---
title: Release Notes: C++
slug: v4-5/cpp/release-notes
docTags: 
createdAt: 2023-11-15T00:54:41.303Z
---

# C++ Version 4.5.4

Synchronized version bump release — no changes

# C++ Version 4.5.3

Synchronized version bump release — no changes

# C++ Version 4.5.2

Synchronized version bump release — no changes

# C++ Version 4.5.1

**Added**

- Support for light JWTs (separating identity data) (#11063)


**Fixed**

- A potential panic if an `f64::Nan is compared to a u64 or i64 during collation.`

# C++ Version 4.5.0

:::hint{type="success"}
If you are upgrading from v4.x to v4.5 without adopting any new functionality there will be no changes required and all other v4.x devices will sync with v4.5 devices.

v4.5 follows semver and is backwards compatible with all previous v4 versions. All changes in v4.5 are additive and don’t require any additional work when upgrading.
:::

:::hint{type="warning"}
If you plan on adopting DQL as part of the migration to v4.5 review [Legacy-to-DQL Adoption Guide](docId\:e2ZbKPkQwYMyXW5pN4rjM)

***Note:*** All existing APIs and queries (eg. `find` , `findById` , `observe` , ect.) will remain supported for the foreseeable future. We will notify customers with advanced warning when we plan to end of life these APIs.
:::

**Added**

- New C++ SDK for Android. (#10218)
- `Store::execute` method to execute DQL queries. (#10421)
- The `StoreObserver` class to the `execute` function when the documents that match a query are changed. (#10421)
- `Store::register_observer` to create a new `StoreObserver`. (#10421)
- The `register_subscription` method to the `Sync` class. (#10485)
- `SyncSubscription` class that allows you to receive updates on documents. (#10485)
- The `Sync` class to manage subscriptions. (#10702)
- `SmallPeerInfo` property to Ditto allowing access to, and configuration of, Small Peer Info. (#10838

**Deprecated**

- `LanConfig.multicast_enabled` property. (#10126)

**Changed**

- Ditto C++ for iOS SDK is built and tested with Xcode 14.3.1. (#10177)

**Improved**

- Performance by implementing bipartite distance-aware mesh topology. (#10632)
- Memory usage and performance of Documents. (#10736)
- Reduced metadata accumulation after eviction by clearing remote summaries. (#7065)
- Serialization performance. (#9112)

**Fixed**

- Bluetooth and LAN transports fail to stop on Windows and Linux. (#8809)
- Made logging more robust to failed writes in a specific set of circumstances. (#10077)
- Addressed a warning from SQLite that sometimes occurs on startup about a schema change. (#10501)
- Presence graph may not show all active connections. (#10507)
- When observing peers, isConnectedToDittoCloud property may be incorrect. (#10534)
- initial logging events now use the same format as all other logs. (#10611)
- mesh could choose random connections. (#10711)
- A bug with Ditto's internal crash handler. (#10022)

:::hint{type="info"}
To access release notes for earlier Ditto versions, go to [v4.4](https://docs.ditto.live/v4-4) of the documentation by clicking the version picker located in the upper left corner and selecting **4.4** from the menu.
:::