51 struct shared_ptr  struct
53   using element_type = T;
55   using v = vtable<T>;
57   explicit shared_ptr (T *p = nullptr) : p (p) {}  in shared_ptr()  function
58   shared_ptr (const shared_ptr &o) : p (v::reference (o.p)) {}  in shared_ptr()  argument
59   shared_ptr (shared_ptr &&o) : p (o.p) { o.p = nullptr; }  in shared_ptr()  argument
60 …ator = (const shared_ptr &o) { if (p != o.p) { destroy (); p = o.p; reference (); } return *this; }  in operator =()
61   shared_ptr& operator = (shared_ptr &&o) { v::destroy (p); p = o.p; o.p = nullptr; return *this; }  in operator =()
62   ~shared_ptr () { v::destroy (p); p = nullptr; }  in ~shared_ptr()
64   T* get() const { return p; }  in get()
66   void swap (shared_ptr &o) { std::swap (p, o.p); }  in swap()
69   operator T * () const { return p; }  in operator T*()
70   T& operator * () const { return *get (); }  in operator *()
71   T* operator -> () const { return get (); }  in operator ->()
72   operator bool () const { return p; }  in operator bool()
73   bool operator == (const shared_ptr &o) const { return p == o.p; }  in operator ==()
74   bool operator != (const shared_ptr &o) const { return p != o.p; }  in operator !=()
76   static T* get_empty() { return v::get_empty (); }  in get_empty()
77   T* reference() { return v::reference (p); }  in reference()
78   void destroy() { v::destroy (p); }  in destroy()
79   void set_user_data (hb_user_data_key_t *key,  in set_user_data()
83   void * get_user_data (hb_user_data_key_t *key) { return v::get_user_data (p, key); }  in get_user_data()
86   T *p;