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IO control command to get the amount of data that can be read without blocking.
typedef implementation_defined bytes_readable;
Implements the FIONREAD IO control command.
boost::asio::ip::tcp::socket socket(my_context); ... boost::asio::socket_base::bytes_readable command(true); socket.io_control(command); std::size_t bytes_readable = command.get();
Header: boost/asio/socket_base.hpp
Convenience header: boost/asio.hpp