#### ssl::stream::async_handshake

Start an asynchronous SSL handshake.

    template<
        typename HandshakeHandler>
    DEDUCED async_handshake(
        handshake_type type,
        HandshakeHandler && handler);
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    template<
        typename ConstBufferSequence,
        typename BufferedHandshakeHandler>
    DEDUCED async_handshake(
        handshake_type type,
        const ConstBufferSequence & buffers,
        BufferedHandshakeHandler && handler);
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