Hardware Design: SIE

Hardware Design: SIE Git Source Tree

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'
13

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