问题
Generally speaking, what is the correct way to deep copy Qt containers? I'm not worried about deep copying the containers recursively, although addressing such would be helpful.
回答1:
Despite what everyone will tell you - that you don't deep copy Qt containers - there are situations in which you simply need to perform an actual deep copy instead of just a shallow one. To do that, use detach():
container1 = container2;
container1.detach();
来源：https://stackoverflow.com/questions/16800206/how-to-deep-copy-qmap-and-other-qt-containers