[PD] pd_defaultbang to non-default list handler

[Jonathan Wilkes]

 > On Sunday, June 21, 2020, 12:13:19 PM EDT, Miller Puckette via Pd-list <pd-list at lists.iem.at> wrote:

> As far as I know, there's no design necessity that says it has to be zero.
The selector in this case is unspecified. One could invent one ("foo"
would be fine) or leave it at zero.

> Perhaps objects should not depend on knowing a selector that might be
undefined.

Thanks, Miller.

-Jonathan

> cheers
> Miller

On Sun, Jun 21, 2020 at 12:55:47AM +0200, Christof Ressi wrote:
> > I guess what I'm trying to ask is if there's a design constraint that
> > requires the selector to be null in said code. Or
> > better yet-- if the code were changed so that the selector is *never*
> > null would bad things happen?
> The selector is not *required* to selector to be NULL, but it *can* be NULL,
> with the only merit that it saves you a few characters.
>
> > if the code were changed so that the selector is *never* null would bad
> > things happen?
> In the above mentioned discussion, IOhannes has offered two patches: 1)
> don't use NULL selectors internally, 2) gracefully handle NULL selectors
> (e.g. coming from externals)
>
> Those patches obviously haven't been merged, but I think they should be
> reconsidered.
>
> Christof
>
>
> On 21.06.2020 00:47, Jonathan Wilkes wrote:
> > > On Saturday, June 20, 2020, 6:34:02 PM EDT, Christof Ressi
> > <info at christofressi.com> wrote:
> >
> > > In pd_defaultbang, what is the reasoning for calling the list method
> > > with a null selector while calling the
> > > anything method with an "&s_bang" selector?
> > > contrary to the list method, the selector for the anything method
> > *does* carry significant meaning. At the very least, it's necessary for
> > the default anything method (which prints an error message).
> >
> > I guess what I'm trying to ask is if there's a design constraint that
> > requires the selector to be null in said code. Or
> > better yet-- if the code were changed so that the selector is *never*
> > null would bad things happen?
> >
> > Thanks,
> > Jonathan
> >
> > Christof
> >
> > On 21.06.2020 00:29, Christof Ressi wrote:
> >
> > Ah, sorry, I misread you're last reply. I thought you were repeating
> > your first question :-)
> >
> > On 21.06.2020 00:24, Christof Ressi wrote:
> >
> > Did you read the discussion I've linked too? To quote Miller:
> >
> > > I'm not sure this is a real problem - _anything and _list methods
> > > simply aren't guaranteed
> > > anything about the "s" argument - it shouldn't ever be dereferenced.
> >
> > I think this is the answer to your question. Since the selector of a
> > list message is actually redundant, you're free to pass NULL.
> >
> > Christof
> >
> > On 21.06.2020 00:16, Jonathan Wilkes wrote:
> > > On Saturday, June 20, 2020, 4:02:44 PM EDT, Christof Ressi
> > <info at christofressi.com> <mailto:info at christofressi.com> wrote:
> >
> >
> > > Hi, the selector for a list method certainly shouldn't be "bang",
> > rather it should be "list".
> >
> > Let's back up.
> >
> > Miller,
> >
> > In pd_defaultbang, what is the reasoning for calling the list method
> > with a null selector while calling the
> > anything method with an "&s_bang" selector?
> >
> > Thanks,
> > Jonathan
> >
> > > There has been a discussion about this in the past and I have agree
> > with IOhannes that Pd shouldn't send NULL selectors: https://urldefense.com/v3/__https://sourceforge.net/p/pure-data/patches/555/__;!!Mih3wA!QsXvdm7PGfv5RyslUUuP4q13RXWyW2YlDB0Amsou_ol-eFRc-JQZBR6LaLUw$
> > .
> >
> > > Christof
> >
> > On 20.06.2020 21:19, Jonathan Wilkes via Pd-list wrote:
> > Hi Miller,
> >
> > In pd_defaultbang of m_class.c, why does the list method get called with
> > "0" for a selector instead of "&s_bang" for the c_listmethod invocation?
> >
> > Best,
> > Jonathan
> >
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