# IsDefaultValue(in AtomicSafetyHandle)

> Checks if an AtomicSafetyHandle has its default value.

## Definition

* **Type:** Method
* **Namespace:** [Unity.Collections.LowLevel.Unsafe](/engine/6000.3/script-reference/unity/collections/lowlevel/unsafe.md)
* **Assembly:** UnityEngine.CoreModule

## IsDefaultValue(AtomicSafetyHandle)

```csharp
public static bool IsDefaultValue(in AtomicSafetyHandle handle)
```

### Parameters

**** (\[AtomicSafetyHandle]\(/engine/6000.3/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle)): The AtomicSafetyHandle to check.

### Returns

| Type                                                          | Description                                                                                                  |
| ------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------ |
| [bool](https://learn.microsoft.com/dotnet/api/system.boolean) | `true` if the AtomicSafetyHandle hasn't been initialized and still has its default value; `false` otherwise. |

### Remarks

An AtomicSafetyHandle still has its default value if it hasn't been initialized by being assigned or passed to [AtomicSafetyHandle.Create](/engine/6000.3/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/create.md).

By default, an AtomicSafetyHandle variable isn't initialized, which means it doesn't reference any central record and doesn't have a stored a version number. This changes when you pass the variable to [AtomicSafetyHandle.Create](/engine/6000.3/script-reference/unity/collections/lowlevel/unsafe/atomicsafetyhandle/create.md), or when you assign it from an existing initialized AtomicSafetyHandle.