Re: [Boost-users] variant: bounded types derive from same base class

typedef boost::variant  ABCDerived;

and the user could write visitors to visit ABCDerived objects, here the user is enforced to implement all cases in the visitor.

but then the function f expects ABC objects. Can I still do:

void f( const ABC& abc ) {   // how to write code to use the visitors with abc ? }

struct YourVisitor : boost::static_visitor<functor return type> { result_type operator()(const D1 &d1) {...} result_type operator()(const D2 &d1) {...} // etc. for all the type in the variant }; then: boost::apply_visitor(YourVisitor(), yourVariant);