rustlings/exercises/08_enums/enums3.rs

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struct Point {
x: u64,
y: u64,
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}
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enum Message {
// TODO: Implement the message variant types based on their usage below.
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}
struct State {
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width: u64,
height: u64,
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position: Point,
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message: String,
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color: (u8, u8, u8),
quit: bool,
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}
impl State {
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fn resize(&mut self, width: u64, height: u64) {
self.width = width;
self.height = height;
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}
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fn move_position(&mut self, point: Point) {
self.position = point;
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}
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fn echo(&mut self, s: String) {
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self.message = s;
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}
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fn change_color(&mut self, color: (u8, u8, u8)) {
self.color = color;
}
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fn quit(&mut self) {
self.quit = true;
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}
fn process(&mut self, message: Message) {
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// TODO: Create a match expression to process the different message variants.
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// Remember: When passing a tuple as a function argument, you'll need extra parentheses:
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// e.g. `foo((t, u, p, l, e))`
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}
}
fn main() {
// You can optionally experiment here.
}
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#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_match_message_call() {
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let mut state = State {
width: 0,
height: 0,
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position: Point { x: 0, y: 0 },
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message: String::from("hello world"),
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color: (0, 0, 0),
quit: false,
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};
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state.process(Message::Resize {
width: 10,
height: 30,
});
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state.process(Message::Move(Point { x: 10, y: 15 }));
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state.process(Message::Echo(String::from("Hello world!")));
state.process(Message::ChangeColor(255, 0, 255));
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state.process(Message::Quit);
assert_eq!(state.width, 10);
assert_eq!(state.height, 30);
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assert_eq!(state.position.x, 10);
assert_eq!(state.position.y, 15);
assert_eq!(state.message, "Hello world!");
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assert_eq!(state.color, (255, 0, 255));
assert!(state.quit);
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}
}