Spec clarification regarding metamethods #6
Description
Can you clarify the meaning of this line in the spec:
It SHOULD NOT set any special functions, like metamethods
I don't know if my implementation violates this, since I use __call to instantiate my classes. Here is my class micro-library, base.lua:
return {
extend = function (self, subtype)
return setmetatable(subtype or {}, {
__index = self,
__call = function (self, ...)
local instance = setmetatable({}, { __index = self })
return instance, instance:constructor(...)
end
})
end,
constructor = function () end
}
And here is my class commons implementation:
if _G.common_class == false then return end
local Base = require 'base'
_G.common = {
class = function (name, class, superclass)
local c = Base.extend(superclass or Base, class)
c.constructor = class.init
return c
end,
instance = function (class, ...)
return (class(...))
end
}
This passes all the tests, but I worry that the __call metamethods on returned classes violate the spec. Am I misunderstanding the spec, or do I need to wrap my returned classes in an extra table or do something else in order not to violate the spec?