[C++-sig] Calling python from c++ with tuple and dict args.

[Alex Mohr]

> [Nat] I find myself wondering what *dict should produce -- an error?

It's a good question.  I think it should be an error, but I'm not sure 
how it should manifest itself.  *dict needs to produce a valid object 
(so we can invoke * on it), but that object will have an API that will 
likely not really work anywhere other than where it is meant to, and we 
can provide overloads for the places where we expect it might 
accidentally be used.  For instance:

bp::object::operator()(unpacked_tuple const &,
     /* result of *dict */ intermediate_unpacked_dict const &) {

    // compile-time-error
}

Incidentally, the same general idea is true about unpacked_tuple and 
unpacked_dict -- we need to try to make sure that they only make sense 
in only the case of the specific operator() on object.

Alex