Struct std::cmp::Reverse1.19.0[][src]

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.

Example usage:

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]);Run

Trait Implementations

impl<T> Clone for Reverse<T> where
    T: Clone
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Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

impl<T> PartialOrd<Reverse<T>> for Reverse<T> where
    T: PartialOrd<T>, 
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This method returns an ordering between self and other values if one exists. Read more

This method tests less than (for self and other) and is used by the < operator. Read more

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

This method tests greater than (for self and other) and is used by the > operator. Read more

impl<T> Eq for Reverse<T> where
    T: Eq
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impl<T> Hash for Reverse<T> where
    T: Hash
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Feeds this value into the given [Hasher]. Read more

Feeds a slice of this type into the given [Hasher]. Read more

impl<T> Debug for Reverse<T> where
    T: Debug
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Formats the value using the given formatter. Read more

impl<T> Ord for Reverse<T> where
    T: Ord
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This method returns an Ordering between self and other. Read more

Compares and returns the maximum of two values. Read more

Compares and returns the minimum of two values. Read more

impl<T> PartialEq<Reverse<T>> for Reverse<T> where
    T: PartialEq<T>, 
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This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

impl<T> Copy for Reverse<T> where
    T: Copy
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impl<T> Default for Reverse<T> where
    T: Default
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Returns the "default value" for a type. Read more

Auto Trait Implementations

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

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