You may want to read up on Pointers.
http://www.tek-tips.com/faqs.cfm?fid=2914
Using pointers in Qt is no different to using them in pure C++.

On a side note QList is a template Class so you need to specify what You want it to contain. For example the declaration for a list of doubles would look something like this:
Qt Code: 
  1. QList<double> myList;
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