[PD] route - pack issue

Ivica Ico Bukvic ico at vt.edu
Sat Jul 9 10:33:18 CEST 2011



Jonathan Wilkes <jancsika at yahoo.com> wrote:

>
>
>--- On Fri, 7/8/11, Ivica Ico Bukvic <ico at vt.edu> wrote:
>
>> From: Ivica Ico Bukvic <ico at vt.edu>
>> Subject: RE: [PD] route - pack issue
>> To: "Jonathan Wilkes" <jancsika at yahoo.com>
>> Cc: pd-list at iem.at
>> Date: Friday, July 8, 2011, 8:12 PM
>> 
>> 
>> Jonathan Wilkes <jancsika at yahoo.com>
>> wrote:
>> 
>> >
>> >
>> >--- On Fri, 7/8/11, Ivica Ico Bukvic <ico at vt.edu> wrote:
>> >
>> >> From: Ivica Ico Bukvic <ico at vt.edu>
>> >> Subject: RE: [PD] route - pack issue
>> >> To: "'Jonathan Wilkes'" <jancsika at yahoo.com>
>> >> Cc: pd-list at iem.at
>> >> Date: Friday, July 8, 2011, 4:54 PM
>> >> > static void pack_list(t_pack *x,
>> >> t_symbol *s, int ac, t_atom *av)
>> >> > {
>> >> >     if (ac==0)
>> >> >         pack_bang(x);
>> >> >     else
>> >> >     
>> >>    obj_list(&x->x_obj, 0, ac, av);
>> >> > }
>> >> 
>> >> 
>> >> Many thanks for this contribution! I will add this
>> to
>> >> pd-l2ork. However, shouldn't also route output
>> bang when
>> >> having an empty list?
>> >
>> >[route] already does this.
>> 
>> But I thought OP suggested [route start] -> [pack] did
>> not work since pack received empty list instead of bang and
>> did not know what to do with it.
>
>Well, [route] isn't the only one that can output an empty list-- the
>[list] family objects, [trigger], and probably others do, too.
>
>Anyway, I think there are only some special cases where this gets
>tricky: when an object class defines both a bang method and a list
>method like [pack] does, or with an object like [route] which just has
>a list method as a catchall in which "bang", "float", and "symbol"
>messages are parsed manually.
>
>Otherwise, Pd does some automagic message conversion (defined in
>m_class.c) so that, for example, if [foo] only has a "bang" method and
>no list method, it will just call the "bang" method when an empty list
>is received at its inlet.  So one needn't worry whether or not an
>object outputs an empty list, just if the special case objects like
>[pack] and [route] handle them correctly.

So, are you suggesting therefore that route needs to be fixed as well or just pack?

>
>-Jonathan
>
>> 
>> >
>> >> 
>> >> Best wishes,
>> >> 
>> >> Ico
>> >> 
>> >>
>> 
>> 
>> Ivica Ico Bukvic, D.M.A
>> Composition, Music Technology
>> Director, DISIS Interactive Sound & Intermedia Studio
>> Director, L2Ork LinuxLaptop Orchestra
>> Assistant Co-Director, CCTAD
>> CHCI, CS, and Art (by courtesy)
>> Virginia Tech
>> Department of Music
>> Blacksburg, VA 24061-0240
>> (540) 231-6139
>> (540) 231-5034 (fax)
>> disis.music.vt.edu
>> l2ork.music.vt.edu
>> ico.bukvic.net
>>


Ivica Ico Bukvic, D.M.A
Composition, Music Technology
Director, DISIS Interactive Sound & Intermedia Studio
Director, L2Ork LinuxLaptop Orchestra
Assistant Co-Director, CCTAD
CHCI, CS, and Art (by courtesy)
Virginia Tech
Department of Music
Blacksburg, VA 24061-0240
(540) 231-6139
(540) 231-5034 (fax)
disis.music.vt.edu
l2ork.music.vt.edu
ico.bukvic.net



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