[PD] symbol anxiety
Frank Barknecht
fbar at footils.org
Tue Feb 24 10:07:35 CET 2009
Hallo,
Mathieu Bouchard hat gesagt: // Mathieu Bouchard wrote:
> On Mon, 23 Feb 2009, Phil Stone wrote:
>
>> Oh! Very good. I didn't realize that an identical symbol would get
>> re-used. For completeness' sake, I will make a new [ps-stopwatch] that
>> does not leak (and is plain vanilla, to boot).
>
> Yes, it's re-used, which sort of goes with the fact that it doesn't get
> de-allocated, but that is also because it's less trouble (for pd itself)
> to have eternal symbols than mortal symbols.
>
> But the re-use also goes with the fact that it's easier and faster to
> compare two symbol addresses (t_symbol *) than two string contents, and
> if pd _ensures_ re-use, then two identical addresses _mean_ two identical
> strings.
>
> But all this pd symbol concept comes essentially as-is from 1961 LISP. It
> was then adopted by LOGO and Smalltalk in addition to all of the LISP
> variants, and then by Ruby, and then the Ruby guys figured out that in
> the end, a symbol type could be pretty useless if you had a good enough
> string type, so they almost merged them. Most other languages just have
> had a string type and improved on that instead of having symbol-vs-string
> or just symbols. All this to say I'm in favour of replacing symbols with
> strings (while still calling them "symbols" just because).
Is there a difference between symbols and immutable strings like Lua
or Java have them?
Ciao
--
Frank Barknecht Do You RjDj.me? _ ______footils.org__
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