文件名称:const
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当不想从外部调用成员函数修改成员变量时，可以将其被调成员函数加上const每个成员函数都有个隐式 this 指针，指向调用对象
-When do not want to call from outside a member function to modify a member variable, it can be coupled with const member functions be transferred functions of each member has one implicit this pointer, point to call the object
-When do not want to call from outside a member function to modify a member variable, it can be coupled with const member functions be transferred functions of each member has one implicit this pointer, point to call the object
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const.txt