...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::dynamic_cast_ — dynamic_cast_
is a lazy funtion for dynamically casting a parameter to a different type.
// In header: <boost/xpressive/regex_actions.hpp> template<typename T, typename A> unspecified dynamic_cast_(A const & a);