Question

I store objects of a custom data type in QStandardListItems. I recover these objects by calling:

i.data(Qt::UserRole + 1).value<LiteReach>();

This only creates a new object in the stack. Any changes I do to them would be temporary.

Is there a way to get the base object stored in itemData so that it could be manipulated directly?
If not what would be the preferred method to change itemData?

I would like not to call setData each time an object is modified since it would consume a lot of resources.

Answer 1

You could use pointers that allow access to the concrete data objects instead of copying the whole data into a QVariant like above.

The problem is that value() returns a copy of your data. So if you make any modifications, they will be gone as soon as the copy is removed from stack.

If you don’t want to use pointers, I guess you’ll have to stick with setData().