...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::proto::functional::prior::result<This(BidirectionalIterator, Distance)>
// In header: <boost/proto/functional/std/iterator.hpp> template<typename This, typename BidirectionalIterator, typename Distance> struct result<This(BidirectionalIterator, Distance)> { // types typedef typename boost::remove_const< typename boost::remove_reference<BidirectionalIterator>::type >::type type; };