It’s not my work. It’s from @spalx:
Unfortunately he’s not active anymore since 2013.
I assume merging the extension into the newer versions of cocos2d-x would not be a problem. The question is tho, if the design is still appropriate, as the recognizer class is derived from Layer.
The touch system changed a lot since the introduction of 3.x, so there might be a better approach now, e.g. without deriving from Layer, dropping virtual functions, using delegates and so on.
Besides that, tehre is also a 3.x version of it:
What’s the approach/design with your implementation?
It is, besides from learning, but that’s the problem with code/extensions/contributions scatter around the internet, of which GR is just one example.