Dear Boost users, A (possibly naïve) question, as I'm a reasonably competent C programmer but only a relative novice with C++, and just starting to get used to concepts from libraries like Boost. The BOOST_FOREACH macro provides a nice way to iterate over all the contents of a container like a vector, list, etc. But what about when several containers are involved? I'll give a concrete-ish example from a problem I'm working on. I have two vectors, vector<myClass *> v1 and vector<double> v2 where myClass is a base class and v1.size()==v2.size(). Then, what I want to do is, for(unsigned int i=0;i<v1.size();++i) v1.at(i)->func(v2.at(i)); That works, of course; I'm just wondering if there is a more elegant or compiler-friendly way of writing this along the lines of the BOOST_FOREACH macro. Initialising separate iterators for both v1 and v2 seems ugly/lots of boilerplate. I have seen the solution here: http://permalink.gmane.org/gmane.comp.lib.boost.user/31954 ... but that seems less desirable because it involves using an extra library which I don't think is standard in Linux distros. I have the impression that the zip_iterator boost lib is useful here, but did not fully understand if or how. Can anyone advise? Thanks & best wishes, -- Joe