Jean Abou Samra <j...@abou-samra.fr> writes: > Le mardi 08 août 2023 à 19:53 +0200, Lukas-Fabian Moser a écrit : >> Yes, sure, that's what I did in my code for Alasdair. But I was more >> wondering whether or not RhythmicStaves (RhythmicStaff's?) should do >> this automatically. >> >> By the way, I didn't know about music-clone. What's its advantage over >> ly:music-deep-copy? > > As far as I understand the docstring, > > (music-clone mus 'elements new-elts) > > is more efficient than > > (let ((new-mus (ly:music-deep-copy mus))) > (ly:music-set-property! new-mus 'elements new-elts) > new-mus) > > because it will avoid deeply copying the elements list and > all its elements, by noticing that it will be overridden > by new-elts anyway.
Given that ly:music-deep-copy is written in C++, I doubt better efficiency. > Without extra arguments, (music-clone m) should be strictly > equivalent to (ly:music-deep-copy m). The extra arguments are different, and, well, it is shorter to write. -- David Kastrup
