[redis.git] / deps / lua / test / readonly.lua

-- make global variables readonly

local f=function (t,i) error("cannot redefine global variable `"..i.."'",2) end
local g={}
local G=getfenv()
setmetatable(g,{__index=G,__newindex=f})
setfenv(1,g)

-- an example
rawset(g,"x",3)
x=2
y=1	-- cannot redefine `y'
Commit	Line	Data
21d3294c	1	-- make global variables readonly
	2
	3	local f=function (t,i) error("cannot redefine global variable `"..i.."'",2) end
	4	local g={}
	5	local G=getfenv()
	6	setmetatable(g,{__index=G,__newindex=f})
	7	setfenv(1,g)
	8
	9	-- an example
	10	rawset(g,"x",3)
	11	x=2
	12	y=1 -- cannot redefine `y'