74 lines
2.6 KiB
C++
74 lines
2.6 KiB
C++
/* $NetBSD: random.h,v 1.2 2003/12/28 17:49:10 thorpej 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* 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
|