diff --git a/src/listhead.rs b/src/listhead.rs
index a05e6c8..0cac040 100644
--- a/src/listhead.rs
+++ b/src/listhead.rs
@@ -74,11 +74,14 @@ impl<T> ListHead<T> {
         head.borrow_mut().init();
     }
 
-    pub fn for_each(&self, cb: fn () -> i64) {
-        let pos = self.next.clone();
+    pub fn for_each(&self, cb: fn (&Weak::<RefCell::<T>>) -> bool) {
+        let mut pos = self.next.clone();
         let self_weak = &Rc::downgrade(&self.get_rc_refcell());
         while !Weak::ptr_eq(&pos, self_weak) {
-
+            if !cb(&pos.upgrade().unwrap().borrow().data()) {
+                break;
+            }
+            pos = pos.upgrade().unwrap().borrow().next.clone();
         }
     }