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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    Rich Felker‏ @RichFelker Sep 12

    Does C have cases where, for complete object types X, Y, and Z, X and Y are compatible, Y and Z are compatible, but X and Z are not compatible? (non-transitivity) If so, name one.

    11:39 AM - 12 Sep 2018
    • 1 Retweet
    • 1 Like
    • Mitchel Lewis👨🏻‍💻 the network is just an abstraction layer
    3 replies 1 retweet 1 like
      1. New conversation
      2. Alexander Monakov‏ @_monoid Sep 12
        Replying to @RichFelker

        typedef void (*X)(double); typedef void (*Y)(); typedef void (*Z)(int);

        1 reply 0 retweets 1 like
      3. Rich Felker‏ @RichFelker Sep 12
        Replying to @_monoid

        Yep, you can do it with function pointer types; I should have thought of that since I used it recently. Could rule it out with "in a strictly conforming program" I suppose.

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. New conversation
      2. Michael Foukarakis‏ @mfukar Sep 12
        Replying to @RichFelker

        Yes because compat is not transitive, but I'm not sure of an example. It might be something like: struct { int x, y; } foo( void ) { return ( struct { int x, y; } ){ 0 } ;} With X & Y in other translation units, same definition. Maybe.

        1 reply 0 retweets 1 like
      3. Rich Felker‏ @RichFelker Sep 12
        Replying to @mfukar

        Yep, the case I'm aware of is untagged struct/union types in different translation units (X,Z in TU1, Y in TU2) with identical members.

        1 reply 0 retweets 0 likes
      4. Michael Foukarakis‏ @mfukar Sep 12
        Replying to @RichFelker

        pic.twitter.com/NaZtHui7QX

        0 replies 0 retweets 0 likes
      5. End of conversation
      1. New conversation
      2. Stephen Checkoway‏ @stevecheckoway Sep 13
        Replying to @RichFelker

        VLA are apparently compatible with any array with compatible elements but fixed length arrays of different lengths are not.

        1 reply 0 retweets 0 likes
      3. Rich Felker‏ @RichFelker Sep 13
        Replying to @stevecheckoway

        Really? That seems unlikely..

        1 reply 0 retweets 0 likes
      4. Stephen Checkoway‏ @stevecheckoway Sep 13
        Replying to @RichFelker

        So claims https://en.cppreference.com/w/c/language/type#Compatible_types …

        0 replies 0 retweets 0 likes
      5. End of conversation

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