How expensive is integer-overflow trapping in C++?

Re:How expensive is integer-overflow trapping in C++? by masklinn on Friday September 25, 2020 @03:42AM (#24587529)

You’re you’re talking about the behaviour in C. Other langages are not C and can and do define other behaviours.

Overflow is neither wrapping nor UB in Swift, it’s an error. Overflow is never UB in Rust but it might be wrapping or a panic. Overflow doesn’t exist in Python or Erlang. I think overflow is IB in Haskell.

You get the point: that signed overflow is UB and unsigned wraps in C has no bearing on what other langages do.

Swift traps on overflow, regardless of signedness.

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Re:How expensive is integer-overflow trapping in C++? by MaxBarraclough on Friday September 25, 2020 @04:52AM (#24587919)

This thread is about C++.

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Re:How expensive is integer-overflow trapping in C++? by masklinn on Friday September 25, 2020 @11:23AM (#24590775)

This sub-thread's starting point was literally a comment on Swift's behaviour. Unless C++ has drastically changed and now abruptly aborts on overflow.

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Re:How expensive is integer-overflow trapping in C++? by MaxBarraclough on Friday September 25, 2020 @11:35AM (#24590903)

I think you have this confused with the subthread under alblue's comment.

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