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function class(super)
	local mt = {__call = function(_c, ...)
        local function create(_c, _o, ...)
			if _c.__super then create(_c.__super, _o, ...) end
			if _c.__ctor then _c.__ctor(_o, ...) end
			return _o
        end

		local _o = create(_c, {}, ...)
		return setmetatable(_o, _c)
	end}

	mt.__index = super or mt

	return setmetatable({__super = super}, mt)
end

----------------------------------------------------------------------


A = class()

function A:__ctor(s)
	self.i = 123
	self.j = 333
	print('A ctor', s)
end

local a = A('a')
print(a.i, a.j)

-- B继承A
B = class(A)

function B:__ctor(s)
	self.i = 444
	print('B ctor', s)
end

local b = B('b')
print(b.i, b.j)