What is the function of C++ base class
This article mainly explains "what is the role of C++ base class", 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 "what is the role of the C++ base class"?
Private inheritance: public members in the base class are private in the derived class; protected members in the C++ base class are private in the derived class; and private members in the base class are not visible in the derived class, only the base class is visible. Protect inheritance: public members in the base class are protected in the derived class
Protected members in the C++ base class are protected in the derived class; private members in the base class are not visible in the derived class, only the C++ base class is visible. Through the inheritance mechanism, the derived class inherits the members of the base class, and the inherited members only belong to the derived class. That is, it is important that the base class and the derived class each have one such member. Next, let's not panic about inheritance, let's go back to the class: (personal understanding of the so-called visibility is to invoke permissions! )
Next, instead of looking at inheritance, let's go back to the class:
# include "iostream" using namespace std; class A {public: void dump () const {....} protected: void get_x () {Xerox;} private: int x;}; class B:public A {public: void get () {get_x ();} / * void get_y () {yardx;} * / void compare (A & a) {a.get_x ();} protected: void set () {...} private: int y }; int main () {
So we know that members that are not visible in derived classes are not inaccessible and can be accessed indirectly! Summarize the above and make a table: (note: the visibility of members in derived classes refers to inherited and self-added members.
Members
C++ base class (class)
Derived class
Main
Private data
Visible
Invisible
Invisible
Private function
Visible
Invisible
Invisible
Protect data
Visible
Visible
Invisible
Protection function
Visible
Visible
Invisible
Public data
Visible
Visible
Visible
Public function
Visible
Visible
Visible
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