Struct linked_hash_map::LinkedHashMap [] [src]

pub struct LinkedHashMap<K, V, S = RandomState> { /* fields omitted */ }

A linked hash map.

Methods

impl<K: Hash + Eq, V> LinkedHashMap<K, V>
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Creates a linked hash map.

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Creates an empty linked hash map with the given initial capacity.

impl<K: Hash + Eq, V, S: BuildHasher> LinkedHashMap<K, V, S>
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Creates an empty linked hash map with the given initial hash builder.

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Creates an empty linked hash map with the given initial capacity and hash builder.

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Reserves capacity for at least additional more elements to be inserted into the map. The map may reserve more space to avoid frequent allocations.

Panics

Panics if the new allocation size overflows usize.

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Shrinks the capacity of the map as much as possible. It will drop down as much as possible while maintaining the internal rules and possibly leaving some space in accordance with the resize policy.

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Gets the given key's corresponding entry in the map for in-place manipulation.

Examples

use linked_hash_map::LinkedHashMap;

let mut letters = LinkedHashMap::new();

for ch in "a short treatise on fungi".chars() {
    let counter = letters.entry(ch).or_insert(0);
    *counter += 1;
}

assert_eq!(letters[&'s'], 2);
assert_eq!(letters[&'t'], 3);
assert_eq!(letters[&'u'], 1);
assert_eq!(letters.get(&'y'), None);

Important traits for Entries<'a, K, V, S>
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Returns an iterator visiting all entries in insertion order. Iterator element type is OccupiedEntry<K, V, S>. Allows for removal as well as replacing the entry.

Examples

use linked_hash_map::LinkedHashMap;

let mut map = LinkedHashMap::new();
map.insert("a", 10);
map.insert("c", 30);
map.insert("b", 20);

{
    let mut iter = map.entries();
    let mut entry = iter.next().unwrap();
    assert_eq!(&"a", entry.key());
    *entry.get_mut() = 17;
}

assert_eq!(&17, map.get(&"a").unwrap());

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Inserts a key-value pair into the map. If the key already existed, the old value is returned.

Examples

use linked_hash_map::LinkedHashMap;
let mut map = LinkedHashMap::new();

map.insert(1, "a");
map.insert(2, "b");
assert_eq!(map[&1], "a");
assert_eq!(map[&2], "b");

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Checks if the map contains the given key.

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Returns the value corresponding to the key in the map.

Examples

use linked_hash_map::LinkedHashMap;
let mut map = LinkedHashMap::new();

map.insert(1, "a");
map.insert(2, "b");
map.insert(2, "c");
map.insert(3, "d");

assert_eq!(map.get(&1), Some(&"a"));
assert_eq!(map.get(&2), Some(&"c"));

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Returns the mutable reference corresponding to the key in the map.

Examples

use linked_hash_map::LinkedHashMap;
let mut map = LinkedHashMap::new();

map.insert(1, "a");
map.insert(2, "b");

*map.get_mut(&1).unwrap() = "c";
assert_eq!(map.get(&1), Some(&"c"));

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Returns the value corresponding to the key in the map.

If value is found, it is moved to the end of the list. This operation can be used in implemenation of LRU cache.

Examples

use linked_hash_map::LinkedHashMap;
let mut map = LinkedHashMap::new();

map.insert(1, "a");
map.insert(2, "b");
map.insert(3, "d");

assert_eq!(map.get_refresh(&2), Some(&mut "b"));

assert_eq!((&2, &"b"), map.iter().rev().next().unwrap());

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Removes and returns the value corresponding to the key from the map.

Examples

use linked_hash_map::LinkedHashMap;
let mut map = LinkedHashMap::new();

map.insert(2, "a");

assert_eq!(map.remove(&1), None);
assert_eq!(map.remove(&2), Some("a"));
assert_eq!(map.remove(&2), None);
assert_eq!(map.len(), 0);

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Returns the maximum number of key-value pairs the map can hold without reallocating.

Examples

use linked_hash_map::LinkedHashMap;
let mut map: LinkedHashMap<i32, &str> = LinkedHashMap::new();
let capacity = map.capacity();

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Removes the first entry.

Can be used in implementation of LRU cache.

Examples

use linked_hash_map::LinkedHashMap;
let mut map = LinkedHashMap::new();
map.insert(1, 10);
map.insert(2, 20);
map.pop_front();
assert_eq!(map.get(&1), None);
assert_eq!(map.get(&2), Some(&20));

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Gets the first entry.

Examples

use linked_hash_map::LinkedHashMap;
let mut map = LinkedHashMap::new();
map.insert(1, 10);
map.insert(2, 20);
assert_eq!(map.front(), Some((&1, &10)));

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Removes the last entry.

Examples

use linked_hash_map::LinkedHashMap;
let mut map = LinkedHashMap::new();
map.insert(1, 10);
map.insert(2, 20);
map.pop_back();
assert_eq!(map.get(&1), Some(&10));
assert_eq!(map.get(&2), None);

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Gets the last entry.

Examples

use linked_hash_map::LinkedHashMap;
let mut map = LinkedHashMap::new();
map.insert(1, 10);
map.insert(2, 20);
assert_eq!(map.back(), Some((&2, &20)));

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Returns the number of key-value pairs in the map.

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Returns whether the map is currently empty.

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Returns a reference to the map's hasher.

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Clears the map of all key-value pairs.

Important traits for Iter<'a, K, V>
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Returns a double-ended iterator visiting all key-value pairs in order of insertion. Iterator element type is (&'a K, &'a V)

Examples

use linked_hash_map::LinkedHashMap;

let mut map = LinkedHashMap::new();
map.insert("a", 10);
map.insert("c", 30);
map.insert("b", 20);

let mut iter = map.iter();
assert_eq!((&"a", &10), iter.next().unwrap());
assert_eq!((&"c", &30), iter.next().unwrap());
assert_eq!((&"b", &20), iter.next().unwrap());
assert_eq!(None, iter.next());

Important traits for IterMut<'a, K, V>
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Returns a double-ended iterator visiting all key-value pairs in order of insertion. Iterator element type is (&'a K, &'a mut V)

Examples

use linked_hash_map::LinkedHashMap;

let mut map = LinkedHashMap::new();
map.insert("a", 10);
map.insert("c", 30);
map.insert("b", 20);

{
    let mut iter = map.iter_mut();
    let mut entry = iter.next().unwrap();
    assert_eq!(&"a", entry.0);
    *entry.1 = 17;
}

assert_eq!(&17, map.get(&"a").unwrap());

Important traits for Keys<'a, K, V>
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Returns a double-ended iterator visiting all key in order of insertion.

Examples

use linked_hash_map::LinkedHashMap;

let mut map = LinkedHashMap::new();
map.insert('a', 10);
map.insert('c', 30);
map.insert('b', 20);

let mut keys = map.keys();
assert_eq!(&'a', keys.next().unwrap());
assert_eq!(&'c', keys.next().unwrap());
assert_eq!(&'b', keys.next().unwrap());
assert_eq!(None, keys.next());

Important traits for Values<'a, K, V>
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Returns a double-ended iterator visiting all values in order of insertion.

Examples

use linked_hash_map::LinkedHashMap;

let mut map = LinkedHashMap::new();
map.insert('a', 10);
map.insert('c', 30);
map.insert('b', 20);

let mut values = map.values();
assert_eq!(&10, values.next().unwrap());
assert_eq!(&30, values.next().unwrap());
assert_eq!(&20, values.next().unwrap());
assert_eq!(None, values.next());

Trait Implementations

impl<'a, K, V, S, Q: ?Sized> Index<&'a Q> for LinkedHashMap<K, V, S> where
    K: Hash + Eq + Borrow<Q>,
    S: BuildHasher,
    Q: Eq + Hash
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The returned type after indexing.

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Performs the indexing (container[index]) operation.

impl<'a, K, V, S, Q: ?Sized> IndexMut<&'a Q> for LinkedHashMap<K, V, S> where
    K: Hash + Eq + Borrow<Q>,
    S: BuildHasher,
    Q: Eq + Hash
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Performs the mutable indexing (container[index]) operation.

impl<K: Hash + Eq + Clone, V: Clone, S: BuildHasher + Clone> Clone for LinkedHashMap<K, V, S>
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Returns a copy of the value. Read more

1.0.0
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Performs copy-assignment from source. Read more

impl<K: Hash + Eq, V, S: BuildHasher + Default> Default for LinkedHashMap<K, V, S>
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Returns the "default value" for a type. Read more

impl<K: Hash + Eq, V, S: BuildHasher> Extend<(K, V)> for LinkedHashMap<K, V, S>
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Extends a collection with the contents of an iterator. Read more

impl<'a, K, V, S> Extend<(&'a K, &'a V)> for LinkedHashMap<K, V, S> where
    K: 'a + Hash + Eq + Copy,
    V: 'a + Copy,
    S: BuildHasher
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Extends a collection with the contents of an iterator. Read more

impl<K: Hash + Eq, V, S: BuildHasher + Default> FromIterator<(K, V)> for LinkedHashMap<K, V, S>
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Creates a value from an iterator. Read more

impl<A: Debug + Hash + Eq, B: Debug, S: BuildHasher> Debug for LinkedHashMap<A, B, S>
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Returns a string that lists the key-value pairs in insertion order.

impl<K: Hash + Eq, V: PartialEq, S: BuildHasher> PartialEq for LinkedHashMap<K, V, S>
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This method tests for self and other values to be equal, and is used by ==. Read more

1.0.0
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This method tests for !=.

impl<K: Hash + Eq, V: Eq, S: BuildHasher> Eq for LinkedHashMap<K, V, S>
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impl<K: Hash + Eq + PartialOrd, V: PartialOrd, S: BuildHasher> PartialOrd for LinkedHashMap<K, V, S>
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This method returns an ordering between self and other values if one exists. Read more

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This method tests less than (for self and other) and is used by the < operator. Read more

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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

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This method tests greater than (for self and other) and is used by the > operator. Read more

impl<K: Hash + Eq + Ord, V: Ord, S: BuildHasher> Ord for LinkedHashMap<K, V, S>
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This method returns an Ordering between self and other. Read more

1.21.0
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Compares and returns the maximum of two values. Read more

1.21.0
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Compares and returns the minimum of two values. Read more

impl<K: Hash + Eq, V: Hash, S: BuildHasher> Hash for LinkedHashMap<K, V, S>
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Feeds this value into the given [Hasher]. Read more

1.3.0
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Feeds a slice of this type into the given [Hasher]. Read more

impl<K: Send, V: Send, S: Send> Send for LinkedHashMap<K, V, S>
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impl<K: Sync, V: Sync, S: Sync> Sync for LinkedHashMap<K, V, S>
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impl<K, V, S> Drop for LinkedHashMap<K, V, S>
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Executes the destructor for this type. Read more

impl<'a, K: Hash + Eq, V, S: BuildHasher> IntoIterator for &'a LinkedHashMap<K, V, S>
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The type of the elements being iterated over.

Which kind of iterator are we turning this into?

Important traits for Iter<'a, K, V>
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Creates an iterator from a value. Read more

impl<'a, K: Hash + Eq, V, S: BuildHasher> IntoIterator for &'a mut LinkedHashMap<K, V, S>
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The type of the elements being iterated over.

Which kind of iterator are we turning this into?

Important traits for IterMut<'a, K, V>
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Creates an iterator from a value. Read more

impl<K: Hash + Eq, V, S: BuildHasher> IntoIterator for LinkedHashMap<K, V, S>
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The type of the elements being iterated over.

Which kind of iterator are we turning this into?

Important traits for IntoIter<K, V>
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Creates an iterator from a value. Read more