diff --git a/src/listhead.rs b/src/listhead.rs
index 69e17e5..a05e6c8 100644
--- a/src/listhead.rs
+++ b/src/listhead.rs
@@ -74,4 +74,12 @@ impl<T> ListHead<T> {
         head.borrow_mut().init();
     }
 
+    pub fn for_each(&self, cb: fn () -> i64) {
+        let pos = self.next.clone();
+        let self_weak = &Rc::downgrade(&self.get_rc_refcell());
+        while !Weak::ptr_eq(&pos, self_weak) {
+
+        }
+    }
+
 }