learn_rust_demo/lib.rs
pub trait Summary {
fn summarize(&self) -> String {
String::from("Loading...")
}
}
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!("我是Tweet的summarize: {}", self.username)
}
}