#include <iostream>
using std::cout;
using std::endl;

class box
{
public:
    box() : val(0), typ(0) {}
    void print() const
    {
        cout << "I am a box with val " << val << " and typ " << typ << endl;
    }
    mutable int val;
    int typ;
};

int main(int argc, char** argv)
{
    const box bx;

    bx.print();

    bx.val = 2;

    // wont compile because bx is const
    // bx.typ = 3;

    bx.print();

    return 0;
}