Function Parse is not available in structure FIPv4Address

I did this, but the problem is that I can write:

FIPv4Address::FIPv4Address(IpAddres.A, IpAddres.B, IpAddres.C, IpAddres.D);

But I can not write:

FIPv4Address::Parse(Ip, Address);

Because only this function is not visible (and others with definition NETWORKING_API).