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]);

Tuple Fields

0: T

Trait Implementations

impl<A> Arbitrary for Reverse<A>

where A: Arbitrary,

type Parameters = <A as Arbitrary>::Parameters

The type of parameters that arbitrary_with accepts for configuration of the generated Strategy. Parameters must implement Default.

type Strategy = Map<<A as Arbitrary>::Strategy, fn(_: A) -> Reverse<A>>

The type of Strategy used to generate values of type Self.

fn arbitrary_with( args: <Reverse<A> as Arbitrary>::Parameters, ) -> <Reverse<A> as Arbitrary>::Strategy

Generates a Strategy for producing arbitrary values of type the implementing type (Self). The strategy is passed the arguments given in args.

fn arbitrary() -> Self::Strategy

Generates a Strategy for producing arbitrary values of type the implementing type (Self).

impl<A> ArbitraryF1<A> for Reverse<A>

where A: Debug + 'static,

type Parameters = ()

The type of parameters that lift1_with accepts for configuration of the lifted and generated Strategy. Parameters must implement Default.

fn lift1_with<S>( base: S, _args: <Reverse<A> as ArbitraryF1<A>>::Parameters, ) -> BoxedStrategy<Reverse<A>>

where S: Strategy<Value = A> + 'static,

Lifts a given Strategy to a new Strategy for the (presumably) bigger type. This is useful for lifting a Strategy for SomeType to a container such as Vec of SomeType. The composite strategy is passed the arguments given in args.

fn lift1<AS>(base: AS) -> BoxedStrategy<Self>

where AS: Strategy<Value = A> + 'static,

Lifts a given Strategy to a new Strategy for the (presumably) bigger type. This is useful for lifting a Strategy for SomeType to a container such as Vec<SomeType>.

impl<T> Clone for Reverse<T>

where T: Clone,

fn clone(&self) -> Reverse<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T> Debug for Reverse<T>

where T: Debug,

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

Formats the value using the given formatter.

impl<T> Default for Reverse<T>

where T: Default,

fn default() -> Reverse<T>

Returns the “default value” for a type.

impl<'de, T> Deserialize<'de> for Reverse<T>

where T: Deserialize<'de>,

fn deserialize<D>( deserializer: D, ) -> Result<Reverse<T>, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T> Hash for Reverse<T>

where T: Hash,

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

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<T> Ord for Reverse<T>

where T: Ord,

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

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<T> PartialEq for Reverse<T>

where T: PartialEq,

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

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T> PartialOrd for Reverse<T>

where T: PartialOrd,

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

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<T> Serialize for Reverse<T>

where T: Serialize,

fn serialize<S>( &self, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl<T> Copy for Reverse<T>

where T: Copy,

impl<T> Eq for Reverse<T>

where T: Eq,

impl<T> StructuralPartialEq for Reverse<T>