Creates a new gio.InetAddressMask representing all addresses whose first length bits match addr.
a gio.InetAddress
number of bits of addr to use
a new gio.InetAddressMask, or NULL on error
GException on failure. ConstructionException GTK+ fails to create the object.
2.32
Creates a new gio.InetAddressMask representing all addresses whose first length bits match addr.