How to create an invalid QModelIndex?

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I am implementing a function which searchs a QModelIndex based on a QString input. However if I cannot find this index, the function should retun an invalid index. My model is a QStandardItemModel.

Is is okay to return invisibleRootItem()->index() as an invalid index? In the qt documentation is noted that it will always creates an invalid index.

qmodelindex qstandarditemmodel qt c++
1 Answers

You must use the default constructor of QModelIndex(e.g. return QModelIndex()) which is null as indicated in the docs:

QModelIndex::QModelIndex()
Creates a new empty model index. This type of model index is used to indicate that the position in the model is invalid.

(emphasis mine)

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