mikros/rust
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Rollup merge of #102435 - GuillaumeGomez:improve-iterator-reduce-example, r=thomcc,vacuus

Browse Source 
Improve example of Iterator::reduce

Fixes #81819.

I took your example `@bstrie` from https://github.com/rust-lang/rust/issues/81819 and applied it here.

r? `@thomcc`
This commit is contained in:
Dylan DPC 2022-09-29 18:13:20 +05:30 committed by GitHub
commit b6d1c15076
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 5 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
library/core/src/iter/traits/iterator.rs
View File

@ -2431,22 +2431,13 @@ pub trait Iterator {
/// ///
/// # Example /// # Example
/// ///
/// Find the maximum value:
///
/// ``` /// ```
/// fn find_max<I>(iter: I) -> Option<I::Item> /// let reduced: i32 = (1..10).reduce(|acc, e| acc + e).unwrap();
/// where I: Iterator, /// assert_eq!(reduced, 45);
/// I::Item: Ord,
/// {
/// iter.reduce(|accum, item| {
/// if accum >= item { accum } else { item }
/// })
/// }
/// let a = [10, 20, 5, -23, 0];
/// let b: [u32; 0] = [];
/// ///
/// assert_eq!(find_max(a.iter()), Some(&20)); /// // Which is equivalent to doing it with `fold`:
/// assert_eq!(find_max(b.iter()), None); /// let folded: i32 = (1..10).fold(0, |acc, e| acc + e);
/// assert_eq!(reduced, folded);
/// ``` /// ```
#[inline] #[inline]
#[stable(feature = "iterator_fold_self", since = "1.51.0")] #[stable(feature = "iterator_fold_self", since = "1.51.0")]