Test your applications on Wayland

Adriaan de Groot groot at kde.org
Thu Oct 13 13:31:54 BST 2016

On Thursday, October 13, 2016 01:12:27 PM Martin Graesslin wrote:
> Just an example of an issue I run into today:
> https://git.reviewboard.kde.org/ r/129171/
> Application just crashed on startup due to a missing nullptr check exposed
> by a different windowing systems.

This intrigued me, so I went looking at the Qt docs 
(e.g.http://doc.qt.io/qt-5/qguiapplication.html#clipboard)  to see if they 
said anything about the returned pointers:

QClipboard *QGuiApplication::clipboard()

Returns the object for interacting with the clipboard.
const QMimeData *QClipboard::mimeData(Mode mode = Clipboard) const

Returns a reference to a QMimeData representation of the current clipboard 

Neither function's documentation says it can return a nullptr; neither says it 
can't. But what really surprises me in the documentation is the use of the 
words "object" and "reference" here. Since that's not what those functions are 
returning, and certainly the use of the word "reference" suggests to me (when 
somewhat-wrongly applied to a pointer) "can't be null".

So to a very limited extent we can claim it's the documentation's fault.


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