Reuse of Recursive Queries

I have a recursive query which I use to retrieve a set of identifiers. Something like:

WITH Set (Id)
AS (/* recursive code */)
SELECT Item FROM MyTable T
WHERE T.ItemId = ANY (SELECT Id FROM Set)

What I would like to achieve is to be able to reuse the code in bold in another procedure without duplicating the code (ie. reuse the query building up the set).

What I've done is to create a user-defined function which returns a TABLE parameter. So now, I have something like:

SELECT Item FROM MyTable T
WHERE T.ItemId = ANY(SELECT Id FROM MyFunction())

My question: is this the righ way of doing it? Does the use of a function incurs any relevant performance cost?

Thanks for advice.TVF would be fine. Another option is to convert it into a view.|||If you are making it as a TVF, then make sure it is inline otherwise you will have performance issues.