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From: | Stefan Monnier |
Subject: | Re: Edit a cl-struct by copy, or, slot-value for cl-structs |
Date: | Fri, 29 Oct 2021 15:15:45 -0400 |
User-agent: | Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
> (mapcar #'cl--slot-descriptor-name > (cl--struct-class-slots (get (type-of obj) 'cl--class))) > > But I can’t get any further as I can’t find any generic getter and > setter for cl-struct’s. Something like slot-value. So close! The position of the slot descriptor in `cl--struct-class-slots` mirrors the position of the slot in the actual objet, so you just need `aref/aset`. It would also make a lot of sense to replace/extend the useless `:copier` thingy of `cl-defstruct` with something like the `:constructor`, so you could say (cl-defstruct (my-foo (:copier my-foo-with) (:copier my-foo-with-a (b a))) a b c) and then use (my-foo-with foo :c 42) and (my-foo-with-a foo 153 "42") Stefan
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