gw_rust_programming_tutorial/chapter_10/
test_traits.rs

1//生命一个trait,默认实现
2pub trait Summary {
3    fn summarize(&self) -> String{
4        String::from("(Read more...)")
5    }
6}
7
8//为类型实现 trait
9pub struct NewsArticle {
10    pub headline: String,
11    pub location: String,
12    pub author: String,
13    pub content: String,
14}
15
16//为NewsArticle实现trait Summary
17impl Summary for NewsArticle {
18    fn summarize(&self) -> String {
19        format!("{}, by {} ({})", self.headline, self.author, self.location)
20    }
21}
22
23pub struct Tweet {
24    pub username: String,
25    pub content: String,
26    pub reply: bool,
27    pub retweet: bool,
28}
29
30//Tweet Summary
31impl Summary for Tweet {
32    fn summarize(&self) -> String {
33        format!("{}: {}", self.username, self.content)
34    }
35}
36pub fn test_trait_fn()
37{
38    let tweet = Tweet {
39        username: String::from("horse_ebooks"),
40        content: String::from("of course, as you probably already know, people"),
41        reply: false,
42        retweet: false,
43    };
44    
45    //类型Tweet实现了trait Summary，可以直接调用summarize
46    println!("1 new tweet: {}", tweet.summarize());
47}
48
49use std::fmt::Display;
50
51struct Pair<T> {
52    x: T,
53    y: T,
54}
55
56impl<T> Pair<T> {
57    fn new(x: T, y: T) -> Self {
58        Self {
59            x,
60            y,
61        }
62    }
63}
64
65impl<T: Display + PartialOrd> Pair<T> {
66    fn cmp_display(&self) {
67        if self.x >= self.y {
68            println!("The largest member is x = {}", self.x);
69        } else {
70            println!("The largest member is y = {}", self.y);
71        }
72    }
73}
74
75// impl<T: Display> ToString for T {
76//     // --snip--
77//     println!("ssssssssssss");
78//     String::from("asdasdasd")
79// }
gw_rust_programming_tutorial/chapter_10/test_traits.rs

gw_rust_programming_tutorial/chapter_10/
test_traits.rs
