/// Compare addresses for ordering.
friend bool operator>=(const address_v4& a1, const address_v4& a2)
{
return a1.to_ulong() >= a2.to_ulong();
}
/// Obtain an address object that represents the broadcast address that
/// corresponds to the specified address and netmask.
static address_v4 broadcast(const address_v4& addr, const address_v4& mask)
{
return address_v4(addr.to_ulong() | ~mask.to_ulong());
}
