David Kastrup <d...@gnu.org> writes: > GOOPS was supposed to cause quite a performance hit with Guile 1.8 when > used extensively. It wasn't supposed to do this with Guile 2+ so > something like this should be feasible, also for other types: > > #(use-modules (oop goops)) > > #(define <Moment> (class-of (ly:make-moment 0))) > > #(define-method (+ (a <Moment>) (b <Moment>)) (ly:moment-add a b)) > #(define-method (- (a <Moment>) (b <Moment>)) (ly:moment-sub a b)) > > #(display (- (ly:make-moment 3) (ly:make-moment 4) (ly:make-moment 2))) > > For those types where manipulation is frequent enough that we defined > arithmetic (and possibly other) operators rather than ordinary functions > in C++, there may be some point in doing the same in Scheme with > generics.
Putting a bit more meat on what this may mean: <https://gitlab.com/lilypond/lilypond/-/merge_requests/1404> -- David Kastrup
