feat(rust by example): Generics(Associated Items)

Author: unpervertedkid

rust_by_example/generics/associated_items/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "associated_items"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

rust_by_example/generics/associated_items/src/main.rs

@@ -0,0 +1,49 @@
+struct Container(i32, i32);
+
+trait Contains {
+    type A;
+    type B;
+
+    fn contains(&self, _: &Self::A, _: &Self::B) -> bool;
+    fn first(&self) -> i32;
+    fn last(&self) -> i32;
+}
+
+impl Contains for Container {
+    type A = i32;
+    type B = i32;
+
+    fn contains(&self, number_1: &Self::A, number_2: &Self::B) -> bool {
+        (&self.first() == number_1) && (&self.last() == number_2)
+    }
+
+    fn first(&self) -> Self::A {
+        self.0
+    }
+
+    fn last(&self) -> Self::B {
+        self.1
+    }
+}
+
+fn difference<C: Contains>(container: &C) -> i32 {
+    container.last() - container.first()
+}
+
+fn main() {
+    let number_1 = 2;
+    let number_2 = 4;
+
+    let container = Container(number_1, number_2);
+
+    println!(
+        "Does container contain {} and {}: {}",
+        &number_1,
+        &number_2,
+        container.contains(&number_1, &number_2)
+    );
+    println!("First number is {}", container.first());
+    println!("Last number is {}", container.last());
+
+    println!("The difference is: {}", difference(&container));
+}