function as parameter lua - function

Question

following problem is mine:
i want to have a function that create a new object in lua, but it should be possible to extend it.
function Class(table)
local a = {}
local t = {create = _create, __newindex = function(o,k,v)
if k == "create" then
--getmetatable(o).create = function()
--_create(o)
--v()
--end
-- or just create(v.params)
else
rawset(o,k,v)
end
end,
}
setmetatable(a,t)
t.__index = t
end
function _create(o,...)
return newTable
end
ele = Class:create()
function Class:create( n )
self.name = n
end
ele2 = Class:create("bbbb")
now the ele2 is without a name, but it schould be create a new object with the given string as name.
can i get the parameter of given value(type function) from newindex or can i execute the value?

Answer 1

There are a few things I'm not sure about. As Etan said, what is newTable and why are you trying to set create as a function of Class when Class is a function?
If you're looking for a way to init an instance of a class when it is created, you can do something like this:
function Class()
local class = {}
class.__index = class
return setmetatable(class, {__call = function(...)
local instance = setmetatable({}, class)
if instance.init then
instance:init(select(2, ...))
end
return instance
end})
end
--now an example:
Dog = Class()
function Dog:init(name)
self.name = name
end
function Dog:bark()
print(string.format("%s barked!", self.name))
end
local pedro = Dog("Pedro")
pedro:bark() --> pedro barked!