array depth template

[Saaa]

>
> It's kind of the right idea, but.. it's also kind of weird.
>
> template ArrayDepth(T: T[]) { const ArrayDepth = 1 + ArrayDepth!(T); }
> template ArrayDepth(T)       { const ArrayDepth = 0; }
>
> This lets you get the depth of any array _type_, like
> ArrayDepth!(int[][]) gives 2.

Ah , that's how you make it do at compile time, using const.

BCS also did it a bit like me (one template that is) I just didn't know you 
could also just pass the type :D
Any advantage to using two?

He also does :  is( T B ==B[])  iso  is( T B:B[] )
Any significant difference there?