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boost-asio-pro

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Use for any C++ networking code with Boost.Asio or standalone Asio (TCP/UDP, SSL, timers, strands, io_context, co_spawn, awaitable, completion handlers), before writing or reviewing it. Applies lifetime, strand and cancellation rules that avoid the classic async bugs.

engineering/boost-asio-pro/SKILL.md

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# Boost.Asio / standalone Asio

## Overview

Write async C++ networking code that compiles on the *user's* Boost, not the newest one. Asio's API changed shape three times (classic `io_service` → `io_context` → C++20 coroutines) and most Asio code on the internet is from the first era, so **pick the style from the toolchain first**, then follow that style's reference file.

**References:** [Boost.Asio](https://www.boost.org/doc/libs/latest/doc/html/boost_asio.html) · [standalone Asio](https://think-async.com/Asio/)

Use this skill whenever async C++ networking code is being written or reviewed — and especially when the target toolchain is old, where coroutine examples simply will not compile. The three worked implementations it references are CI-verified from Boost 1.62 (2016) through 1.90.

## Step 1: pick the style (do this before writing code)

Determine the Boost (or Asio) version and the C++ standard actually in use — `find_package(Boost)` output, `dpkg -l libboost-dev`, `brew info boost`, `CMAKE_CXX_STANDARD`, or ask. Do not assume the newest.