Anders Schau Knatten

We just published a new question! This one was contributed by GitHub user demercurizer. https://cppquiz.org/quiz/question/394

Me pointing at slides in front of the crowd

A quiz question on a screen in front of the audience

The reMarkable team celebrating their victory

An overview of the audience

Some pictures from my C++ Quiz at @ndcconferences.com TechTown. Thanks to everyone who came, and congratulations to the reMarkable team who won with a very impressive score!

We just published a new user contributed question! https://cppquiz.org/quiz/question/393

We just published a new question! This one was contributed by Armen Aslanyan: https://cppquiz.org/quiz/question/391

My proposal to C++ Under The Sea was accepted, so I'll be visiting for the first time! I'll be talking about the two memory models (language and CPU). Looking forward to it! cppunderthesea.nl

Update, that worked! Ffmpeg 4.6 is now available: conan.io/center/recip...

You too!

Intentionally obscured tiny C++ program

On the 🚄 to @ndcconferences.com TechTown, eating candy and chuckling to myself at this question for the Wednesday evening C++ pub quiz. What's the question? You'll have to wait and see...

Cover of the book C++ Brain Teasers by Anders Schau Knatten

Get my book at 40% off!

There's a flash sale at @pragprog.com right now, and you can get all their books at 40% off with the promo code "flashsale".

pragprog.com/titles/akbra...

Happy to announce another Pre-NDC-TechTown Oslo C++ Users Group Meetup! This year we'll have a talk by Klaus Iglberger, and as usual, @ndcconferences.com is sponsoring pizza. www.meetup.com/ocppug/event...

I've never made a PR to ConanCenter before. There was a fix in ffmpeg 4.4.5 which I need in order for ffmpeg 4.* to compile with GCC >12. ConanCenter currently support ffmpeg 7.1.1 and 4.4.4. Is it likely that they'll accept a PR which adds 4.4.6?

Just read the docs and discovered that you can turn off WarnOnSingleLocks. That helps, but should be the default imo. clang.llvm.org/extra/clang-...

Sonar has the same check as clang-tidy: rules.sonarsource.com/cpp/tag/sinc...

Compiler Explorer - C++ (x86-64 clang (trunk)) int main() { std::mutex m; { // Normal use case std::lock_guard l{m}; } { // Fails to compile if you forget to pass it the mutex, good! std::lock_guard ...

Clang-tidy 21 wants you to prefer scoped_lock over lock_guard. I feel scoped_lock should be a specialized tool when you need to lock several mutexes. It also allows you to pass it zero mutexes, which for a bug lock_guard doesn't allow: godbolt.org/z/WzG4YeP83

Do you think clang-tidy is right?

Discord - Group Chat That’s All Fun & Games Discord is great for playing games and chilling with friends, or even building a worldwide community. Customize your own space to talk, play, and hang out.

For reference, here's the thread discordapp.com/channels/400...

So intuitively, I'd expect that example to be just fine. I would just like to have a good source for that assumption. But then sehe, who counts as "asio documentation" in my book, seems to tell me I have to use an atomic here.

Found the thread on Discord, thanks! My question is what "proper synchronization" means. I agree that it has to do some sort of synchronization, but it also has to be fast and not do *too much* synchronization. Your example of "auto foo = new std::string();" is exactly what I'm trying to understand.

Haha, wrong asio! But thanks for wanting to help!

Do asio initiating functions synchronize with the completion handlers? I'm trying to understand the memory order related to asio initiating functions and completion handlers, but I can't find any documentation on this. Asio examples tend to start the io_context::run t...

Can someone help me with an Asio question? Does an initiating function synchronize (memory model-wise) with the corresponding completion handler? stackoverflow.com/questions/79...

Anders Schau Knatten - The Two Memory Models Programming languages like C, C++, and Rust all define a memory model, which allows you to reason about the ordering of memory operations in your program

I'll be back at the @meetingcpp.bsky.social in Berlin this year to speak about the two memory models! Really happy about this since it's only my second time there and I didn't make the cut last year. Looking forward to it! meetingcpp.com/mcpp/schedul...

Buy my C++ book! Or get three chapters for free at pragprog.com/titles/akbra... (no registration required)

YouTube video by NDC Conferences The Two Memory Models - Anders Schau Knatten - NDC TechTown 2024

Unfortunately we did not record it. But you can see a slightly shorter version of the same talk at youtu.be/rZaPQkpuEeM?...

First slide of my presentation The Two Memory Models

Meetup with Oslo C++ Users Group in one hour!

(That's just a random link I found btw, not an endorsement of the website)

Kontorsstol Håg SoFi svart komfort klädsel Unik kontorsstol som passar för många

I'm super happy with my Håg Sofi www.lomax.se/mobler/stola...

NOR 3 - 0 ITA

🤯

We're finally back up, after almost a week of absolutely horrible customer support from @dreamhost.bsky.social. Eventually, after trying to avoid helping, ignoring me, not accepting responsibility, and blaming everything else, they found and fixed the configuration issue on their server.

I'm still working with @dreamhost.bsky.social support on this. All my websites on this server have been unstable since the upgrade they made on Tuesday, and we've still not gotten to the bottom of it.

Heads up, we will have ~30 minutes of downtime on 27 May due to a server upgrade.