---
title: OSLogMessageComponent.Argument.undefined
framework: OSLog
role: symbol
role_heading: Case
platforms: [iOS 15.0+, iPadOS 15.0+, Mac Catalyst 15.0+, macOS 10.15+, tvOS 15.0+, visionOS 1.0+, watchOS 8.0+]
path: oslog/oslogmessagecomponent/argument-swift.enum/undefined
---

# OSLogMessageComponent.Argument.undefined

A undefined object returned by the OSLog API that corresponds to the argument.

## Declaration

```swift
case undefined
```

## See Also

### Constants

- [OSLogMessageComponent.Argument.data(_:)](oslog/oslogmessagecomponent/argument-swift.enum/data(_:).md)
- [OSLogMessageComponent.Argument.double(_:)](oslog/oslogmessagecomponent/argument-swift.enum/double(_:).md)
- [OSLogMessageComponent.Argument.signed(_:)](oslog/oslogmessagecomponent/argument-swift.enum/signed(_:).md)
- [OSLogMessageComponent.Argument.string(_:)](oslog/oslogmessagecomponent/argument-swift.enum/string(_:).md)
- [OSLogMessageComponent.Argument.unsigned(_:)](oslog/oslogmessagecomponent/argument-swift.enum/unsigned(_:).md)