Why Does Calling a Class Method with a Null Pointer Sometimes Work?

Accessing Class Methods with Null Class Pointers

In the code snippet you provided, you have a class named ABC with a method called print(). You create an instance of the class using a pointer, but you assign it a null value. Then, you attempt to call the print() method on the null pointer.

According to the provided answer, accessing member functions through a null pointer should result in undefined behavior. However, in your case, it appears to work without errors. Why is this happening?

The answer explains that in the print() method, the this pointer, which points to the current object, is not used. Since the this pointer is not directly accessed, the program can bypass the issue associated with null pointers.

In other words, the print() method can execute without referencing the object because it doesn't rely on the data members or methods of the object. It simply prints a string to the screen.

The above is the detailed content of Why Does Calling a Class Method with a Null Pointer Sometimes Work?. For more information, please follow other related articles on the PHP Chinese website!