...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::algorithm::is_less — is_less functor
// In header: <boost/algorithm/string/compare.hpp> struct is_less { // public member functions template<typename T1, typename T2> bool operator()(const T1 &, const T2 &) const; };