Weak Pointers
By Pete Becker, November 01, 2005
Sometimes, an application needs a pointer that doesn't affect the lifetime of the resource it points to. TR1 provides a weak_ptr for this purpose.
November, 2005: Weak Pointers
Listing 2
// synopsis of template class weak_ptr
template <class Ty> class weak_ptr {
public:
typedef Ty element_type;
weak_ptr();
weak_ptr(const weak_ptr& wp);
template<class Other>
weak_ptr(const weak_ptr<Other>& wp);
template<class Other>
weak_ptr(const shared_ptr<Other>& sp);
weak_ptr& operator=(const weak_ptr& sp);
template<class Other>
weak_ptr& operator=(const weak_ptr<Other>& sp);
template<class Other>
weak_ptr& operator=(const shared_ptr<Other>& ap);
void swap(weak_ptr& sp);
void reset();
long use_count() const;
bool expired() const;
shared_ptr<Ty> lock() const;
};
