When does a deep copy happen to a QList?

Question

In a class I\'m working on, I am juggling several QLists. I have heard that Qt tries not to make deep copies of lists whenever possible. From what I understan

Answer 1

When you pass a QList as a argument of a function or when you create copies without modifying it Qt just pass a "wrapper", the real data is never copied along. Implicit sharing is the Qt implementation of the Flyweight pattern, see here.