Lightning Talk: Your Favorite Undefined Behavior in C++ - JF Bastien - CppNow 2023

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Lightning Talk: Your Favorite Undefined Behavior in C++ - JF Bastien - CppNow 2023
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You tell me.
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JF Bastien
JF is chief architect at Woven by Toyota. He chairs the evolution of the C++ programming language. JF has worked on a variety of compilers for a variety of programming languages, implementing language features, improving performance / security / safety, targeting novel architectures, and other fun things. See jfbastien.com.
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Video Sponsors: think-cell and Bloomberg Engineering
Audience Audio Sponsors: Innoplex and Maryland Research Institute
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Videos Filmed & Edited By Bash Films: bashfilms.com/
KZbin Channel Managed & Optimized By Digital Medium Ltd: events.digital-medium.co.uk
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CppNow 2024
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#boost #cpp #cppprogramming

[@tamirbahar]

The fact that multiplying unsigned shorts may result in a signed-int overflow is truly lovely.

[@DedmenMiller]

15:04... That is amazing. I was troubleshooting why after we updated our linux compiler, our game had weird unexplainable behavior.. the compiler optimized it away :D

[@PopescuAlexandruCristian]

I like that half of the undefined behavior from c++ is actually defined on most compilers on all the platforms that matters.

[@tslivede]

9:10 The (great) question on stackoverflow by James McNellis is called "Why is this program erroneously rejected by three C++ compilers?"

[@WilhelmDrake]

It would be nice if one could hear the audience discussion.

[@ajtan2607]

Would have been better if the audio was tweaked a little bit to make other's voices sound louder and clearer. Or just give them a mic. Or maybe put some subtitles.

[@__hannibaalbarca__]

UB this is best part in C/C++.

[@gabrielaubut-lussier1668]

I don't believe I heard anyone mentioning ODR violations!

[@yephick]

Very one-sided video where I can only hear half of the conversation :(

[@chrraz]

Not really being able to hear the audience unfortunately takes a lot away from an interactive talk like this :/

[@yrHeTateJlb]

If you don't repeat audience comments it's just 18 minutes of you saying "oh that's nice". I bet it's possible to make 10 hours version with no much difference

[@Bourg]

Oh that’s nice.

[@FalcoGer]

This is hard to listen to on youtube, especially if english is not your first language.

[@doBobro]

It's funny how much talks about UB and safety in recent times. But almost nothing about testing and coverage. It looks like testing culture is quite weak in C++ context.