Lua实现类继承

mulinherit.lua

--[[
author:[e-mail]
date:2014/7/18
purpose:lua的继承演示
--]]
--- base class "object"
local object = {_t = "object"}
function object:new(id)
    local o =
    {
        _id = id
    }
    setmetatable(o, self)
    self.__index = self
    return o
end
function object:type()
    return self._t
end
function object:id()
    return self._id
end
--- class "widget" driver from "object"
local widget = {_t = "widget"}
setmetatable(widget, object)
function widget:new(id)
    local o =
    {
        _id = id,
    }
    setmetatable(o, self)
    self.__index = self
    -- function (tb, key)
    --  return self[key]
    -- end
    return o
end
-- function widget:id()
--  return self._id
-- end
--- class "drawor" driver from "object"
local drawor = {_t = "drawor"}
setmetatable(drawor, object)
function drawor:new(id, name)
    local o =
    {
        _id = id,
        _name = name,
    }
    setmetatable(o, self)
    self.__index = self
    return o
end
function drawor:name()
    return self._name
end
--- class "drawplane" driver from "widget" and "drawor"
local drawplane = {_t = "drawplane", _father = {widget, drawor}}
function drawplane:new(id)
    local o =
    {
        _id = id,
    }
    setmetatable(o, self)
    self.__index =
    function (tb, key)
        if self[key] then return self[key] end
        for _, v in pairs(self._father) do
            if v._t == key then return v end
            if v[key] then return v[key] end
        end
    end
    return o
end
local vara = object:new()
local varb = widget:new(10)
local varc = drawor:new(30, "dwr")
local vard = drawplane:new(51)
print("vara type:", vara:type())
print("varb type:", varb:type())
print("varb._id: ", varb._id, varb:id())
print("varc name: ", varc:name())
print("vard type: ", vard:type())
print("vard id: ", vard:id())
print("vard father widget--", vard.widget:type())

以上就是本文所要分享的代码了，希望大家能够喜欢。