Range and poolTask

[moechofe via Digitalmars-d-learn]

On Monday, 6 June 2016 at 11:25:00 UTC, Rene Zwanenburg wrote:
> Could you elaborate a bit?

Yes.

I have an InputRange and need to pass it throughout a couple of 
iteration and manipulation functions such as filter, map and 
finishing by grouping with fold. Like:
----
myrange
.filter!xxx
.map!yyy
.tee!zzz
.fold!www
----

This process take a lot of time, so I decide to put it in 
parallel. I did something like this:
----
Appender!www output;
foreach(iii; parallel(myrange))
{
     only(iii)
     .filter!xxx
     .map!yyy
     .tee!zzz
     .copy(output)
}
output.fold!www;
----
only() will create a Range with one item in it. Also, I can't 
group directly. I
  need to use a second Range.

It works but it's not elegant as the non-working example above is.