48 struct shared_ptr  struct
50   using element_type = T;
52   using v = vtable<T>;
54   explicit shared_ptr (T *p = nullptr) : p (p) {}  in shared_ptr()  function
55   shared_ptr (const shared_ptr &o) : p (v::reference (o.p)) {}  in shared_ptr()  argument
56   shared_ptr (shared_ptr &&o)  noexcept : p (o.p) { o.p = nullptr; }  in shared_ptr()  argument
57 …ator = (const shared_ptr &o) { if (p != o.p) { destroy (); p = o.p; reference (); } return *this; }  in operator =()
58 …tr& operator = (shared_ptr &&o)  noexcept { v::destroy (p); p = o.p; o.p = nullptr; return *this; }  in operator =()
59   ~shared_ptr () { v::destroy (p); p = nullptr; }  in ~shared_ptr()
61   T* get() const { return p; }  in get()
63   void swap (shared_ptr &o)  noexcept { std::swap (p, o.p); }  in swap()
66   operator T * () const { return p; }  in operator T*()
67   T& operator * () const { return *get (); }  in operator *()
68   T* operator -> () const { return get (); }  in operator ->()
69   operator bool () const { return p; }  in operator bool()
70   bool operator == (const shared_ptr &o) const { return p == o.p; }  in operator ==()
71   bool operator != (const shared_ptr &o) const { return p != o.p; }  in operator !=()
73   static T* get_empty() { return v::get_empty (); }  in get_empty()
74   T* reference() { return v::reference (p); }  in reference()
75   void destroy() { v::destroy (p); }  in destroy()
76   void set_user_data (hb_user_data_key_t *key,  in set_user_data()
80   void * get_user_data (hb_user_data_key_t *key) { return v::get_user_data (p, key); }  in get_user_data()
83   T *p;