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From: Philipp Stephani
Newsgroups: gmane.emacs.help
Subject: Re: How to specialize seq-concatenate and seq-into-sequence?
Date: Fri, 4 Mar 2022 21:56:12 +0100
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To: Michael Heerdegen
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Archived-At:
> Am 04.03.2022 um 03:35 schrieb Michael Heerdegen =
:
>=20
> Philipp Stephani writes:
>=20
>>> Define `it`.
>>> The dispatch is expected to be on the `type` argument (using an
>>> `eql` specializer).
>>>=20
>>=20
>> Doesn't that contradict the docstring?
>=20
> I'm also a bit confused. How would you concatenate a list and a =
stream
> to a list? Or how would you implement it?
I guess the idea is that `seq-concatenate' can only be specialized for =
new *result* types, not for new *argument* types. That is, if you have =
a new sequence-like type `my-sequence', you can specialize it like so:
(cl-defmethod ((_type (eql my-sequence)) &rest sequences)
(my-sequence-concatenate (mapcar #'convert-to-my-sequence sequences)))
where `my-sequence-concatenate' and `convert-to-my-sequence' are =
functions specific to the new sequence type. It's not possible to =
convert a `my-sequence' to a list this way; for that you'd need to =
specialize `seq-into' or `seq-into-sequence' instead.=