...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::xpressive::reference
// In header: <boost/xpressive/regex_actions.hpp> template<typename T> struct reference { // types typedef proto::extends< typename proto::terminal< reference_wrapper< T > >::type, reference< T > > base_type; // construct/copy/destruct explicit reference(T &); // public member functions T & get() const; };