Thanks !
>
> Shuffling is usually implemented in-place. A random element is picked,
> swapped with last one, and then range is decreased. Something like this:
>
> void shuffle(T)(T[] array)
> {
> int len = array.length;
> while (len > 1) {
> int offset = random(0, len); // get a random value that belongs to [0,
> len)
> --len;
> swap(array[offset], array[len]);
> array.length = len;
> }
> }
>
> The algorithm is very simple. However, user might not be satisfied with
> "default" distribution and thus be able to provide his own random number
> generator. That's what "SomeRandomGen" object is needed for.
>
> From a quick glance, I didn't find meaningful explanation and requirements
> for this type (i.e. what methods and properties set it should provide), but
> it should be described in the docs somewhere.
>
> Unit-test shows the following use-case:
>
> auto a = ([ 1, 2, 3, 4, 5, 6, 7, 8, 9 ]).dup;
> Mt19937 gen;
> randomShuffle(a, gen);
>
> As a side note I'd add that you should better use Random instead of Mt19937
> (the former being an alias to the latter), because it is easier to read and
> understand (I bet too many people exclaim "wtf is that??" when they first see
> a class named "Mt19937").
