...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::proxy_arrow_result
// In header: <boost/stl_interfaces/iterator_interface.hpp> template<typename T> struct proxy_arrow_result { // public member functions proxy_arrow_result(T const &) noexcept(noexcept(T(value))); proxy_arrow_result(T &&) noexcept(noexcept(T(std::move(value)))); constexpr T const * operator->() const noexcept; constexpr T * operator->() noexcept; };