From: FlSt@gmx.de
The new Perl 6 has a nice feature called junctions. See http://www.perl.com/pub/a/2003/07/29/exegesis6.html?page=4 and http://www.metaperl.com/talks/p6-junctions/ for more information. I think this is a interesting way to save the time for writing loops in some situations. I've tried to implement this for C++ and uploaded a version with two examples into the Boost Sandbox File Vault (flos_super_position.zip). This version works for my purposes, but if you interested i would rework it and submit it to the boost library.
The idea of an object that can be any, all, one, or none of the elements of a set of inputs and can then participate in comparisons and set operations sounds intriguing. I haven't looked at your code yet, though. -- Rob Stewart stewart@sig.com Software Engineer http://www.sig.com Susquehanna International Group, LLP using std::disclaimer;