8/5/2012

  1 #include <iostream>
  2 #include <memory>
  3
  4 using namespace std;
  5
  6 template <class T>
  7 ostream& operator<<(ostream& strm, const auto_ptr<T>& p) {
  8     // does p own a object?
  9     if(p.get() == NULL) {
 10         strm << "NULL";
 11     } else {
 12         strm << *p;
 13     }
 14     return strm;
 15 }
 16
 17 int main() {
 18     auto_ptr<int> p(new int(42));
 19     auto_ptr<int> q;
 20
 21     cout << "after initialization: " << endl;
 22     cout << "p: " << p << endl;
 23     cout << "q: " << q << endl;
 24
 25     q = p;
 26     cout << "after assigning auto pointers" << endl;
 27     cout << "p: " << p << endl;
 28     cout << "q: " << q << endl;
 29
 30     *q += 13;
 31     p = q;
 32     cout << "after change and reassignment" << endl;
 33     cout << "p: " << p << endl;
 34     cout << "q: " << q << endl;
 35
 36     return 0;
 37 }