* src/misc/freelist.hh (free_list::remove, free_list::insert): New

methods.
* src/misc/freelist.cc (free_list::register_n,
free_list::releases_n): Rewrite using free_list::remove and
free_list::insert.
(free_list::remove, free_list::insert): New methods.
* src/tgba/bdddict.hh (bdd_dict::register_anonymous_variables):
New method.
(bdd_dict::annon_free_list): New subclass.
(bdd_dict::free_annonymous_list_of_type_of): New attribute.
* src/tgba/bdddict.cc (bdd_dict::register_all_variables_of,
bdd_dict::unregister_all_my_variables): Handle anonymous variables
too.
(bdd_dict::register_anonymous_variables,
bdd_dict::annon_free_list::annon_free_list,
bdd_dict::annon_free_list::extend): New methods.

src/misc/freelist.hh

@@ -47,6 +47,13 @@ namespace spot
 
     /// Dump the list to \a os for debugging.
     std::ostream& dump_free_list(std::ostream& os) const;
+
+    /// Extend the list by inserting a new pos-lenght pair.
+    void insert(int base, int n);
+
+    /// Remove \a n consecutive entries from the list, starting at \a base.
+    void remove(int base, int n = 0);
+
   protected:
 
     /// Allocate \a n integer.
@@ -62,6 +69,9 @@ namespace spot
     typedef std::pair<int, int> pos_lenght_pair;
     typedef std::list<pos_lenght_pair> free_list_type;
     free_list_type fl; ///< Tracks unused BDD variables.
+
+    /// Remove \a n consecutive entries from the list, starting at \a base.
+    void remove(free_list_type::iterator i, int base, int n);
   };
 
 }