Re: [MIT-Scheme-devel] SUBSTRING and SET-STRING-MAXIMUM-LENGTH!

[Chris Hanson]

I'd also write STRING-HEAD! in Scheme.

For that matter, writing STRING-MAXIMUM-LENGTH and
SET-STRING-MAXIMUM-LENGTH! in Scheme would probably improve
performance.  Inlining the Scheme code would be equivalent to
open-coding.

On Sat, Sep 5, 2009 at 4:38 PM, Taylor R Campbell<address@hidden> wrote:
>   Date: Sat, 5 Sep 2009 16:29:27 -0700
>   From: Joe Marshall <address@hidden>
>
>   I assumed that SET-STRING-MAXIMUM-LENGTH! was called for
>   efficiency reasons, otherwise SUBSTRING would work just fine.
>
> I imagine that the time to set a string's maximum length and then read
> it is negligible; what's important is the time to copy a string large,
> and the pressure it puts on the garbage collector.
>
> As an aside, I just noticed that STRING-MAXIMUM-LENGTH and
> SET-STRING-MAXIMUM-LENGTH! are not open-coded.  Is there a reason for
> this, beyond just that nobody wrote open-coders for them?
>