Initial commit

03_derive/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "demo"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

03_derive/src/main.rs

@@ -0,0 +1,26 @@
+// Procedural macro
+// Derive macro
+
+// #[derive(Debug)]
+struct User {
+    first_name: String,
+    last_name: String,
+    email: String,
+}
+
+impl std::fmt::Display for User {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{} {}", self.first_name, self.last_name)
+    }
+}
+
+fn main() {
+    let tim = User {
+        first_name: "Tim".into(),
+        last_name: "Huizinga".into(),
+        email: "tim@huizinga.dev".into(),
+    };
+
+    println!("User: {tim}");
+    // println!("User: {tim:?}");
+}