# 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> StructuralPartialEq for Reverse<T>`[src]

### `impl<T> StructuralEq for Reverse<T>`[src]

### `impl<T: Copy> Copy for Reverse<T>`[src]

### `impl<T: PartialEq> PartialEq<Reverse<T>> for Reverse<T>`[src]

#### `fn eq(&self, other: &Reverse<T>) -> bool`[src]

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, other: &Reverse<T>) -> bool`[src]

This method tests for `!=`.

### `impl<T: Eq> Eq for Reverse<T>`[src]

### `impl<T: Ord> Ord for Reverse<T>`[src]

#### `fn cmp(&self, other: &Reverse<T>) -> Ordering`[src]

This method returns an `Ordering` between `self` and `other`. Read more

#### `fn max(self, other: Self) -> Self where
Self: Sized,` 1.21.0[src]

Compares and returns the maximum of two values. Read more

#### `fn min(self, other: Self) -> Self where
Self: Sized,` 1.21.0[src]

Compares and returns the minimum of two values. Read more

#### `fn clamp(self, min: Self, max: Self) -> Self where
Self: Sized,` [src]

🔬 This is a nightly-only experimental API. (`clamp` #44095)

Restrict a value to a certain interval. Read more

### `impl<T: PartialOrd> PartialOrd<Reverse<T>> for Reverse<T>`[src]

#### `fn partial_cmp(&self, other: &Reverse<T>) -> Option<Ordering>`[src]

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

#### `fn lt(&self, other: &Self) -> bool`[src]

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

#### `fn le(&self, other: &Self) -> bool`[src]

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

#### `fn gt(&self, other: &Self) -> bool`[src]

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

#### `fn ge(&self, other: &Self) -> bool`[src]

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

### `impl<T: Clone> Clone for Reverse<T>`[src]

#### `fn clone(&self) -> Reverse<T>`[src]

Returns a copy of the value. Read more

#### `fn clone_from(&mut self, source: &Self)`1.0.0[src]

Performs copy-assignment from `source`. Read more

### `impl<T: Default> Default for Reverse<T>`[src]

#### `fn default() -> Reverse<T>`[src]

Returns the "default value" for a type. Read more

### `impl<T: Hash> Hash for Reverse<T>`[src]

#### `fn hash<__H: Hasher>(&self, state: &mut __H)`[src]

Feeds this value into the given [`Hasher`]. Read more

#### `fn hash_slice<H: Hasher>(data: &[Self], state: &mut H) where
Self: Sized,` 1.3.0[src]

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

### `impl<T: Debug> Debug for Reverse<T>`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result`[src]

Formats the value using the given formatter. Read more

## Auto Trait Implementations

### `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,`

## Blanket Implementations

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `fn into(Self) -> U`[src]

Performs the conversion.

### `impl<T> From<T> for T`[src]

#### `fn from(T) -> T`[src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

#### `type Error = <U as TryFrom<T>>::Error`

The type returned in the event of a conversion error.

#### `fn try_into(Self) -> Result<U, <U as TryFrom<T>>::Error>`[src]

Performs the conversion.

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = !`

The type returned in the event of a conversion error.

#### `fn try_from(U) -> Result<T, <T as TryFrom<U>>::Error>`[src]

Performs the conversion.

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

#### `fn borrow(&Self) -> &T`[src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

#### `fn borrow_mut(&mut Self) -> &mut T`[src]

Mutably borrows from an owned value. Read more

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `fn type_id(&Self) -> TypeId`[src]

Gets the `TypeId` of `self`. Read more