countUntil for SortedRange

[Laeeth Isharc via Digitalmars-d-learn]

Hi.

Basic question: suppose I have a SortedRange and want to find the 
index of the first entry of an array of structs matching a needle 
struct.

What's the best way to do that?  It's not clear that countUntil 
treats a SortedRange specially.

I could get the lowerBound and then length or walkLength (can't 
remember which applies).

But I figure there must be a better way.

Thanks.


Laeeth.