# UnityAction<T0, T1, T2, T3>

> Four argument delegate used by UnityEvents.

## Definition

* **Type:** Delegate
* **Namespace:** [UnityEngine.Events](/engine/6000.6/script-reference/unityengine/events.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
public delegate void UnityAction<T0, T1, T2, T3>(T0 arg0, T1 arg1, T2 arg2, T3 arg3)
```