Creates a new #GInetAddressMask representing all addresses whose first @length bits match @addr.
a #GInetAddress
number of bits of @addr to use
Return: a new #GInetAddressMask, or %NULL on error
GException on failure. ConstructionException GTK+ fails to create the object.
2.32
See Implementation
Creates a new #GInetAddressMask representing all addresses whose first @length bits match @addr.