How to sort a range

[Xinok via Digitalmars-d-learn]

On Wednesday, 9 March 2016 at 15:39:55 UTC, rcorre wrote:
> Still curious as to why it fails; maybe the range is getting 
> copied at some point? I guess I need to step through it.

That's my suspicion as well. It seems that OnlyResult is 
pass-by-value so every time it gets passed to another function, 
it creates a copy of all the elements. A simple solution is to 
provide a wrapper type which refers to the elements in the 
original container.

However, I'm going to argue that the sort function is fine but 
the modifications you made to OnlyResult are incorrect. I tried 
running your example of only(...).sort but got a compilation 
error. Similarly, trying to sort a static array also gives a 
compilation error. However, if I slice the static array before 
passing it to sort (thus passing by reference), then it works 
just fine.