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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Patrick Walton‏ @pcwalton 16 Apr 2019
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      Patrick Walton Retweeted

      Is modern C++ even trying to be safer than C? https://twitter.com/fugueish/status/1118287189018730497 …

      Patrick Walton added,

      This Tweet is unavailable.
      5 replies 8 retweets 36 likes
    2. DanielMicay‏ @DanielMicay 16 Apr 2019
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      Replying to @pcwalton

      I find it to be the opposite. A lot of modern styles also encourage trying to be more efficient than the idiomatic C code with lots of dynamic allocations / copies. Most of the memory corruption bugs that I run into are in C++ despite there being about an equal amount of C code.

      3 replies 0 retweets 3 likes
    3. DanielMicay‏ @DanielMicay 16 Apr 2019
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      Replying to @DanielMicay @pcwalton

      There's a huge difference between the result of finding the bug too. I can usually fairly quickly come to an understanding of why the memory corruption bug occurs in C. On the other hand, it's often extremely difficult to unravel what goes wrong in many layers of C++ abstraction.

      1 reply 1 retweet 3 likes
    4. DanielMicay‏ @DanielMicay 16 Apr 2019
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      Replying to @DanielMicay @pcwalton

      I've found bugs involving weird C++ object oriented reference counting bugs where I've spent ages trying to resolve the issues and have yet to actually figure them out. I'm not even talking about non-deterministic issues like races. I can reproduce these 100% of the time.

      1 reply 0 retweets 1 like
    5. DanielMicay‏ @DanielMicay 16 Apr 2019
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      Replying to @DanielMicay @pcwalton

      The same applies when reporting the bugs upstream. It takes them ages to figure out some of these issues too. It's a very weird feeling being able to reproduce a bug, knowing that it's a use-after-free but even a team of people struggle to figure out what exactly is going wrong.

      1 reply 0 retweets 1 like
    6. DanielMicay‏ @DanielMicay 16 Apr 2019
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      Replying to @DanielMicay @pcwalton

      I've always disliked class inheritance, but it's particularly scary in C++. Chromium and Android have these ridiculously complex interactions with it. There's this object oriented inheritance-based reference counting design in legacy Android code that I particularly despite....

      1 reply 1 retweet 1 like
      Patrick Walton‏ @pcwalton 16 Apr 2019
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      Replying to @DanielMicay

      The sp<> templates? Those are gross, yeah… is there even any documentation for them?

      5:55 PM - 16 Apr 2019
      1 reply 0 retweets 0 likes
        1. New conversation
        2. DanielMicay‏ @DanielMicay 16 Apr 2019
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          Replying to @pcwalton

          Yes, those horrible things. They're using C++14 for newer code with the standard library used much more, but std::shared_ptr + lightweight references including iterators (which is how it's actually used) can end up ridiculously hard to debug too. The problem can be so far away.

          1 reply 0 retweets 0 likes
        3. DanielMicay‏ @DanielMicay 16 Apr 2019
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          Replying to @DanielMicay @pcwalton

          Once all kinds of fancy higher level inheritance and/or templates are involved, it gets so hard to unravel what is actually going on. The sp<...> reference counting is one of the most horrible things that I've ever had to deal with though. It makes me hate OOP and C++ so much.

          1 reply 0 retweets 0 likes
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