


-- 
sur
"is a String object" is a String object
http://expressica.com

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