Alter/Modify the values of data members of a class inside const member function - Functions

Discussion

• ramesh   -Posted on 08 Oct 15
  In general we cannot alter/modify the values of data members of a class inside const member function but if we declare data member as mutable then we can modify the data in cons function.
  Example:
  class CountDemo
  {
  int count;
  public:
  CountDemo()
  {
  count=0;
  }
  CountDemo(int c)
  {
  count=c;
  }
  void getCount() const
  {
  count++;
  cout << "\n count= " << count;
  }
  };
  void main()
  {
  CountDemo c(10);
  c.getCount();
  
  }
  
  The above program will give the compile time error because getCount() function is constant, but if you declare count data member as mutable then you can modify the count variable.
  

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