[boost] Re: MultiMethod/Visitor Interest

David Abrahams writes:

Yeah. It's hard to imagine how "compile-time multimethods" would be

any different from what C++ already provides in terms of overload

resolution and partial ordering.

The main difference is that they work when particular types of participants are unknown at compile time. It is just like trying to implement unary virtual method using overloading. Jesse Jones writes:

Can a static library do better type

checking? In particular can it figure out, at compile time, if there

are no applicable methods or no unambiguous method?

Yes. The compile-time library detects ambiguity and absence of proper method. It is compile-time error.