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Trait (default implementing (can call other in same trait (pub trait…

Trait

default implementing

pub trait Summary {
    fn summarize(&self) -> String {
        String::from("(Read more...)");
    }
}

impl Summart for NewsArticle {}

can call other in same trait

pub trait Summary {
    fn summarize_author(&self) -> String;

    fn summarize(&self) -> String {
        println!("read more from {}", self.summarize_author())
    }
}

trait bound

pub fn notify<T: Summary>(item: T) {
    println!("{}", item.summarize());
}

define

pub trait Summary {
    fn summarize(&self) -> String;
}

implementing

pub struct NewsArticle {
    pub headline: String,
    pub location: String,
    pub author: String,
    pub content: String,
}

impl Summary for NewsArticle {
    fn summarize(&self) -> String {
        println!("{}, by {} ({})", self.headline, self.author, self.location);
    }
}

conditionally implement method

struct Pair<T> {
    x: T,
    y: T,
}

impl<T> Pair<T> {
    fn new(x: T, y: T) -> self {
        self {
            x,
            y,
        }
    }
}

impl<T: PartialOrd + Display> Pair<T> {
    fn cmd_display(&self) {
        println!("some string");
    }
}