C + + constant function modify data member one question

1, problem description

There are classes as follows

class a_class{    voidconst    {        ...    }};

In this case, what if you want to modify the member variables of the class?

2, analysis

In C + +, when a class's data member is mutable , it is modified to be a const member function.

3, examples are as follows

Test class header file, Asa.h

#ifndef asa_h #define Asa_hclass  asa{public:    Asa ();     int Const ; Private :     int mobi;}; #endif // asa_h

Test class implementation body, Asa.cpp

" asa.h " Asa::asa () {    this0;} int Const {    return + +mobi;}

Call Main.cpp for the main class

#include <iostream>"asa.h"usingnamespace  std; int Main () {    new  Asa ();     << p->incr () << Endl;     return 0 ;}

C + + constant function modify data member one question