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LaunchDarkly Server-Side SDK for C/C++


The LaunchDarkly Server-Side SDK for C/C++ is designed primarily for use in multi-user systems such as web servers and applications. It follows the server-side LaunchDarkly model for multi-user contexts. It is not intended for use in desktop and embedded systems applications.

For using LaunchDarkly in client-side C/C++ applications, refer to our client-side C/C++ SDK.

LaunchDarkly overview

LaunchDarkly is a feature management platform that serves over 100 billion feature flags daily to help teams build better software, faster. Get started using LaunchDarkly today!

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This version of the LaunchDarkly SDK is compatible with POSIX environments (Linux, OS X, BSD) and Windows.

Getting started

Download a release archive from the GitHub Releases for use in your project. Refer to the SDK documentation for complete instructions on getting started with using the SDK.

CMake Compatability

Currently, the minimum required version of CMake necessary to build the SDK is 3.11.

At configuration time, CMake will download various 3rd party dependencies of the SDK from remote locations.

Other dependencies must be present on the build host:

  • CURL (FindPackage(CURL))
  • PCRE (FindPackage(PCRE))

The project uses C++ for unit testing. To exclude the unit tests from the build, disable via CMake option:


To enable the Redis store integration, enable via CMake option:


The SDK may be included in another project via add_subdirectory. For example,

add_executable(main main.c)
target_link_libraries(main ldserverapi)

It is also possible to install the SDK to a desired location, for example:

mkdir build && cd build
cmake .. -DCMAKE_INSTALL_PREFIX=/path/to/desired/install/location
cmake --build . --target install

Learn more

Read our documentation for in-depth instructions on configuring and using LaunchDarkly. You can also head straight to the complete reference guide for this SDK.


We run integration tests for all our SDKs using a centralized test harness. This approach gives us the ability to test for consistency across SDKs, as well as test networking behavior in a long-running application. These tests cover each method in the SDK, and verify that event sending, flag evaluation, stream reconnection, and other aspects of the SDK all behave correctly.


We encourage pull requests and other contributions from the community. Check out our contributing guidelines for instructions on how to contribute to this SDK.

About LaunchDarkly

  • LaunchDarkly is a continuous delivery platform that provides feature flags as a service and allows developers to iterate quickly and safely. We allow you to easily flag your features and manage them from the LaunchDarkly dashboard. With LaunchDarkly, you can:
    • Roll out a new feature to a subset of your users (like a group of users who opt-in to a beta tester group), gathering feedback and bug reports from real-world use cases.
    • Gradually roll out a feature to an increasing percentage of users, and track the effect that the feature has on key metrics (for instance, how likely is a user to complete a purchase if they have feature A versus feature B?).
    • Turn off a feature that you realize is causing performance problems in production, without needing to re-deploy, or even restart the application with a changed configuration file.
    • Grant access to certain features based on user attributes, like payment plan (eg: users on the ‘gold’ plan get access to more features than users in the ‘silver’ plan). Disable parts of your application to facilitate maintenance, without taking everything offline.
  • LaunchDarkly provides feature flag SDKs for a wide variety of languages and technologies. Read our documentation for a complete list.
  • Explore LaunchDarkly