Enum std::cmp::Ordering
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[src]
pub enum Ordering {
Less,
Equal,
Greater,
}An Ordering is the result of a comparison between two values.
Examples
fn main() { use std::cmp::Ordering; let result = 1.cmp(&2); assert_eq!(Ordering::Less, result); let result = 1.cmp(&1); assert_eq!(Ordering::Equal, result); let result = 2.cmp(&1); assert_eq!(Ordering::Greater, result); }use std::cmp::Ordering; let result = 1.cmp(&2); assert_eq!(Ordering::Less, result); let result = 1.cmp(&1); assert_eq!(Ordering::Equal, result); let result = 2.cmp(&1); assert_eq!(Ordering::Greater, result);
Variants
Less | An ordering where a compared value is less [than another]. |
Equal | An ordering where a compared value is equal [to another]. |
Greater | An ordering where a compared value is greater [than another]. |
Methods
impl Ordering
fn reverse(self) -> Ordering
Reverse the Ordering.
LessbecomesGreater.GreaterbecomesLess.EqualbecomesEqual.
Examples
Basic behavior:
fn main() { use std::cmp::Ordering; assert_eq!(Ordering::Less.reverse(), Ordering::Greater); assert_eq!(Ordering::Equal.reverse(), Ordering::Equal); assert_eq!(Ordering::Greater.reverse(), Ordering::Less); }use std::cmp::Ordering; assert_eq!(Ordering::Less.reverse(), Ordering::Greater); assert_eq!(Ordering::Equal.reverse(), Ordering::Equal); assert_eq!(Ordering::Greater.reverse(), Ordering::Less);
This method can be used to reverse a comparison:
fn main() { let mut data: &mut [_] = &mut [2, 10, 5, 8]; // sort the array from largest to smallest. data.sort_by(|a, b| a.cmp(b).reverse()); let b: &mut [_] = &mut [10, 8, 5, 2]; assert!(data == b); }let mut data: &mut [_] = &mut [2, 10, 5, 8]; // sort the array from largest to smallest. data.sort_by(|a, b| a.cmp(b).reverse()); let b: &mut [_] = &mut [10, 8, 5, 2]; assert!(data == b);