#include <iostream>
#include <vector>

struct Point {
    int x;
    int& xref = x;
};

void printPoints(std::vector<Point>& vec) {
    for (int i = 0; i < vec.size(); i++) {
        printf("%d: %d %s %d\n", i, vec[i].x, vec[i].x == vec[i].xref ? "==" : "!=", vec[i].xref);
    }
    printf("\n");
}

int main() {
    std::vector<Point> points;
    for (int i = 0; i < 4; i++) {
        Point p;
        p.x = i;
        points.push_back(p);
        // assert (points[0].x == points[0].xref);
        printf("After iteration %d:\n", i);
        printPoints(points);
    }

    return 0;
}



/* OUTPUT:
After iteration 0:
0 == 0

After iteration 1:
0 != 1
1 == 1

After iteration 2:
0 != 2
1 != 2
2 == 2

After iteration 3:
0 != 3
1 != 3
2 != 3
3 == 3
*/