#### ssl::stream::async_handshake

Start an asynchronous SSL handshake.

    template<
        typename HandshakeToken = default_completion_token_t<executor_type>>
    DEDUCED async_handshake(
        handshake_type type,
        HandshakeToken && token = default_completion_token_t< executor_type >());
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    template<
        typename ConstBufferSequence,
        typename BufferedHandshakeToken = default_completion_token_t<executor_type>>
    DEDUCED async_handshake(
        handshake_type type,
        const ConstBufferSequence & buffers,
        BufferedHandshakeToken && token = default_completion_token_t< executor_type >(),
        constraint_t< is_const_buffer_sequence< ConstBufferSequence >::value >  = 0);
      » more...