| pub trait Summary { |
| fn summarize(&self) -> String; |
| } |
| |
| pub struct NewsArticle { |
| pub headline: String, |
| pub location: String, |
| pub author: String, |
| pub content: String, |
| } |
| |
| impl Summary for NewsArticle { |
| fn summarize(&self) -> String { |
| format!("{}, by {} ({})", self.headline, self.author, self.location) |
| } |
| } |
| |
| pub struct Tweet { |
| pub username: String, |
| pub content: String, |
| pub reply: bool, |
| pub retweet: bool, |
| } |
| |
| impl Summary for Tweet { |
| fn summarize(&self) -> String { |
| format!("{}: {}", self.username, self.content) |
| } |
| } |
| |
| // ANCHOR: here |
| fn returns_summarizable() -> impl Summary { |
| Tweet { |
| username: String::from("horse_ebooks"), |
| content: String::from( |
| "of course, as you probably already know, people", |
| ), |
| reply: false, |
| retweet: false, |
| } |
| } |
| // ANCHOR_END: here |
