default.go
func (u *IPv4) DeepCopy() *IPv4 {
	if u == nil {
		return nil
	}
	out := new(IPv4)
	u.DeepCopyInto(out)
	return out
}
func (u *IPv4) DeepCopy() *IPv4 {
	if u == nil {
		return nil
	}
	out := new(IPv4)
	u.DeepCopyInto(out)
	return out
}
// DeepCopy copies the receiver into a new IPv4.