<![CDATA[Do i have to check QModelIndex::isValid() in overriden methods of QAbstractListModel]]>I'm writing a custom item model implementation - i have a class that inherits from QAbstractListModel and overrides

  • Qt::ItemFlags flags( const QModelIndex & index )
  • QVariant data( const QModelIndex & index, int role )
  • bool setData( const QModelIndex & index, const QVariant & value, int role )
  • QMimeData * mimeData( const QModelIndexList & indexes )
  • ... and more ...

In these functions named above, do i have to check if the model indexes are valid, or can i count with the framework always supplying me valid ones? I haven't seen this being specified anywhere in the documentation.

]]>https://forum.qt.io/topic/161690/do-i-have-to-check-qmodelindex-isvalid-in-overriden-methods-of-qabstractlistmodelRSS for NodeTue, 13 Oct 2026 02:56:35 GMTSun, 06 Apr 2025 09:42:23 GMT60<![CDATA[Reply to Do i have to check QModelIndex::isValid() in overriden methods of QAbstractListModel on Sun, 06 Apr 2025 11:30:01 GMT]]>@Youda0008
Most code does/should check. If you look at the base implementations in QAbstractListModel I think you will see they do check isValid()? Or at least all derived classes? Since you are overriding them, or doing your own stuff before you call them, I would check. It's only an if. Or at least check if compiling for debug?

]]>https://forum.qt.io/post/824084https://forum.qt.io/post/824084Sun, 06 Apr 2025 11:30:01 GMT