[Boost-users] fork() example asio 1_52_0

Hi...do you know what it means the parameters "_1" and "_2"? socket_.async_read_some(boost::asio::buffer(data_),boost::bind(&server::handle_read, this, _1, _2)); the complete example is: http://think-async.com/Asio/boost_asio_1_5_2/doc/html/boost_asio/example/for...