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| ANSI Common Lisp 12 Numbers 12.2 Dictionary of Numbers
12.2.43 *random-state* | Variable
  Value Type: a random state. Initial Value: implementation-dependent. Description: The current random state, which is used, for example, by the function random when a random state is not explicitly supplied. Examples:
       (random-state-p *random-state*)  true
       (setq snap-shot (make-random-state))
       ;; The series from any given point is random,
       ;; but if you backtrack to that point, you get the same series.
       (list (loop for i from 1 to 10 collect (random))
             (let ((*random-state* snap-shot))
               (loop for i from 1 to 10 collect (random)))
             (loop for i from 1 to 10 collect (random))
             (let ((*random-state* snap-shot))
               (loop for i from 1 to 10 collect (random))))
       ((19 16 44 19 96 15 76 96 13 61)
          (19 16 44 19 96 15 76 96 13 61)
          (16 67 0 43 70 79 58 5 63 50)
          (16 67 0 43 70 79 58 5 63 50))
Affected By: The implementation. random. See Also: make-random-state, random, random-state Notes: Binding *random-state* to a different random state object correctly saves and restores the old random state object. Allegro CL Implementation Details: None.

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