I wanted to create a struct named "Filme" and include it in the main.rs, but I’ve been struggling with that. Here is the Filme.rs file: pub struct Filme{ pub nome: String, pub duracao: u8, pub categorias : String, } impl Filme{ pub fn new(nome:String, duracao:u8, categorias: String) -> Filme{ Filme { nome: nome, duracao: duracao,… Read More How to properly import structs in Rust?
I’m new to Rust and I’m trying to write down a simple example using loops the code is the following: fn main() { let exit: u8 = loop_break(20, 5); println!("loop_break exited with value {exit}"); let exit: u8 = loop_break(20, 35); println!("loop_break exited with value {exit}"); let exit: u8 = loop_break(20, 20); println!("loop_break exited with value… Read More simple program in Rust has compilation errors
was recently exploring the use of env_logger library in Rust, it’s a great library. I encountered, however, an issue that is related to a multithreaded scenario, where, if the logger is already initialized, the thread panics as it cannot re-initialize it. I’m getting this error thread ‘<unnamed>’ panicked at ‘Builder::init should not be called after… Read More env_logger initialized only once?
Is there a built in error type that just prints a message, but cannot do anything else? I don’t need to be able to know what the error is, I just want to print it to a log file. It will effectively be a silent panic, since the error is one severity down from ‘unrecoverable’.… Read More Built in error type that cannot be handled and just contains a message?
Here’s some code I have: fn my_func(i: i32) -> Result<i32, String> { match i { 42 => Ok(113), _ => Err("Can only use 42".to_string()) } } fn main() { let myvec = [1, 2, 42]; if myvec.iter().any(|i| my_func(*i).is_ok()) { println!("something was ok"); } else { println!("nothing was ok"); } } Instead of println!("something was ok");,… Read More If let expression within .iter().any
I’m trying to implement a trie in rust to learn the language, especially around recursive structures. In the process, I"m seeing that the add_word method gives me an error. The implementation is use std::array; #[derive(Default)] pub struct Trie { is_end: bool, pub children: [Option<Box<Trie>>; 26], } impl Trie { pub fn new() -> Box<Self> {… Read More how to fix error in trie implementation in rust?
In C, I can take a struct like figure here: struct point { int x, y; }; struct box { struct point left_top, right_bottom; }; struct figure { struct point points[100]; struct box bounding_box; }; and just treat it as an int array, which is very convenient in some cases. I wonder if Rust offers… Read More Treating a nested struct of the same leaf type as an array
I have a function that returns time elapsed. I had originally tried fn insert_test(Table: &mut HashMap<String,String>, items: &Vec<String>) -> std::time::Instant { But the compiler errored on ^^^^^^^^ expected struct `Instant`, found `u128` But the compiler tells me to use u128 instead But how would I know u128 ahead of time? https://doc.rust-lang.org/std/time/struct.Instant.html itself does not explicitly… Read More Rust function returning std::time::Instant
I am working on a course which uses automated tests. The input is given in the form of standard input and you then print the answers to standard output. As the input usually takes the form of a bunch of values of the same type separated by spaces and I don’t want to write the… Read More Generic return without generic argument
Hi I have just started to program in Rust. Here is my build.rs use std::fs::{File, self}; use std::io::Write; use std::os::unix::prelude::PermissionsExt; use std::env; use std::path::{Path, PathBuf}; fn main() { let out_dir = env::var_os("CARGO_MANIFEST_DIR").unwrap(); let dest_path: PathBuf = Path::new(&out_dir).join("target/release/Settings.toml"); println!("{:?}", dest_path.as_os_str()); let f = File::create(dest_path); f.as_ref() .unwrap() .write_all("largest_number = 7".as_bytes()) .unwrap(); set_permissions(f); } fn set_permissions(f: Result<File, std::io::Error>)… Read More Unable to set permissions in RUST