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# ContactItemSyncAnchor

A snapshot point into enumerating changed contact items.

```
struct ContactItemSyncAnchor
```

## Overview

You can break an enumeration of changes into batches with multiple anchors to reduce the memory constraints on the system.
During enumeration, you may update the `generationMarker` and `offset` to reflect progress enumerating the changes as they occurred, possibly across mutiple database generations and how many changes occurred within each database generation.

## Topics

### Creating a sync anchor

[`init(generationMarker:offset:)`](/documentation/ContactProvider/ContactItemSyncAnchor/init(generationMarker:offset:))

Creates a sync anchor with the given generation marker and offset.

### Inspecting sync anchor properties

[`generationMarker`](/documentation/ContactProvider/ContactItemSyncAnchor/generationMarker)

A value specific to your data source identifying the database generation you’re enumerating for changes.

[`offset`](/documentation/ContactProvider/ContactItemSyncAnchor/offset)

An offset from the anchor’s generation marker.

### Encoding and decoding


---

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