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Re: Should we be touching goops?

From: David Kastrup
Subject: Re: Should we be touching goops?
Date: Tue, 07 Jun 2022 02:24:46 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

David Kastrup <> 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:


David Kastrup

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