Rust Programming !rust@lemmy.ml

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New Release 1.6.0 of Persy single file embedded storage is out

Persy is a single file transactional embedded storage, is scope is become a base of persistent databases implementations or for simple low level database to embed in application.

This is a new minor release 1.6.0 that include a simple feature that allow to create snapshots from the commit of a transaction, release post with all details here: https://persy.rs/posts/persy-1.6.html

This is what I've found:

In C and C++, two different operators are used for calling methods: you use . if you’re calling a method on the object directly and -> if you’re calling the method on a pointer to the object and need to dereference the pointer first. In other words, if object is a pointer, object->something() is similar to (*object).something().

What about Rust?

Rust doesn’t have an equivalent to the -> operator. Instead, Rust has what is called automatic referencing and dereferencing.

In other words, the following are the same:

p1.distance(&p2); (&p1).distance(&p2); Note: this automatic referencing behavior works because methods have a clear receiver-the type of self. Given the receiver and name of a method, Rust can figure out definitively whether the method is reading (&self), mutating (&mut self), or consuming (self).

I am not sureI understood the note correctly, what does it mean that there is a clear receiver? Also, doesn't Rust actually have an operator for derefer

axum is an ergonomic and modular web framework built with Tokio, Tower, and Hyper

It seems quite clear that rust users use hyper but few of them want to work on making it work for a C project like curl, and among existing curl users there is virtually no interest in hyper. The overlap in the Venn diagram of the two universes is not big enough.

Hello,

I have started learning Rust. I have only made a fibonaci series program so far but I would make more complex program as I progress in learning Rust :D

axum is a web application framework that focuses on ergonomics and modularity.

Hey! If you're using axum, I would be happy if you tried the first release candidate of the upcoming v0.8.0, and shared any feedback you have. That's all :)

I am trying to understand the std::process::Termination trait.

As I'm not really used to read libraries, I took this as a challenge to try understanding a bit more about how to read them as well.

I think trying to build a library would give me better understanding, but for now...

Termination is quite easy, from the trait page I can see that this trait has single method: report, which returns an ExitCode.

 undefined

    
pub trait Termination {
    fn report(self) -> ExitCode;
}

  

But when I try to dig in further and i read the page related to ExitCode, it confuses me a bit.

ExitCode is a struct, therefore it behaves like a type with many fields which define the types contained in the struct.

I cannot really understand what's the point of this type.. I don't see any fields defined in the struct and this part confuses me a lot:

The standard library provides the canonical SUCCESS and FAILURE exit codes as well as From<

I was recently furloughed from work, so in between job applications, I decided to polish off Sonarr support in my Managarr TUI. Thus, I'm very proud to announce the beta release of Managarr with Sonarr support!

TL;DR: Managarr is a TUI and CLI for managing your Servarr instances. As of now, it now supports both Radarr and Sonarr and all the features that are available in the UI are also available in the CLI for scripting and additional automation.

The new version has the following features:

• Wider platform support (Windows, Mac, Linux, x86_64 and arm64)
• View your library, downloads, blocklist, episodes
• View details of a specific series, or episode including description, history, downloaded file info, or the credits
• View your host and security configs from the CLI to programmatically fetch the API token, among other settings
• Search your library
• Add series to your library
• Delete series, downloads, indexers, root folders, and epi

cross-posted from: https://lemmy.world/post/22673996

This mod is written in an unconventional way: it is written in Rust. The Rust code is here. It uses JNI and JVMTI to interact with Java objects. The only Java code in this mod is for loading the compiled native binary into memory.

Hey there! I'm starting my journey to the learning of Rust. I have been coding only with Python for 6 years now and last year, I had to code in JavaScript using VueJS for my job (I never workedeon frontend).

Now, I have a personal project idea which I'd like to create. I could do it in Python but I want to learn Rust. I've looked up on the Internet but may be some answers are too old or someone here can point me to something I haven't seen yet.

What do you recommand for webdev? I guess I need to code the back in Rust and use a JavaScript framework for the front. My backend will be for a REST API (my app will need to manage users and organisations).

Bonus question if you can recommend a BDD framework. I think there is something named Cucumber. Is it good?

Thanks a lot ♥️🦀

Hello,

I was playing around with rust and wondered if I could use const generics for toggling debug code on and off to avoid any runtime cost while still being able to toggle the DEBUG flag during runtime. I came up with a nifty solution that requires a single dynamic dispatch which many programs have anyways. It works by rewriting the vtable. It's a zero cost bool!

Is this technique worth it?

Probably not.

It's funny though.

Repo: https://github.com/raldone01/runtime_const_generics_rs/tree/v1.0.0

Full source code below:

 rust

    
use std::mem::transmute;
use std::sync::atomic::AtomicU32;
use std::sync::atomic::Ordering;

use replace_with::replace_with_or_abort;

trait GameObject {
  fn run(&mut self);
  fn set_debug(&mut self, flag: bool) -> &mut dyn GameObject;
}

trait GameObjectBoxExt {
  fn set_debug(self: Box<Self>, flag: bool) -> Box<dyn GameObject>;
}

impl GameObjectBoxExt for dyn GameObject {
  fn set_debug(self: Box<Self>, flag: bool) -> Box<dyn GameObject> {
    unsafe
  

In python, when you install stuff with pip, it is recommended to use a venv, to avoid breaking dependencies for a program when uninstalling another one, or when two programs need two different versions of the same dependence.

I was wondering if with Rust is the same, or if Cargo manages it all on its own (kind of like apt does), and I shouldn't care about it.

Also since I know Linux kernel is using some Rust, isn't there a risk of breaking my system if I uninstall a program that need some deps that the system itsel needs?

TLDR: Searching for person holding professor position to officially act as a committee member on a US PhD defense

Hi all,

I'm in a non CS field. I'm doing PhD in hydrology and I'm good at Geospatial Analysis, data analysis, visualization, modeling and such. I really like programming and have been making open source programs, contributing to open source programs and such. And have been learning rust for last 2 years.

For my PhD dissertation I'm doing a project where I'll be using Rust to make a program with compiled plugin system that can do generalized river related tasks including data analysis and visualization. I have professors in GIS and hydrology to guide those aspects, but I don't have anyone on software side to ask questions, or to look at my work. I tried emailing some people I have seen with open source projects on GIS+rust, but no response.

I'm ideally looking for someone that holds a professor position for my committee who is good with either rust, GIS related algori

I have two functions that are similar but can fail with different errors:

 rust

    
#[derive(Debug, thiserror::Error)]
enum MyError {
  #[error("error a")]
  MyErrorA,
  #[error("error b")]
  MyErrorB,
  #[error("bad value ({0})")]
  MyErrorCommon(String),
}

fn functionA() -> Result<String, MyError> {
  // can fail with MyErrorA MyErrorCommon
  todo!()
}

fn functionB() -> Result<String, MyError> {
  // can fail with MyErrorB MyErrorCommon
  todo!()
}

  

Is there an elegant () way I can express this?

If I split the error type into two separate types, is there a way to reuse the definition of MyErrorCommon?

() by "elegant" I mean something that improves the code - I'm sure one could define a few macros and solve that way, but I don't want to go there

edit: grammar (rust grammar)

I've only been coding with Python/Javascript since I started my career. I do APIs and websites frontend. I don't really understand what is interesting in learning an other language. For example, I could learn Ruby, but I'd do the same thing I already do.

Rust, C/C++ tho seem to me to be languages to code other things. Hence my question : what do you code? If possible, make distinction between personal projects and professional projects.