Non-static member XXX found in multiple base-class - What can I do?

cocos2d-x C++
#1

Hello, who of you can give me fingertip ?

at my h.file I "need "his
class _mainWorld : public lWorldMainScene, public cocos2d::ui::ScrollView{

but after including “public cocos2d::ui::ScrollView” I got his errors at the cpp-files…

ERRORS:

_Non-static member 'autorelease' found in multiple base-class subobjects of type 'cocos2d::Ref':_
_class _mainWorld -> class WorldMainScene -> class LHScene -> cocos2d::Scene -> class cocos2d::Node -> class cocos2d::Ref_

_class _mainWorld -> cocos2d::ui::ScrollView -> class cocos2d::ui::Layout -> class cocos2d::ui::Widget -> class cocos2d::ProtectedNode -> class cocos2d::Node -> class cocos2d::Ref_
#2

This is the common ‘Diamond Inheritance’ problem. Essentially both xxxxScene(S) and ScrollView(SV) both inherit from Ref. see: http://www.cprogramming.com/tutorial/virtual_inheritance.html

Personally, I’d rethink your design. Try to move your concepts into data where possible instead so that you can have them as members instead of inheritance (google “has-a” vs “is-a”).

class world : scene {
   scrollview * sv;
}
1 Like
#3

I will check that… THX

#4

You can make virtual inheritance from a base class[es] in your code and in cocos2dx sources. Edit cocos2dx engine sources is OK, if you know what are you doing.

#5

Do not edit the Game Engine code. It becomes more difficult to upgrade the version of Cocos2DX in the future.

#6