03. Logic constness (mutable

#include <iostream>
#include <vector>

using namespace std;

 // If the logic const is the goal, use mutable members to implement

class BigArray
{
    vector<int> v;
    //mutable int   accessCounter; // first way.
    int accessCounter;

public:
    int getItem(int index) const
    {
        //accessCounter++; // first way
        const_cast<BigArray*>(this)->accessCounter++; // Note: The casting is hacking way of coding, use it only when it had to.
        return v[index];
    }
};


int main()
{
    // 1. The first way to change variable in const function is to declare the variable with the keyword mutable.
    // 2. The second is to cast the variable
}