I just typed in the program that is on the first page of Learn. It has this line:

sort(chain(arr1, arr2, arr3));

I assigned that to a variable:

arr4 = sort(chain(arr1, arr2, arr3));

then printed it out

writefln("%s",arr4); // works

and then tried to print out the type of arr4:

writefln("%s",typeof(arr4));

and got this error:

// HelloWorld.d:25:19: error: cannot pass type SortedRange!(Result, "a < b") as a function argument

What exactly is that type? Or maybe, what would it take to understand what that type is?

On Tuesday, 26 December 2023 at 10:53:10 UTC, Tony wrote:

Use typeid, instead of typeof

On Tuesday, 26 December 2023 at 11:19:29 UTC, Sergey wrote:

Thanks!

Got quite a type but I will worry about that later: std.range.SortedRange!(Result, "a < b").SortedRange

On Tuesday, 26 December 2023 at 13:58:54 UTC, tony wrote:

Yes, because sort is returning special type, compatible with Ranges interface.
You can add 'sort(...).array' and the type will become 'int[]' (or which types arrays were before).

Ranges are specific things for D (one of the core feature of the lang and std), which can evaluated lazily. You can check some description how they are working in the documentation https://dlang.org/phobos/std_range.html