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Improvided map_entry_replace examples 

The current examples should be more realistic.
This commit is contained in:
Jeroen Bollen 2017-11-11 16:21:49 +01:00
parent 0f8ee171b2
commit 0fb37fc67d
1 changed files with 22 additions and 12 deletions
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34
src/libstd/collections/hash/map.rs
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@ -2247,17 +2247,18 @@ impl<'a, K, V> OccupiedEntry<'a, K, V> {
/// ```
/// #![feature(map_entry_replace)]
/// use std::collections::hash_map::{Entry, HashMap};
/// use std::rc::Rc;
///
/// let mut map: HashMap<String, u32> = HashMap::new();
/// map.insert("poneyland".to_string(), 15);
/// let mut map: HashMap<Rc<String>, u32> = HashMap::new();
/// map.insert(Rc::new("Stringthing".to_string()), 15);
///
/// if let Entry::Occupied(entry) = map.entry("poneyland".to_string()) {
/// let (old_key, old_value): (String, u32) = entry.replace_entry(16);
/// assert_eq!(old_key, "poneyland");
/// assert_eq!(old_value, 15);
/// let my_key = Rc::new("Stringthing".to_string());
///
/// if let Entry::Occupied(entry) = map.entry(my_key) {
/// // Also replace the key with a handle to our other key.
/// let (old_key, old_value): (Rc<String>, u32) = entry.replace_entry(16);
/// }
///
/// assert_eq!(map.get("poneyland"), Some(&16));
/// ```
#[unstable(feature = "map_entry_replace", issue = "44286")]
pub fn replace_entry(mut self, value: V) -> (K, V) {
@ -2276,13 +2277,22 @@ impl<'a, K, V> OccupiedEntry<'a, K, V> {
/// ```
/// #![feature(map_entry_replace)]
/// use std::collections::hash_map::{Entry, HashMap};
/// use std::rc::Rc;
///
/// let mut map: HashMap<String, u32> = HashMap::new();
/// map.insert("poneyland".to_string(), 15);
/// let mut map: HashMap<Rc<String>, u32> = HashMap::new();
/// let mut known_strings: Vec<Rc<String>> = Vec::new();
///
/// if let Entry::Occupied(entry) = map.entry("poneyland".to_string()) {
/// let old_key = entry.replace_key();
/// assert_eq!(old_key, "poneyland");
/// // Initialise known strings, run program, etc.
///
/// reclaim_memory(&mut map, &known_strings);
///
/// fn reclaim_memory(map: &mut HashMap<Rc<String>, u32>, known_strings: &[Rc<String>] ) {
/// for s in known_strings {
/// if let Entry::Occupied(entry) = map.entry(s.clone()) {
/// // Replaces the entry's key with our version of it in `known_strings`.
/// entry.replace_key();
/// }
/// }
/// }
/// ```
#[unstable(feature = "map_entry_replace", issue = "44286")]