40 lines
1.4 KiB
Lua
40 lines
1.4 KiB
Lua
Instantiatable_class = {
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instance = false,
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__no_copy = true
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}
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--not that construction change is NOT called for inheriting an object.
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function Instantiatable_class:inherit(def)
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--construction chain for inheritance
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--if not def then def = {} else def = table.shallow_copy(def) end
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def.parent_class = self
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def.instance = false
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def.__no_copy = true
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def._construct_low = def.construct
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--this effectively creates a construction chain by overwriting .construct
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function def.construct(parameters)
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--rawget because in a instance it may only be present in a hierarchy but not the table itself
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if rawget(def, "_construct_low") then
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def._construct_low(parameters)
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end
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if self.construct then
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self.construct(parameters)
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end
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end
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def.construct(def)
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--iterate through table properties
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setmetatable(def, {__index = self})
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return def
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end
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function Instantiatable_class:new(def)
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--if not def then def = {} else def = table.shallow_copy(def) end
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def.base_class = self
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def.instance = true
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def.__no_copy = true
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function def:inherit(def)
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assert(false, "cannot inherit instantiated object")
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end
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setmetatable(def, {__index = self})
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--call the construct chain for inherited objects, also important this is called after meta changes
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self.construct(def)
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return def
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end |