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Re: Defining new sequence types for seq.el


From: Juanma Barranquero
Subject: Re: Defining new sequence types for seq.el
Date: Tue, 12 Nov 2019 04:02:23 +0100



On Tue, Nov 12, 2019 at 1:45 AM Eric Abrahamsen <address@hidden> wrote:

> Do I need to use a struct with one slot? Any other tips?

You could do something like:

(setq my-list '(gnus-range (1 . 9) 35 120))

(cl-defgeneric seq-length ((sequence (head gnus-range)))
  (let ((l 0))
    (dolist (elt (cdr sequence))
      (cl-incf l (if (consp elt) (1+ (- (cdr elt) (car elt))) 1)))
    l))

(seq-length my-list)


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