Re: [ANN] New library stream.el in ELPA

[Michael Heerdegen <michael_heerdegen@web.de>]

Nicolas Petton <nicolas@petton.fr> writes:

> The generic `stream' function currently accepts lists, strings, arrays
> and buffers as input, but it can be cleanly extended to support pretty
> much any kind of data.

I have a question: For implementing the diverse generic seq functions
(`seq-p', `seq-elt', `seq-length') for streams you use `cl-defgeneric'
all the time, e.g.

--8<---------------cut here---------------start------------->8---
(cl-defgeneric seq-elt ((stream stream) n)
  "Return the element of STREAM at index N."
  (while (> n 0)
    (setq stream (stream-rest stream))
    (setq n (1- n)))
  (stream-first stream))
--8<---------------cut here---------------end--------------->8---


But according to the doc of `cl-defgeneric' and `cl-defmethod', this
seems the perfect use case for `cl-defmethod':

"[...] it defines the implementation of NAME to use for invocations where
the value of the dispatch argument matches the specified TYPE."

So why do you use `cl-defgeneric' - what do I miss?


Regards,

Michael.