LUA constant

function constant(who)local smt = function(who)local mtt = {__index = function(t,k)return who[k]end,__newindex = function(t,k,v)if(who[k] == nil) then  who[k] = v;endend}return mtt;endlocal tag = {}setmetatable(tag, smt(who))return tagendfunction main()local PROTOCOLS = constant({TCP=1,UDP=2,ICMP=3,RAW=4})PROTOCOLS.IDP = 9;print(PROTOCOLS.TCP);PROTOCOLS.TCP = 5;print(PROTOCOLS.TCP)print(PROTOCOLS.IDP)endxpcall(main, function(msg)end)