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src/biu/RandomNumberFactory.cc

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#include "biu/RandomNumberFactory.hh"
#include <biu/assertbiu.hh>

namespace biu
{

    // default random number generator
    RandomNumberGenerator* RandomNumberFactory::rng = new RNG_ISO();
    
    // pointer object to random generator function for RNF usage with STL
    // algorithms like stl::random_shuffle
    unsigned int (*RandomNumberFactory::pt_getRN)(unsigned int) = &RandomNumberFactory::getRN;


    RandomNumberFactory::RandomNumberFactory()
    {
    }
    
    RandomNumberFactory::~RandomNumberFactory()
    {
    }
    
    RandomNumberGenerator&
    RandomNumberFactory::getRNG() {
        return *rng;
    }
    
    void
    RandomNumberFactory::setRNG(RandomNumberGenerator& rng_) {

        delete rng; // delete old RNG
        
        rng = rng_.copy(); // set new one
    }
    
    void
    RandomNumberFactory::setRNG(RandomNumberGenerator* rng_) {

        assertbiu( rng_ != NULL, "given RNG is not available (NULL)");
        delete rng; // delete old RNG
        
        rng = rng_->copy(); // set new one
    }
    
    unsigned int
    RandomNumberFactory::getRN(void) {
        return rng->getRN();
    }
    
    unsigned int 
    RandomNumberFactory::getRN(unsigned int max) {
        assertbiu(max != 0, "maximal value == 0 would cause division by zero");
        return rng->getRN()%max;
    }
    
    unsigned int
    RandomNumberFactory::getMaxRN(void) {
        return rng->getMaxRN();
    }
    
} // namespace