To be precise, it's implementation-defined whether it's undefined behavior, prio... | Hacker News

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		layer8 on Jan 18, 2021 \| parent \| context \| favorite \| on: That XOR Trick (2020) To be precise, it's implementation-defined whether it's undefined behavior, prior to C11. You are right that in C11, if uintptr_t is used to store the xored value, behavior is defined.

loeg on Jan 20, 2021 [–]

Implementation-defined whether it's UB or not is still implementation-defined, I think.

Which change are you thinking of in C11? (I'm just curious.) Thanks!

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