Class BindStateBase

src/include/base/internal/cef_callback_internal.h:59–78

At the base level, the only task is to add reference counting data. Don't use RefCountedThreadSafe since it requires the destructor to be a virtual method. Creating a vtable for every BindState template instantiation results in a lot of bloat. Its only task is to call the destructor which can be done with a function pointer.

// of bloat. Its only task is to call the destructor which can be done with a
// function pointer.
class BindStateBase {
 protected:
  explicit BindStateBase(void (*destructor)(BindStateBase*))
      : ref_count_(0), destructor_(destructor) {}
  ~BindStateBase() {}

 private:
  friend class scoped_refptr<BindStateBase>;
  friend class CallbackBase;

  void AddRef();
  void Release();

  AtomicRefCount ref_count_;

  // Pointer to a function that will properly destroy |this|.
  void (*destructor_)(BindStateBase*);

  DISALLOW_COPY_AND_ASSIGN(BindStateBase);
};

// Holds the Callback methods that don't require specialization to reduce
// template bloat.