---
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title: Fun - cpp_add.fun — overview
subtitle: Documentation for cpp_add.fun — overview
description: Documentation for cpp_add.fun — overview
permalink: /documentation/examples/cpp_add/
lang: en
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---

# cpp_add.fun — overview

What it shows
- Calling into the optional C++ extension from Fun.

How to run
- export FUN_LIB_DIR="./lib"
- ./build_debug/fun examples/cpp_add.fun
- Or: fun examples/cpp_add.fun

Notes
- Requires the optional C++ extension to be enabled in your build; otherwise this example may be unavailable.