std::cmp::Reverse - Rust
Description: API documentation for the Rust `Reverse` struct in crate `std`.
Keywords: rust, rustlang, rust-lang, Reverse

# Struct std::cmp::Reverse 1.19.0[−][src]

    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> Hash for Reverse<T> where T: Hash,`

[src]

####

`fn hash<__HT>(&self, state: &mut __HT) where __HT: Hasher,`

[src]

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

####

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

1.3.0
[src]

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

###

`impl<T> Clone for Reverse<T> where T: Clone,`

[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> Debug for Reverse<T> where T: Debug,`

[src]

####

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

[src]

Formats the value using the given formatter. Read more

###

`impl<T> PartialOrd<Reverse<T>> for Reverse<T> where T: PartialOrd<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: &Reverse<T>) -> bool`

[src]

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

####

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

[src]

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

####

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

[src]

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

####

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

[src]

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

###

`impl<T> Ord for Reverse<T> where T: Ord,`

[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`

1.21.0
[src]

Compares and returns the maximum of two values. Read more

####

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

1.21.0
[src]

Compares and returns the minimum of two values. Read more

###

`impl<T> Eq for Reverse<T> where T: Eq,`

[src]

###

`impl<T> PartialEq<Reverse<T>> for Reverse<T> where T: PartialEq<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> Copy for Reverse<T> where T: Copy,`

[src]

###

`impl<T> Default for Reverse<T> where T: Default,`

[src]

####

`fn default() -> Reverse<T>`

[src]

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

## Auto Trait Implementations

###

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

###

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

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g. `str,u8` or `String,struct:Vec,test`)