EnableIf 38 mojo/public/cpp/bindings/lib/callback_internal.h struct EnableIf<true, T> { typedef T type; }; EnableIf 41 mojo/public/cpp/bindings/lib/callback_internal.h typename EnableIf<!Callback_ParamTraits<T>::kIsScopedHandle, T>::type& EnableIf 47 mojo/public/cpp/bindings/lib/callback_internal.h typename EnableIf<Callback_ParamTraits<T>::kIsScopedHandle, T>::type