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|
pub enum Order =
| Lt
| Eq
| Gt
;
pub fn reverse(order) {
case order {
| Lt -> Gt
| Eq -> Eq
| Gt -> Lt
}
}
pub fn to_int(order) {
case order {
| Lt -> -1
| Eq -> 0
| Gt -> 1
}
}
pub fn compare(a, b) {
case {a, b} {
| {Lt, Lt} -> Eq
| {Lt, _} -> Lt
| {Eq, Eq} -> Eq
| {Gt, Gt} -> Eq
| {Eq, Gt} -> Lt
| _ -> Gt
}
}
pub fn max(a, b) {
case {a, b} {
| {Gt, _} -> Gt
| {Eq, Lt} -> Eq
| _ -> b
}
}
pub fn min(a, b) {
case {a, b} {
| {Lt, _} -> Lt
| {Eq, Gt} -> Eq
| _ -> b
}
}
|
