Regression: Can no longer iterate over a ListRef using for-in loop about swiftglib

[rhx]

You are on the right track with TypedListRef. However, TypeList* is for primitive types (such as CInt), but your list is tracking a reference to another GTK object (a TreePath), what you probably want here is something along the following lines:

myIconView.onSelectionChanged { (unownedSelf: IconViewRef) in
    print ("Change in selection")

    if let selectedItems = unownedSelf.selectedItems {

        let typedSelectedItems = ReferenceListRef<TreePathRef>(selectedItems)

        print ("Before the loop")

        for path in typedSelectedItems {
        
            print("Inside the loop")
            
            // (More code here...)
        }
    }
}

Could you let me know if this works for you?

[jasaldivara]

The reason why I'm using a Glib.ListRef is because I'm on Gtk3, iterating over the selectedItems of an IconView, and the getSelectedRows() of a GtkTreeSelection. Both of them return a ListRef representing a list of TreePath objects.

After some digging on the latest commits, I found out Glib.ListRef was replaced with a typed variant: TypedListRef. ListRef still exists as generated code, but it does not longer conform to the Sequence protocol, while the new one TypedListRef does conform to the protocol.

After that, now I'm using IconView.selectedItems: ListRef to create a TypedListRef<TreePath>. This is how my code looks now:

myIconView.onSelectionChanged { (unownedSelf: IconViewRef) in
    print ("Change in selection")

    if let selectedItems = unownedSelf.selectedItems {

        let typedSelectedItems = TypedListRef<TreePath>(selectedItems)

        print ("Before the loop")

        for path in typedSelectedItems {
        
            print("Inside the loop")
            
            // (More code here...)
        }
    }
}

Now, my code compiles correctly, without any error messages, but I'm having a new problem: The program crashes when i'm iterating over the TypedListRef:

Change in selection
Before the loop
fish: Job 1, 'swift run MySwiftProgram' terminated by signal SIGSEGV (Address boundary error)

I think the crash happens in the for path in typedSelectedItems { line, because the previous message is printed to the terminal, but the inside print statement does not get executed.

[jasaldivara]

Yes, using ReferenceListRef<TreePathRef> instead of TypedListRef<TreePath> solved my problem.

Thanks!