Struct std::collections::hash_map::OccupiedEntry 1.0.0
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pub struct OccupiedEntry<'a, K: 'a, V: 'a> { /* fields omitted */ }
A view into an occupied entry in a HashMap
.
It is part of the Entry
enum.
Methods
impl<'a, K, V> OccupiedEntry<'a, K, V>
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pub fn key(&self) -> &K
1.10.0[src]
Gets a reference to the key in the entry.
Examples
use std::collections::HashMap; let mut map: HashMap<&str, u32> = HashMap::new(); map.entry("poneyland").or_insert(12); assert_eq!(map.entry("poneyland").key(), &"poneyland");Run
pub fn remove_entry(self) -> (K, V)
1.12.0[src]
Take the ownership of the key and value from the map.
Examples
use std::collections::HashMap; use std::collections::hash_map::Entry; let mut map: HashMap<&str, u32> = HashMap::new(); map.entry("poneyland").or_insert(12); if let Entry::Occupied(o) = map.entry("poneyland") { // We delete the entry from the map. o.remove_entry(); } assert_eq!(map.contains_key("poneyland"), false);Run
pub fn get(&self) -> &V
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Gets a reference to the value in the entry.
Examples
use std::collections::HashMap; use std::collections::hash_map::Entry; let mut map: HashMap<&str, u32> = HashMap::new(); map.entry("poneyland").or_insert(12); if let Entry::Occupied(o) = map.entry("poneyland") { assert_eq!(o.get(), &12); }Run
pub fn get_mut(&mut self) -> &mut V
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Gets a mutable reference to the value in the entry.
Examples
use std::collections::HashMap; use std::collections::hash_map::Entry; let mut map: HashMap<&str, u32> = HashMap::new(); map.entry("poneyland").or_insert(12); assert_eq!(map["poneyland"], 12); if let Entry::Occupied(mut o) = map.entry("poneyland") { *o.get_mut() += 10; } assert_eq!(map["poneyland"], 22);Run
pub fn into_mut(self) -> &'a mut V
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Converts the OccupiedEntry into a mutable reference to the value in the entry with a lifetime bound to the map itself.
Examples
use std::collections::HashMap; use std::collections::hash_map::Entry; let mut map: HashMap<&str, u32> = HashMap::new(); map.entry("poneyland").or_insert(12); assert_eq!(map["poneyland"], 12); if let Entry::Occupied(o) = map.entry("poneyland") { *o.into_mut() += 10; } assert_eq!(map["poneyland"], 22);Run
pub fn insert(&mut self, value: V) -> V
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Sets the value of the entry, and returns the entry's old value.
Examples
use std::collections::HashMap; use std::collections::hash_map::Entry; let mut map: HashMap<&str, u32> = HashMap::new(); map.entry("poneyland").or_insert(12); if let Entry::Occupied(mut o) = map.entry("poneyland") { assert_eq!(o.insert(15), 12); } assert_eq!(map["poneyland"], 15);Run
pub fn remove(self) -> V
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Takes the value out of the entry, and returns it.
Examples
use std::collections::HashMap; use std::collections::hash_map::Entry; let mut map: HashMap<&str, u32> = HashMap::new(); map.entry("poneyland").or_insert(12); if let Entry::Occupied(o) = map.entry("poneyland") { assert_eq!(o.remove(), 12); } assert_eq!(map.contains_key("poneyland"), false);Run
pub fn replace(self, value: V) -> (K, V)
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Replaces the entry, returning the old key and value.
Examples
#![feature(map_entry_replace)] use std::collections::HashMap; use std::collections::hash_map::Entry; let mut map: HashMap<String, u32> = HashMap::new(); map.insert("poneyland".to_string(), 15); if let Entry::Occupied(entry) = map.entry("poneyland".to_string()) { let (old_key, old_value): (String, u32) = entry.replace(16); assert_eq!(old_key, "poneyland"); assert_eq!(old_value, 15); } assert_eq!(map.get("poneyland"), Some(&16));Run