4.7.1 解答

Tue, 11 Aug 2026 11:30:00 +0800

译文 · 基于 Comprehensive Rust

原文链接: https://google.github.io/comprehensive-rust/generics/solution.html

4.7.1 解答

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// Copyright 2023 Google LLC
// SPDX-License-Identifier: Apache-2.0
use std::cmp::Ordering;

fn min<T: Ord>(l: T, r: T) -> T {
 match l.cmp(&r) {
 Ordering::Less | Ordering::Equal => l,
 Ordering::Greater => r,
 }
}

#[test]
fn integers() {
 assert_eq!(min(0, 10), 0);
 assert_eq!(min(500, 123), 123);
}

#[test]
fn chars() {
 assert_eq!(min('a', 'z'), 'a');
 assert_eq!(min('7', '1'), '1');
}

#[test]
fn strings() {
 assert_eq!(min("hello", "goodbye"), "goodbye");
 assert_eq!(min("bat", "armadillo"), "armadillo");
}

4.7 练习：泛型 `min` on 编程那些事儿

4.7.1 解答

4.7.1 解答