Override Parant Object function but still able to call it?

Help and Feedback Scripting Support
#1

I new to lua OOP and wanted to ask is there a way to override a parents function but still be able to call it

Example:

local ParentObject = {}
ParentObject.__Index = ParentObject

function ParentObject.Print()
    print("this is the parent")
end

local ChildObject = {}
ChildObject.__Index = ChildObject
setmetatable(ChildObject, ParentObject)

function ChildObject.Print()
    self.ParentObjectPrint() -- Don't know how to do this
    print("this is the child")
end

so calling the functions will look like:

ParentObject.Print()
-- Prints 'this is the parent'

ChildObject.Print()
--Prints 'this is the parent' then prints 'this is the child' directly after
#2

Sort of find a way to do it by storing the function inside the child like this:

ChildObject.ParentObjectPrint = PararentObject.Print()

and I can call it but the problem it won’t accept any args, the args just become nil

#3

In this exact situation, you can call ParentObject.Print() directly.

But what you have here isn’t super standard OOP, these are fully static classes (i.e. there’s no instances or new).

#4

These were just example
It would more of this

local child = ChildObject.new() --just image I have a .new() function
child.Print() -- I would still want to print the parent function BUT 
                   -- the parent function self will now = to the child
#5

Can you come up with a fully working example except for that one line, just so we have common thing to look at? There are a lot of ways to do inheritance in lua so it would be helpful to know exactly how you’re doing it.

#6

You’ve indicated that you are having problems with the self variable.

To use self you have to use the self-iterator. To do this, you’ll need to make it a namecall method with a colon instead of a period.

local foo = {}

function foo:bar(...)
	print(type(self.bar))
end

function foo.bar(self, ...)
	print(type(self.bar))
end

return foo

Both functions are not the same in syntax but they behave exactly the same…

#7

Basically I have and update function in the Parent object that updates all the back end stuff like healthGui, ammoGui, etc. I also want this to update for the child but I want the child to update the back end stuff. I am currently getting around this but creating a serperate function called base_update that the child will never overried and just call base_update from child update