# qdeleteall Finds places where a call to `qDeleteAll()` has a redundant `values()` or `keys()` call. Those calls create a temporary `QList<int>` and allocate memory. #### Example QSet<Cookies> set; // BAD: Unneeded container iteration and memory allocation to construct list of values qDeleteAll(set.values()); // GOOD: Unneeded container iteration and memory allocation to construct list of values qDeleteAll(set); #### Pitfalls Very rarely you might be deleting a list of `QObject`s who's `destroyed()` signal is connected to some code that modifies the original container. In the case of this contrived example iterating over the container copy is safer.
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