A base class for ostreams that write to a (possibly non-blocking) socket. It adds
is_closed(), which can be called after any write operation fails to check whether the socket has been closed, or whether more data may be sent later.
virtual void close(void) = 0
Sends the most recently queued data now. This only has meaning if
set_collect_tcp()has been set to true.
virtual bool is_closed(void) = 0
- virtual void close(void) = 0