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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Scare-a-dino Casket‏ @taradinoc 29 Oct 2013
      Replying to @cmuratori

      @cmuratori Is casting an out of range value to enum actually legal/defined behavior?

      1 reply 0 retweets 0 likes
    2. Casey Muratori‏ @cmuratori 29 Oct 2013
      Replying to @taradinoc

      @taradinoc It doesn't matter. The point is that it can easily happen, for example when reading off disk. So this warning is misguided.

      2 replies 0 retweets 0 likes
    3. Scare-a-dino Casket‏ @taradinoc 29 Oct 2013
      Replying to @cmuratori

      @cmuratori Warning for undefined behavior is pretty standard. Why not compare before casting?

      1 reply 0 retweets 0 likes
    4. Casey Muratori‏ @cmuratori 29 Oct 2013
      Replying to @taradinoc

      @taradinoc Because you may be doing it in an assertion. Ie., "assert that this enum is in range when I get it". That's extremely common.

      1 reply 0 retweets 0 likes
    5. Casey Muratori‏ @cmuratori 29 Oct 2013
      Replying to @cmuratori

      @taradinoc Now all of those would have to be casted to integer types first.

      1 reply 0 retweets 0 likes
    6. Scare-a-dino Casket‏ @taradinoc 29 Oct 2013
      Replying to @cmuratori

      @cmuratori The compiler can choose the size of the enum to match the values, so that comparison may not be meaningful.

      1 reply 0 retweets 0 likes
    7. Casey Muratori‏ @cmuratori 29 Oct 2013
      Replying to @taradinoc

      @taradinoc It _can_, but it _did not_. The largest value allowed for functioning of the software in this case was 64.

      1 reply 0 retweets 0 likes
    8. Casey Muratori‏ @cmuratori 29 Oct 2013
      Replying to @cmuratori

      @taradinoc So it warned on "enum < 64", even though it was not using some magical hardware 6-bit type for future operations.

      3 replies 0 retweets 0 likes
    9. Scare-a-dino Casket‏ @taradinoc 29 Oct 2013
      Replying to @cmuratori

      @cmuratori Such warnings tell you that your program may work unexpectedly on SOME conforming compiler, not necessarily the one you're using.

      1 reply 0 retweets 0 likes
    10. Casey Muratori‏ @cmuratori 29 Oct 2013
      Replying to @taradinoc

      @taradinoc No, it does not tell you that at all. There is no case where this comparison will result in unexpected behavior of the program.

      1 reply 0 retweets 0 likes
      Casey Muratori‏ @cmuratori 29 Oct 2013

      @taradinoc It's another in the long string of new "warnings" that often warn about things that are usually used _correctly_.

      9:16 AM - 29 Oct 2013
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Casey Muratori‏ @cmuratori 29 Oct 2013
          Replying to @cmuratori

          @taradinoc Sure, someone _could_ use the comparison incorrectly, but someone could use _anything_ incorrectly.

          1 reply 0 retweets 0 likes
        3. Casey Muratori‏ @cmuratori 29 Oct 2013
          Replying to @cmuratori

          @taradinoc If that was the criteria, the compiler should be warning you about a + b because it "could overflow".

          0 replies 0 retweets 0 likes
        4. End of conversation

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