Address(u8 a, u8 b, u8 c, u8 d, u16 port);
	Address(const IPv6AddressBytes *ipv6_bytes, u16 port);
	bool operator==(const Address &address);
	bool operator!=(const Address &address);
	// Resolve() may throw ResolveError (address is unchanged in this case)
	void Resolve(const char *name);
	struct sockaddr_in getAddress() const;
	unsigned short getPort() const;
	void setAddress(u32 address);
	void setAddress(u8 a, u8 b, u8 c, u8 d);
	void setAddress(const IPv6AddressBytes *ipv6_bytes);
	struct sockaddr_in6 getAddress6() const;
	int getFamily() const;
	bool isIPv6() const;
	bool isZero() const;
	void setPort(unsigned short port);
	void print(std::ostream *s) const;
	std::string serializeString() const;
private:
	unsigned int m_addr_family;
	union
	{
		struct sockaddr_in  ipv4;
		struct sockaddr_in6 ipv6;
	} m_address;
	u16 m_port; // Port is separate from sockaddr structures
};

class UDPSocket
{
public:
	UDPSocket() { }
	UDPSocket(bool ipv6);
	~UDPSocket();
	void Bind(Address addr);

	bool init--trackplacer.lua
--holds code for the track-placing system. the default 'track' item will be a craftitem that places rails as needed. this will neither place or change switches nor place vertical rails.

--all new trackplacer code
local tp={
	tracks={}
}

function tp.register_tracktype(nnprefix, n_suffix)
	if tp.tracks[nnprefix] then return end--due to the separate registration of slopes and flats for the same nnpref, definition would be overridden here. just don't.
	tp.tracks[nnprefix]={
		default=n_suffix,
		single_conn={},
		single_conn_1={},
		single_conn_2={},
		double_conn={},
		double_conn_1={},
		double_conn_2={},
		--keys:conn1_conn2 (example:1_4)
		--values:{name=x, param2=x}
		twcycle={},
		twrotate={},--indexed by suffix, list, tells order of rotations
		modify={},
	}
end
function tp.add_double_conn(nnprefix,<