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Andy Wingo (wingo@mastodon.social)'s status on Tuesday, 02-Dec-2025 22:39:17 JST Andy Wingo

i never thought i would have nasal demons in my code, sobbed the compiler developer who voted for the introduction of nasal demons into people's code

In conversation about 9 months ago from mastodon.social permalink
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  Christine Lemmer-Webber (cwebber@social.coop)'s status on Tuesday, 02-Dec-2025 22:39:16 JST Christine Lemmer-Webber
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  @wingo I don't even know what nasal demons means but favoriting this post anyway
  
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  Christine Lemmer-Webber (cwebber@social.coop)'s status on Tuesday, 02-Dec-2025 22:41:35 JST Christine Lemmer-Webber
  in reply to
  - David Bremner
  @bremner I would legit never do that to @wingo
  
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  David Bremner (bremner@mathstodon.xyz)'s status on Tuesday, 02-Dec-2025 22:41:37 JST David Bremner
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  - Christine Lemmer-Webber
  @cwebber .oO(Is this more mansplaining bait from christine??) @wingo
  
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  Andy Wingo (wingo@mastodon.social)'s status on Tuesday, 02-Dec-2025 22:44:47 JST Andy Wingo
  in reply to
  - David Bremner
  - Christine Lemmer-Webber
  @cwebber @bremner lol you would so do that to me ;)
  
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  Christine Lemmer-Webber (cwebber@social.coop)'s status on Tuesday, 02-Dec-2025 22:44:47 JST Christine Lemmer-Webber
  in reply to
  - David Bremner
  @wingo @bremner honestly I'm the one that got "sure LMGTFY'ed" in this thread so I'm the one who got pwned
  Here it is for anyone else, I'm just not C(++)'ed enough apparently https://en.wikipedia.org/wiki/Undefined_behavior
  In conversation about 9 months ago permalink
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    Undefined behavior
    
    In computer programming, a program exhibits undefined behavior (UB) when it contains, or is executing code for which its programming language specification does not mandate any specific requirements. This is different from unspecified behavior, for which the language specification does not prescribe a result, and implementation-defined behavior that defers to the documentation of another component of the platform (such as the ABI or the translator documentation). In the C programming community, undefined behavior may be humorously referred to as "nasal demons", after a comp.std.c post that explained undefined behavior as allowing the compiler to do anything it chooses, even "to make demons fly out of your nose". Overview Some programming languages allow a program to operate differently or even have a different control flow from the source code, as long as it exhibits the same user-visible side effects, if undefined behavior never happens during program execution. Undefined behavior is the name of a list of conditions that the program must not meet. In the early versions of C, undefined behavior...

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