+
+ // Remove grobs that do not satisfy the predicate, leaving the order
+ // unchanged.
+ void filter (bool (*predicate) (const Grob *));
+
+ // Run a function on all grobs in this array. If the function returns null,
+ // remove the original grob, reducing the size of the array. If the function
+ // returns a Grob, replace the original grob with the returned Grob.
+ void filter_map (Grob * (*map_fun) (Grob *));
+
+ // Like src.filter_map (f), but store the result in this array instead of
+ // mutating the input.
+ void filter_map_assign (const Grob_array &src, Grob * (*map_fun) (Grob *));