Super basic question about enums and structs

[2e71828]

@Daja

why doesn't the compiler complain about the missing placeholder _ for every other processing case

I’m assuming that you’re confused by the lack of an _ => ... arm in this match statement:

@Daja

    fn process(&mut self, message: Message) {
        match message {
            Message::ChangeColor(a,b,c) => self.change_color((a,b,c)),
            Message::Quit => self.quit(),
            Message::Echo(s) => self.echo(s),
            Message::Move(p) => self.move_position(p),
        }
    }

Match requires that every possible value gets selected by one of the patterns. In this case, the compiler can see that you’ve already matched every possible variant of message and thus don’t need a wildcard pattern.