enum: Add more complex type

enum_example/src/main.rs

@@ -4,9 +4,35 @@ enum IpAddrKind {
     V6(String),
 }
 
+#[derive(Debug)]
+struct Color(i32, i32, i32);
+
+#[derive(Debug)]
+enum Message {
+    Quit,
+    Move { x: i32, y: i32},
+    Write(String),
+    ChangeColor(Color),
+}
+
+impl Message {
+    fn print(&self) {
+        println!("calling message {:?}", self);
+    }
+}
+
 fn main() {
     let v4 = IpAddrKind::V4(127, 0, 0, 1);
     let v6 = IpAddrKind::V6(String::from("::1"));
 
     println!("Ipv4: {:#?}, Ipv6: {:#?}", v4, v6);
+
+    let msg = Message::Quit;
+    msg.print();
+    let msg = Message::Move{ x: 1, y:2};
+    msg.print();
+    let msg = Message::Write(String::from("Hello enum"));
+    msg.print();
+    let msg = Message::ChangeColor(Color(1,2,3));
+    msg.print();
 }