...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::insert::result<This(Cont, Value), void>
// In header: <boost/xpressive/regex_actions.hpp> template<typename This, typename Cont, typename Value> struct result<This(Cont, Value), void> { // types typedef char yes_type; typedef char(& no_type; typedef mpl::if_c< is_iterator, typename cont_type::iterator, std::pair< typename cont_type::iterator, bool > >::type type; // public member functions typedef UNREF(Cont); typedef UNREF(Value); // public static functions static yes_type check_insert_return(typename cont_type::iterator); static no_type check_insert_return(std::pair< typename cont_type::iterator, bool >); static cont_type & scont_; static value_type & svalue_; static bool const is_iterator; };