22 class CallbackBase;  variable
67   friend class CallbackBase;  variable
96 class BASE_EXPORT CallbackBase {
98   inline CallbackBase(CallbackBase&& c) noexcept;
99   CallbackBase& operator=(CallbackBase&& c) noexcept;
101   explicit CallbackBase(const CallbackBaseCopyable& c);
102   CallbackBase& operator=(const CallbackBaseCopyable& c);
104   explicit CallbackBase(CallbackBaseCopyable&& c) noexcept;
105   CallbackBase& operator=(CallbackBaseCopyable&& c) noexcept;
122   bool EqualsInternal(const CallbackBase& other) const;
124   constexpr inline CallbackBase();
128   explicit inline CallbackBase(BindStateBase* bind_state);
137   ~CallbackBase();
142 constexpr CallbackBase::CallbackBase() = default;
143 CallbackBase::CallbackBase(CallbackBase&&) noexcept = default;
144 CallbackBase::CallbackBase(BindStateBase* bind_state)  in CallbackBase()  function
148 class BASE_EXPORT CallbackBaseCopyable : public CallbackBase {
158       : CallbackBase(bind_state) {}  in CallbackBaseCopyable()