D code length vs other languages

[Tobias Pankrath]

On Saturday, 7 December 2019 at 10:17:46 UTC, mipri wrote:
> On Saturday, 7 December 2019 at 09:59:01 UTC, Tobias Pankrath 
> wrote:
>> [...]
>
> You can use std.range.generate with any random closure:
>
>   import std.stdio;
>
>   void main() {
>       import std.range : take, zip, generate;
>
>       auto multiples(int n) {
>           int i;
>           return generate!({
>               return i += n;
>           });
>       }
>
>       foreach (p; zip(multiples(2), multiples(3)).take(5)) {
>           writeln(p[0], " ", p[1]);
>       }
>   }
>
> Or use std.concurrency to get the same control flow:
>
>   void main() {
>       import std.range : take, zip;
>       import std.concurrency : Generator, yield;
>
>       auto multiples(int n) {
>           return new Generator!int({
>               int i;
>               while (true) yield (i += n);
>           });
>       }
>
>       foreach (p; zip(multiples(2), multiples(3)).take(5)) {
>           writeln(p[0], " ", p[1]);
>       }
>   }

Didn't know std.concurrency.Generator, thanks!

With std.range.generate I don't know how to signal 
exhaustion/emptyness of a range. For simple infinite use cases 
it's cool though.