As discussed in Chapter 3, Designing Your Application with Qt Designer, you should really get in the habit of using Qt's parent-child relationship when managing the memory for the classes based on
QObject in your application to avoid memory leaks. In my time of writing Qt applications, the only time I've had to deal with memory leaks was when I didn't use memory management based on
QObject. In addition, using classes such as
QSharedPointer for pointers that aren't based on
QObject is a good idea too.
Sometimes, though, you might introduce a memory leak that you can't find on your own. In that case, a tool such as Valgrind can be a lifesaver; it tracks every memory allocation and free operation in your application, ...