Start an asynchronous SSL handshake.
template< typename ConstBufferSequence, typename BufferedHandshakeToken = DEFAULT> DEDUCED async_handshake( handshake_type type, const ConstBufferSequence & buffers, BufferedHandshakeToken && token = DEFAULT);
This function is used to asynchronously perform an SSL handshake on the stream. It is an initiating function for an asynchronous operation, and always returns immediately.
The type of handshaking to be performed, i.e. as a client or as a server.
The buffered data to be reused for the handshake. Although the buffers object may be copied as necessary, ownership of the underlying buffers is retained by the caller, which must guarantee that they remain valid until the completion handler is called.
token that will be used to produce a completion handler,
which will be called when the handshake completes. Potential completion
yield_context, or a function
object with the correct completion signature. The function signature
of the completion handler must be:
void handler( const boost::system::error_code& error, // Result of operation. std::size_t bytes_transferred // Amount of buffers used in handshake. );
Regardless of whether the asynchronous operation completes immediately
or not, the completion handler will not be invoked from within
this function. On immediate completion, invocation of the handler
will be performed in a manner equivalent to using
This asynchronous operation supports cancellation for the following
if they are also supported by the