This would require the user to specify "using boost::lower_bound" if he wants to implement a custom_partition for one of his own iterators outside namespace boost, right?
Why do you say that a using declaration is needed? What's wrong with calling lower_bound with qualification?
Arguably, to be compatible with code that does not know anything about boost, in the spirit of ADL, the following lower_bound should redirect to partition_point( CustomIt, CustomIt, pred): using std::lower_bound; CustomIt itA, itB; lower_bound( itA, itB ); Do we agree that this is how the client side should work? The only way to achieve that, as far as I can see, is to implement a lower_bound for each and every iterator that defines its own partition_point. Or do you have an idea? Arno -- Dr. Arno Schoedl · aschoedl@think-cell.com Technical Director think-cell Software GmbH · Invalidenstr. 34 · 10115 Berlin, Germany http://www.think-cell.com · phone +49-30-666473-10 · toll-free (US) +1-800-891-8091 Directors: Dr. Markus Hannebauer, Dr. Arno Schoedl · Amtsgericht Charlottenburg, HRB 85229