void silc_hash_table_foreach(SilcHashTable ht, SilcHashForeach foreach,
                                 void *user_context);

    Traverse all entrys in the hash table and call the `foreach' for
    every entry with the `user_context' context.

    The hash table will not be rehashed during the traversing of the table,
    even if the table was marked as auto rehashable.  The caller also must
    not call silc_hash_table_rehash while traversing the table.