Multidimensional array access
Ali Çehreli via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Tue Dec 20 12:17:37 PST 2016
On 12/20/2016 11:59 AM, somebody wrote:
> I though D should have syntax similarities with C, but recently I've
> found that array indexing in D is different. Suppose we have a code:
>
> import std.stdio;
>
> void main ()
> {
> wstring[6][2] strings;
> strings[2][0] = "test";
> }
>
>
> It fails to compile because of error:
>
> "./main.d(6): Error: array index 2 is out of bounds strings[0 .. 2]"
>
> Why? There should be 6 rows and 2 columns, but it seems that it's the
> opposite. Am I misunderstood something or is it a bug?
>
Yes, opposite.
C's array declaration mimics the way arrays are used in code: first row,
then column. In D, array declarations are always "type followed by
square brackets";
int[N] arr;
Array of arrays follow the same consistent definition: first type, then
the square brackets. So if we need an array of 6 elements where the type
of elements is int[2], then we follow that description (space added for
emphasis):
int[2] [6] arr;
Ali
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