lots of clang-tidy warnings

[rursprung]

my IDE (CLion) automatically shows clang-tidy warnings and there are quite a lot of them in this project (+ also some validations from CLion itself).

you could enable clang-tidy by default in CI and let it upload the results to the PRs without failing the PRs (and you could probably configure it in such a way that new code mustn't have warnings while markers for unchanged code don't fail the build). this would give visibility to the problems.

on a related note: while in #42 you stated that you prefer not to add -Werror to all the builds may i suggest that you might want to have a CI build which adds -Werror (e.g. via environment variables) to check for errors? in CI you can control the used compiler so there should be no surprises there (+ in CI it might make sense to always test with the latest to catch new validations).