Re: dlang.org/Learn "hello_world".sort.chain ...

[Marko Merpovich via Digitalmars-d-learn]

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?


The error message suggests that `SortedRange!(Result, "a < b")` 
is the type returned by the `sort` function. For additional 
insights and assistance, you can explore resources like online 
dissertation help literature review 
https://literaturereviewwritingservice.com/ This type represents 
a sorted range of elements, possibly of type `Result`, sorted 
based on the comparison predicate `"a < b"`. To understand it 
better, you may need to inspect its definition or consider 
alternative methods for printing its type.

Re: dlang.org/Learn "hello_world".sort.chain ...

[Sergey via Digitalmars-d-learn]

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

Re: dlang.org/Learn "hello_world".sort.chain ...

[tony via Digitalmars-d-learn]

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

Re: dlang.org/Learn "hello_world".sort.chain ...

[Sergey via Digitalmars-d-learn]

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