Demonstrate mutable. : mutable « Language Basics « C++ Tutorial

1. C++ Tutorial
2. Language Basics
3. mutable

#include <iostream>
using namespace std;

class MyClass {
  mutable int i;
  int j;
public:
  int geti() const {
    return i; // ok
  }

  void seti(int x) const {
    i = x; // now, OK.
  }

/* The following function won't compile.
  void setj(int x) const {
    j = x; // Still Wrong!
  }
*/
};

int main()
{
  MyClass ob;

  ob.seti(1900);
  cout << ob.geti();

  return 0;
}

1900"