https://www.geeksforgeeks.org/difference-between-dir-and-vars-in-python/ vars(node) 只返回当前节点属性 dir(node) 不仅仅返回当前节点属性,还返回node节点的所有父亲节点的属性。 dir() Function: This function displays more attributes than vars() function, as it is not limited to an instance. It...
The constructors of inherited classes are called in the same order in which they are inherited. For example, in the following program, B’s constructor is called before A’s constructor. 1#include<iostream>2usingnamespacestd;34classA5{6public:7A()8{9cout <<"A's constructor called"<<endl...
Technically, a child class inherits everything from its parent class, but those members defined in the parent class with private visibility will not be visible to the child class. 6. As we shall see later, a reference variable does not always need to be associated with a type ofclass, but...