...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::op::make_pair::result<This(First, Second)>
// In header: <boost/xpressive/regex_actions.hpp> template<typename This, typename First, typename Second> struct result<This(First, Second)> { // types typedef std::pair< typename remove_const< typename remove_reference< First >::type >::type, typename remove_const< typename remove_reference< Second >::type >::type > type; };