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@ruisongzhou c++11中auto_ptr已经被舍弃了
@ruisongzhou 然鹅我太菜了
所以是不是可以理解为 只有当类A继承或含有一个有构造函数的类B的时候,才会自动生成构造函数
与 Dian 的连接断开,我们正在尝试重连,请耐心等待