# Undo.UndoRedoEventCallback

> Delegate used for Undo.undoRedoEvent.

## Definition

* **Type:** Delegate
* **Namespace:** [UnityEditor](/engine/6000.0/script-reference/unityeditor.md)
* **Assembly:** UnityEditor

```csharp
public delegate void Undo.UndoRedoEventCallback(in UndoRedoInfo undo)
```