There are properties that are computed instead of being tied to a specific data member, which can be created via Q_OBJECT_COMPUTED_PROPERTY. At the moment they can be only readable, which is probably enough for most of the use-cases. But there are also cases, when such properties need to be also writable, for example:

• QVarinatAnimation::{startValue, endValue}
• QSortFilterProxyModel::filterCaseSensitivity