RobJan 21, 2023

RT @[email protected]

Can you spot the undefined behavior?

Back to doing some C++ with Eigen. Just wanted to transform some points, and this one had me scratching my head for a while. Solution in next tweet (thanks to my colleague @[email protected] for pointing out the problem!)

🧵
1/4

🐦🔗: https://twitter.com/andreas_longva/status/1616368924714741761

Andreas Longva on Twitter

“Can you spot the undefined behavior? Back to doing some C++ with Eigen. Just wanted to transform some points, and this one had me scratching my head for a while. Solution in next tweet (thanks to my colleague @w1th0utnam3 for pointing out the problem!) 🧵 1/4”

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An issue that can easily hide in "modern C++", but which would have been trivially detected with even basic lifetime analysis. But please, Bjarne, tell us about other Rust CVEs and issues that C++ conveniently just defines away as UB.
Jan 21, 2023 at 2:13pmWeb