Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
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boost::base_from_member
// In header: <boost/utility/base_from_member.hpp> template<typename MemberType, int UniqueID = 0> class base_from_member { public: // protected member functions template<typename ... T, typename EnableIf = unspecified> explicit base_from_member(T &&...); };