[/
    Copyright (c) 2023 Mireo

    Distributed under the Boost Software License, Version 1.0. (See accompanying
    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
]

[section:is_authenticator is_authenticator concept]

`is_authenticator` represents authenticator object that needs to have following functions:

 void async_auth(
	 ``[reflink2 auth_step_e async_mqtt5::auth_step_e]`` auth_step, // authentication stage
	 std::string server_data, // server authentication data
	 ``[asioreflink any_completion_handler any_completion_handler]``<
		 void(
			 __ERROR_CODE__ ec, // non-trivial error code aborts authentication
			 std::string auth_data // client authentication data
		 )
	 >
 );
 std::string_view method(); // returns authentication method


[endsect]