-void xbt_set_add (xbt_set_t set, xbt_set_elm_t elm, void_f_pvoid_t *free_func);
-void xbt_set_remove (xbt_set_t set, xbt_set_elm_t elm);
-void xbt_set_remove_by_name (xbt_set_t set, const char *key);
-void xbt_set_remove_by_name_ext (xbt_set_t set, const char *key, int key_len);
-void xbt_set_remove_by_id (xbt_set_t set, int id);
+XBT_PUBLIC(void) xbt_set_add(xbt_set_t set, xbt_set_elm_t elm,
+ void_f_pvoid_t free_func);
+XBT_PUBLIC(void) xbt_set_remove(xbt_set_t set, xbt_set_elm_t elm);
+XBT_PUBLIC(void) xbt_set_remove_by_name(xbt_set_t set, const char *key);
+XBT_PUBLIC(xbt_set_elm_t) xbt_set_get_by_name_or_null(xbt_set_t set,
+ const char *key);
+XBT_PUBLIC(void) xbt_set_remove_by_name_ext(xbt_set_t set, const char *key,
+ int key_len);
+XBT_PUBLIC(void) xbt_set_remove_by_id(xbt_set_t set, int id);