|  | 
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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