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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. Tyler Glaiel‏Verified account @TylerGlaiel Jul 5
      Replying to @TylerGlaiel @cmuratori @scottmichaud

      more commonly I was just using my own set of containers that operated on objects that didn't need to have destructors called, and can be memcpy'd. c++20 concepts make it impossible for me to accidentally put an incompatible type into one of those, so there's that as well

      1 reply 0 retweets 1 like
    2. Scott Michaud‏ @scottmichaud Jul 5
      Replying to @TylerGlaiel @cmuratori

      It's perfectly fine to use your own containers. That's still RAII.

      1 reply 0 retweets 0 likes
    3. Scott Michaud‏ @scottmichaud Jul 5
      Replying to @scottmichaud @TylerGlaiel @cmuratori

      My main annoyance about std:: containers is that their reallocation process is "Allocate" "Copy (either by moving each element, or memcpy the block if trivially constructible)" "I deallocate old". If allocators supported reallocate, then I could be smart about alloc location.

      1 reply 0 retweets 0 likes
    4. Scott Michaud‏ @scottmichaud Jul 5
      Replying to @scottmichaud @TylerGlaiel @cmuratori

      That's not really an issue for what I typically work on, but, if it was, then I'd say "Sure, make your own container". Still RAII. The problem is when people don't use a container, and hand-roll raw-malloc/free all over their application logic.

      2 replies 0 retweets 0 likes
    5. Tyler Glaiel‏Verified account @TylerGlaiel Jul 5
      Replying to @scottmichaud @cmuratori

      "and hand-roll raw-malloc/free all over their application logic" idk I think this is a strawman, I see this in C libraries sometimes, almost never in C++ libraries

      2 replies 0 retweets 0 likes
    6. Tyler Glaiel‏Verified account @TylerGlaiel Jul 5
      Replying to @TylerGlaiel @scottmichaud @cmuratori

      cause all you need to avoid that in 99% of cases is to just use some kind of container

      1 reply 0 retweets 0 likes
    7. Scott Michaud‏ @scottmichaud Jul 5
      Replying to @TylerGlaiel @cmuratori

      I think we might have different ideas of what RAII is. I just mean, like, have a container that manages resources, and put that container as a by-value member (or use directly). (See: Red arrow) It could be a std:: container. It could be your own container. Doesn't matter.pic.twitter.com/JZnHBobu1m

      2 replies 0 retweets 0 likes
    8. Tyler Glaiel‏Verified account @TylerGlaiel Jul 5
      Replying to @scottmichaud @cmuratori

      reading the wikipedia article makes it sound like its a little more specific than just "constructors and destructors exist"

      1 reply 0 retweets 0 likes
    9. Scott Michaud‏ @scottmichaud Jul 5
      Replying to @TylerGlaiel @cmuratori

      My usage, and the usage that I've seen thus far, is basically just "constructors and destructors exist" (and the impact it has on by-value variables -- class members are destroyed in reverse-order, etc.).

      1 reply 0 retweets 1 like
    10. Casey Muratori‏ @cmuratori Jul 5
      Replying to @scottmichaud @TylerGlaiel

      Right, and this is not good.

      1 reply 0 retweets 1 like
      Casey Muratori‏ @cmuratori Jul 5
      Replying to @cmuratori @scottmichaud @TylerGlaiel

      If you have a per-member destructor, something has gone wrong. Anything a computer does one-by-one means the architecture has failed, unless there is literally only one of that thing ever :)

      4:43 PM - 5 Jul 2021
      • 8 Likes
      • Axel Gneiting Ivan Braidi Jonathan Evraire mud jack Victor Caleis Rob Aley
      2 replies 0 retweets 8 likes
        1. New conversation
        2. Tyler Glaiel‏Verified account @TylerGlaiel Jul 5
          Replying to @cmuratori @scottmichaud

          yeah I remember adding an allocator into the one system I had that had a ton of creation+destruction of objects (animation) years ago, noticing no difference in performance, and just going back to malloc again...

          1 reply 0 retweets 0 likes
        3. Tyler Glaiel‏Verified account @TylerGlaiel Jul 5
          Replying to @TylerGlaiel @cmuratori @scottmichaud

          but the issue was most of those objects had other objects that were using malloc inside their constructor/destructor (vectors and strings and some other stuff) so I was hitting it a bunch anyway

          1 reply 0 retweets 1 like
        4. Show replies
        1. New conversation
        2. Scott Michaud‏ @scottmichaud Jul 5
          Replying to @cmuratori @TylerGlaiel

          The computer doesn't necessarily do things one-by-one, though. For example, a chess solver could have a chessboard, which has two vectors of pieces, one for team 1, one for team 2. Each piece could be POD with a type ID (ex: 1 for pawn) and a coordinate.

          1 reply 0 retweets 0 likes
        3. Scott Michaud‏ @scottmichaud Jul 5
          Replying to @scottmichaud @cmuratori @TylerGlaiel

          Conceptually, what's destroyed? Up to 16 pieces, two vectors, and a chessboard. What's actually done? Two frees and a stack frame pop.

          2 replies 0 retweets 0 likes
        4. Show replies

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