Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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Reference

Header <boost/ref.hpp>

Header <boost/ref.hpp>

namespace boost {
  template<typename T> class reference_wrapper;
  reference_wrapper<T> ref(T&);
  reference_wrapper<T const> cref(T const&);
  template<typename T> class is_reference_wrapper;
  template<typename T> class unwrap_reference;
}