Initial import of the CDE 2.1.30 sources from the Open Group.

cde/programs/dtinfo/DtMmdb/utility/pm_random.h

@@ -0,0 +1,61 @@
+/*
+ * $XConsortium: pm_random.h /main/4 1996/06/11 17:38:21 cde-hal $
+ *
+ * Copyright (c) 1992 HAL Computer Systems International, Ltd.
+ * All rights reserved.  Unpublished -- rights reserved under
+ * the Copyright Laws of the United States.  USE OF A COPYRIGHT
+ * NOTICE IS PRECAUTIONARY ONLY AND DOES NOT IMPLY PUBLICATION
+ * OR DISCLOSURE.
+ * 
+ * THIS SOFTWARE CONTAINS CONFIDENTIAL INFORMATION AND TRADE
+ * SECRETS OF HAL COMPUTER SYSTEMS INTERNATIONAL, LTD.  USE,
+ * DISCLOSURE, OR REPRODUCTION IS PROHIBITED WITHOUT THE
+ * PRIOR EXPRESS WRITTEN PERMISSION OF HAL COMPUTER SYSTEMS
+ * INTERNATIONAL, LTD.
+ * 
+ *                         RESTRICTED RIGHTS LEGEND
+ * Use, duplication, or disclosure by the Government is subject
+ * to the restrictions as set forth in subparagraph (c)(l)(ii)
+ * of the Rights in Technical Data and Computer Software clause
+ * at DFARS 252.227-7013.
+ *
+ *          HAL COMPUTER SYSTEMS INTERNATIONAL, LTD.
+ *                  1315 Dell Avenue
+ *                  Campbell, CA  95008
+ * 
+ */
+
+
+#ifndef _pm_random_h
+#define _pm_random_h 1
+
+#include "utility/macro.h"
+#include "utility/funcs.h"
+
+
+// from CACM 88.10 Park and Miller's paper.
+// rewritten to have important member functions inline.
+class pm_random {
+
+public:
+   pm_random(int sd = 19) ;	
+   virtual ~pm_random() {};
+
+   void seed(int = 19);
+   int initial_seed() { return v_i_seed; };
+   int current_seed() { return v_new_seed; };
+   int rand() {
+      int tmp = v_new_seed;
+      int test = 16807 * (v_new_seed % 127773) - 2836 * (v_new_seed / 127773);
+      v_new_seed = ( test > 0 ) ? test : test + 2147483647;
+      return tmp;
+   }; 
+   float rand_01() { return float(rand()) / 2147483647; };
+
+
+private:
+   int v_new_seed;
+   int v_i_seed;
+};
+
+#endif