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Delaunay triangulation - edge flip?

I used this code: for Delaunay triangulation, now I'm trying to figure out how to flip edges like this:

I found that there is a member function of subdiv2d called "swapedges" which potentionally does exactly what I need but I don't know how it's supposed to be used, I'm pretty new at C++ and OpenCV and if there's anyone who could help me by showing an example of how it should work, I would be very thankful.

Thanks in advance.