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From: Dmitry Gutov <dmitry@gutov.dev>
Newsgroups: gmane.emacs.devel
Subject: Re: What's missing in ELisp that makes people want to use cl-lib?
Date: Fri, 17 Nov 2023 04:47:41 +0200
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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On 17/11/2023 04:44, Stefan Monnier wrote:
>> But cl-defmethod with just one method resulting in a simple function
>>   definition in an experimental fact (evaluate (cl-defmethod abc () 345);
>>   then (cl-defmethod abc () 345) returns (lambda nil (progn 345))), so that
>> must be faster, without any computation of applicable methods.
> "one method" is necessary but not sufficient for this optimization.
> This one method has to have no specializer (aka only the `t` specializer).
> 
>> The comment above the code you quoted mentions "generic functions with
>> a single method"; maybe it was written before the above optimization
>> was made.
> No, that comment refers to the case where there's a single method but
> with a non-t specializer, so we can't just always call that one method
> without first testing that the arg matches the specializer.

Makes sense. Thanks!