[boost] Any interest in an "opaque iterator" library?

Hi folks, I've been working on an "opaque iterator" library that is designed to do for iterators what the pimpl idiom does for classes in general. A motivating example and some experimental code can be found here: http://www.mr-edd.co.uk/?p=36 Before I take it further I'd like to know if there's any interest in having such a library within the boost collection so I can start refactoring it in the rough direction needed for formal review. Thanks, Edd