pub struct Reverse<T>(pub T);
Expand description
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§
source§impl<T> Ord for Reverse<T>where
T: Ord,
impl<T> Ord for Reverse<T>where T: Ord,
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere Self: Sized,
Compares and returns the maximum of two values. Read more
source§impl<T> PartialEq<Reverse<T>> for Reverse<T>where
T: PartialEq<T>,
impl<T> PartialEq<Reverse<T>> for Reverse<T>where T: PartialEq<T>,
const: unstable · source§impl<T> PartialOrd<Reverse<T>> for Reverse<T>where
T: PartialOrd<T>,
impl<T> PartialOrd<Reverse<T>> for Reverse<T>where T: PartialOrd<T>,
const: unstable · source§fn le(&self, other: &Reverse<T>) -> bool
fn le(&self, other: &Reverse<T>) -> bool
This method tests less than or equal to (for
self
and other
) and is used by the <=
operator. Read moreimpl<T> Copy for Reverse<T>where T: Copy,
impl<T> Eq for Reverse<T>where T: Eq,
impl<T> StructuralEq for Reverse<T>
impl<T> StructuralPartialEq for Reverse<T>
Auto Trait Implementations§
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> UnwindSafe for Reverse<T>where T: UnwindSafe,
Blanket Implementations§
source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
fn instrument(self, span: Span) -> Instrumented<Self> ⓘ
source§fn in_current_span(self) -> Instrumented<Self> ⓘ
fn in_current_span(self) -> Instrumented<Self> ⓘ
source§impl<T> IsDefault for Twhere
T: Default + PartialEq<T> + Copy,
impl<T> IsDefault for Twhere T: Default + PartialEq<T> + Copy,
source§fn is_default(&self) -> bool
fn is_default(&self) -> bool
Checks that type has a default value.
§impl<T> RoundFrom<T> for T
impl<T> RoundFrom<T> for T
§fn round_from(x: T) -> T
fn round_from(x: T) -> T
Performs the conversion.
§impl<T, U> RoundInto<U> for Twhere
U: RoundFrom<T>,
impl<T, U> RoundInto<U> for Twhere U: RoundFrom<T>,
§fn round_into(self) -> U
fn round_into(self) -> U
Performs the conversion.