On 5 juil. 2012, at 08:14, Joe Neeman wrote:
>
>
> On Thu, Jul 5, 2012 at 12:37 AM, m...@apollinemike.com
> <m...@apollinemike.com> wrote:
> On 4 juil. 2012, at 20:10, Marc Hohl wrote:
>
> > Am 04.07.2012 13:29, schrieb David Kastrup:
> >> Marc Hohl <m...@hohlart.de> writes:
> >>
> >>> Hello list,
> >>>
> >>> the topic is somewhat over my head, but perhaps someone with more
> >>> insight can answer this question?
> >> I think that gcc likely can, don't know about g++, and we don't want to
> >> rely on it anyhow.
> > Ok.
> >
> > Well then, is there an alternative?
> >
> > I want to get rid of bar-line.cc (issue 1320), and I have managed to get all
> > definitions but Bar_line::non_empty_barline into scheme.
> >
> > In lily/note-spacing.cc, I have
> >
> > Grob *bar = Pointer_group_interface::find_grob (right_col,
> > ly_symbol2scm
> > ("elements"),
> > Bar_line::non_empty_barline);
> >
> > The simple approach
> >
> > bool non_empty_barline =
> > ly_scm2bool (scm_call_1 (ly_lily_module_constant
> > ("bar-line::non-empty-barline"), right_col->self_scm ()));
> >
> > with
> >
> > (define-public (bar-line::non-empty-barline grob)
> > (and (grob::has-interface grob 'bar-line)
> > (pair? (ly:grob-extent grob grob X))))
> >
> > doesn't work.
> >
> I just realized that there's an easier way to do this w/ existing code
> conventions. You can overload Pointer_group_interface::find_grob so that it
> accepts a simple closure as the third argument. Then, wrap the Scheme
> function in a simple closure.
>
>
> Why not just leave the function in C++? I have nothing against porting things
> to scheme, but in this case it just seems like an exercise in making things
> more complicated, for no gain.
>
> Cheers,
> Joe
>
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It's doable - the goal was to port the entire thing to Scheme. You're right
that it is much easier to write in C++.
I think it's exercises like that that help strengthen the Scheme bindings and
thus lead to more customizability/extensibility.
Cheers,
MS
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