Lua实现类继承

mulInherit.lua

--[[

author:looyer@sina.com

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。