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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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    1. Rich Felker‏ @RichFelker 24 Feb 2016
      Replying to @int10h

      @int10h @whitequark 6.7.2.2¶4 "The choice of type is implementation-defined"

      2 replies 0 retweets 0 likes
    2. Alexander Cherepanov‏ @ch3root 25 Feb 2016
      Replying to @RichFelker

      @RichFelker @int10h @whitequark Why is it bad? I think there are 2 distinct uses of enums. 1) For constants. The type of enum isn't relevant

      1 reply 0 retweets 0 likes
    3. Alexander Cherepanov‏ @ch3root 25 Feb 2016
      Replying to @ch3root

      @RichFelker @int10h @whitequark 2) For real enumerated type without conversion to/from integers. The type isn't relevent too.

      2 replies 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker 25 Feb 2016
      Replying to @ch3root

      @ch3root @int10h @whitequark Because the ABI depends on the choice. For impls where the type depends on range of values it really sucks.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 25 Feb 2016

      @ch3root @int10h @whitequark Because adding additional enumeration values can change the ABI of your interface.

      4:33 PM - 25 Feb 2016
      • 3 Likes
      • always @ ( * ) William D. Jones whitequark
      2 replies 0 retweets 3 likes
        1. New conversation
        2. whitequark‏ @whitequark 25 Feb 2016
          Replying to @RichFelker

          @RichFelker @ch3root @int10h oh god that's even worse. I never considered that.

          1 reply 0 retweets 1 like
        3. Rich Felker‏ @RichFelker 25 Feb 2016
          Replying to @whitequark

          @whitequark @ch3root @int10h This is why C requires everything incl tag & set of consts to be identical to yield a "compat type" across TUs.

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. New conversation
        2. Alexander Cherepanov‏ @ch3root 25 Feb 2016
          Replying to @RichFelker

          @RichFelker @int10h @whitequark But the same is true for structs and unions. Adding a field will change the ABI.

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 25 Feb 2016
          Replying to @ch3root

          @ch3root @int10h @whitequark Formally, yes. In practice, not as long as you add at end & library is responsible for all allocation.

          1 reply 0 retweets 0 likes
        4. Alexander Cherepanov‏ @ch3root 25 Feb 2016
          Replying to @RichFelker

          @RichFelker @int10h @whitequark So, either add INT_MIN into each external enum or use plain int for vars.

          2 replies 0 retweets 0 likes
        5. Alexander Cherepanov‏ @ch3root 25 Feb 2016
          Replying to @ch3root

          @RichFelker @int10h @whitequark Hm, enums are permitted to be wider than int so only plain ints for ABIs.

          1 reply 0 retweets 0 likes
        6. whitequark‏ @whitequark 25 Feb 2016
          Replying to @ch3root

          @ch3root @RichFelker @int10h typical C apologism. "Here are 10 things you need to safely use X; since I can list them X is actually good."

          1 reply 0 retweets 1 like
        7. Alexander Cherepanov‏ @ch3root 25 Feb 2016
          Replying to @whitequark

          @whitequark @RichFelker @int10h There are several constructs. They have their pros and cons. Saying that enums are evil because they use\

          2 replies 0 retweets 0 likes
        8. Alexander Cherepanov‏ @ch3root 25 Feb 2016
          Replying to @ch3root

          @whitequark @RichFelker @int10h impl.-defined type is as good as saying that defines are evil because they are not scoped.

          1 reply 0 retweets 0 likes
        9. Alexander Cherepanov‏ @ch3root 25 Feb 2016
          Replying to @ch3root

          @whitequark @RichFelker @int10h And while at it: saying that C is evil bc it's not safe is as good as saying python is evil bc it's slow.

          0 replies 0 retweets 0 likes
        10. End of conversation

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