Chaining .__index in metatables

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#1

Continuing the discussion from What does .__index do?:

So I am currently learning OOP, and in the last reply of the above post, the commenter shows an example of chaining .__index commands together. I was wondering how it would look in an alternate format (the one used in this All about Object Oriented Programming)

ClassA = {}
ClassA.__index = ClassA

function ClassA.new()
    local ClassB = {}
    ClassB.__index = ClassB
    setmetatable(ClassB, ClassA)

    function ClassB.new()
        local ClassC = {}
        setmetatable(ClassC, Class
    end
end

Is this how chaining .__index would look in one script?

From what I understand: Basically ClassC’s .__index is ClassB, which ClassB’s .__index is ClassA. So if I called a function in ClassC that doesn’t exist via the metatable it will check ClassB for the function using .__index, and then via ClassB’s metatable it will check ClassA using .__index.