On Sun, Nov 14, 2010 at 5:19 PM, Boris Shingarov <b...@shingarov.com> wrote:
> In scm/output-lib.scm, the (internally used) function live-elements-listis > defined like this: > > (define (live-elements-list me) > (let* ((elements (ly:grob-object me 'elements)) > (elts-length (ly:grob-array-length elements)) > (live-elements '())) > > (let get-live ((len elts-length)) > (if (> len 0) > (let ((elt (ly:grob-array-ref elements (1- len)))) > > (if (grob::is-live? elt) > (set! live-elements (cons elt live-elements))) > (get-live (1- len))))) > live-elements)) > > Any specific reason why not just filter on the is-live? predicate? > Doesn't filter just work on plain scheme lists? elements is a grob-array object. Of course, if filter doesn't work on such objects it might be better to write a version of filter rather than replicating it many times. > Also, is there a real difference between grob::is-live? and > ly:is-live?predicates? (I would be inclined to get rid of > grob::is-live? version...) > I couldn't find ly:is-live? ... Joe
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