Shulou(Shulou.com)05/31 Report--

This article mainly explains "how to apply C++ inheritance". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn how to apply C++ inheritance.

The inheritance of the class will first look for the base class. If the base class is not implemented, it will look for the function of the derived class.

1. Class inherits, but functions do not inherit.

# include class Base {public: Base () {} ~ Base () {} int a; void setA () {a = 1;}}; class A:public Base {public: a () {} ~ A () {} void setA () {a = 2;}}; class B:public Base {public: B () {} ~ B () {} void setA () {a = 3;}} Int main () {A * ax = new A (); B * bx = new B (); Base * aClass = ax; Base * bClass = bx; aClass- > setA (); bClass- > setA (); printf ("a value of a% d\ n", aClass- > a); printf ("a value of b% d\ n", bClass- > a); return 0;}

two。 Both function and Class inherit

# include class Base {public: Base () {} ~ Base () {} int a; virtual void setA () {a = 1;}}; class A:public Base {public: a () {} ~ A () {} virtual void setA () {a = 2;}}; class B:public Base {public: B () {} ~ B () {} virtual void setA () {a = 3;}} Int main () {A * ax = new A (); B * bx = new B (); Base * aClass = ax; Base * bClass = bx; aClass- > setA (); bClass- > setA (); printf ("a value of a% d\ n", aClass- > a); printf ("a value of b% d\ n", bClass- > a); return 0;}

Run result: note that virtual can not be written in the derived class. It is best to write it to identify function inheritance.

If the function of the base class in 2 is written as a pure virtual function, the result is the same, but if the base class is a pure virtual function, the derived class must implement the corresponding function.

Class Base {public: Base () {} ~ Base () {} int a; virtual void setA () = 0;}

3. If there is no function in class A, it inherits from the base class

Class A:public Base {public: a () {} ~ A () {}}; at this point, I believe you have a deeper understanding of "how to apply C++ inheritance". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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