Can we just have struct inheritence already?

[Vladimir Panteleev]

On Tuesday, 11 June 2019 at 06:29:58 UTC, Walter Bright wrote:
> 1. How would an array of 0 size elements work, when the pointer 
> past the end is the same as the pointer to the start?
>
> 2. How would you determine the dimension of an array of 0 size 
> elements?
>
>     sizeof(Array)/sizeof(Array[0])
>
> ? Oops!

But... 0-length arrays in D are already 0 bytes in size.

struct S
{
	int a;
	ubyte[0] b;
	int c;
}

pragma(msg, S.tupleof.offsetof); // tuple(0LU, 4LU, 4LU)
pragma(msg, S.b.sizeof);         // 0LU

We actually take advantage of this by declaring hashsets as 
void[0][Key].

The same applies to two-dimensional 0-length arrays (T[0][0]), 
which would make them an array with 0-size elements. I don't 
think that's been a problem.