Re: Is gcc able to handle anonymous functions?

[Marc Hohl]

Am 04.07.2012 13:29, schrieb David Kastrup:
> Marc Hohl <address@hidden> 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 see that in lily/pointer-group-interface.cc the function above is 
defined as

Grob *
Pointer_group_interface::find_grob (Grob *me, SCM sym, bool (*pred) 
(Grob *))
{
  [snip]
}

What is bool (*pred) (Grob *)?

Is there a way to get a scheme function in this place, or do I have to put
the remaining definition of bar-line.cc into another file?

Regards,

Marc




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