Read some message data.
template< class MutableBufferSequence> std::size_t read_some( MutableBufferSequence const& buffers, error_code& ec);
This function is used to read some message data. The call blocks until one of the following is true:
The algorithm, known as a composed operation, is
implemented in terms of calls to the next layer's
got_text may be used to query
the stream and determine the type of the last received message. The function
is_message_done may be called
to determine if the message received by the last read operation is complete.
Until the call returns, the implementation will read incoming control
frames and handle them automatically as follows:
The number of message payload bytes appended to the buffer.
A buffer sequence to write message data into. The previous contents of the buffers will be overwritten, starting from the beginning.
Set to indicate what error occurred, if any.
This asynchronous operation supports cancellation for the following net::cancellation_type values:
if the operation is suspended due to ongoing control operations such
as a ping/pong.
cancellation succeeds when supported by the underlying stream.
terminal cancellation leaves the stream
in an undefined state, so that only closing it is guaranteed to succeed.