# Active Template Library

6 Hacker News commenters recommended Active Template Library and 2 criticized it, November 2025 to November 2026. It was recommended in 4 of 13 months.

**Verdict:** Free C++ library for COM code that people find useful with little cost. Common caveat: awkward casting and sharp edges make it messy.

## Why people recommend it

- Useful abstraction with little cost (1 comments): "ATL/WTL (and MFC) are still very useful abstractions with little cost." ([source](https://news.ycombinator.com/item?id=50250581))
- Good for COM programming (2 comments): "I never went back to doing COM in C after that." ([source](https://news.ycombinator.com/item?id=48154908)) "especially if you need to do com stuff" ([source](https://news.ycombinator.com/item?id=47477758))
- Overlooked alternative to Microsoft's guidance (1 comments): "Yet they didn't mention another piece of work called ATL. Active Template Library." ([source](https://news.ycombinator.com/item?id=47658513))

## What people warn about

- Heavy casting overwhelms business logic (1 comments): "even with that help, our actual business logic was absolutely overwhelmed by all the annoying casting" ([source](https://news.ycombinator.com/item?id=48086394))
- Messy when used with WRL (1 comments): "Using it from ATL, WRL, C++/WinRT, is a mess unfortunely." ([source](https://news.ycombinator.com/item?id=46910483))
- Sharp edges and room to improve (1 comments): "all have their sharp edges and could be so much better" ([source](https://news.ycombinator.com/item?id=49213511))

## Cite as

Hacker Approved, "Active Template Library", https://hackerapproved.com/p/atl/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).