generic array functions and vector operations

[Bent Rasmussen]

I wanted to test out array operations and create some nice generic functions 
for dealing with vectors. One function is defined as

A[n] lerp(A, uint n)(A t, A[n] a, A[n] b)
{
    return a[] + t * (b[] - a[]);
}

It looks pretty elegant with array operations, but I can't return a static 
array. Is this a bug or missing feature and if not how might one get similar 
elegant syntax without sacrificing efficiency?

I'm not sure the "uint n" part is even valid, but it made sense as it is 
allowed in templates in general.

How would you define and deal with vectors in D?

Bent