Conditional summary of access control for C++ class

2020-05-19 05:16:10
OfStack

Summary of conditions for access control of C++ class

Recently, when I was using C++ to create a class, I suddenly found that I didn't fully understand the functions of class access control public, protected and private. Later, I looked up some information, which is recorded here.

Access control

The important properties of the C++ class are encapsulation and inheritance. Therefore, the most critical issue is the issue of access. public, protected and private control access rights.

      public
      protected
      private
    
      类成员是否可以访问
      Yes
      Yes
      Yes
    
      友元函数是否可以访问
      Yes
      Yes
      Yes
    
      子类是否可以访问
      Yes
      Yes
      No
    
      类的实例化对象是否可以访问
      Yes
      No
      No
    
inheritance

Permission changes caused by three inheritance methods:

      public
      protected
      private
    
      public继承
      public
      protected
      private
    
      protected继承
      protected
      protected
      private
    
      private继承
      private
      private
      private
    
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	public	protected	private
类成员是否可以访问	Yes	Yes	Yes
友元函数是否可以访问	Yes	Yes	Yes
子类是否可以访问	Yes	Yes	No
类的实例化对象是否可以访问	Yes	No	No

	public	protected	private
public继承	public	protected	private
protected继承	protected	protected	private
private继承	private	private	private