gaussianDistributionRandom

import std.math : isClose;
import std.random : isUniformRNG;

struct Rng 
{
    @property real front() const @nogc nothrow pure @safe scope { return 0.5; }
    @property bool empty() const @nogc nothrow pure @safe scope { return false; }
    void popFront() @nogc nothrow pure @safe scope {}
    enum isUniformRandom = true;
    enum max = 1.0;
    enum min = 0.0;
}
static assert(isUniformRNG!Rng);

auto rng = Rng();
immutable result1 = gaussianDistributionRandom!real(rng);
assert(result1.isClose(cast(real) -0x9.6b55f2257e218fep-3));
immutable result2 = gaussianDistributionRandom!real(rng);
assert(result2.isClose(cast(real) -0x9.6b55f2257e218fep-3));