A while back, Erik Niebler was testing the waters for inclusion of his very, very clever looping construct into boost, but nothing really came of it. Erik's technique is described here: http://www.nwcpp.org/Meetings/2004/01.html Yup, macros are involved and they are yucky, and yup, there already exists a for_each in the standard that works just fine if you care to move your loop body away into a function, and yup, the name BOOST_FOREACH could use a little love. But there is no denying the notational clarity and succinctness of e.g.: foreach(double &d, container) d += 2; Versus the rather redundant: for (list<double>::iterator i = container.begin(); i !=container.end(); ++i) *i += 2; (Note that the latter stops working if container is represented using a vector or a built-in array instead) /Michael Toksvig