Docs Menu
Docs Home
/
MongoDB Atlas
/
Atlas Device SDKs
/
C++ SDK

Install the C++ SDK

On this page

  • Requirements
  • Install
  • Usage
  • Build an Android App

Atlas Device SDK for C++ enables client applications written in C++ to access data stored on devices and sync data with Atlas. This page details how to install the C++ SDK in your project and get started.

Requirements

  • Minimum C++ standard: C++17.

  • For development on macOS: Xcode 11.x or later.

  • For development on Windows: Microsoft Visual C++ (MSVC).

  • Otherwise, we recommend git and CMake.

Install

Tip

Atlas Device SDK and Realm

The SDK uses Realm Core database for device data persistence. When you install the C++ SDK, the package names reflect Realm naming.

When developing with Xcode, you can use Swift Package Manager (SPM) to install realm-cpp.

1

Add Package Dependency

In Xcode, select File > Add Packages....

2

Specify the Repository

Copy and paste the following into the search/input box.

https://github.com/realm/realm-cpp
3

Select the Package Products

Under Package Product, select realm-cpp-sdk. Under Add to Target, select the target you would like to add the SDK to. For example, the target might be the main executable of your app. Click Add Package.

You can use CMake with the FetchContent module to manage the SDK and its dependencies in your C++ project.

Create or modify your CMakeLists.txt in the root directory of your project:

  1. Add Include(FetchContent) to include the FetchContent module in your project build.

  2. Use FetchContent_Declare to locate the SDK dependency and specify the version tag you want to use.

  3. Use the FetchContent_MakeAvailable() command to check whether the named dependencies have been populated, and if not, populate them.

  4. Finally, target_link_libraries() links the SDK dependency to your target executable.

To get the most recent version tag, refer to the releases on GitHub: realm/realm-cpp.

Set the minimum C++ standard to 17 with set(CMAKE_CXX_STANDARD 17).

In a Windows install, add the required compiler flags listed below.

cmake_minimum_required(VERSION 3.15)
project(MyDeviceSDKCppProject)
# Minimum C++ standard
set(CMAKE_CXX_STANDARD 17)
# In a Windows install, set these compiler flags:
if(MSVC)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Zc:preprocessor /bigobj")
endif()
# Include the FetchContent module so you can download the C++ SDK
Include(FetchContent)
# Declare the version of the C++ SDK you want to download
FetchContent_Declare(
  cpprealm
  GIT_REPOSITORY https://github.com/realm/realm-cpp.git
  GIT_TAG        v1.0.0
)
# The MakeAvailable command ensures the named dependencies have been populated
FetchContent_MakeAvailable(cpprealm)
# Create an executable target called myApp with the source file main.cpp
add_executable(myApp main.cpp)
target_link_libraries(myApp PRIVATE cpprealm)

Run CMake in a gitignored directory, such as build, to generate the build configurations that you can then use to compile your app:

# build/ is in .gitignore
mkdir build
cd build
cmake .. # Create Makefile by reading the CMakeLists.txt in the parent directory (../)
make # Actually build the app

You can use CMake to generate more than simple Makefiles by using the -G flag. See the CMake documentation for more information.

Usage

Include the Header

Make the C++ SDK available in your code by including the cpprealm/sdk.hpp header in the translation unit where you want to use it:

#include <cpprealm/sdk.hpp>

Build an Android App

The C++ SDK supports building Android apps. To build an Android app:

  • Add <uses-permission android:name="android.permission.INTERNET" /> to your AndroidManifest.xml

  • Add the subdirectory of the C++ SDK to your native library's CMakeLists.txt and link it as a target library:

    set(CMAKE_CXX_STANDARD 17)
    add_subdirectory("realm-cpp")
    ...
    target_link_libraries(
       # Specifies the target library.
       myapplication
       # make sure to link the C++ SDK.
       cpprealm
    )

  • Ensure that the git submodules are initialized inside of the realm-cpp folder before building.

  • When instantiating the database or the SDK App, you must pass the filesDir.path as the path parameter in the respective constructor or database open template.

For an example of how to use the C++ SDK in an Android app, refer to the Android RealmExample App in the realm-cpp GitHub repository.

Specifically, refer to the MainActivity.kt & native-lib.cpp files in the Android example app for code examples.

Back

C++ SDK

Next

Quick Start

On this page