# Enum core::cmp::Ordering
[−]
[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`

.

`Less`

becomes`Greater`

.`Greater`

becomes`Less`

.`Equal`

becomes`Equal`

.

# 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() { use std::cmp::Ordering; 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); }use std::cmp::Ordering; 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);