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// enums3.rs
// 解决所有的 TODO ,通过测试!
// I AM NOT DONE
enum Message {
// TODO根据以下的使用方式实现 Message 的不同类型
}
struct Point {
x: u8,
y: u8,
}
struct State {
color: (u8, u8, u8),
position: Point,
quit: bool,
}
impl State {
fn change_color(&mut self, color: (u8, u8, u8)) {
self.color = color;
}
fn quit(&mut self) {
self.quit = true;
}
fn echo(&self, s: String) {
println!("{}", s);
}
fn move_position(&mut self, p: Point) {
self.position = p;
}
fn process(&mut self, message: Message) {
// TODO使用 match 表达式来处理不同类型的消息
}
}
#[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),
};
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_eq!(state.quit, true);
}
}