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sgrif's profile
Miss Dada 🏳️‍⚧️
Miss Dada 🏳️‍⚧️
Miss Dada  🏳️‍⚧️
@sgrif

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Miss Dada  🏳️‍⚧️

@sgrif

Co lead of the http://crates.io  team. Creator of @dieselframework. Former host of @_bikeshed and @_yakshave. Former Rails comitter. Enby. they/them

Albuquerque, NM
patreon.com/seantheprogram…
Joined November 2008

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    1. Miss Dada  🏳️‍⚧️‏ @sgrif Aug 18
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      Replying to @ManishEarth @withoutboats

      Where is this thread?

      3 replies 0 retweets 3 likes
    2. Miss Dada  🏳️‍⚧️‏ @sgrif Aug 18
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      Replying to @sgrif @ManishEarth @withoutboats

      I found it. Wow that is a take. I am surprised CStr::as_ptr is still around letting folks get bit by this. Wasn't there talk of deprecating it in favor of a method that returns a reference at some point?

      1 reply 0 retweets 7 likes
    3. CryZe‏ @CryZe107 Aug 18
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      Replying to @sgrif @ManishEarth @withoutboats

      I'd argue CStr / CString should be deprecated entirely and replaced with safe types that are FFI compatible. There shouldn't be a need for any raw pointers at all.

      1 reply 0 retweets 3 likes
    4. Manish‏ @ManishEarth Aug 18
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      Replying to @CryZe107 @sgrif @withoutboats

      No. I don't think that works. As someone who has written a LOT of ffi, you need these kinds of types and I'm not sure how to make these more FFI safe in the first place

      1 reply 0 retweets 3 likes
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    6. Manish‏ @ManishEarth Aug 18
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      Replying to @withoutboats @CryZe107 @sgrif

      but it's not an &c_char? But yes, having safer bindings using pointers works. you still need the raw stuff a lot

      2 replies 0 retweets 2 likes
    7. Manish‏ @ManishEarth Aug 18
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      Replying to @ManishEarth @withoutboats and

      you can have safer ffi -- I did this kind of thing extensively in gecko where the extern API had borrowed references -- but that doesn't obviate the need for things like CString

      1 reply 0 retweets 1 like
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    9. Manish‏ @ManishEarth Aug 18
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      Replying to @withoutboats @CryZe107 @sgrif

      I was responding to a tweet contending that we should get rid of CString. I didn't say the libc thing couldn't be safer. I totally agree your thing works on that angle. Again, I used that same trick a million times in Stylo

      2 replies 0 retweets 1 like
    10. Lokathor‏ @Lokathor Aug 18
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      Replying to @ManishEarth @withoutboats and

      Having a &c_char value and then sending that to C code which expects to read the starting char as well as following chars until the null will give UB because it'll end up using pointers off the end of the object.

      2 replies 0 retweets 1 like
      Miss Dada  🏳️‍⚧️‏ @sgrif Aug 18
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      Replying to @Lokathor @ManishEarth and

      I don't think `&` implies anything different than `*const` does WRT object size

      6:56 AM - 18 Aug 2020
      1 reply 0 retweets 0 likes
        1. New conversation
        1. CryZe‏ @CryZe107 Aug 18
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          Replying to @sgrif @Lokathor and

          I've actually been wondering that too. It at least to LLVM is a hint that at least sizeof(T) many bytes are safely derefenceable, but idk if anything beyond that is strictly UB

          1 reply 0 retweets 0 likes
        2. Lokathor‏ @Lokathor Aug 18
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          Replying to @CryZe107 @sgrif and

          It doesn't have a different memory repr, but it does have narrowed provenance for the pointer you get. That's why the as_ptr method for slices first makes *const [T] and then makes *const T, in that very specific ordering. Sounds stupid, but RalfJ assures me it's true.

          1 reply 0 retweets 2 likes
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