An Array of Pointers: Copies vs Addresses

1#include <iostream>
2using namespace std;
3 
4struct Item {
5    int qty;
6};
7 
8class Copies {
9    Item** m_items;
10    int m_count;
11public:
12    Copies(Item* src[], int n) : m_count(n) {
13        m_items = new Item*[n];
14        for (int i = 0; i < n; i++) {
15            m_items[i] = new Item(*src[i]);
16        }
17    }
18    ~Copies() {
19        for (int i = 0; i < m_count; i++) {
20            delete m_items[i];
21        }
22        delete[] m_items;
23    }
24    int total() const {
25        int sum = 0;
26        for (int i = 0; i < m_count; i++) {
27            sum += m_items[i]->qty;
28        }
29        return sum;
30    }
31};
32 
33class Refs {
34    Item** m_items;
35    int m_count;
36public:
37    Refs(Item* src[], int n) : m_count(n) {
38        m_items = new Item*[n];
39        for (int i = 0; i < n; i++) {
40            m_items[i] = src[i];
41        }
42    }
43    ~Refs() { delete[] m_items; }
44    int total() const {
45        int sum = 0;
46        for (int i = 0; i < m_count; i++) {
47            sum += m_items[i]->qty;
48        }
49        return sum;
50    }
51};
52 
53int main() {
54    Item a{1}, b{2}, c{3};
55    Item* list[] = {&a, &b, &c};
56    Copies copies(list, 3);
57    Refs refs(list, 3);
58    cout << copies.total() << " " << refs.total() << endl;
59    a.qty = 10;
60    c.qty = 0;
61    cout << copies.total() << " " << refs.total() << endl;
62    return 0;
63}