Rust Guards
Guards
一個匹配guard可以被添加到過濾手臂。
fn main() {
let pair = (2, -2);
// TODO ^ Try different values for `pair`
println!("Tell me about {:?}", pair);
match pair {
(x, y) if x == y => println!("These are twins"),
// The ^ \`if condition\` part is a guard
(x, y) if x + y == 0 => println!("Antimatter, kaboom!"),
(x, \_) if x % 2 == 1 => println!("The first one is odd"),
\_ => println!("No correlation..."),
}
}
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