C ++ Summary-object-oriented

C ++ is often regarded as "C with Class". In fact, C ++ introduces a complete object-oriented idea and adds many basic structures to support this idea.

 

Class and struct

Classes and struct in C ++ are very similar.

 

C ++ inheritance

C ++ does not have the interface keyword, but has the interface idea. In fact, a pure virtual function is an interface. Because there is no interface concept, C ++ does not implement (implements). It has only inheritance. Unlike Java, C ++ supports multi-inheritance. C ++ can be inherited in two ways: single inheritance and multi-inheritance. For single inheritance, the derived class has only one base class. For multi-inheritance, A derived class is generally derived from multiple base classes. The format is:

Single inheritance format: class derived class name: Inheritance Method Base class Name

Multi-inheritance format: class derived class name: Inheritance Method 1 base class name 1 ,......, Inheritance Method n base class name n

 

Apart from single inheritance and multi-inheritance, C ++ inherits public inheritance, protected inheritance, and private inheritance. See the following table:

Access attribute of a derived class member

Access attributes of base class members

Inheritance Method

Public

Protected

Private

Public

Public

Protected

Private

Protected

Protected

Protected

Private

Private

Hide in a derived class

Hide in a derived class

Hide in a derived class

 

In addition, the concept of virtual inheritance exists in C ++:

Class derived class name: base class name in virtual inheritance mode