Re: rfi: immutable strings

[Andy Wingo]

On Fri 07 Jan 2011 19:52, Mike Gran <address@hidden> writes:

>> Guile needs immutable strings.
>
> How is this different from read-only strings?

Seems to be the same.  We should have read-only string API though;
currently there is only substring API.  One should be able to allocate a
read-only string directly, like via
scm_from_static_latin1_{stringn,symboln}.  Also, strings loaded from
objcode should be read-only, and share storage with the objcode itself;
perhaps?

>> Also, the result of (symbol->string 'foo) should be immutable;
>> currently symbol->string conses up a new shared substring every time.

Though the result is immutable, it does cons up a shared substring,
which involves all kinds of mutex and allocation shenanigans.

Andy
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