[Boost-users] help needed on random libary

From: Deng Kun (dengkun1977_at_[hidden])
Date: 2004-11-28 16:14:56

can someone tell me how to seed the random library?
I am having some problem with the following code
the seed method won't compile on solaris but works fine on windows
especially in the "else" part
die->engine().seed((unsigned int)(s));

gives me some error.

#ifndef RANDOMBITSET_H
#define RANDOMBITSET_H

#include <stdlib.h>
#include <boost/random.hpp>
#include <boost/dynamic_bitset.hpp>

class RandomBitset {

public:
   typedef boost::mt19937 EngineType;
   typedef boost::bernoulli_distribution<> DistType;
   typedef boost::variate_generator<EngineType, DistType> DieType;

   EngineType rng;
   DistType dist;
   DieType *die;

   RandomBitset(double p=0.5): rng(), dist(p){
       die= new DieType(rng, dist);
   }

   RandomBitset(const RandomBitset & r){
       rng=r.rng;
       dist=r.dist;
       if (die!=NULL)
       {
           delete die;
       }
       die= new DieType(rng,dist);
   }

   virtual ~RandomBitset(){
       delete die;
   }

   //force reseed
   //input s<0 will use system time to reseed
   //otherwise use s as seed
   void seed(int s=-1){
       if (s<0)
       {
                       long rs=time(NULL);
                       srand(rs);
                       die->engine().seed((unsigned int) rand());
       }else {
           die->engine().seed((unsigned int)(s));
       }
   }

   void randomBitset(boost::dynamic_bitset<> & bs);

};

#endif //RANDOMBITSET_H