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        Returns T::lowest_layer_type if it exists, else T
      
        Defined in header <boost/beast/core/type_traits.hpp>
      
template< class T> struct get_lowest_layer
        This will contain a nested type
        equal to T::lowest_layer_type if it exists, else type will be equal to T.
      
Declaring a wrapper:
template<class Stream> struct stream_wrapper { using next_layer_type = typename std::remove_reference<Stream>::type; using lowest_layer_type = typename get_lowest_layer<stream_type>::type; };
Defining a metafunction:
template<class T> using is_stream_wrapper : std::integral_constant<bool, ! std::is_same<T, typename get_lowest_layer<T>::type>::value> {};
        Convenience header <boost/beast/core.hpp>