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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