Copy or Address?

1#include <iostream>
2using namespace std;
3 
4struct Box {
5    int weight;
6};
7 
8class Crate {
9    Box* m_box;
10public:
11    Crate(const Box& box) { m_box = new Box(box); }
12    ~Crate() { delete m_box; }
13    int weight() const { return m_box->weight; }
14};
15 
16class Manifest {
17    const Box* m_box;
18public:
19    Manifest(const Box& box) { m_box = &box; }
20    int weight() const { return m_box->weight; }
21};
22 
23int main() {
24    Box parcel{10};
25    Crate crate(parcel);
26    Manifest manifest(parcel);
27    parcel.weight = 25;
28    cout << crate.weight() << " " << manifest.weight() << endl;
29 
30    Box other{40};
31    Manifest second(other);
32    other.weight += 2;
33    cout << second.weight() << " " << crate.weight() << endl;
34    return 0;
35}