random.h

ns2 中802.11 mac层的实现代码！

/* -*-	Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1995 Regents of the University of California.
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 *    must display the following acknowledgement:
 *	This product includes software developed by the Computer Systems
 *	Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
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 * @(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/tools/random.h,v 1.16 1999/10/09 01:06:39 haoboy Exp $ (LBL)
 */

#ifndef ns_random_h
#define ns_random_h

#include <math.h>
#include "config.h"
#include "rng.h"

class Random {
private:
	static RNG *rng() { return RNG::defaultrng(); }

public:
	static void seed(int s) { rng()->set_seed(RNG::RAW_SEED_SOURCE, s); }
	static int seed_heuristically() { rng()->set_seed(RNG::HEURISTIC_SEED_SOURCE); return rng()->seed(); };

	static int random() { return rng()->uniform_positive_int(); }
	static double uniform() { return rng()->uniform_double();}
	static double uniform(double r) { return rng()->uniform(r); }
	static double uniform(double a, double b) { return rng()->uniform(a,b); }
	static double exponential() { return rng()->exponential(); }
	static int integer(int k) { return rng()->uniform(k); }
	static double exponential(double r) { return rng()->exponential(r); }
	static double pareto(double scale, double shape) { return rng()->pareto(scale, shape); }
        static double paretoII(double scale, double shape) { return rng()->paretoII(scale, shape);}
	static double normal(double avg, double std) { return rng()->normal(avg, std); }
	static double lognormal(double avg, double std) { return rng()->lognormal(avg, std); }
};

#endif