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bug#33731: 26.1; cl-make-random-state copying not working
From: |
Xu Chunyang |
Subject: |
bug#33731: 26.1; cl-make-random-state copying not working |
Date: |
Fri, 14 Dec 2018 05:12:35 +0800 |
Hi,
I am reading (info "(cl) Random Numbers") on cl-make-random-state. I
expect the following returns two equal numbers, because s should be a
copy of cl--random-state thus two cl-random should use two equal
state.
(let ((s (cl-make-random-state)))
(list (cl-random 10000)
(cl-random 10000 s)))
;; => (6955 916)
If I didn't misunderstand this, I think it is because
cl-make-random-state uses copy-tree, however it doesn't work for
cl-structure at least in Emacs 26.1, it doesn't copy at all.
(eq (cl-make-random-state 123)
(cl-make-random-state 123))
;; => nil
(let* ((s1 (cl-make-random-state 123))
(s2 (cl-make-random-state s1)))
(eq s1 s2))
;; => t
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