id = rand::random::().to_string(); sqlx::query("INSERT INTO sessions (session_id, user_id) VALUES ($1, $2) ON CONFLICT (user_id) DO UPDATE SET session_id = EXCLUDED.session_id") .bind(&session_id) .bind(res.get::<i32, _>("id")) .execute(&state.postgres) ...
cmp(&secret_number) { Ordering::Less => println!("Too small!"), Ordering::Greater => println!("Too big!"), Ordering::Equal => println!("You win!"), } } 上面代码编译会报错 $ cargo build Compiling libc v0.2.86 Compiling getrandom v0.2.2 Compiling cfg-if v1.0.0 Compiling ppv-...
使用 rand crate 生成一个随机数字extern crate rand;use rand::Rng;fn main() { let mut rng = rand::thread_rng(); // random number generator let x = rng.get::<i32>(); // ignore the ::<i32> // this just tells the rng to make // an i32. println!("x: {}”,...
A Rust library for random number generation. Rust1.7k437 getrandomgetrandomPublic A small cross-platform library for retrieving random data from (operating) system source Rust329195 bookbookPublic The Rust Rand Book Shell5622 rngsrngsPublic
getrandom:为Rust提供的一个简单的跨平台API,用于获取随机数。 libc:提供Rust绑定到本地C库(例如libc)的一个底层(unsafe)接口。 whoami:一个用于检索当前用户和环境信息(如用户名、主机名)的库。 signal-hook:用于处理Unix信号的Rust库。 ctrlc:提供简单的方法来处理用户输入Ctrl-C(中断信号)的Rust库。 os_info...
//github.com/lettre/lettrelettre = "0.10.3"# random number generator (for creating a session id) - https://github.com/rust-random/randrand = "0.8.5"# used to be able to deserialize structs from JSON - https://github.com/serde-rs/serdeserde = { version = "1.0.152", features =...
let num = 10 * get_random_number(); // num is an `i32`let num = num.to_string(); // num has been shadowed and is now a `String`在 Rust 中，这种模式被称为 遮蔽 （shadowing）。您将在许多 Rust 代码库中看到这种很常见的模式。它的工作原理是：每次使用 let 关键字时，Rust 都会在...
println!('随机数: {}', random_number); // 生成一个随机的布尔值 let random_bool = rng.gen_bool(0.5); println!('随机布尔值: {}', random_bool);} 总结 以上介绍的十个 Rust 核心库只是 Rust 生态系统中众多优秀库的冰山一角。随着 Rust 语言的不断发展,相信会有更多功能强大、易于使用的库涌现...
Compiling getrandom v0.2.8 Compiling rand_core v0.6.4 Compiling rand_chacha v0.3.1 Compiling rand v0.8.5 Compiling guessing_game v0.1.0 (/doc/jiangxiaoqing/rust/chapter2/guessing_game) Finished dev [unoptimized + debuginfo] target(s) in 4.55s ...
Compiling getrandom v0.2.8 Compiling rand_core v0.6.4 Compiling rand_chacha v0.3.1 Compiling rand v0.8.5 Compiling guessing_game v0.1.0 (/Users/qiaopengjun/rust/guessing_game) Finished dev [unoptimized + debuginfo] target(s)in1.08s