On 10-11-14 11:59 PM, Joe Neeman wrote:
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.
filter works on things that understand car and cdr; which elements
clearly doesn't, because it's just a "boxing" wrapper around
Grob_array*. What I am doing is go to a list first, and then filtering:
(define (live-elements-list me)
(filter grob::is-live? (grob-array->list (ly:grob-object me 'elements))))
where grob-array->list is a function which I just made.
The reason I am asking, is because even after spending 10 minutes
looking at the procedural-style code in the current live-elements-list,
I am still not sure what the answer is to the question, "what does this
function do?" Does it just filter the elements according to
grob::is-live?? Or does it do something more / less / different? Quite
seriously, it's just hard to be sure.
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