From 013ac7742311556022304e8b30ca170d48b3a016 Mon Sep 17 00:00:00 2001
From: "B. Watson" <yalhcru@gmail.com>
Date: Thu, 7 May 2015 16:32:32 -0400
Subject: initial commit

---
 dab/random.h | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 dab/random.h

(limited to 'dab/random.h')

diff --git a/dab/random.h b/dab/random.h
new file mode 100644
index 0000000..86b24c6
--- /dev/null
+++ b/dab/random.h
@@ -0,0 +1,66 @@
+/*	$NetBSD: random.h,v 1.3 2008/04/28 20:22:54 martin Exp $	*/
+
+/*-
+ * Copyright (c) 2003 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * random.h: Randomizer; returns a random sequence of values from [0..fx) 
+ *	     returning each value exactly once. After fx calls it returns fx.
+ */
+
+#ifndef _H_RANDOM
+#define _H_RANDOM
+
+#include <stdlib.h>
+
+class RANDOM {
+  public:
+    // Constructor and destructor
+    RANDOM(size_t fx);
+    ~RANDOM();
+
+    size_t operator () (void);	// Next random
+    void clear(void);		// Reset
+
+  private:
+
+    int isset(size_t z) {
+	return (_bm[z >> 3] & (1 << (z & 7))) != 0;
+    }
+
+    void set(size_t z) {
+	_bm[z >> 3] |= (1 << (z & 7));
+    }
+
+    char*	_bm;	// Bitmap indicating the numbers used
+    size_t	_nv;	// Number of values returned so far
+    size_t	_bs;	// Maximum value
+};
+
+#endif
-- 
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