...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::operator|| — predicate 'or' composition predicate
// In header: <boost/algorithm/string/classification.hpp> template<typename Pred1T, typename Pred2T> unspecified operator||(const predicate_facade< Pred1T > & Pred1, const predicate_facade< Pred2T > & Pred2);