On 1/15/22 20:09, forkit wrote:
> so at this link: https://dlang.org/spec/arrays.html
>
> it indicates an array of type[] is of type 'Dynamic array'.
I have a problem with calling type[] a dynamic array because it is a
slice, which may be providing access to the elements of a dynamic array.
One complexity in D's slices is that they will start providing access to
a dynamic array upon appending or concatenation.
Here is the proof:
void main() {
int[2] data;
int[] slice = data[];
}
'slice' has *nothing* to do with any dynamic array. Period!
It will provide access to one with the following operation:
slice ~= 42;
Again, 'slice' is not a dynamic array; it provides access to the
elements of one. (That dynamic array is owned by the D runtime (more
precisely, the GC).)
Despite that reality, people want dynamic arrays in the language and
call slices dynamic arrays. Ok, I feel better now. :)
> with that in mind, I ask, is this below a 'Dynamic array'.
Nothing different from what I wrote above.
> If not, why not?
>
>
> int[][] mArr2 = array(iota(1, 9).chunks(2).map!array.array);
mArr2 is a slice of slices. We can see from the initialization that
there are many dynamic arrays behind the scenes.
The outermost array() call is unnecessary because array() of a slice
will produce another slice with the same type (perhaps e.g. a 'const'
might be dropped) and elements. This is the same:
int[][] mArr2 = iota(1, 9).chunks(2).map!array.array ;
Ali
