> ## Documentation Index
> Fetch the complete documentation index at: https://docs.larksh.com/llms.txt
> Use this file to discover all available pages before exploring further.

# C++ SDK

> Use the Firebase C++ SDK with Lark

Point your Firebase C++ SDK at Lark by passing your Lark URL to `Database::GetInstance()`. Everything else (listeners, writes, queries) works without changes.

## Setup

Add the Firebase C++ SDK to your project. Follow the [Firebase C++ setup guide](https://firebase.google.com/docs/cpp/setup) for your platform (Android NDK, iOS, or desktop).

Make sure the Realtime Database library is linked:

* **Android**: `firebase_database` in your `CMakeLists.txt`
* **iOS**: `firebase.framework` and `firebase_database.framework`
* **Desktop**: `firebase_database` library

## Connect to Lark

Pass your Lark URL when getting the database instance:

```cpp theme={null}
#include "firebase/app.h"
#include "firebase/database.h"

firebase::App* app = firebase::App::Create();

// Change this from https://PROJECT_ID.firebaseio.com
firebase::database::Database* database =
    firebase::database::Database::GetInstance(
        app, "https://your-lark-project-id.larkdb.net");

firebase::database::DatabaseReference ref =
    database->GetReference("players/alice");
```

If your `google-services.json` (Android) or `GoogleService-Info.plist` (iOS) already has the database URL, you can update it there instead and use `Database::GetInstance(app)` without a URL argument.

## Database routing

If your Firebase app stores many independent data silos under path prefixes (game rooms, workspaces, etc.), see [Database routing](/firebase/database-routing) for options on splitting them into separate Lark databases.