ndslice: convert a sliced object to T[]

[Ilya Yaroshenko via Digitalmars-d-learn]

On Wednesday, 15 June 2016 at 14:14:23 UTC, Seb wrote:
> ```
> T[] a = slice.ptr[0.. slice.elementsCount];
> ```

This would work only for slices with continuous memory 
representation and positive strides. -- Ilya