Start an asynchronous SSL handshake.

template<
    typename HandshakeHandler>
void-or-deduced async_handshake(
    handshake_type type,
    HandshakeHandler handler);
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template<
    typename ConstBufferSequence,
    typename BufferedHandshakeHandler>
void-or-deduced async_handshake(
    handshake_type type,
    const ConstBufferSequence & buffers,
    BufferedHandshakeHandler handler);
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