From: Stefano Crocco <stefano.crocco@...>
Date: 2008-11-18T16:42:00+09:00
Subject: Re: let my custom defined class convert to string?

Alle Tuesday 18 November 2008, Jonathan Rochkind ha scritto:
> Is there any way I can make it so my custom-defined class can be
> automatically converted to a string?
>
> I have a #to_s method in it.
>
> So it works when I do something like "#{var_of_my_class} foo".  It calls
> #to_s there.
>
> But if I try instead "some string" + var_of_my_class, then ruby
> complains that it can't convert MyClass to a string.
>
> Is there anything I can do so my class will always be converted properly
> to a String by ruby, in all cases, so client code can really use it just
> like a string?
>
> Jonathan

Defining a to_str method makes String#+ work,  but I'm not sure it'll work 
everywhere. According to some documentation I found on google, defining that 
method should make the class usable in place of a string. Note, however, that 
you still have to define a to_s method if you want to change the output of 
puts.

I hope this helps

Stefano