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Re: The empty string and other empty strings

From: Mark H Weaver
Subject: Re: The empty string and other empty strings
Date: Tue, 10 Jan 2012 10:41:10 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.92 (gnu/linux)

Mike Gran <address@hidden> wrote:
>> Right now it seems that zero-length shared substring of a wide string is
>> wide.  A zero-length substring still shares the stringbuf of the
>> original string.
> [...]
>> What do you think about that?  Do zero-length substrings need to
>> still share stringbufs with their parent strings?

I wrote:
> I think the answer is: no they don't, and avoiding that might be a
> worthwhile optimization, mainly to avoid needlessly holding a reference
> to a potentially large stringbuf.

I went ahead and committed this optimization.  Empty substrings are now
always freshly allocated, and never hold a reference to the original

I also added another optimization: `scm_i_make_string' now uses a common
null_stringbuf when creating empty strings.  The string object itself is
still freshly allocated.


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