I use boost::asio::read (or may be the equivalent async_read) to read some data from a socket.
Is it possible that I leave the bytes read in the underlying socket so that next time I call read on the socket I receive again that data ?
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I use boost::asio::read (or may be the equivalent async_read) to read some data from a socket.
Is it possible that I leave the bytes read in the underlying socket so that next time I call read on the socket I receive again that data ?
Like Simon said, you can’t do it with
boost::asio::read()(orboost::asio::async_read()). However, forread()you could callnative_handle()on the socket to get the socket descriptor and then use::recvmsg()with theMSG_PEEKflag. Similarly, you could callasync_read()withnull_buffers()as the receive buffer and then use thenative_handle()/::recvmsg()trick to peek the data. Check out this section of the boost documentation for how to use null_buffers().