To my knowledge as long as you try to do something like this:

USE AdventureWorks2012

GO

DECLARE @totalrows int

SELECT *, @totalrows = TotalRows

FROM (

SELECT JobTitle,

BusinessEntityID,

ROW_NUMBER() OVER (ORDER BY BusinessEntityID) as RowNum,

COUNT(*) OVER () as TotalRows ---- nice to know how many total rows when paging to know how many pages are there

FROM HumanResources.Employee) AS t

WHERE RowNum BETWEEN 5 AND 15

you are going to get an error like this:

Msg 141, Level 15, State 1, Line 3

A SELECT statement that assigns a value to a variable must not be combined with data-retrieval operations.

I can't think of a way off the top of my head to get the total EXPECTED rows while also FILTERING to a restricted set for output in a single pass. You store the data and use @@ROWCOUNT and then SELECT final set out (possibly using just key values to make a smaller temp objects - I have used that to GREAT effect in paging scenarios at clients over the years) or you do one hit as a count to set the output parameter and a second to get the data. With good indexing it can still be "fast", but clearly not as fast as if you could get the total with the restricted set...