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#### basic_socket_streambuf::bytes_readable

Inherited from socket_base.

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.

###### Example

    boost::asio::ip::tcp::socket socket(io_service);
    ...
    boost::asio::socket_base::bytes_readable command(true);
    socket.io_control(command);
    std::size_t bytes_readable = command.get();

###### Requirements

Header: `boost/asio/basic_socket_streambuf.hpp`

Convenience header: `boost/asio.hpp`