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I think I'm back to my original (sort of) question then. Consider:




class Foo {

// Generic visitor that does magical dispatching of
// types and delegates passes down to your visitor...

Greetings Paul, I upgraded to boost 1.53 and the end result is the same. i.e.

main.cpp(108): error C2780: 'boost::apply_visitor_delayed_t<Visitor> boost::apply_visitor(Visitor &)' : expects 1...

Here's the code with your suggestion. Note I commented out "T visitor" in Foo and I've changed the first argument in doWork to "boost::apply_visitor ( T(), intField ) ;



# include <iostream>...

I've _already_ posted the _full_ code. Here's doWork with Foo<T>::visitor as the first argument.



# include <iostream>
# include <map>
# include <boost/variant.hpp>
# include...

Produce the error
Foo<T>::visitor': not a valid using-declaration at non-class scope
1> with
1> [
1> T=FooValueType
1> ]
1> main.cpp(103) :...

Consider,





# include <iostream>
# include <map>
# include <boost/variant.hpp>
# include <boost/mpl/vector.hpp>