this post was submitted on 01 Nov 2024
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Programming
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This would be caught by ASan and other tools though, which should be part of any review.
I think you have a hard time understanding the différence between "not possible" and "much harder".
In Rust, the code does not compile.
In C++ the code compile, but
... then the bug will be caught.
Yes it is possible, noone says the opposite. But you can't deny it's harder. And because its harder, more bugs get past review, most notably security bugs as demonstrated again and again in many studies. The
That's why I did not said it was impossible, just order of magnitude harder to catch in C++ compared to Rust.
To have asan finding the bug, you need to have a valid unit test, that has a similar enough workload. Otherwise you may not see the bug with asan if the vector doesn't grow (and thus
refwould still be valid, not triggering UB), leading to a production-only bug.Asan is a wonderfull tool, but you can't deny it's much harder to use and much less reliable than just running your compiler.