title: Is int guaranteed to be 32 bits on each platform supported by Qt, or only qint32?
body: <p>I remember reading somewhere that Qt guarantees the size of some data types on supported platforms. Is it that <code>int</code> will be <em>at least</em> 32 bits everywhere, and <code>qint32</code> will be <em>exactly</em> 32 bits everywhere? Or something else?</p>
  
  <p>C++ guarantees that <code>int</code> will be at least 16 bits, and some Qt structures like <code>QRect</code> and <code>QPoint</code> use <code>int</code> internally. I'm developing an application where 32 bits is needed with those types, and I don't want to have to duplicate their functionality so I can use a larger type.</p>