• Tony (14/14) Dec 26 2023 I just typed in the program that is on the first page of Learn.
• Sergey (2/16) Dec 26 2023 Use typeid, instead of typeof
• tony (4/5) Dec 26 2023 Thanks!
• Sergey (9/14) Dec 26 2023 Yes, because sort is returning special type, compatible with

Tony <tonytdominguez aol.com> writes:

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?

Sergey <kornburn yandex.ru> writes:

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

Use typeid, instead of typeof

tony <tonytdominguez aol.com> writes:

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

 Use typeid, instead of typeof

Thanks!

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

Sergey <kornburn yandex.ru> writes:

On Tuesday, 26 December 2023 at 13:58:54 UTC, tony wrote:
 On Tuesday, 26 December 2023 at 11:19:29 UTC, Sergey wrote:

 Use typeid, instead of typeof

 Thanks!

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

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