49 lines
1.8 KiB
Plaintext
49 lines
1.8 KiB
Plaintext
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* Automatique. Distributed only by permission. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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(function "cmp" (i: int j: int)
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(- i j))
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(function "quick" (lo: int hi: int a: addr cmp: addr)
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(if (< lo hi)
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(let (i lo
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j hi
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pivot (intaref a hi))
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(while (< i j)
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(catch
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(while 1
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(if (>= i hi) exit [])
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(if (> (app cmp [(intaref a i) pivot] int) 0) exit [])
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(assign i (+ i 1)))
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with [])
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(catch
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(while 1
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(if (<= j lo) exit [])
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(if (< (app cmp [(intaref a j) pivot] int) 0) exit [])
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(assign j (- j 1)))
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with [])
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(if (< i j)
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(let temp (intaref a i)
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(intaset a i (intaref a j))
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(intaset a j temp))
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[]))
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(let temp (intaref a i)
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(intaset a i (intaref a hi))
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(intaset a hi temp))
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(app "quick" [lo (- i 1) a cmp] unit)
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(app "quick" [(+ i 1) hi a cmp] unit))
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[]))
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(function "quicksort" (lo: int hi: int a: addr)
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(app "quick" [lo hi a "cmp"] unit))
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