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Add tracking issue #75243

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Add note & example about iter order

Add doc changes

Update doc comments
This commit is contained in:
kadmin
2020-08-07 06:00:52 +00:00
parent 56a651ca15
commit 54b821ebc0
1 changed files with 9 additions and 2 deletions
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11
library/core/src/array/mod.rs
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@@ -368,16 +368,23 @@ array_impl_default! {32, T T T T T T T T T T T T T T T T T T T T T T T T T T T T
#[cfg(not(bootstrap))] #[cfg(not(bootstrap))]
#[lang = "array"] #[lang = "array"]
impl<T, const N: usize> [T; N] { impl<T, const N: usize> [T; N] {
/// Returns an array of the same size as self, with `f` applied to each element. /// Returns an array of the same size as `self`, with function `f` applied to each element.
/// The closure will be called on elements 0 up to but excluding N.
/// ///
/// # Examples /// # Examples
///
/// ``` /// ```
/// # #![feature(array_map)] /// # #![feature(array_map)]
/// let x = [1, 2, 3]; /// let x = [1, 2, 3];
/// let y = x.map(|v| v + 1); /// let y = x.map(|v| v + 1);
/// assert_eq!(y, [2, 3, 4]); /// assert_eq!(y, [2, 3, 4]);
///
/// let x = [1, 2, 3];
/// let mut temp = 0;
/// let y = x.map(|v| { temp += 1; v * temp });
/// assert_eq!(y, [1, 4, 9]);
/// ``` /// ```
#[unstable(feature = "array_map", issue = "77777")] #[unstable(feature = "array_map", issue = "75243")]
pub fn map<F, U>(self, mut f: F) -> [U; N] pub fn map<F, U>(self, mut f: F) -> [U; N]
where where
F: FnMut(T) -> U, F: FnMut(T) -> U,