单例模式

c、c++ 写法

头文件 在 public中 加入  static Data* getInstance();

static Data* instance_ = NULL;Data* IMData::getInstance(){if (!instance_) {instance_ = new Data;}return instance_;}

lua 写法

GameData  = {}function GameData:new(o)    o = o or {}    setmetatable(o,self)    self.__index = self    return oendfunction GameData:getInstance()    if self.instance == nil then    self.instance = self:new()    end    return self.instanceend