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|
enum Message {
// TODO: Implement the message variant types based on their usage below.
}
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) {
// TODO: Create a match expression to process the different message variants.
// Remember: When passing a tuple as a function argument, you'll need extra parentheses:
// e.g. `foo((t, u, p, l, e))`
}
}
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!");
}
}
|
