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
boost::interprocess::iunordered_set_index_aux::equal_function
// In header: <boost/interprocess/indexes/iunordered_set_index.hpp> struct equal_function { // public member functions bool operator()(const intrusive_compare_key_type &, const value_type &) const; bool operator()(const value_type &, const intrusive_compare_key_type &) const; bool operator()(const value_type &, const value_type &) const; };