# RefRO(NativeArray<T>, int)

> Stores a safe reference to a component from an array of components at the index.

## Definition

* **Type:** Constructor
* **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md)
* **Assembly:** UnityEngine.EntitiesModule

```csharp
public RefRO(NativeArray<T> componentDataArray, int index)
```

### Parameters

**** (\[NativeArray\<T>]\(/engine/7000.0/script-reference/unity/collections/nativearray1)): The NativeArray of components.**** (\[int]\(https\://learn.microsoft.com/dotnet/api/system.int32)): The index of the the components.