...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::interprocess::operator==
// In header: <boost/interprocess/smart_ptr/intrusive_ptr.hpp> template<typename T, typename U, typename VP> bool operator==(intrusive_ptr< T, VP > const & a, intrusive_ptr< U, VP > const & b);