(C++) shared_ptr

 

#include <tr1/memory>
#include <cstdio>
using namespace std;
using namespace std::tr1;

 

int main() {
  shared_ptr<int> a(new int(3));
  shared_ptr<int> b;

 

  printf("%d %d\n", *a, a.use_count());
  //printf("%d\n", *b); // seg fault
}