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StreamType concept

StreamType represents the transport protocol type used to transfer stream of bytes.

StreamType should meet the AsyncStream concept.

It should follow Asio's layered stream model by having a lowest_layer_type member type, and a lowest_layer member function, returing a lowest_layer_type&. The lowest_layer_type should inherit from boost::asio::ip::tcp::socket.

Additionally, it should have an overload of async_shutdown function that is discoverable via argument-dependent lookup (ADL).

The types boost::asio::ip::tcp::socket, boost::asio::ssl::stream<boost::asio::ip::tcp::socket> and boost::beast::websocket::stream<NextLayer> meet these requirements.


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