...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::typeindex::operator==,!=,<,...
// In header: <boost/type_index/type_index_facade.hpp> bool operator==,!=,<,...(const type_index_facade & lhs, const type_index_facade & rhs);