type MyDriver struct {} func (d *MyDriver) CreateNetwork(nid string, options map[string]interface{}) error { // implementation return nil } func (d *MyDriver) DeleteNetwork(nid string) error { // implementation return nil } // Remaining methods of DriverCallback interface... func main() { driver := &MyDriver{} callback := driverapi.DriverCallback(driver) // register driver with libnetwork err := libnetwork.Initialize(callback) if err != nil { log.Fatal(err) } // use libnetwork for networking operations }In this code example, a custom network driver is defined by implementing the DriverCallback interface. The driver is then registered with libnetwork using the Initialize function. After that, the library can be used to perform networking operations.