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| fn seq_lt<A: Eq + Ord, T: Iterator<A>>(mut a: T, mut b: T) -> bool { | |
| loop { | |
| match (a.next(), b.next()) { | |
| (None, None) => return false, | |
| (None, _ ) => return true, | |
| (_, None) => return false, | |
| (Some(x), Some(y)) => if !x.eq(&y) { return x.lt(&y) } | |
| } | |
| } | |
| } | |
| fn seq_lt2<A: Ord, T: Iterator<A>>(mut a: T, mut b: T) -> bool { | |
| loop { | |
| match (a.next(), b.next()) { | |
| (None, None) => return false, | |
| (None, _ ) => return true, | |
| (_, None) => return false, | |
| (Some(x), Some(y)) => if x.lt(&y) || y.lt(&x) { return x.lt(&y) } | |
| } | |
| } | |
| } | |
| fn main() { | |
| let x = [1]; | |
| let y = [1]; | |
| assert!(seq_lt(x.iter(), y.iter()) == seq_lt2(x.iter(), y.iter())); | |
| let x = [1, 2]; | |
| let y = [1]; | |
| assert!(seq_lt(x.iter(), y.iter()) == seq_lt2(x.iter(), y.iter())); | |
| let x = [1]; | |
| let y = [1, 2]; | |
| assert!(seq_lt(x.iter(), y.iter()) == seq_lt2(x.iter(), y.iter())); | |
| let x = [1, 2]; | |
| let y = [1, 3]; | |
| assert!(seq_lt(x.iter(), y.iter()) == seq_lt2(x.iter(), y.iter())); | |
| let x = [1, 3]; | |
| let y = [1, 2]; | |
| assert!(seq_lt(x.iter(), y.iter()) == seq_lt2(x.iter(), y.iter())); | |
| } |
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