# UnityEvent()

> Initializes a new instance of the UnityEvent class.

## Definition

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

```csharp
public UnityEvent()
```

### Remarks

Use the constructor without arguments to create a zero-argument event callback. If your event requires arguments, use the generic versions of UnityEvent.

### Examples

```csharp
using UnityEngine;
using UnityEngine.Events;

public class ExampleClass : MonoBehaviour
{
    UnityEvent m_ZeroArgEvent;
    UnityEvent<int> m_OneArgEvent;
    UnityEvent<int, int> m_TwoArgEvent;
    UnityEvent<int, int, int> m_ThreeArgEvent;
    UnityEvent<int, int, int, int> m_FourArgEvent;

    void Start()
    {
        //Construct simple UnityEvents from 0 up to 4 int arguments.
        if (m_ZeroArgEvent == null)
            m_ZeroArgEvent = new UnityEvent();

        if (m_OneArgEvent == null)
            m_OneArgEvent = new UnityEvent<int>();

        if (m_TwoArgEvent == null)
            m_TwoArgEvent = new UnityEvent<int, int>();

        if (m_ThreeArgEvent == null)
            m_ThreeArgEvent = new UnityEvent<int, int, int>();

        if (m_FourArgEvent == null)
            m_FourArgEvent = new UnityEvent<int, int, int, int>();
    }
}
```