Struct indexmap::map::IndexMap [−][src]
A hash table where the iteration order of the key-value pairs is independent of the hash values of the keys.
The interface is closely compatible with the standard HashMap
, but also
has additional features.
Order
The key-value pairs have a consistent order that is determined by the sequence of insertion and removal calls on the map. The order does not depend on the keys or the hash function at all.
All iterators traverse the map in the order.
The insertion order is preserved, with notable exceptions like the
.remove()
or .swap_remove()
methods. Methods such as .sort_by()
of
course result in a new order, depending on the sorting order.
Indices
The key-value pairs are indexed in a compact range without holes in the
range 0..self.len()
. For example, the method .get_full
looks up the
index for a key, and the method .get_index
looks up the key-value pair by
index.
Examples
use indexmap::IndexMap; // count the frequency of each letter in a sentence. let mut letters = IndexMap::new(); for ch in "a short treatise on fungi".chars() { *letters.entry(ch).or_insert(0) += 1; } assert_eq!(letters[&'s'], 2); assert_eq!(letters[&'t'], 3); assert_eq!(letters[&'u'], 1); assert_eq!(letters.get(&'y'), None);
Implementations
impl<K, V> IndexMap<K, V>
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pub fn new() -> Self
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Create a new map. (Does not allocate.)
pub fn with_capacity(n: usize) -> Self
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Create a new map with capacity for n
key-value pairs. (Does not
allocate if n
is zero.)
Computes in O(n) time.
impl<K, V, S> IndexMap<K, V, S>
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pub fn with_capacity_and_hasher(n: usize, hash_builder: S) -> Self
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Create a new map with capacity for n
key-value pairs. (Does not
allocate if n
is zero.)
Computes in O(n) time.
pub fn with_hasher(hash_builder: S) -> Self
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Create a new map with hash_builder
pub fn capacity(&self) -> usize
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Computes in O(1) time.
pub fn hasher(&self) -> &S
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Return a reference to the map’s BuildHasher
.
pub fn len(&self) -> usize
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Return the number of key-value pairs in the map.
Computes in O(1) time.
pub fn is_empty(&self) -> bool
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Returns true if the map contains no elements.
Computes in O(1) time.
pub fn iter(&self) -> Iter<'_, K, V>ⓘ
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Return an iterator over the key-value pairs of the map, in their order
pub fn iter_mut(&mut self) -> IterMut<'_, K, V>ⓘ
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Return an iterator over the key-value pairs of the map, in their order
pub fn keys(&self) -> Keys<'_, K, V>ⓘ
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Return an iterator over the keys of the map, in their order
pub fn values(&self) -> Values<'_, K, V>ⓘ
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Return an iterator over the values of the map, in their order
pub fn values_mut(&mut self) -> ValuesMut<'_, K, V>ⓘ
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Return an iterator over mutable references to the the values of the map, in their order
pub fn clear(&mut self)
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Remove all key-value pairs in the map, while preserving its capacity.
Computes in O(n) time.
pub fn truncate(&mut self, len: usize)
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Shortens the map, keeping the first len
elements and dropping the rest.
If len
is greater than the map’s current length, this has no effect.
pub fn drain<R>(&mut self, range: R) -> Drain<'_, K, V>ⓘ where
R: RangeBounds<usize>,
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R: RangeBounds<usize>,
Clears the IndexMap
in the given index range, returning those
key-value pairs as a drain iterator.
The range may be any type that implements RangeBounds<usize>
,
including all of the std::ops::Range*
types, or even a tuple pair of
Bound
start and end values. To drain the map entirely, use RangeFull
like map.drain(..)
.
This shifts down all entries following the drained range to fill the gap, and keeps the allocated memory for reuse.
Panics if the starting point is greater than the end point or if the end point is greater than the length of the map.
pub fn split_off(&mut self, at: usize) -> Self where
S: Clone,
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S: Clone,
Splits the collection into two at the given index.
Returns a newly allocated map containing the elements in the range
[at, len)
. After the call, the original map will be left containing
the elements [0, at)
with its previous capacity unchanged.
Panics if at > len
.
impl<K, V, S> IndexMap<K, V, S> where
K: Hash + Eq,
S: BuildHasher,
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K: Hash + Eq,
S: BuildHasher,
pub fn reserve(&mut self, additional: usize)
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Reserve capacity for additional
more key-value pairs.
Computes in O(n) time.
pub fn shrink_to_fit(&mut self)
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Shrink the capacity of the map as much as possible.
Computes in O(n) time.
pub fn insert(&mut self, key: K, value: V) -> Option<V>
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Insert a key-value pair in the map.
If an equivalent key already exists in the map: the key remains and
retains in its place in the order, its corresponding value is updated
with value
and the older value is returned inside Some(_)
.
If no equivalent key existed in the map: the new key-value pair is
inserted, last in order, and None
is returned.
Computes in O(1) time (amortized average).
See also entry
if you you want to insert or modify
or if you need to get the index of the corresponding key-value pair.
pub fn insert_full(&mut self, key: K, value: V) -> (usize, Option<V>)
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Insert a key-value pair in the map, and get their index.
If an equivalent key already exists in the map: the key remains and
retains in its place in the order, its corresponding value is updated
with value
and the older value is returned inside (index, Some(_))
.
If no equivalent key existed in the map: the new key-value pair is
inserted, last in order, and (index, None)
is returned.
Computes in O(1) time (amortized average).
See also entry
if you you want to insert or modify
or if you need to get the index of the corresponding key-value pair.
pub fn entry(&mut self, key: K) -> Entry<'_, K, V>
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Get the given key’s corresponding entry in the map for insertion and/or in-place manipulation.
Computes in O(1) time (amortized average).
pub fn contains_key<Q: ?Sized>(&self, key: &Q) -> bool where
Q: Hash + Equivalent<K>,
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Q: Hash + Equivalent<K>,
Return true
if an equivalent to key
exists in the map.
Computes in O(1) time (average).
pub fn get<Q: ?Sized>(&self, key: &Q) -> Option<&V> where
Q: Hash + Equivalent<K>,
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Q: Hash + Equivalent<K>,
Return a reference to the value stored for key
, if it is present,
else None
.
Computes in O(1) time (average).
pub fn get_key_value<Q: ?Sized>(&self, key: &Q) -> Option<(&K, &V)> where
Q: Hash + Equivalent<K>,
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Q: Hash + Equivalent<K>,
Return references to the key-value pair stored for key
,
if it is present, else None
.
Computes in O(1) time (average).
pub fn get_full<Q: ?Sized>(&self, key: &Q) -> Option<(usize, &K, &V)> where
Q: Hash + Equivalent<K>,
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Q: Hash + Equivalent<K>,
Return item index, key and value
pub fn get_index_of<Q: ?Sized>(&self, key: &Q) -> Option<usize> where
Q: Hash + Equivalent<K>,
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Q: Hash + Equivalent<K>,
Return item index, if it exists in the map
pub fn get_mut<Q: ?Sized>(&mut self, key: &Q) -> Option<&mut V> where
Q: Hash + Equivalent<K>,
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Q: Hash + Equivalent<K>,
pub fn get_full_mut<Q: ?Sized>(
&mut self,
key: &Q
) -> Option<(usize, &K, &mut V)> where
Q: Hash + Equivalent<K>,
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&mut self,
key: &Q
) -> Option<(usize, &K, &mut V)> where
Q: Hash + Equivalent<K>,
pub fn remove<Q: ?Sized>(&mut self, key: &Q) -> Option<V> where
Q: Hash + Equivalent<K>,
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Q: Hash + Equivalent<K>,
Remove the key-value pair equivalent to key
and return
its value.
NOTE: This is equivalent to .swap_remove(key)
, if you need to
preserve the order of the keys in the map, use .shift_remove(key)
instead.
Computes in O(1) time (average).
pub fn remove_entry<Q: ?Sized>(&mut self, key: &Q) -> Option<(K, V)> where
Q: Hash + Equivalent<K>,
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Q: Hash + Equivalent<K>,
Remove and return the key-value pair equivalent to key
.
NOTE: This is equivalent to .swap_remove_entry(key)
, if you need to
preserve the order of the keys in the map, use .shift_remove_entry(key)
instead.
Computes in O(1) time (average).
pub fn swap_remove<Q: ?Sized>(&mut self, key: &Q) -> Option<V> where
Q: Hash + Equivalent<K>,
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Q: Hash + Equivalent<K>,
Remove the key-value pair equivalent to key
and return
its value.
Like Vec::swap_remove
, the pair is removed by swapping it with the
last element of the map and popping it off. This perturbs
the position of what used to be the last element!
Return None
if key
is not in map.
Computes in O(1) time (average).
pub fn swap_remove_entry<Q: ?Sized>(&mut self, key: &Q) -> Option<(K, V)> where
Q: Hash + Equivalent<K>,
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Q: Hash + Equivalent<K>,
Remove and return the key-value pair equivalent to key
.
Like Vec::swap_remove
, the pair is removed by swapping it with the
last element of the map and popping it off. This perturbs
the position of what used to be the last element!
Return None
if key
is not in map.
Computes in O(1) time (average).
pub fn swap_remove_full<Q: ?Sized>(&mut self, key: &Q) -> Option<(usize, K, V)> where
Q: Hash + Equivalent<K>,
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Q: Hash + Equivalent<K>,
Remove the key-value pair equivalent to key
and return it and
the index it had.
Like Vec::swap_remove
, the pair is removed by swapping it with the
last element of the map and popping it off. This perturbs
the position of what used to be the last element!
Return None
if key
is not in map.
Computes in O(1) time (average).
pub fn shift_remove<Q: ?Sized>(&mut self, key: &Q) -> Option<V> where
Q: Hash + Equivalent<K>,
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Q: Hash + Equivalent<K>,
Remove the key-value pair equivalent to key
and return
its value.
Like Vec::remove
, the pair is removed by shifting all of the
elements that follow it, preserving their relative order.
This perturbs the index of all of those elements!
Return None
if key
is not in map.
Computes in O(n) time (average).
pub fn shift_remove_entry<Q: ?Sized>(&mut self, key: &Q) -> Option<(K, V)> where
Q: Hash + Equivalent<K>,
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Q: Hash + Equivalent<K>,
Remove and return the key-value pair equivalent to key
.
Like Vec::remove
, the pair is removed by shifting all of the
elements that follow it, preserving their relative order.
This perturbs the index of all of those elements!
Return None
if key
is not in map.
Computes in O(n) time (average).
pub fn shift_remove_full<Q: ?Sized>(&mut self, key: &Q) -> Option<(usize, K, V)> where
Q: Hash + Equivalent<K>,
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Q: Hash + Equivalent<K>,
Remove the key-value pair equivalent to key
and return it and
the index it had.
Like Vec::remove
, the pair is removed by shifting all of the
elements that follow it, preserving their relative order.
This perturbs the index of all of those elements!
Return None
if key
is not in map.
Computes in O(n) time (average).
pub fn pop(&mut self) -> Option<(K, V)>
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Remove the last key-value pair
Computes in O(1) time (average).
pub fn retain<F>(&mut self, keep: F) where
F: FnMut(&K, &mut V) -> bool,
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F: FnMut(&K, &mut V) -> bool,
Scan through each key-value pair in the map and keep those where the
closure keep
returns true
.
The elements are visited in order, and remaining elements keep their order.
Computes in O(n) time (average).
pub fn sort_keys(&mut self) where
K: Ord,
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K: Ord,
Sort the map’s key-value pairs by the default ordering of the keys.
See sort_by
for details.
pub fn sort_by<F>(&mut self, cmp: F) where
F: FnMut(&K, &V, &K, &V) -> Ordering,
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F: FnMut(&K, &V, &K, &V) -> Ordering,
Sort the map’s key-value pairs in place using the comparison
function compare
.
The comparison function receives two key and value pairs to compare (you can sort by keys or values or their combination as needed).
Computes in O(n log n + c) time and O(n) space where n is the length of the map and c the capacity. The sort is stable.
pub fn sorted_by<F>(self, cmp: F) -> IntoIter<K, V>ⓘ where
F: FnMut(&K, &V, &K, &V) -> Ordering,
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F: FnMut(&K, &V, &K, &V) -> Ordering,
Sort the key-value pairs of the map and return a by value iterator of the key-value pairs with the result.
The sort is stable.
pub fn reverse(&mut self)
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Reverses the order of the map’s key-value pairs in place.
Computes in O(n) time and O(1) space.
impl<K, V, S> IndexMap<K, V, S>
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pub fn get_index(&self, index: usize) -> Option<(&K, &V)>
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Get a key-value pair by index
Valid indices are 0 <= index < self.len()
Computes in O(1) time.
pub fn get_index_mut(&mut self, index: usize) -> Option<(&mut K, &mut V)>
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Get a key-value pair by index
Valid indices are 0 <= index < self.len()
Computes in O(1) time.
pub fn first(&self) -> Option<(&K, &V)>
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Get the first key-value pair
Computes in O(1) time.
pub fn first_mut(&mut self) -> Option<(&K, &mut V)>
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Get the first key-value pair, with mutable access to the value
Computes in O(1) time.
pub fn last(&self) -> Option<(&K, &V)>
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Get the last key-value pair
Computes in O(1) time.
pub fn last_mut(&mut self) -> Option<(&K, &mut V)>
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Get the last key-value pair, with mutable access to the value
Computes in O(1) time.
pub fn swap_remove_index(&mut self, index: usize) -> Option<(K, V)>
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Remove the key-value pair by index
Valid indices are 0 <= index < self.len()
Like Vec::swap_remove
, the pair is removed by swapping it with the
last element of the map and popping it off. This perturbs
the position of what used to be the last element!
Computes in O(1) time (average).
pub fn shift_remove_index(&mut self, index: usize) -> Option<(K, V)>
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Remove the key-value pair by index
Valid indices are 0 <= index < self.len()
Like Vec::remove
, the pair is removed by shifting all of the
elements that follow it, preserving their relative order.
This perturbs the index of all of those elements!
Computes in O(n) time (average).
pub fn swap_indices(&mut self, a: usize, b: usize)
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Swaps the position of two key-value pairs in the map.
Panics if a
or b
are out of bounds.
Trait Implementations
impl<K, V, S> Clone for IndexMap<K, V, S> where
K: Clone,
V: Clone,
S: Clone,
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K: Clone,
V: Clone,
S: Clone,
fn clone(&self) -> Self
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fn clone_from(&mut self, other: &Self)
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impl<K, V, S> Debug for IndexMap<K, V, S> where
K: Debug,
V: Debug,
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K: Debug,
V: Debug,
impl<K, V, S> Default for IndexMap<K, V, S> where
S: Default,
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S: Default,
impl<K, V, S> Eq for IndexMap<K, V, S> where
K: Eq + Hash,
V: Eq,
S: BuildHasher,
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K: Eq + Hash,
V: Eq,
S: BuildHasher,
impl<'a, K, V, S> Extend<(&'a K, &'a V)> for IndexMap<K, V, S> where
K: Hash + Eq + Copy,
V: Copy,
S: BuildHasher,
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K: Hash + Eq + Copy,
V: Copy,
S: BuildHasher,
fn extend<I: IntoIterator<Item = (&'a K, &'a V)>>(&mut self, iterable: I)
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Extend the map with all key-value pairs in the iterable.
See the first extend method for more details.
pub fn extend_one(&mut self, item: A)
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pub fn extend_reserve(&mut self, additional: usize)
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impl<K, V, S> Extend<(K, V)> for IndexMap<K, V, S> where
K: Hash + Eq,
S: BuildHasher,
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K: Hash + Eq,
S: BuildHasher,
fn extend<I: IntoIterator<Item = (K, V)>>(&mut self, iterable: I)
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Extend the map with all key-value pairs in the iterable.
This is equivalent to calling insert
for each of
them in order, which means that for keys that already existed
in the map, their value is updated but it keeps the existing order.
New keys are inserted in the order they appear in the sequence. If equivalents of a key occur more than once, the last corresponding value prevails.
pub fn extend_one(&mut self, item: A)
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pub fn extend_reserve(&mut self, additional: usize)
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impl<K, V, S> FromIterator<(K, V)> for IndexMap<K, V, S> where
K: Hash + Eq,
S: BuildHasher + Default,
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K: Hash + Eq,
S: BuildHasher + Default,
fn from_iter<I: IntoIterator<Item = (K, V)>>(iterable: I) -> Self
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Create an IndexMap
from the sequence of key-value pairs in the
iterable.
from_iter
uses the same logic as extend
. See
extend
for more details.
impl<K, V, Q: ?Sized, S> Index<&'_ Q> for IndexMap<K, V, S> where
Q: Hash + Equivalent<K>,
K: Hash + Eq,
S: BuildHasher,
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Q: Hash + Equivalent<K>,
K: Hash + Eq,
S: BuildHasher,
Access IndexMap
values corresponding to a key.
Examples
use indexmap::IndexMap; let mut map = IndexMap::new(); for word in "Lorem ipsum dolor sit amet".split_whitespace() { map.insert(word.to_lowercase(), word.to_uppercase()); } assert_eq!(map["lorem"], "LOREM"); assert_eq!(map["ipsum"], "IPSUM");
use indexmap::IndexMap; let mut map = IndexMap::new(); map.insert("foo", 1); println!("{:?}", map["bar"]); // panics!
type Output = V
The returned type after indexing.
fn index(&self, key: &Q) -> &V
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Returns a reference to the value corresponding to the supplied key
.
Panics if key
is not present in the map.
impl<K, V, S> Index<usize> for IndexMap<K, V, S>
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Access IndexMap
values at indexed positions.
Examples
use indexmap::IndexMap; let mut map = IndexMap::new(); for word in "Lorem ipsum dolor sit amet".split_whitespace() { map.insert(word.to_lowercase(), word.to_uppercase()); } assert_eq!(map[0], "LOREM"); assert_eq!(map[1], "IPSUM"); map.reverse(); assert_eq!(map[0], "AMET"); assert_eq!(map[1], "SIT"); map.sort_keys(); assert_eq!(map[0], "AMET"); assert_eq!(map[1], "DOLOR");
use indexmap::IndexMap; let mut map = IndexMap::new(); map.insert("foo", 1); println!("{:?}", map[10]); // panics!
type Output = V
The returned type after indexing.
fn index(&self, index: usize) -> &V
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Returns a reference to the value at the supplied index
.
Panics if index
is out of bounds.
impl<K, V, Q: ?Sized, S> IndexMut<&'_ Q> for IndexMap<K, V, S> where
Q: Hash + Equivalent<K>,
K: Hash + Eq,
S: BuildHasher,
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Q: Hash + Equivalent<K>,
K: Hash + Eq,
S: BuildHasher,
Access IndexMap
values corresponding to a key.
Mutable indexing allows changing / updating values of key-value pairs that are already present.
You can not insert new pairs with index syntax, use .insert()
.
Examples
use indexmap::IndexMap; let mut map = IndexMap::new(); for word in "Lorem ipsum dolor sit amet".split_whitespace() { map.insert(word.to_lowercase(), word.to_string()); } let lorem = &mut map["lorem"]; assert_eq!(lorem, "Lorem"); lorem.retain(char::is_lowercase); assert_eq!(map["lorem"], "orem");
use indexmap::IndexMap; let mut map = IndexMap::new(); map.insert("foo", 1); map["bar"] = 1; // panics!
fn index_mut(&mut self, key: &Q) -> &mut V
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Returns a mutable reference to the value corresponding to the supplied key
.
Panics if key
is not present in the map.
impl<K, V, S> IndexMut<usize> for IndexMap<K, V, S>
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Access IndexMap
values at indexed positions.
Mutable indexing allows changing / updating indexed values that are already present.
You can not insert new values with index syntax, use .insert()
.
Examples
use indexmap::IndexMap; let mut map = IndexMap::new(); for word in "Lorem ipsum dolor sit amet".split_whitespace() { map.insert(word.to_lowercase(), word.to_string()); } let lorem = &mut map[0]; assert_eq!(lorem, "Lorem"); lorem.retain(char::is_lowercase); assert_eq!(map["lorem"], "orem");
use indexmap::IndexMap; let mut map = IndexMap::new(); map.insert("foo", 1); map[10] = 1; // panics!
fn index_mut(&mut self, index: usize) -> &mut V
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Returns a mutable reference to the value at the supplied index
.
Panics if index
is out of bounds.
impl<'a, K, V, S> IntoIterator for &'a IndexMap<K, V, S>
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type Item = (&'a K, &'a V)
The type of the elements being iterated over.
type IntoIter = Iter<'a, K, V>
Which kind of iterator are we turning this into?
fn into_iter(self) -> Self::IntoIter
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impl<'a, K, V, S> IntoIterator for &'a mut IndexMap<K, V, S>
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type Item = (&'a K, &'a mut V)
The type of the elements being iterated over.
type IntoIter = IterMut<'a, K, V>
Which kind of iterator are we turning this into?
fn into_iter(self) -> Self::IntoIter
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impl<K, V, S> IntoIterator for IndexMap<K, V, S>
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type Item = (K, V)
The type of the elements being iterated over.
type IntoIter = IntoIter<K, V>
Which kind of iterator are we turning this into?
fn into_iter(self) -> Self::IntoIter
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impl<K, V, S> MutableKeys for IndexMap<K, V, S> where
K: Eq + Hash,
S: BuildHasher,
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K: Eq + Hash,
S: BuildHasher,
Opt-in mutable access to keys.
See MutableKeys
for more information.
type Key = K
type Value = V
fn get_full_mut2<Q: ?Sized>(
&mut self,
key: &Q
) -> Option<(usize, &mut K, &mut V)> where
Q: Hash + Equivalent<K>,
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&mut self,
key: &Q
) -> Option<(usize, &mut K, &mut V)> where
Q: Hash + Equivalent<K>,
fn retain2<F>(&mut self, keep: F) where
F: FnMut(&mut K, &mut V) -> bool,
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F: FnMut(&mut K, &mut V) -> bool,
fn __private_marker(&self) -> PrivateMarker
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impl<K, V1, S1, V2, S2> PartialEq<IndexMap<K, V2, S2>> for IndexMap<K, V1, S1> where
K: Hash + Eq,
V1: PartialEq<V2>,
S1: BuildHasher,
S2: BuildHasher,
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K: Hash + Eq,
V1: PartialEq<V2>,
S1: BuildHasher,
S2: BuildHasher,
Auto Trait Implementations
impl<K, V, S> RefUnwindSafe for IndexMap<K, V, S> where
K: RefUnwindSafe,
S: RefUnwindSafe,
V: RefUnwindSafe,
K: RefUnwindSafe,
S: RefUnwindSafe,
V: RefUnwindSafe,
impl<K, V, S> Send for IndexMap<K, V, S> where
K: Send,
S: Send,
V: Send,
K: Send,
S: Send,
V: Send,
impl<K, V, S> Sync for IndexMap<K, V, S> where
K: Sync,
S: Sync,
V: Sync,
K: Sync,
S: Sync,
V: Sync,
impl<K, V, S> Unpin for IndexMap<K, V, S> where
K: Unpin,
S: Unpin,
V: Unpin,
K: Unpin,
S: Unpin,
V: Unpin,
impl<K, V, S> UnwindSafe for IndexMap<K, V, S> where
K: UnwindSafe,
S: UnwindSafe,
V: UnwindSafe,
K: UnwindSafe,
S: UnwindSafe,
V: UnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,