#[repr(transparent)]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<'de, T> Deserialize<'de> for Reverse<T>where
T: Deserialize<'de>,
impl<'de, T> Deserialize<'de> for Reverse<T>where
T: Deserialize<'de>,
source§fn deserialize<D>(
deserializer: D,
) -> Result<Reverse<T>, <D as Deserializer<'de>>::Error>where
D: Deserializer<'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. Read more
1.19.0 · 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
1.19.0 · source§impl<T> PartialOrd for Reverse<T>where
T: PartialOrd,
impl<T> PartialOrd for Reverse<T>where
T: PartialOrd,
source§impl<T> Serialize for Reverse<T>where
T: Serialize,
impl<T> Serialize for Reverse<T>where
T: Serialize,
source§fn serialize<S>(
&self,
serializer: S,
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>where
S: Serializer,
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. Read more
impl<T> Copy for Reverse<T>where
T: Copy,
impl<T> Eq for Reverse<T>where
T: Eq,
impl<T> StructuralPartialEq for Reverse<T>
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> UnwindSafe for Reverse<T>where
T: UnwindSafe,
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
🔬This is a nightly-only experimental API. (
clone_to_uninit
)§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
Checks if this value is equivalent to the given key. Read more
§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
Compare self to
key
and return true
if they are equal.