How to check whether an empty array variable is null?

[Jonathan M Davis via Digitalmars-d-learn]

On Saturday, October 10, 2015 15:20:02 tcak via Digitalmars-d-learn wrote:
> [code]
>   int[] list;
>
>   list = new int[0];
>
>   std.stdio.writeln("Is Null ? ", (list is null));
> [/code]
>
> Result is "Is Null? true".
>
> Is this the correct behaviour? I would expect compiler to point
> to an address in the heap, but set the length as 0. So, it
> wouldn't return null, but the length would be 0 only.

It basically didn't bother to allocate an array on the heap, because you
asked for one with a length of zero. Efficiency-wise, it makes no sense to
allocate anything. You wouldn't be doing anything with the memory anyway.
The only way that you're going to get an array of length 0 which doesn't
have a null ptr is to slice an array down to a length of 0.

- Jonathan M Davis