pow

t
{
    enum meter = unit!(double, "L");
    enum liter = 0.001 * meter * meter * meter;

    auto surface = 25 * square(meter);
    auto side = sqrt(surface);
    assert(side.value(meter).approxEqual(5));

    auto volume = 27 * liter;
    side = cbrt(volume);
    assert(side.value(meter).approxEqual(0.3));

    auto delta = -10 * meter;
    assert(abs(delta) == 10 * meter