Struct Reverse

#[repr(transparent)]
pub struct Reverse<T>(pub T);

A helper struct for reverse ordering.

This struct is a helper to be used with functions like Vec::sort_by_key and can be used to reverse order a part of a key.

Examples

use std::cmp::Reverse;

let mut v = vec![1, 2, 3, 4, 5, 6];
v.sort_by_key(|&num| (num > 3, Reverse(num)));
assert_eq!(v, vec![3, 2, 1, 6, 5, 4]);

Fields

0: T

Trait Implementations

impl<T: Clone> Clone for Reverse<T>

fn clone(&self) -> Reverse<T>
fn clone_from(&mut self, source: &Self)

impl<T: Copy> Copy for Reverse<T>

impl<T: Debug> Debug for Reverse<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

impl<T: Hash> Hash for Reverse<T>

fn hash<__H: Hasher>(&self, state: &mut __H)

impl<T: PartialEq> StructuralPartialEq for Reverse<T>

impl<T: ~const Default> Default for Reverse<T>

fn default() -> Reverse<T>

impl<T: ~const Eq> Eq for Reverse<T>

fn assert_fields_are_eq(&self)

impl<T: ~const Ord> Ord for Reverse<T>

fn cmp(&self, other: &Reverse<T>) -> Ordering

impl<T: ~const PartialEq> PartialEq for Reverse<T>

fn eq(&self, other: &Reverse<T>) -> bool

impl<T: ~const PartialOrd> PartialOrd for Reverse<T>

fn partial_cmp(&self, other: &Reverse<T>) -> Option<Ordering>
fn lt(&self, other: &Self) -> bool
fn le(&self, other: &Self) -> bool
fn gt(&self, other: &Self) -> bool
fn ge(&self, other: &Self) -> bool

Auto Trait Implementations

impl<T> Freeze for Reverse<T> where T: Freeze,

impl<T> RefUnwindSafe for Reverse<T> where T: RefUnwindSafe,

impl<T> Send for Reverse<T> where T: Send,

impl<T> Sync for Reverse<T> where T: Sync,

impl<T> Unpin for Reverse<T> where T: Unpin,

impl<T> UnsafeUnpin for Reverse<T> where T: UnsafeUnpin,

impl<T> UnwindSafe for Reverse<T> where T: UnwindSafe,

Blanket Implementations

impl<T> Any for Reverse<T> where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for Reverse<T> where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for Reverse<T> where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

impl<T> CloneToUninit for Reverse<T> where T: Clone,

unsafe fn clone_to_uninit(&self, dest: *mut u8)

impl<T> From<T> for Reverse<T>

fn from(t: T) -> T

Returns the argument unchanged.

impl<T> Printable for Reverse<T> where T: Copy + Debug,

impl<T> SizeHint for Reverse<T> where T: ?Sized,

fn lower_bound(&self) -> usize
fn upper_bound(&self) -> Option<usize>

impl<T> SizedTypeProperties for Reverse<T>

impl<T, U> Into<U> for Reverse<T> where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of [From]<T> for U chooses to do.

impl<T, U> TryFrom<U> for Reverse<T> where U: Into<T>,

type Error = Infallible;
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for Reverse<T> where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error;
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>