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Re: Make a random-state from a non-random source

From Alan Bawden <alan@csail.mit.edu>
Newsgroups comp.lang.lisp
Subject Re: Make a random-state from a non-random source
Date 2026-05-05 00:45 -0400
Organization ITS Preservation Society
Message-ID <86pl3a1n3a.fsf@williamsburg.bawden.org> (permalink)
References <jwvmryfku8t.fsf-monnier+comp.lang.lisp@gnu.org>

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Stefan Monnier <monnier@iro.umontreal.ca> writes:

> Reading the CLHS about `make-random-state` I can't see how to create
> a "deterministic" random state.
>
> ...
>
> I guess I could print a random state into a file and then read it back in,
> but that depends on internals, so it's doubly messy.

That what you are intended to do.  That's why implementations are
required to provide a read syntax for objects of type RANDOM-STATE.
(See section 22.1.3.10 "Printing Random States" in the hyperspec.)

Yes, it could be more convenient, but it isn't.

- Alan

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Thread

Make a random-state from a non-random source Stefan Monnier <monnier@iro.umontreal.ca> - 2026-05-04 12:46 -0400
  Re: Make a random-state from a non-random source Alan Bawden <alan@csail.mit.edu> - 2026-05-05 00:45 -0400
    Re: Make a random-state from a non-random source Stefan Monnier <monnier@iro.umontreal.ca> - 2026-05-05 16:03 -0400
  Re: Make a random-state from a non-random source tfb <no_email@invalid.invalid> - 2026-05-09 18:20 +0000
    Re: Make a random-state from a non-random source Stefan Monnier <monnier@iro.umontreal.ca> - 2026-05-11 11:23 -0400

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