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cache forwarded functions to reduce memory usage #116

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cache forwarded functions to reduce memory usage #116

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5 changes: 4 additions & 1 deletion gamestate.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -98,14 +98,17 @@ function GS.registerEvents(callbacks)
end

-- forward any undefined functions
local function_cache = {}

setmetatable(GS, {__index = function(_, func)
-- call function only if at least one 'update' was called beforehand
-- (see issue #46)
if not state_is_dirty or func == 'update' then
state_is_dirty = false
return function(...)
function_cache[func] = function_cache[func] or function(...)
return (stack[#stack][func] or __NULL__)(stack[#stack], ...)
end
return function_cache[func]
end
return __NULL__
end})
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