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Iterators provide a uniform means to access items in a container.
Qt's container classes provide two types of iterators: Java-style
- iterators and STL-style iterators.
+ iterators and STL-style iterators. Iterators of both types are
+ invalidated when the data in the container is modified or detached
+ from \l{Implicit Sharing}{implicitly shared copies} due to a call
+ to a non-const member function.
\section2 Java-Style Iterators