slotmap
safety-dance
slotmap | safety-dance | |
---|---|---|
14 | 8 | |
1,039 | 518 | |
- | 0.0% | |
3.4 | 0.0 | |
2 months ago | about 2 years ago | |
Rust | ||
zlib License | Apache License 2.0 |
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slotmap
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Tree Borrows - A new aliasing model for Rust
It looks like .get_disjoint_mut() from slotmap failed under stacked borrows, but seems to pass under tree borrows
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Indexing vs Smart Pointers
I think slotmap is meant to solve this exact issue. Basically when you insert into a collection you get an Id:Version tuple as key. When you reuse a slot, next time the key will be Id:Version+1 and when you try to access the removed value by using Id:Version, it will return None. You can think about it as delayed invalidation.
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Hey Rustaceans! Got a question? Ask here (5/2023)!
Dunno about existing implementations, but it looks like it's a feature they'd accept: https://github.com/orlp/slotmap/issues/73
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Unsafe is a bad practice?
It's actually quite easy.
- Rust is more portable than C for pngquant/libimagequant
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Hey Rustaceans! Got an easy question? Ask here (50/2021)!
You can use either slot map or slab to side step rust borrow checker. Example https://github.com/orlp/slotmap/blob/master/examples/rand_meld_heap.rs
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Rust data structures with circular references
I don't know, only have some theories.
1. The name isn't particularly catchy or descriptive. It is the correct name for the data structure, but not too many people know the data structure.
2. People don't even know what they're missing. It's not a very Google-able problem to begin with. Slotmap provides an interesting solution to (circular) ownership and safe allocator / weak pointer design problems, but people don't recognize that they're having them or that slotmap could help.
As an example of this, the doubly linked list example (https://github.com/orlp/slotmap/blob/master/examples/doubly_...) can safely remove nodes from the linked list given their handle, in O(1), even from the middle, completely safely and correctly, even in the presence of double deletions or ABA memory re-use. You can't replicate this with just pointers, without introducing heavy refcounting solutions.
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Is it possible to write anything using 100% safe Rust?
Nope, it's perfectly safe: https://github.com/orlp/slotmap/blob/master/examples/doubly_linked_list.rs.
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Syncing HashMap values amongst User
I think keeping the relationship between child and parent elements in the node graph might be better accommodating better via a psuedo-ECS system, see https://www.reddit.com/r/rust/comments/cnjhup/idiomatic_way_to_reference_parent_struct/. The https://github.com/orlp/slotmap crate looks promising. I think I'm just going to ditch the global shared HashMap in favor of something that can better accommodate child/parent relations.
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Beginner question: does it become easier to write datastructures with complex ownership semantics?
I think the slotmap crate is similar to what you're trying to write: https://github.com/orlp/slotmap
safety-dance
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The WebP 0day
[2]: https://github.com/rust-secure-code/safety-dance
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Do you ever use unsafe { .. } when not implementing custom data structures or interacting with external C code?
The most "virtuous"/desirable statement in this topic is probably the "100% safe code now - while being faster than the C version!" on the rust-secure-code/safety-dance entry for miniz_oxide.
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Good example of high performance Rust project without unsafe code?
According to the rust-secure-code/safety-dance trophy case, their audit left miniz_oxide 100% safe and faster than the C version.
- Hey Rustaceans! Got an easy question? Ask here (50/2021)!
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Rust Vs. Go Random Observations
Efforts that don't try to pick winners, but just to help packages that already exist, like Rust Safety Dance and developing tools like Miri. (And that dependency-improving sprint, the name of which eludes me, but which was mentioned in TWIR a while ago.)
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Fast and robust e-mail parsing library for Rust
I'm similarly iffy on using a parser for something as web-exposed as e-mail which uses unsafe for a performance boost without a thumbs-up from someone like /u/Shnatsel and the Safety Dance.
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Weird architectures weren't supported to begin with
Since this all happened, the safety-dance project has come into existence, which aims to channel the mob into doing useful things, not just piling onto someone who's got different views on what they want from Rust.
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Is there anyone looking for GSOC student for a Rust project ? (or just a contributor for a project ?)
https://github.com/rust-secure-code/safety-dance is always looking for contributors.
What are some alternatives?
rust-typed-arena - The arena, a fast but limited type of allocator
stdx - The missing batteries of Rust
slab - Slab allocator for Rust
ttf-parser - A high-level, safe, zero-allocation TrueType font parser.
multi_mut - Methods on HashMap and BTreeMap for safely getting multiple mutable references to the contained values.
actix-net - A collection of lower-level libraries for composable network services.
rust - Rust for the xtensa architecture. Built in targets for the ESP32 and ESP8266
json-benchmark - nativejson-benchmark in Rust
sandbox - A sand simulation game
nomicon - The Dark Arts of Advanced and Unsafe Rust Programming
image-png - PNG decoding and encoding library in pure Rust