# ifndef H_LINKED_LISTS_H
# define H_LINKED_LISTS_H

typedef struct conscell
{
  void *data;
  struct conscell *next;
} conscell;

conscell *ll_push ( conscell *list, void *data );
conscell *ll_pop ( conscell *list );
void      ll_free ( conscell *list );
conscell *ll_reverse ( conscell *list );
conscell *ll_sort ( conscell *list,
          int (*cmp) (const void *a, const void *b, void *params ),
          void *params );
conscell *ll_filter ( conscell *list,
          int (*filter) (const void *a), conscell **removed );
int       ll_length ( conscell *list );
# endif