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Clarify the difference between get_mut and into_mut for OccupiedEntry #51312

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Merged
merged 4 commits into from
Jun 3, 2018
Merged

Clarify the difference between get_mut and into_mut for OccupiedEntry #51312

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1bc6c4b
Clarify the difference between get_mut and into_mut for OccupiedEntry
Phlosioneer Apr 6, 2018
ed1a8ff
Fixed typo
Phlosioneer Apr 6, 2018
a86f556
Add a couple lines describing differences between into_mut/get_mut.
frewsxcv Jun 2, 2018
dd88f88
Copy changes from HashMap over to BTreeMap.
frewsxcv Jun 2, 2018
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17 changes: 15 additions & 2 deletions src/liballoc/btree/map.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2369,6 +2369,11 @@ impl<'a, K: Ord, V> OccupiedEntry<'a, K, V> {

/// Gets a mutable reference to the value in the entry.
///
/// If you need a reference to the `OccupiedEntry` which may outlive the
/// destruction of the `Entry` value, see [`into_mut`].
///
/// [`into_mut`]: #method.into_mut
///
/// # Examples
///
/// ```
Expand All @@ -2380,9 +2385,13 @@ impl<'a, K: Ord, V> OccupiedEntry<'a, K, V> {
///
/// assert_eq!(map["poneyland"], 12);
/// if let Entry::Occupied(mut o) = map.entry("poneyland") {
/// *o.get_mut() += 10;
/// *o.get_mut() += 10;
/// assert_eq!(*o.get(), 22);
///
/// // We can use the same Entry multiple times.
/// *o.get_mut() += 2;
/// }
/// assert_eq!(map["poneyland"], 22);
/// assert_eq!(map["poneyland"], 24);
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn get_mut(&mut self) -> &mut V {
Expand All @@ -2391,6 +2400,10 @@ impl<'a, K: Ord, V> OccupiedEntry<'a, K, V> {

/// Converts the entry into a mutable reference to its value.
///
/// If you need multiple references to the `OccupiedEntry`, see [`get_mut`].
///
/// [`get_mut`]: #method.get_mut
///
/// # Examples
///
/// ```
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17 changes: 15 additions & 2 deletions src/libstd/collections/hash/map.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2250,6 +2250,11 @@ impl<'a, K, V> OccupiedEntry<'a, K, V> {

/// Gets a mutable reference to the value in the entry.
///
/// If you need a reference to the `OccupiedEntry` which may outlive the
/// destruction of the `Entry` value, see [`into_mut`].
///
/// [`into_mut`]: #method.into_mut
///
/// # Examples
///
/// ```
Expand All @@ -2261,10 +2266,14 @@ impl<'a, K, V> OccupiedEntry<'a, K, V> {
///
/// assert_eq!(map["poneyland"], 12);
/// if let Entry::Occupied(mut o) = map.entry("poneyland") {
/// *o.get_mut() += 10;
/// *o.get_mut() += 10;
/// assert_eq!(*o.get(), 22);
///
/// // We can use the same Entry multiple times.
/// *o.get_mut() += 2;
/// }
///
/// assert_eq!(map["poneyland"], 22);
/// assert_eq!(map["poneyland"], 24);
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn get_mut(&mut self) -> &mut V {
Expand All @@ -2274,6 +2283,10 @@ impl<'a, K, V> OccupiedEntry<'a, K, V> {
/// Converts the OccupiedEntry into a mutable reference to the value in the entry
/// with a lifetime bound to the map itself.
///
/// If you need multiple references to the `OccupiedEntry`, see [`get_mut`].
///
/// [`get_mut`]: #method.get_mut
///
/// # Examples
///
/// ```
Expand Down