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@jonathanwork
Created April 11, 2024 20:05
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running simple demos
// use anyhow::Error;
trait NonDis {
fn foo() where Self: Sized {}
fn returns (&self ) -> Self where Self: Sized;
fn param(&self, other: Self) where Self: Sized {}
fn typed<T> ( &self, x : T) where Self: Sized {}
}
struct S;
impl NonDis for S {
fn returns(&self) -> Self where Self : Sized { S }
}
// fn say_hello(out: &mut dyn Write) -> std::io::Result<()> {
// out.write_all(b"hello world\n" ) ;
// out.flush()
// }
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)
}
}
pub fn notify(item : &impl Summary ) {
println!("breaking {}" , item.summarize())
}
fn main() {
let tweet = Tweet {
username: String::from("horse_ebooks"),
content: String::from(
"of course, as you probably already know, people",
),
reply: false,
retweet: false,
};
println!("1 new tw : {}" , tweet.summarize() ) ;
notify(&tweet)
}
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