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-rwxr-xr-xrust-book/traits/src/main.rs114
1 files changed, 114 insertions, 0 deletions
diff --git a/rust-book/traits/src/main.rs b/rust-book/traits/src/main.rs
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+++ b/rust-book/traits/src/main.rs
@@ -0,0 +1,114 @@
+use std::fmt::Display;
+
+struct Pair<T> {
+ x: T,
+ y: T,
+}
+
+impl<T> Pair<T> {
+ fn new(x: T, y: T) -> Self {
+ Self {
+ x,
+ y,
+ }
+ }
+}
+
+impl<T: Display + PartialOrd> Pair<T> {
+ fn cmp_display(&self) {
+ if self.x >= self.y {
+ println!("{}", self.x);
+ }
+ else {
+ println!("{}", self.y);
+ }
+ }
+}
+
+pub trait Summary {
+ fn summarize(&self) -> String {
+ format!("(read more from {}...)", self.summarize_author())
+ }
+
+ fn summarize_author(&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)
+// }
+
+ fn summarize_author(&self) -> String {
+ format!("{}", self.author)
+ }
+
+}
+
+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)
+// }
+
+ fn summarize_author(&self) -> String {
+ format!("@{}", self.username)
+ }
+}
+
+pub fn notify(item: impl Summary) {
+ println!("breaking news: {}", item.summarize());
+}
+
+fn returns_summarizable() -> impl Summary {
+
+ NewsArticle {
+ headline: String::from("Penguins win the stanley cup championship!"),
+ location: String::from("Pittsburgh, PA, USA"),
+ author: String::from("Iceburgh"),
+ content: String::from("The pittsburgh penguins are winners I guess."),
+ }
+// Tweet {
+// username: String::from("horse_ebooks"),
+// content: String::from("of course blargh"),
+// reply: false,
+// retweet: false,
+// }
+}
+
+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,
+ };
+
+ //dbg!(tweet.summarize());
+
+ let article = NewsArticle {
+ headline: String::from("Penguins win the stanley cup championship!"),
+ location: String::from("Pittsburgh, PA, USA"),
+ author: String::from("Iceburgh"),
+ content: String::from("The pittsburgh penguins are winners I guess."),
+ };
+
+ //dbg!(article.summarize());
+
+ //notify(tweet);
+
+ returns_summarizable();
+}