| 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 |
| pub fn notify(item: impl Summary) { |
| println!("Breaking news! {}", item.summarize()); |
| } |
| // ANCHOR_END: here |
