[PD] route - pack issue

[Jonathan Wilkes]

--- On Sat, 7/9/11, 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: Saturday, July 9, 2011, 10:33 AM
> 
> 
> 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.

What I mean is that you only need to insure that the special case objects handle messages at their inlet correctly.  And in this case, I think [route] already does the correct thing.

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

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
>