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Module:No globals: Difference between revisions
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4 revisions imported from wikipedia:Module:No_globals: see Topic:Vtixlm0q28eo6jtf
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m (4 revisions imported from wikipedia:Module:No_globals: see Topic:Vtixlm0q28eo6jtf) |
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local mt = getmetatable(_G) or {} | |||
function mt.__index (t, k) | |||
if 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) | |||