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## Reference

### Header <boost/ref.hpp>

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