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# Publishers.MeasureInterval

A publisher that measures and emits the time interval between events received from an upstream publisher.

```
struct MeasureInterval<Upstream, Context> where Upstream : Publisher, Context : Scheduler
```

## Topics

### Creating a measure interval publisher

[`init(upstream:scheduler:)`](/documentation/Combine/Publishers/MeasureInterval/init(upstream:scheduler:))

Creates a publisher that measures and emits the time interval between events received from an upstream publisher.

### Declaring supporting types

[`Publishers.MeasureInterval.Output`](/documentation/Combine/Publishers/MeasureInterval/Output)

The kind of values published by this publisher.

[`Publishers.MeasureInterval.Failure`](/documentation/Combine/Publishers/MeasureInterval/Failure)

The kind of errors this publisher might publish.

### Inspecting publisher properties

[`upstream`](/documentation/Combine/Publishers/MeasureInterval/upstream)

The publisher from which this publisher receives elements.

[`scheduler`](/documentation/Combine/Publishers/MeasureInterval/scheduler)

The scheduler used for tracking the timing of events.


---

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