(glib:define-gboxed-opaque attr-iterator "PangoAttrIterator"
  :export t
  :type-initializer "pango_attr_iterator_get_type"
  :alloc (error "PangoAttrIterator cannot be created from the Lisp side."))  

The pango:attr-iterator structure is used to represent an iterator through a pango:attr-list instance. The pango:attr-iterator structure is opaque, and has no user visible fields. A new iterator is created with the pango:attr-list-iterator function. Once the iterator is created, it can be advanced through the style changes in the text using the pango:attr-iterator-next function. At each style change, the range of the current style segment and the attributes currently in effect can be queried.