DistributionRNG

import std.algorithm : map;
class NormalRNG : DistributionRNG!double
{
	double front() @property
	{
		return rNormal();
	}
}

import std.range;
auto rng = new NormalRNG;
auto sigma = 4.0;
auto mu = 2.0;
auto sample = rng.map!(x => x * sigma + mu).take(9).array;