From: Peter Zotov <whitequark@...>
Date: 2011-07-26T23:23:41+09:00
Subject: Re: Why aren't string literals treated similarly to  symbols?

On Tue, 26 Jul 2011 16:28:54 +0900, Robert Klemme wrote:
>> One possible fix would be something like:
>>
>> string = "example"
>> 1.upto(2) do
>>   puts string
>> end
>>
>> In this trivial case, the solution is good enough, but the general 
>> case
>> requires more knowledge about how to optimize for the interpreter 
>> than
>> should be necessary.  I'm probably missing something obvious, so if
>> anyone knows what it is, please point it out.  Maybe MRI already 
>> does
>> this obvious thing.
>
> It's doing COW already internally.
> 
> http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/branches/ruby_1_9_2/string.c?revision=31809&view=markup
>
> See e.g. lines 1984ff.  Then functions
>
> rb_str_resize
>   rb_str_modify
>     str_independent
>     str_make_independent
>
> Kind regards
>
> robert

Just wanted to mention that RXR is a bit more convenient to lookup 
things like this.
http://rxr.whitequark.org/mri/source/string.c#1761

And it has identifier search!

-- 
   WBR, Peter Zotov.