On Friday, 3 May 2024 at 14:59:57 UTC, BoQsc wrote:
On Friday, 3 May 2024 at 13:18:02 UTC, user1234 wrote:
On Friday, 3 May 2024 at 10:50:03 UTC, BoQsc wrote:
[...]
**You can specify the index type, just choose the right one.**
For now there's a deprecation message but after some while
you'll get a proper error message, e.g _"index type for arr
must be of type T because arr.length type is T"_.
What's is happening now is to help people updating their code
and prevent abrupt breakages.
So how would you update this example, what is the right index
type here to choose?
```
import std.stdio : writefln;
void main() {
auto arr = [
[5, 15], // 20
[2, 3, 2, 3], // 10
[3, 6, 2, 9], // 20
];
foreach (i, row; arr)
{
double total = 0.0;
foreach (e; row)
total += e;
auto avg = total / row.length;
writefln("AVG [row=%d]: %.2f", i, avg);
}
}
```
Example taken from https://tour.dlang.org/tour/en/basics/foreach
Isn't that obvious ?
```d
foreach (const size_t i, row; arr)
```
`arr` is not a static array, it is a dynamic one, consequently
its `.length` type is `size_t`, even if you have the feeling
that, in the present situation, `int` bitwidth would be
sufficient.
