RNG.h

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//Copyright (c) 2013-2014, The MercuryDPM Developers Team. All rights reserved.
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#ifndef RNG_H
#define RNG_H

//Used by the randomise function
#include <time.h>
#include <cmath>
#include "ExtendedMath.h"

class RNG
{
public:

    RNG(){random_seed_LCG=0; a=1103515245; c=12345;m=1024*1024*1024;type=1;p=607;q=273;random_seed_LFG.resize(p); seed_LFG();}

    // (note the call to seed_LFG is only required really if using that type of generator, but the other one is always required
    void set_RandomSeed(Mdouble new_seed){random_seed_LCG=new_seed; seed_LFG();}

    Mdouble get_RN(Mdouble min, Mdouble max);
    
    Mdouble test();
    
    void set_LCGParms(int new_a,int new_c,int new_m)
    {a=new_a;c=new_c;m=new_m;}
    
    void randomise() {set_RandomSeed(time(NULL));}
    
    void set_LFGParms(int new_p, int new_q);
    
    void set_RNtypeLCG(){type=0;}
    
    void set_RNtypeLFG(){type=1;}
    
private:

    Mdouble get_LCG(Mdouble min, Mdouble max);

    Mdouble get_LFG(Mdouble min, Mdouble max);
    
    void seed_LFG();

    unsigned long int random_seed_LCG;
    
    std::vector<Mdouble> random_seed_LFG;
    
    long int a,c,m;
    
    long int p,q;
    
    int type;
    
};


#endif