On 03/31/2013 06:36 PM, Nicholas Smith wrote:> Hello there,
>
> So I noticed something about the semantics of multidimensional
> fixed-length array vs slice initialization:
>
> Code:
>
> int[2][3] array;
Obviously, like C and C++, D does not have multi-dimensional arrays but
D's array of array syntax is consistent.
When we say
A[3] a;
we mean three As. Replacing A with an array gives us this:
int[2][3] a;
Now we mean three int[2]s. This is consistent, because 'int[2]' in there
itself follows the same syntax.
> writeln(array.length, " ", array[0].length);
> int[][] slice = new int[][](2, 3);
That is very similar to a function API. It would make sense that the
outer-most index came first if it truly were a function.
> writeln(slice.length, " ", slice[0].length);
>
> Output:
>
> 3 2
> 2 3
>
> So it seems that int[2][3] means "an array of 3 int arrays of length 2",
> while new int[][](2, 3) means "an array of 2 int arrays of length 3".
>
> This seems like a direct conflict of semantics, and I was wondering
> whether this was an intentional design choice, or an oversight. Can
> anyone explain reasoning behind this?
Ali
