File: readonly.lua

package info (click to toggle)
redis 2%3A2.8.17-1%2Bdeb8u5
  • links: PTS, VCS
  • area: main
  • in suites: jessie
  • size: 6,524 kB
  • ctags: 9,607
  • sloc: ansic: 71,922; tcl: 9,383; perl: 3,931; sh: 3,602; makefile: 1,001; ruby: 244
file content (12 lines) | stat: -rw-r--r-- 260 bytes parent folder | download | duplicates (65) 
1
2
3
4
5
6
7
8
9
10
11
12
 
-- 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'