Bob Bell wrote:

Dave-

I was looking over my "sent" items and I think something was wrong with my return address, so I'm resending this with the right address. Sorry for any confusion it may have caused.

Bob, Please post Boost questions to one of the Boost mailing lists (unless you want to hire us for consulting services, that is!)

I've been using the boost iterator adaptor library, and first let me say thanks; it's really a great library.

You're welcome :)

Having said that, however, I'm having a problem. I'm trying to build an iterator that uses both boost::filter_iterator and boost::transform_iterator, but what happens is that when I combine these two adaptors, it seems to lose the iterator category of the original iterator. That is, say I build an iterator like this:

boost::transform_iterator<SomeTransform, boost::filter_iterator<SomeFilter, int*> >

The resulting iterator only seems to be a forward iterator. My understanding is that the iterator category of the base iterator (int*), should become the category of the resulting composite. So my first question is: is this a correct understanding on my part?

Not according to http://www.boost.org/libs/iterator/doc/filter_iterator.html#filter-iterator-... A filter iterator is never more than a forward iterator. HTH, -- Dave Abrahams Boost Consulting http://www.boost-consulting.com