extern edge_t *new_edge(void) __attribute__ ((__malloc__));
extern void free_edge(edge_t *);
extern struct splay_tree_t *new_edge_tree(void) __attribute__ ((__malloc__));
extern void free_edge_tree(struct splay_tree_t *);
extern edge_t *new_edge(void) __attribute__ ((__malloc__));
extern void free_edge(edge_t *);
extern struct splay_tree_t *new_edge_tree(void) __attribute__ ((__malloc__));
extern void free_edge_tree(struct splay_tree_t *);