1 files changed, 12 insertions, 0 deletions
diff --git a/standalone/list.h b/standalone/list.h
index 1ac93c2f65d..0137667d1dc 100644
--- a/standalone/list.h
+++ b/standalone/list.h
@@ -110,6 +110,18 @@ template <class T> struct SinglyLinkedList : public IntrusiveList<T> {
     Size--;
   }
 
+  // Insert X next to Prev
+  void insert(T *Prev, T *X) {
+    DCHECK(!empty());
+    DCHECK_NE(Prev, nullptr);
+    DCHECK_NE(X, nullptr);
+    X->Next = Prev->Next;
+    Prev->Next = X;
+    if (Last == Prev)
+      Last = X;
+    ++Size;
+  }
+
   void extract(T *Prev, T *X) {
     DCHECK(!empty());
     DCHECK_NE(Prev, nullptr);