...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::stl_interfaces::v1::v1_dtl::plus_eq<Iterator, DifferenceType, void_t< decltype(std::declval< Iterator & >()+=std::declval< DifferenceType >())>>
// In header: <boost/stl_interfaces/iterator_interface.hpp> template<typename Iterator, typename DifferenceType> struct plus_eq<Iterator, DifferenceType, void_t< decltype(std::declval< Iterator & >()+=std::declval< DifferenceType >())>> : public true_type { };