...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_any_of — is_any_of predicate
// In header: <boost/algorithm/string/classification.hpp> template<typename RangeT> unspecified is_any_of(const RangeT & Set);