...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
// In header: <boost/detail/call_traits.hpp> template<typename T> struct call_traits { // types typedef T value_type; typedef T & reference; typedef const T & const_reference; typedef unspecified param_type; };