> For the complete documentation index, see [llms.txt](https://42-cursus.gitbook.io/guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://42-cursus.gitbook.io/guide/4-rank-04/cpp-00-04-doing/cpp04-doing.md).

# CPP04 (doing)

### Main topics

```
Subtype polymorphism, abstract classes, interfaces
```