Re: [Boost-users] multi-inheritance from elements of mpl::vector? ==> inherit_scattered ( for Barton & Nackmann trick)

writes:

no reply - so I found a solution by myself (used for the Barton & Nackmann trick)! template< typename D > struct F { std::string f() { return static_cast< D & >( * this).str_; } };

template< typename D > struct G { std::string g() { return static_cast< D & >( * this).str_; } };

That's not the B&N trick; it's simple CRTP. The B&N trick is the one where you stick a friend function that applies to the derived class in the base class. See the operators library for reference. -- Dave Abrahams Boost Consulting www.boost-consulting.com