From: Chris Thiel <ccthiel@...>
Date: 2007-07-26T04:30:05+09:00
Subject: Re: Question - Passing parameters by reference

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On 7/25/07, Lionel Bouton <lionel-subscription@bouton.name> wrote:
>
> Chris Thiel wrote the following on 25.07.2007 20:56 :
> > I believe it's adding & in front of the argument in a method in C++ to
> > get
> > pass by reference.
> > void add_one(&num) {
> > num++
> > }
> >
> > Is there something that's equivalent in ruby?
>
> Ruby always pass references. The problem is that "number += 1" is
> expanded as "number = number + 1".
>
> The problem here is that Fixnum#+ doesn't modify the object but
> generates another one. So  in fact it generates what happens is that a
> new Object is created and then is referenced by number, but not by n. To
> make it work like you want you would need to only use methods that
> modify the object itself, which AFAIR don't exist in this context.
>
> Lionel.
>
> Yup, that's what I was wondering.
Sorry to derail the thread a bit there.

Chris

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