From: Robert Klemme <shortcutter@...>
Date: 2011-04-15T22:00:05+09:00
Subject: Re: Get the real object in a Hash key

On Fri, Apr 15, 2011 at 2:50 PM, Iņaki Baz Castillo <ibc@aliax.net> wrote:
> However I've realized right now that it's not possible. The hash key
> doesn't store the given key as a reference to such object:

This is a special optimization for unfrozen Strings as Hash keys.

> Now I have another question:
>
> --------------------
> myobject = MyCustomClass.new
>
> @h = {}
>
> @h[myobject] = "lalalala"
> --------------------
>
> In this case, will Ruby GC delete myobject? or will it remain alive as
> it has been used as a key of a hash (which is not GC'd in a supposed
> code)?

The key stays alive at least as long as the Hash instance.

Cheers

robert


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