Difference between revisions of "Module:No globals"
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en>Jackmcbarn (don't bother saving old __index or __newindex) |
en>Jackmcbarn (setting doesn't need exception for name) |
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| Line 7: | Line 7: | ||
end | end | ||
function mt.__newindex(t, k, v) | function mt.__newindex(t, k, v) | ||
if | if k ~= 'arg' then | ||
error('Tried to write global ' .. tostring(k), 2) | error('Tried to write global ' .. tostring(k), 2) | ||
end | end | ||
Revision as of 20:48, 23 April 2014
Documentation for this module may be created at Module:No globals/doc
local mt = getmetatable(_G) or {}
function mt.__index (t, k)
if k ~= 'name' and k ~= 'arg' then
error('Tried to read nil global ' .. tostring(k), 2)
end
return nil
end
function mt.__newindex(t, k, v)
if k ~= 'arg' then
error('Tried to write global ' .. tostring(k), 2)
end
rawset(t, k, v)
end
setmetatable(_G, mt)