libera/commonlisp - IRC Chatlog

12:13:23 agm beach: i still don't have a full grasp of CLOS, let alone MOP ;)

12:31:34 jmercouris Let's say I have a multiline string

12:31:43 jmercouris and I want to replace the newlines with a character

12:31:46 jmercouris how do I do that?

12:32:16 yitzi substitute

12:32:45 jmercouris yitzi: substitute what?

12:33:06 yitzi https://novaspec.org/cl/f_substitute

12:33:06 jmercouris I'm asking how can I reference the newline characters?

12:33:40 random-nick are they only linefeeds? (unix newlines)

12:33:47 yitzi `(substitute #\w #\newline str)

12:34:42 jmercouris let me try

12:36:54 jmercouris I see, thanks yitzi

12:37:40 yitzi yw

12:50:51 beach agm: You will learn.

12:53:42 agm :)

14:11:34 dnhester is it possible to simply initialize a class based on a given object? Say I have an object of class A, and class A inherits from class B, and I want to initialize an object of class B with the same fields as A The reason is that I want to remove certain slot values from the object but I want to keep another instance with the values Without just doing (with-slots...)

14:11:55 dnhester *slots instead of fields

14:18:38 dnhester maybe this: I will try, sharing for confirmation https://lisp-docs.github.io/cl-language-reference/chap-7/h-h-dictionary/change-class_standard-generic-function

14:24:42 dnhester worked like a charm! change-class :D

14:25:19 dnhester beach: thanks for answering the question the other day on reinitialize-instance, it helped me find the right answer by reading the reference

14:50:04 beach Great!

14:52:05 beach About your previous question, you don't initialize the class, but the instance.

14:58:52 beach So "Say I have an instance a of class A, and an instance b of class B, and A is a subclass of class B, and I want to turn b into an instance of A. The reason is that I want to modify certain slots of a, but I want to keep the old slot values of a in b." Yes?

15:00:00 kenanb Here is my latest CL related blog post that's hopefully interesting to some: https://blog.kenanb.com/code/lisp/2024/02/14/means-of-production.html

15:00:29 beach dnhester: So my question is, why is b and instance of B and not of A in the first place?

15:05:36 beach s/and/an/

16:54:37 childlikempress ** NICK Mondenkind

19:57:06 skin Out of curiosity: does anyone know which is faster on SBCL? `(setf (subseq a 0 (length b)) b)` or `(replace a b :start1 0 :end1 (length b))`?

19:58:20 pkal skin: Seems like the former macro-expands to the latter

19:58:20 bike the setf macroexpands to pretty much the latter, so probably neither

19:58:32 pkal (LET* ((#:SEQUENCE A) (#:END (LENGTH B)) (#:NEW1 B)) (REPLACE #:SEQUENCE #:NEW1 :START1 0 :END1 #:END) #:NEW1)

20:00:16 skin Cool

22:11:11 younder How do I get a asdf system to report the directory it was loaded from?

22:17:12 josrr maybe (asdf:system-source-directory (asdf:find-system "sistem-name"))

22:20:47 younder josrr. thanks.

23:41:23 Kingsy is it possible if I have a class to iterate over all slots on that class? I am trying to create a method that makes it easy to build a hashmap of the class without having to manually setf for each slot. its annoying with classes that have lots of slots.

23:51:20 clothespin class-slots

23:54:06 Kingsy clothespin: I don't know what that is.. its undefined. its not in cl?