You can show attributes as association relationships in diagrams.
You must be in the C/C++ perspective and have a diagram open in the
diagram editor.
To show an attribute as an association:
In the diagram editor, right-click an attribute; then click .
The attribute is removed from the classifier and appears as an association
relationship in the diagram.
Tip: You can also drag and drop an attribute outside
the classifier to show the attribute as an association.