boost::bind with protected members & context

Question

In the below code, there are two \"equivalent\" calls to std::for_each using boost:bind expressions. The indicated line compiles, the indicated fai

Answer 1

It's all about "context". In the first call the context of the call is Derived which has access to the protected members of Base and hence is allowed to take addresses of them. In the second the context is "outside of" Derived and hence outside of Base so the protected member access is not allowed.