oop system from luvit

luvit_oop.lua

-- OOP system from luvit
local Object = {}
Object.meta = {__index = Object}

function Object:create()
  local meta = rawget(self, "meta")
  if not meta then error("Cannot inherit from instance object") end
  return setmetatable({}, meta)
end

function Object:new(...)
  local obj = self:create()
  if type(obj.initialize) == "function" then
    obj:initialize(...)
  end
  return obj
end
function Object:extend()
  local obj = self:create()
  obj.meta = {__index = obj}
  return obj
end

-- example/benchmark follows.
local Rectangle = Object:extend()
local Square = Rectangle:extend()
local Square2 = Square:extend()
local Square3 = Square2:extend()
local Square4 = Square3:extend()
local Square5 = Square4:extend()
local Square6 = Square5:extend()

local st = os.clock()
for i=1,100000 do
  local s = Square6:new(1)
end
local et = os.clock()
print("t:", (et-st))