Merge remote-tracking branch 'upstream/main' into fix-enum-variant-inconsistency

3 files changed, 116 insertions, 0 deletions

diff --git a/solutions/08_enums/enums1.rs b/solutions/08_enums/enums1.rs
new file mode 100644
index 0000000..9724883
--- /dev/null
+++ b/solutions/08_enums/enums1.rs
@@ -0,0 +1,14 @@
+#[derive(Debug)]
+enum Message {
+    Quit,
+    Echo,
+    Move,
+    ChangeColor,
+}
+
+fn main() {
+    println!("{:?}", Message::Quit);
+    println!("{:?}", Message::Echo);
+    println!("{:?}", Message::Move);
+    println!("{:?}", Message::ChangeColor);
+}
diff --git a/solutions/08_enums/enums2.rs b/solutions/08_enums/enums2.rs
new file mode 100644
index 0000000..b19394c
--- /dev/null
+++ b/solutions/08_enums/enums2.rs
@@ -0,0 +1,27 @@
+#[allow(dead_code)]
+#[derive(Debug)]
+enum Message {
+    Move { x: i64, y: i64 },
+    Echo(String),
+    ChangeColor(u8, u8, u8),
+    Quit,
+}
+
+impl Message {
+    fn call(&self) {
+        println!("{self:?}");
+    }
+}
+
+fn main() {
+    let messages = [
+        Message::Move { x: 10, y: 30 },
+        Message::Echo(String::from("hello world")),
+        Message::ChangeColor(200, 255, 255),
+        Message::Quit,
+    ];
+
+    for message in &messages {
+        message.call();
+    }
+}
diff --git a/solutions/08_enums/enums3.rs b/solutions/08_enums/enums3.rs
new file mode 100644
index 0000000..8baa25c
--- /dev/null
+++ b/solutions/08_enums/enums3.rs
@@ -0,0 +1,75 @@
+enum Message {
+    ChangeColor(u8, u8, u8),
+    Echo(String),
+    Move(Point),
+    Quit,
+}
+
+struct Point {
+    x: u8,
+    y: u8,
+}
+
+struct State {
+    color: (u8, u8, u8),
+    position: Point,
+    quit: bool,
+    message: String,
+}
+
+impl State {
+    fn change_color(&mut self, color: (u8, u8, u8)) {
+        self.color = color;
+    }
+
+    fn quit(&mut self) {
+        self.quit = true;
+    }
+
+    fn echo(&mut self, s: String) {
+        self.message = s;
+    }
+
+    fn move_position(&mut self, point: Point) {
+        self.position = point;
+    }
+
+    fn process(&mut self, message: Message) {
+        match message {
+            Message::ChangeColor(r, g, b) => self.change_color((r, g, b)),
+            Message::Echo(s) => self.echo(s),
+            Message::Move(point) => self.move_position(point),
+            Message::Quit => self.quit(),
+        }
+    }
+}
+
+fn main() {
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_match_message_call() {
+        let mut state = State {
+            quit: false,
+            position: Point { x: 0, y: 0 },
+            color: (0, 0, 0),
+            message: String::from("hello world"),
+        };
+
+        state.process(Message::ChangeColor(255, 0, 255));
+        state.process(Message::Echo(String::from("Hello world!")));
+        state.process(Message::Move(Point { x: 10, y: 15 }));
+        state.process(Message::Quit);
+
+        assert_eq!(state.color, (255, 0, 255));
+        assert_eq!(state.position.x, 10);
+        assert_eq!(state.position.y, 15);
+        assert!(state.quit);
+        assert_eq!(state.message, "Hello world!");
+    }
+}