代理模式

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单例模式

单例模式
将构造和析构函数设为私有
将拷贝构造设为私有化
使用静态函数在类内new
不想用用全局变量—–》单例模式
单例是共享数据,取代全局,行之有效的方法—-》可以再没次使用时new,但new出来的是同一个

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