/// Obtain the netmask that corresponds to the address, based on its address
/// class.
static address_v4 netmask(const address_v4& addr)
{
if (addr.is_class_a())
return address_v4(0xFF000000);
if (addr.is_class_b())
return address_v4(0xFFFF0000);
if (addr.is_class_c())
return address_v4(0xFFFFFF00);
return address_v4(0xFFFFFFFF);
}
/// Create an IPv4-compatible IPv6 address.
static address_v6 v4_compatible(const address_v4& addr)
{
address_v4::bytes_type v4_bytes = addr.to_bytes();
bytes_type v6_bytes = { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
v4_bytes[0], v4_bytes[1], v4_bytes[2], v4_bytes[3] } };
return address_v6(v6_bytes);
}
/// Create an IPv4-mapped IPv6 address.
static address_v6 v4_mapped(const address_v4& addr)
{
address_v4::bytes_type v4_bytes = addr.to_bytes();
bytes_type v6_bytes = { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF,
v4_bytes[0], v4_bytes[1], v4_bytes[2], v4_bytes[3] } };
return address_v6(v6_bytes);
}
/// Compare addresses for ordering.
friend bool operator>=(const address_v4& a1, const address_v4& a2)
{
return a1.to_ulong() >= a2.to_ulong();
}
/// Compare addresses for ordering.
friend bool operator<=(const address_v4& a1, const address_v4& a2)
{
return a1.to_uint() <= a2.to_uint();
}
/// 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());
}
