+XBT_PUBLIC(double) xbt_heap_maxkey(xbt_heap_t H);
+XBT_PUBLIC(void *) xbt_heap_maxcontent(xbt_heap_t H);
+XBT_PUBLIC(void) xbt_heap_set_update_callback(xbt_heap_t H, void (*update_callback)(void*, int));
+XBT_PUBLIC(void*) xbt_heap_remove(xbt_heap_t H, int i);