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Rollup merge of #49243 - murarth:stabilize-retain, r=BurntSushi

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Stabilize method `String::retain`

Closes #43874
This commit is contained in:
kennytm
2018-03-28 17:55:05 +02:00
committed by GitHub
parent d87c19db6d 7c442e5c9b
commit 43f56ce131
2 changed files with 1 additions and 26 deletions
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23
src/doc/unstable-book/src/library-features/string-retain.md
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@@ -1,23 +0,0 @@
# `string_retain`
The tracking issue for this feature is: [#43874]
[#43874]: https://github.com/rust-lang/rust/issues/43874
------------------------
Retains only the characters specified by the predicate.
In other words, remove all characters `c` such that `f(c)` returns `false`.
This method operates in place and preserves the order of the retained
characters.
```rust
#![feature(string_retain)]
let mut s = String::from("f_o_ob_ar");
s.retain(|c| c != '_');
assert_eq!(s, "foobar");
```

4
src/liballoc/string.rs
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@@ -1177,8 +1177,6 @@ impl String {
/// # Examples /// # Examples
/// ///
/// ``` /// ```
/// #![feature(string_retain)]
///
/// let mut s = String::from("f_o_ob_ar"); /// let mut s = String::from("f_o_ob_ar");
/// ///
/// s.retain(|c| c != '_'); /// s.retain(|c| c != '_');
@@ -1186,7 +1184,7 @@ impl String {
/// assert_eq!(s, "foobar"); /// assert_eq!(s, "foobar");
/// ``` /// ```
#[inline] #[inline]
#[unstable(feature = "string_retain", issue = "43874")] #[stable(feature = "string_retain", since = "1.26.0")]
pub fn retain<F>(&mut self, mut f: F) pub fn retain<F>(&mut self, mut f: F)
where F: FnMut(char) -> bool where F: FnMut(char) -> bool
{ {