randdist.cpp

template<typename RNG=std::default_random_engine, typename ResultType=float>
struct RandomDistributionGenerator
{
    RNG rng;
    std::uniform_real_distribution<ResultType> distrib_uniform;
    std::normal_distribution<ResultType> distrib_normal;
    std::exponential_distribution<ResultType> distrib_expo;
    std::cauchy_distribution<ResultType> distrib_cauchy;
    RandomDistributionGenerator() {}
    RandomDistributionGenerator(unsigned int seed) : rng(seed) {}
    void setSeed(unsigned int seed) { rng.seed(seed); }
    void setUniformDistributionParameters(ResultType low, ResultType high) 
    { 
        distrib_uniform = std::uniform_real_distribution<ResultType>(low,high); 
    }
    void setNormalDistributionParameters(ResultType mean, ResultType deviation)
    {
        distrib_normal = std::normal_distribution<ResultType>(mean,deviation);
    }
    void setExponentialDistributionParameter(ResultType lambda)
    {
        distrib_expo = std::exponential_distribution<ResultType>(lambda);
    }
    void setCauchyDistributionParameters(ResultType quasimean, ResultType deviation)
    {
        distrib_cauchy = std::cauchy_distribution<ResultType>(quasimean,deviaton);
    }
    ResultType nextUniform() { return distrib_uniform(rng); }
    ResultType nextNormal() { return distrib_normal(rng); }
    ResultType nextExponential() { return distrib_expo(rng); }
    ResultType nextCauchy() { return distrib_cauchy(rng); }
};