Re: T[new]

[Walter Bright]

grauzone wrote:
will
T[new] a;

allocate something?

Nope.

Or will the allocation of the hidden library array 
object delayed until the length is set to non null?

Yes.

If the library array 
object is not allocated, will a.ptr, a.capacity and a.length simply 
return null?

Yes. Clearly, those properties will have to be functions under the hood. 
So T[new] operations will be a bit slower than for slices. For faster 
indexing, you'd probably want to do:

auto slice = a[];

and then operate on the slice.