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# CMTIMERANGE_IS_INVALID(_:)

Returns a Boolean value that indicates whether a time range is invalid.

```
func CMTIMERANGE_IS_INVALID(_ range: CMTimeRange) -> Bool
```

## Parameters

`range`

A time range.

## Return Value

<doc://com.apple.documentation/documentation/Swift/true> if `range` is invalid; otherwise, <doc://com.apple.documentation/documentation/Swift/false>.

## Discussion

---

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