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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Inheritance-Single/Lua/inheritance-single.lua Normal file
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Class = {
classname = "Class aka Object aka Root-Of-Tree",
new = function(s,t)
s.__index = s
local instance = setmetatable(t or {}, s)
instance.parent = s
return instance
end
}
Animal = Class:new{classname="Animal", speak=function(s) return s.voice or "("..s.classname.." has no voice)" end }
Cat = Animal:new{classname="Cat", voice="meow"}
Dog = Animal:new{classname="Dog", voice="woof"}
Lab = Dog:new{classname="Lab", voice="bark"}
Collie = Dog:new{classname="Collie"} -- subclass without a unique voice
print("Animal:speak(): " .. Animal:speak())
print("Cat:speak(): " .. Cat:speak())
print("Dog:speak(): " .. Dog:speak())
print("Lab:speak(): " .. Lab:speak())
print("Collie:speak(): " .. Collie:speak())
max = Collie:new{voice="Hi, I am Max the talking Collie!"} -- instance with a unique voice
print("max:speak(): " .. max:speak())
print("max himself is (instance): " .. max.classname)
print("max's parent is (class): " .. max.parent.classname)
print("max's parent's parent is (class): " .. max.parent.parent.classname)
print("max's parent's parent's parent is (class): " .. max.parent.parent.parent.classname)
print("max's parent's parent's parent's parent is (class): " .. max.parent.parent.parent.parent.classname)
print("max's parent's parent's parent's parent's parent is (nil reference): " .. tostring(max.parent.parent.parent.parent.parent))