# PhysicsMask.ResetBitIterator

> An iterator that will iterate only the bits that are reset (0) in a PhysicsMask

## Definition

* **Type:** Struct
* **Namespace:** [Unity.U2D.Physics](/engine/6000.5/script-reference/unity/u2d/physics.md)
* **Assembly:** UnityEngine.PhysicsCore2DModule
* **Implements:** [IEnumerable\<int>](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1), [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.ienumerable), [IEnumerator\<int>](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerator-1), [IEnumerator](https://learn.microsoft.com/dotnet/api/system.collections.ienumerator), [IDisposable](https://learn.microsoft.com/dotnet/api/system.idisposable)

```csharp
public struct PhysicsMask.ResetBitIterator : IEnumerable<int>, IEnumerable, IEnumerator<int>, IEnumerator, IDisposable
```