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For some applications, especially those where it is necessary to
traverse lists in both directions, doubly-linked lists work much better
than singly-linked lists. The dlist class provides doubly-linked
lists with the same interface as the generic lists. See section Generic Lists. Thus you can interchange these data structures without having
to rewrite your code. The dlist_e elements are derived from the
generic list element class but they also include the backwards link
fields. The dlist_iter iterator works like the standard
glist_iter iterator, and the DECLARE_DLIST_CLASS macro is
the same as the DECLARE_LIST_CLASS macro except that it produces
doubly-linked lists. All of these things are implemented in the
`dlist.h' and `dlist.cc' files.
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