@Override
			public T next() {
				@SuppressWarnings("unchecked")
				T result = (T) manager.doCreateUndefinedUnit(snap, address, null, 0);
				address = forward ? address.next() : address.previous();
				return result;
			}
Construct a composite view

@param manager the code manager, from which individual views are retrieved
Ghidra/Debug/Framework-TraceModeling/src/main/java/ghidra/trace/database/listing/AbstractWithUndefinedDBTraceCodeUnitsMemoryView.java