How to delete the user_data in a custom TreeModel in in gtkmm?

Question

I create user_data something like this:

bool
MyTreeModel::iter_nth_root_child_vfunc (int index, iterator & iter) const
{
   iter .gobj () -> user_data = new UserData (...);
   return true;
}

I can create the user data, but is there a way to get notified when the iterator is destroyed, so I can delete my user data?

Answer 1

No; user_data is a non-owning pointer. You should parallel the tree with a node-based container (e.g. std::map) and store your UserData objects in that, with the user_data pointer pointing into the container.