* How to do defmethod dispatch based on the type of a struct's slot?
@ 2024-05-04 21:57 Okamsn
2024-05-05 10:55 ` Michael Heerdegen via Users list for the GNU Emacs text editor
0 siblings, 1 reply; 2+ messages in thread
From: Okamsn @ 2024-05-04 21:57 UTC (permalink / raw)
To: help-gnu-emacs@gnu.org
Hello,
I am trying to test using a `cl-defstruct` structure to represent a
sub-sequence, which would implement `seq-map`. In the structure, I have
a slot that contains the original sequence. I would like to be able to
use different forms of `seq-map` based on the type of the original
sequence. I am having trouble understanding how to create a specializer
and a generalizer for this.
Is there a way to create a specializer for `cl-defmethod`, something
like `(cl-defmethod seq-map (function (sequence (my-test-subseq array)))
...)` ?
I have tried using a type defined via `cl-deftype` as the specializer
using the `satisfies` type, but that did not seem work. Do types defined
via `cl-deftype` work as specializers?
Thank you.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: How to do defmethod dispatch based on the type of a struct's slot?
2024-05-04 21:57 How to do defmethod dispatch based on the type of a struct's slot? Okamsn
@ 2024-05-05 10:55 ` Michael Heerdegen via Users list for the GNU Emacs text editor
0 siblings, 0 replies; 2+ messages in thread
From: Michael Heerdegen via Users list for the GNU Emacs text editor @ 2024-05-05 10:55 UTC (permalink / raw)
To: help-gnu-emacs
Okamsn <okamsn@protonmail.com> writes:
> Hello,
>
> I am trying to test using a `cl-defstruct` structure to represent a
> sub-sequence, which would implement `seq-map`. In the structure, I have
> a slot that contains the original sequence. I would like to be able to
> use different forms of `seq-map` based on the type of the original
> sequence. I am having trouble understanding how to create a specializer
> and a generalizer for this.
'STRUCT-TYPE' is not possible as specializer?
> I have tried using a type defined via `cl-deftype` as the specializer
> using the `satisfies` type, but that did not seem work. Do types defined
> via `cl-deftype` work as specializers?
Not out of the box AFAIU.
Michael.
^ permalink raw reply [flat|nested] 2+ messages in thread
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