我很难在Lua学习课程.毫无结果的谷歌搜索让我了解了关于元表的想法,并暗示第三方库是模拟/编写类所必需的.
这是一个示例(仅仅因为我注意到在提供示例代码时我得到了更好的答案):
public class ElectronicDevice
{
protected bool _isOn;
public bool IsOn { get { return _isOn; } set { _isOn = value; } }
public void Reboot(){_isOn = false; ResetHardware();_isOn = true; }
}
public class Router : ElectronicDevice
{
}
public class Modem :ElectronicDevice
{
public void WarDialNeighborhood(string areaCode)
{
ElectronicDevice cisco = new Router();
cisco.Reboot();
Reboot();
if (_isOn)
StartDialing(areaCode);
}
}
这是我第一次尝试使用Javier建议的技术来翻译上述内容.
我接受了RBerteig的建议.但是,对派生类的调用仍然会产生:"attempt to call method 'methodName' (a nil value)"
--Everything is a table
ElectronicDevice = {};
--Magic happens
mt = {__index=ElectronicDevice};
--This must be a constructor
function ElectronicDeviceFactory ()
-- Seems that the metatable holds the fields
return setmetatable ({isOn=true}, mt)
end
-- Simulate properties with get/set functions
function ElectronicDevice:getIsOn() return self.isOn end
function ElectronicDevice:setIsOn(value) self.isOn = value end
function ElectronicDevice:Reboot() self.isOn = false;
self:ResetHardware(); self.isOn = true; end
function ElectronicDevice:ResetHardware() print('resetting hardware...') end
Router = {};
mt_for_router = {__index=Router}
--Router inherits from ElectronicDevice
Router = setmetatable({},{__index=ElectronicDevice});
--Constructor for subclass, not sure if metatable is supposed to be different
function RouterFactory ()
return setmetatable ({},mt_for_router)
end
Modem ={};
mt_for_modem = {__index=Modem}
--Modem inherits from ElectronicDevice
Modem = setmetatable({},{__index=ElectronicDevice});
--Constructor for subclass, not sure if metatable is supposed to be different
function ModemFactory ()
return setmetatable ({},mt_for_modem)
end
function Modem:WarDialNeighborhood(areaCode)
cisco = RouterFactory();
--polymorphism
cisco.Reboot(); --Call reboot on a router
self.Reboot(); --Call reboot on a modem
if (self.isOn) then self:StartDialing(areaCode) end;
end
function Modem:StartDialing(areaCode)
print('now dialing all numbers in ' .. areaCode);
end
testDevice = ElectronicDeviceFactory();
print("The device is on? " .. (testDevice:getIsOn() and "yes" or "no") );
testDevice:Reboot(); --Ok
testRouter = RouterFactory();
testRouter:ResetHardware(); -- nil value
testModem = ModemFactory();
testModem:StartDialing('123'); -- nil value
John Calsbee.. 8
这是代码的示例文字转录,有一个有用的Class库,可以移动到另一个文件.
这绝不是规范的实施Class; 随意定义您喜欢的对象模型.
Class = {}
function Class:new(super)
local class, metatable, properties = {}, {}, {}
class.metatable = metatable
class.properties = properties
function metatable:__index(key)
local prop = properties[key]
if prop then
return prop.get(self)
elseif class[key] ~= nil then
return class[key]
elseif super then
return super.metatable.__index(self, key)
else
return nil
end
end
function metatable:__newindex(key, value)
local prop = properties[key]
if prop then
return prop.set(self, value)
elseif super then
return super.metatable.__newindex(self, key, value)
else
rawset(self, key, value)
end
end
function class:new(...)
local obj = setmetatable({}, self.metatable)
if obj.__new then
obj:__new(...)
end
return obj
end
return class
end
ElectronicDevice = Class:new()
function ElectronicDevice:__new()
self.isOn = false
end
ElectronicDevice.properties.isOn = {}
function ElectronicDevice.properties.isOn:get()
return self._isOn
end
function ElectronicDevice.properties.isOn:set(value)
self._isOn = value
end
function ElectronicDevice:Reboot()
self._isOn = false
self:ResetHardware()
self._isOn = true
end
Router = Class:new(ElectronicDevice)
Modem = Class:new(ElectronicDevice)
function Modem:WarDialNeighborhood(areaCode)
local cisco = Router:new()
cisco:Reboot()
self:Reboot()
if self._isOn then
self:StartDialing(areaCode)
end
end
如果您坚持使用属性的get/set方法,则不需要__index和__newindex函数,并且可以只有一个__index表.在这种情况下,模拟继承的最简单方法是这样的:
BaseClass = {}
BaseClass.index = {}
BaseClass.metatable = {__index = BaseClass.index}
DerivedClass = {}
DerivedClass.index = setmetatable({}, {__index = BaseClass.index})
DerivedClass.metatable = {__index = DerivedClass.index}
换句话说,派生类的__index表"继承"基类的__index表.这是有效的,因为Lua在委托__index表时,会有效地重复查找,因此__index调用表的元方法.
此外,要警惕有关调用obj.Method(...)VS obj:Method(...).obj:Method(...)是语法糖obj.Method(obj, ...),混合两个调用可以产生不寻常的错误.
这是代码的示例文字转录,有一个有用的Class库,可以移动到另一个文件.
这绝不是规范的实施Class; 随意定义您喜欢的对象模型.
Class = {}
function Class:new(super)
local class, metatable, properties = {}, {}, {}
class.metatable = metatable
class.properties = properties
function metatable:__index(key)
local prop = properties[key]
if prop then
return prop.get(self)
elseif class[key] ~= nil then
return class[key]
elseif super then
return super.metatable.__index(self, key)
else
return nil
end
end
function metatable:__newindex(key, value)
local prop = properties[key]
if prop then
return prop.set(self, value)
elseif super then
return super.metatable.__newindex(self, key, value)
else
rawset(self, key, value)
end
end
function class:new(...)
local obj = setmetatable({}, self.metatable)
if obj.__new then
obj:__new(...)
end
return obj
end
return class
end
ElectronicDevice = Class:new()
function ElectronicDevice:__new()
self.isOn = false
end
ElectronicDevice.properties.isOn = {}
function ElectronicDevice.properties.isOn:get()
return self._isOn
end
function ElectronicDevice.properties.isOn:set(value)
self._isOn = value
end
function ElectronicDevice:Reboot()
self._isOn = false
self:ResetHardware()
self._isOn = true
end
Router = Class:new(ElectronicDevice)
Modem = Class:new(ElectronicDevice)
function Modem:WarDialNeighborhood(areaCode)
local cisco = Router:new()
cisco:Reboot()
self:Reboot()
if self._isOn then
self:StartDialing(areaCode)
end
end
如果您坚持使用属性的get/set方法,则不需要__index和__newindex函数,并且可以只有一个__index表.在这种情况下,模拟继承的最简单方法是这样的:
BaseClass = {}
BaseClass.index = {}
BaseClass.metatable = {__index = BaseClass.index}
DerivedClass = {}
DerivedClass.index = setmetatable({}, {__index = BaseClass.index})
DerivedClass.metatable = {__index = DerivedClass.index}
换句话说,派生类的__index表"继承"基类的__index表.这是有效的,因为Lua在委托__index表时,会有效地重复查找,因此__index调用表的元方法.
此外,要警惕有关调用obj.Method(...)VS obj:Method(...).obj:Method(...)是语法糖obj.Method(obj, ...),混合两个调用可以产生不寻常的错误.
有很多方法可以做到这一点,但这就是我做的事情(通过继承更新):
function newRGB(r, g, b)
local rgb={
red = r;
green = g;
blue = b;
setRed = function(self, r)
self.red = r;
end;
setGreen = function(self, g)
self.green= g;
end;
setBlue = function(self, b)
self.blue= b;
end;
show = function(self)
print("red=",self.red," blue=",self.blue," green=",self.green);
end;
}
return rgb;
end
purple = newRGB(128, 0, 128);
purple:show();
purple:setRed(180);
purple:show();
---// Does this count as inheritance?
function newNamedRGB(name, r, g, b)
local nrgb = newRGB(r, g, b);
nrgb.__index = nrgb; ---// who is self?
nrgb.setName = function(self, n)
self.name = n;
end;
nrgb.show = function(self)
print(name,": red=",self.red," blue=",self.blue," green=",self.green);
end;
return nrgb;
end
orange = newNamedRGB("orange", 180, 180, 0);
orange:show();
orange:setGreen(128);
orange:show();
虽然有可能,但我没有实现私有,受保护等.
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