I'm still rather new to both c++ and qt4, so please bear with me. My question is what exactly does the -> operator do? I've looked in both the Qt4 Tutorial and my copy of the C++ Primer, and I've yet to find anything on it.

Basically I wish to know why:
Qt Code: 
  1. myButton->setEnabled(!text.isEmtpy());
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differs from:
Qt Code: 
  1. myButton.setEnabled(!text.isEmpty());
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