After a quick look at the Assignment library, it would appear that this

"Powell, Gary" <powellg@amazon.com> wrote in message news:16D81990DBE42642A8CA977A55FF116A02D9F637@ex-mail-sea-02.ant.amazon.com... library would benefit from a "container traits" library that it could query for things like whether to use "insert" or "push" to call for make_insertion() rather than specify each std::stl container. It's only on vc6 that each header is included; normal compilers can do much better. I think there is a way to do this without including each header, but it probably won't work with many compilers. So it all depends on a portable hack that can detect member functions or member typedefs of certain names.

It just doesn't seem to be very extensible. Rather wouldn't it be better if a user could define the traits class for your container and then the assignment would pick the >right one?

Maybe. Why do you think its better with a traits class compared to a ADL of a user-overloaded function? br Thorsten