...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::call_traits<T &>
// In header: <boost/detail/call_traits.hpp> template<typename T> struct call_traits<T &> { // types typedef T & value_type; typedef T & reference; typedef const T & const_reference; typedef T & param_type; };