什么时候应该std::cmp::ordering在match块中使用而不是使用if/ else if语句?可读性是唯一的区别吗?
例如:
use std::cmp::Ordering;
fn main() {
match 2.cmp(&2) {
Ordering::Less => println!("Less than 2."),
Ordering::Greater => println!("Greater than 2."),
Ordering::Equal => println!("Equal to 2."),
}
}
Run Code Online (Sandbox Code Playgroud)
与
fn main() {
if 1 < 2 {
println!("less than 2.");
} else if 1 > 2 {
println!("Greater than 2.");
} else if 1 == 2 {
println!("Equal to 2.");
}
}
Run Code Online (Sandbox Code Playgroud)