slotmap
cross
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slotmap | cross | |
---|---|---|
14 | 118 | |
1,031 | 5,909 | |
- | 3.8% | |
3.4 | 9.2 | |
about 2 months ago | 10 days ago | |
Rust | Rust | |
zlib License | Apache License 2.0 |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
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
cross
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Is statically compiling against glibc possible?
To compile a program with musl on a glibc system you can use cross-rs!
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How to cross Compile on Debian for: Mac / FreeBSD / OpenBSD / Android ... ?
I cross compile to Mac, bsd, windows, etc cross ... Works great for me with either docker or podman.
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Compiling against specific version glibc
If docker is available for you, https://github.com/cross-rs/cross is another and reliable way to solve this kind of problem. I do use it regularly.
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Transitioning to Rust as a company
We are using https://github.com/cross-rs/cross.
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A guide to cross-compilation in Rust
There is some built-in support in rustc for cross-compiling, but getting the build to actually work can be tricky due to the need for an appropriate linker. Instead, we’re going to use the Cross crate, which used to be maintained by the Rust Embedded Working Group Tools group.
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Is there a definitive guide on cross-compiling with OpenSSL?
I have used cross before to cross compile from Linux to other Linux. It has a section on it's wiki about this. Maybe that could be of help.
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Docker ARMv7 Alpine Rust builder
You can use cross to build your application and copy the artifacts into an alpine armv7 container. It would also build faster due to using cross compilation rather than QEMU.
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Compiling Linux to Mac in CI/CD
Looks like cross is the easiest way to get something cross-compiled but its Mac support is blocked behind building your own build image. Even that repo says that it might be broken.
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How to you develop in containers?
Bonus: if you’re working with Rust and doing a lot of cross platform stuff, check out cross. It runs QEMU in docker so you can run tests on a bunch of different emulated targets easily- literally a one line setup, it’s kind of magical.
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What are some stuff that Rust isn't good at?
It's also not as naturally cross-compilable as Go, though that's partly a side-effect of not accepting being a semi-closed ecosystem to achieve that and cross exists as a stop-gap while things like cargo-zigbuild explore less drastic options.
What are some alternatives?
rust-typed-arena - The arena, a fast but limited type of allocator
dockcross - Cross compiling toolchains in Docker images
slab - Slab allocator for Rust
termux-adb-fastboot - android adb-fastboot tools for termux
multi_mut - Methods on HashMap and BTreeMap for safely getting multiple mutable references to the contained values.
opencv-rust - Rust bindings for OpenCV 3 & 4
rust - Rust for the xtensa architecture. Built in targets for the ESP32 and ESP8266
rusqlite - Ergonomic bindings to SQLite for Rust
stdx - The missing batteries of Rust
plotters - A rust drawing library for high quality data plotting for both WASM and native, statically and realtimely 🦀 📈🚀
nomicon - The Dark Arts of Advanced and Unsafe Rust Programming
homebrew-macos-cross-toolchains - macOS cross compiler toolchains