From: Michael Neumann <mneumann@...>
Date: 2004-12-14T03:24:27+09:00
Subject: Re: Hash freezes String keys are returns copy

ts wrote:
>>>>>>"M" == Michael Neumann <mneumann@ntecs.de> writes:
> 
> 
> M> okay... but isn't it the same when using a String?
> 
>  this is made volontary for efficienty : otherwise each time that you
>  modify an object, used as a key, ruby will need to re-hash the hash if you
>  don't want to have strange result like the example that I've given
> 
>  In reality when you write
> 
>    a = "test"
>    hash[a] = "test"
> 
>  the key and `a' share the same string, but `a' is marked copy-on-write
> 
> M> they behave differently.
> 
>  Search the archive of [ruby-talk] for this :-)

Ah, IIRC it has something to do with common usage of strings as keys.


Regards,

   Michael