Name

weak_ptr: Class template stores a "weak reference" to an object that is already managed by a shared_ptr.

Synopsis

namespace boost {

  template<class T> class weak_ptr {

    public:
      typedef T element_type;

      weak_ptr();

      template<class Y> weak_ptr(shared_ptr<Y> const & r);
      weak_ptr(weak_ptr const & r);
      template<class Y> weak_ptr(weak_ptr<Y> const & r);

      ~weak_ptr();

      weak_ptr & operator=(weak_ptr const & r);
      template<class Y> weak_ptr & operator=(weak_ptr<Y> const & r);
      template<class Y> weak_ptr & operator=(shared_ptr<Y> const & r);

      long use_count() const;
      bool expired() const;
      shared_ptr<T> lock() const;

      void reset();
      void swap(weak_ptr<T> & b);
  };

  template<class T, class U>
    bool operator<(weak_ptr<T> const & a, weak_ptr<U> const & b);

  template<class T>
    void swap(weak_ptr<T> & a, weak_ptr<T> & b);
}

Detailed Description

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Limitation

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