[Boost-users] Using single-pass ranges.

I have a class that hands out a sequence of Things through a getNextThing() interface, ie., struct Thing { }; struct ThingFeed { Thing * getNextThing( ); }; returning null when there's no more things. I'd like to be able to feed this into the Boost range-based algorithms, something like boost::for_each( thingFeedProxy | filter( someCondition ), doSomething ); But it's not clear to me how or if I can represent my ThingFeed as a range. Any thoughts or advice appreciated. Thx, Rob