1.19.0[][src]Struct core::cmp::Reverse

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

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

Performs copy-assignment from source. Read more

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

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

Auto Trait Implementations

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

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

Blanket Implementations

impl<T, U> Into for T where
    U: From<T>, 
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Performs the conversion.

impl<T> From for T
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Performs the conversion.

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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🔬 This is a nightly-only experimental API. (try_from #33417)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from #33417)

Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
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🔬 This is a nightly-only experimental API. (try_from #33417)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from #33417)

Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
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Immutably borrows from an owned value. Read more

impl<T> BorrowMut for T where
    T: ?Sized
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Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
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🔬 This is a nightly-only experimental API. (get_type_id #27745)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more