c,cc/shared_ptr.cc


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

#include <iostream>
#include <memory>

using namespace std;

struct B {
  B(int i) : m(i) {}
  int m;
};

struct A {
  shared_ptr<B> b;
};

int
main(void)
{
  shared_ptr<B> x(new B(42));
  A* a = new A;
  A* c = new A;
  a->b = x;
  c->b = x;
  cout << x.use_count() << endl;
  delete a;
  cout << x.use_count() << endl;
  delete c;
  cout << x.use_count() << endl;

  return 0;
}