pub struct IndexMap<K, V, S = RandomState> {
    pub(crate) core: IndexMapCore<K, V>,
    hash_builder: S,
}
Expand description

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);

Fields§

§core: IndexMapCore<K, V>§hash_builder: S

Implementations§

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impl<K, V> IndexMap<K, V>

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pub fn new() -> IndexMap<K, V>

Create a new map. (Does not allocate.)

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pub fn with_capacity(n: usize) -> IndexMap<K, V>

Create a new map with capacity for n key-value pairs. (Does not allocate if n is zero.)

Computes in O(n) time.

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impl<K, V, S> IndexMap<K, V, S>

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pub fn with_capacity_and_hasher(n: usize, hash_builder: S) -> IndexMap<K, V, S>

Create a new map with capacity for n key-value pairs. (Does not allocate if n is zero.)

Computes in O(n) time.

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pub const fn with_hasher(hash_builder: S) -> IndexMap<K, V, S>

Create a new map with hash_builder.

This function is const, so it can be called in static contexts.

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pub fn capacity(&self) -> usize

Computes in O(1) time.

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pub fn hasher(&self) -> &S

Return a reference to the map’s BuildHasher.

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pub fn len(&self) -> usize

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

Computes in O(1) time.

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pub fn is_empty(&self) -> bool

Returns true if the map contains no elements.

Computes in O(1) time.

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pub fn iter(&self) -> Iter<'_, K, V>

Return an iterator over the key-value pairs of the map, in their order

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pub fn iter_mut(&mut self) -> IterMut<'_, K, V>

Return an iterator over the key-value pairs of the map, in their order

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pub fn keys(&self) -> Keys<'_, K, V>

Return an iterator over the keys of the map, in their order

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pub fn into_keys(self) -> IntoKeys<K, V>

Return an owning iterator over the keys of the map, in their order

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pub fn values(&self) -> Values<'_, K, V>

Return an iterator over the values of the map, in their order

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pub fn values_mut(&mut self) -> ValuesMut<'_, K, V>

Return an iterator over mutable references to the values of the map, in their order

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pub fn into_values(self) -> IntoValues<K, V>

Return an owning iterator over the values of the map, in their order

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pub fn clear(&mut self)

Remove all key-value pairs in the map, while preserving its capacity.

Computes in O(n) time.

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pub fn truncate(&mut self, len: usize)

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.

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pub fn drain<R>(&mut self, range: R) -> Drain<'_, K, V>
where 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.

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pub fn split_off(&mut self, at: usize) -> IndexMap<K, V, S>
where 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.

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impl<K, V, S> IndexMap<K, V, S>
where K: Hash + Eq, S: BuildHasher,

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pub fn reserve(&mut self, additional: usize)

Reserve capacity for additional more key-value pairs.

Computes in O(n) time.

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pub fn reserve_exact(&mut self, additional: usize)

Reserve capacity for additional more key-value pairs, without over-allocating.

Unlike reserve, this does not deliberately over-allocate the entry capacity to avoid frequent re-allocations. However, the underlying data structures may still have internal capacity requirements, and the allocator itself may give more space than requested, so this cannot be relied upon to be precisely minimal.

Computes in O(n) time.

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pub fn try_reserve(&mut self, additional: usize) -> Result<(), TryReserveError>

Try to reserve capacity for additional more key-value pairs.

Computes in O(n) time.

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pub fn try_reserve_exact( &mut self, additional: usize ) -> Result<(), TryReserveError>

Try to reserve capacity for additional more key-value pairs, without over-allocating.

Unlike try_reserve, this does not deliberately over-allocate the entry capacity to avoid frequent re-allocations. However, the underlying data structures may still have internal capacity requirements, and the allocator itself may give more space than requested, so this cannot be relied upon to be precisely minimal.

Computes in O(n) time.

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pub fn shrink_to_fit(&mut self)

Shrink the capacity of the map as much as possible.

Computes in O(n) time.

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pub fn shrink_to(&mut self, min_capacity: usize)

Shrink the capacity of the map with a lower limit.

Computes in O(n) time.

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pub fn insert(&mut self, key: K, value: V) -> Option<V>

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.

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pub fn insert_full(&mut self, key: K, value: V) -> (usize, Option<V>)

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.

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pub fn entry(&mut self, key: K) -> Entry<'_, K, V>

Get the given key’s corresponding entry in the map for insertion and/or in-place manipulation.

Computes in O(1) time (amortized average).

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pub fn contains_key<Q>(&self, key: &Q) -> bool
where Q: Hash + Equivalent<K> + ?Sized,

Return true if an equivalent to key exists in the map.

Computes in O(1) time (average).

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pub fn get<Q>(&self, key: &Q) -> Option<&V>
where Q: Hash + Equivalent<K> + ?Sized,

Return a reference to the value stored for key, if it is present, else None.

Computes in O(1) time (average).

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pub fn get_key_value<Q>(&self, key: &Q) -> Option<(&K, &V)>
where Q: Hash + Equivalent<K> + ?Sized,

Return references to the key-value pair stored for key, if it is present, else None.

Computes in O(1) time (average).

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pub fn get_full<Q>(&self, key: &Q) -> Option<(usize, &K, &V)>
where Q: Hash + Equivalent<K> + ?Sized,

Return item index, key and value

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pub fn get_index_of<Q>(&self, key: &Q) -> Option<usize>
where Q: Hash + Equivalent<K> + ?Sized,

Return item index, if it exists in the map

Computes in O(1) time (average).

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pub fn get_mut<Q>(&mut self, key: &Q) -> Option<&mut V>
where Q: Hash + Equivalent<K> + ?Sized,

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pub fn get_full_mut<Q>(&mut self, key: &Q) -> Option<(usize, &K, &mut V)>
where Q: Hash + Equivalent<K> + ?Sized,

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pub fn remove<Q>(&mut self, key: &Q) -> Option<V>
where Q: Hash + Equivalent<K> + ?Sized,

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).

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pub fn remove_entry<Q>(&mut self, key: &Q) -> Option<(K, V)>
where Q: Hash + Equivalent<K> + ?Sized,

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).

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pub fn swap_remove<Q>(&mut self, key: &Q) -> Option<V>
where Q: Hash + Equivalent<K> + ?Sized,

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).

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pub fn swap_remove_entry<Q>(&mut self, key: &Q) -> Option<(K, V)>
where Q: Hash + Equivalent<K> + ?Sized,

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).

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pub fn swap_remove_full<Q>(&mut self, key: &Q) -> Option<(usize, K, V)>
where Q: Hash + Equivalent<K> + ?Sized,

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).

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pub fn shift_remove<Q>(&mut self, key: &Q) -> Option<V>
where Q: Hash + Equivalent<K> + ?Sized,

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).

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pub fn shift_remove_entry<Q>(&mut self, key: &Q) -> Option<(K, V)>
where Q: Hash + Equivalent<K> + ?Sized,

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).

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pub fn shift_remove_full<Q>(&mut self, key: &Q) -> Option<(usize, K, V)>
where Q: Hash + Equivalent<K> + ?Sized,

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).

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pub fn pop(&mut self) -> Option<(K, V)>

Remove the last key-value pair

This preserves the order of the remaining elements.

Computes in O(1) time (average).

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pub fn retain<F>(&mut self, keep: F)
where 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).

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pub fn sort_keys(&mut self)
where K: Ord,

Sort the map’s key-value pairs by the default ordering of the keys.

See sort_by for details.

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pub fn sort_by<F>(&mut self, cmp: F)
where F: FnMut(&K, &V, &K, &V) -> Ordering,

Sort the map’s key-value pairs in place using the comparison function cmp.

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.

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pub fn sorted_by<F>(self, cmp: F) -> IntoIter<K, V>
where 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.

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pub fn sort_unstable_keys(&mut self)
where K: Ord,

Sort the map’s key-value pairs by the default ordering of the keys, but may not preserve the order of equal elements.

See sort_unstable_by for details.

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pub fn sort_unstable_by<F>(&mut self, cmp: F)
where F: FnMut(&K, &V, &K, &V) -> Ordering,

Sort the map’s key-value pairs in place using the comparison function cmp, but may not preserve the order of equal elements.

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 where n is the length of the map and c is the capacity. The sort is unstable.

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pub fn sorted_unstable_by<F>(self, cmp: F) -> IntoIter<K, V>
where 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 unstable.

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pub fn sort_by_cached_key<T, F>(&mut self, sort_key: F)
where T: Ord, F: FnMut(&K, &V) -> T,

Sort the map’s key-value pairs in place using a sort-key extraction function.

During sorting, the function is called at most once per entry, by using temporary storage to remember the results of its evaluation. The order of calls to the function is unspecified and may change between versions of indexmap or the standard library.

Computes in O(m n + n log n + c) time () and O(n) space, where the function is O(m), n is the length of the map, and c the capacity. The sort is stable.

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pub fn reverse(&mut self)

Reverses the order of the map’s key-value pairs in place.

Computes in O(n) time and O(1) space.

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impl<K, V, S> IndexMap<K, V, S>

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pub fn as_slice(&self) -> &Slice<K, V>

Returns a slice of all the key-value pairs in the map.

Computes in O(1) time.

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pub fn as_mut_slice(&mut self) -> &mut Slice<K, V>

Returns a mutable slice of all the key-value pairs in the map.

Computes in O(1) time.

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pub fn into_boxed_slice(self) -> Box<Slice<K, V>>

Converts into a boxed slice of all the key-value pairs in the map.

Note that this will drop the inner hash table and any excess capacity.

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pub fn get_index(&self, index: usize) -> Option<(&K, &V)>

Get a key-value pair by index

Valid indices are 0 <= index < self.len()

Computes in O(1) time.

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pub fn get_index_mut(&mut self, index: usize) -> Option<(&K, &mut V)>

Get a key-value pair by index

Valid indices are 0 <= index < self.len()

Computes in O(1) time.

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pub fn get_range<R>(&self, range: R) -> Option<&Slice<K, V>>
where R: RangeBounds<usize>,

Returns a slice of key-value pairs in the given range of indices.

Valid indices are 0 <= index < self.len()

Computes in O(1) time.

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pub fn get_range_mut<R>(&mut self, range: R) -> Option<&mut Slice<K, V>>
where R: RangeBounds<usize>,

Returns a mutable slice of key-value pairs in the given range of indices.

Valid indices are 0 <= index < self.len()

Computes in O(1) time.

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pub fn first(&self) -> Option<(&K, &V)>

Get the first key-value pair

Computes in O(1) time.

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pub fn first_mut(&mut self) -> Option<(&K, &mut V)>

Get the first key-value pair, with mutable access to the value

Computes in O(1) time.

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pub fn last(&self) -> Option<(&K, &V)>

Get the last key-value pair

Computes in O(1) time.

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pub fn last_mut(&mut self) -> Option<(&K, &mut V)>

Get the last key-value pair, with mutable access to the value

Computes in O(1) time.

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pub fn swap_remove_index(&mut self, index: usize) -> Option<(K, V)>

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).

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pub fn shift_remove_index(&mut self, index: usize) -> Option<(K, V)>

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).

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pub fn move_index(&mut self, from: usize, to: usize)

Moves the position of a key-value pair from one index to another by shifting all other pairs in-between.

  • If from < to, the other pairs will shift down while the targeted pair moves up.
  • If from > to, the other pairs will shift up while the targeted pair moves down.

Panics if from or to are out of bounds.

Computes in O(n) time (average).

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pub fn swap_indices(&mut self, a: usize, b: usize)

Swaps the position of two key-value pairs in the map.

Panics if a or b are out of bounds.

Trait Implementations§

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impl<X, K, V> Categorize<X> for IndexMap<K, V>
where X: CustomValueKind,

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impl<K, V, S> Clone for IndexMap<K, V, S>
where K: Clone, V: Clone, S: Clone,

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fn clone(&self) -> IndexMap<K, V, S>

Returns a copy of the value. Read more
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fn clone_from(&mut self, other: &IndexMap<K, V, S>)

Performs copy-assignment from source. Read more
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impl<K, V, S> Debug for IndexMap<K, V, S>
where K: Debug, V: Debug,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl<X, D, K, V> Decode<X, D> for IndexMap<K, V>
where X: CustomValueKind, D: Decoder<X>, K: Decode<X, D> + Categorize<X> + Hash + Eq, V: Decode<X, D> + Categorize<X>,

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fn decode_body_with_value_kind( decoder: &mut D, value_kind: ValueKind<X> ) -> Result<IndexMap<K, V>, DecodeError>

Decodes the type from the decoder, which should match a preloaded value kind. Read more
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impl<K, V, S> Default for IndexMap<K, V, S>
where S: Default,

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fn default() -> IndexMap<K, V, S>

Return an empty IndexMap

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impl<C, K, V> Describe<C> for IndexMap<K, V>
where C: CustomTypeKind<RustTypeId>, K: Describe<C>, V: Describe<C>,

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const TYPE_ID: RustTypeId = BTreeMap<K, V>::TYPE_ID

The TYPE_ID should give a unique identifier for its SBOR schema type. An SBOR schema type capture details about the SBOR payload, how it should be interpreted, validated and displayed. Read more
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fn type_data() -> TypeData<C, RustTypeId>

Returns the local schema for the given type. Read more
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fn add_all_dependencies(aggregator: &mut TypeAggregator<C>)

For each type referenced in get_local_type_data, we need to ensure that the type and all of its own references get added to the aggregator. Read more
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impl<'de, K, V, S> Deserialize<'de> for IndexMap<K, V, S>
where K: Deserialize<'de> + Eq + Hash, V: Deserialize<'de>, S: Default + BuildHasher,

Requires crate feature "serde"

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fn deserialize<D>( deserializer: D ) -> Result<IndexMap<K, V, S>, <D as Deserializer<'de>>::Error>
where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl<X, E, K, V> Encode<X, E> for IndexMap<K, V>
where X: CustomValueKind, E: Encoder<X>, K: Encode<X, E> + Categorize<X> + Hash + Eq + PartialEq, V: Encode<X, E> + Categorize<X>,

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fn encode_value_kind(&self, encoder: &mut E) -> Result<(), EncodeError>

Encodes the SBOR value’s kind to the encoder
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fn encode_body(&self, encoder: &mut E) -> Result<(), EncodeError>

Encodes the SBOR body of the type to the encoder. Read more
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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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fn extend<I>(&mut self, iterable: I)
where I: IntoIterator<Item = (&'a K, &'a V)>,

Extend the map with all key-value pairs in the iterable.

See the first extend method for more details.

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fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)
Extends a collection with exactly one element.
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fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)
Reserves capacity in a collection for the given number of additional elements. Read more
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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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fn extend<I>(&mut self, iterable: I)
where I: IntoIterator<Item = (K, V)>,

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.

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fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)
Extends a collection with exactly one element.
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fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)
Reserves capacity in a collection for the given number of additional elements. Read more
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impl<K, V, const N: usize> From<[(K, V); N]> for IndexMap<K, V>
where K: Hash + Eq,

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fn from(arr: [(K, V); N]) -> IndexMap<K, V>

§Examples
use indexmap::IndexMap;

let map1 = IndexMap::from([(1, 2), (3, 4)]);
let map2: IndexMap<_, _> = [(1, 2), (3, 4)].into();
assert_eq!(map1, map2);
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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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fn from_iter<I>(iterable: I) -> IndexMap<K, V, S>
where I: IntoIterator<Item = (K, V)>,

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.

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impl<K, V, Q, S> Index<&Q> for IndexMap<K, V, S>
where Q: Hash + Equivalent<K> + ?Sized, 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!
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fn index(&self, key: &Q) -> &V

Returns a reference to the value corresponding to the supplied key.

Panics if key is not present in the map.

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type Output = V

The returned type after indexing.
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impl<K, V, S> Index<(Bound<usize>, Bound<usize>)> for IndexMap<K, V, S>

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type Output = Slice<K, V>

The returned type after indexing.
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fn index( &self, range: (Bound<usize>, Bound<usize>) ) -> &<IndexMap<K, V, S> as Index<(Bound<usize>, Bound<usize>)>>::Output

Performs the indexing (container[index]) operation. Read more
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impl<K, V, S> Index<Range<usize>> for IndexMap<K, V, S>

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type Output = Slice<K, V>

The returned type after indexing.
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fn index( &self, range: Range<usize> ) -> &<IndexMap<K, V, S> as Index<Range<usize>>>::Output

Performs the indexing (container[index]) operation. Read more
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impl<K, V, S> Index<RangeFrom<usize>> for IndexMap<K, V, S>

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type Output = Slice<K, V>

The returned type after indexing.
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fn index( &self, range: RangeFrom<usize> ) -> &<IndexMap<K, V, S> as Index<RangeFrom<usize>>>::Output

Performs the indexing (container[index]) operation. Read more
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impl<K, V, S> Index<RangeFull> for IndexMap<K, V, S>

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type Output = Slice<K, V>

The returned type after indexing.
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fn index( &self, range: RangeFull ) -> &<IndexMap<K, V, S> as Index<RangeFull>>::Output

Performs the indexing (container[index]) operation. Read more
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impl<K, V, S> Index<RangeInclusive<usize>> for IndexMap<K, V, S>

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type Output = Slice<K, V>

The returned type after indexing.
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fn index( &self, range: RangeInclusive<usize> ) -> &<IndexMap<K, V, S> as Index<RangeInclusive<usize>>>::Output

Performs the indexing (container[index]) operation. Read more
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impl<K, V, S> Index<RangeTo<usize>> for IndexMap<K, V, S>

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type Output = Slice<K, V>

The returned type after indexing.
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fn index( &self, range: RangeTo<usize> ) -> &<IndexMap<K, V, S> as Index<RangeTo<usize>>>::Output

Performs the indexing (container[index]) operation. Read more
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impl<K, V, S> Index<RangeToInclusive<usize>> for IndexMap<K, V, S>

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type Output = Slice<K, V>

The returned type after indexing.
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fn index( &self, range: RangeToInclusive<usize> ) -> &<IndexMap<K, V, S> as Index<RangeToInclusive<usize>>>::Output

Performs the indexing (container[index]) operation. Read more
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impl<K, V, S> Index<usize> for IndexMap<K, V, S>

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!
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fn index(&self, index: usize) -> &V

Returns a reference to the value at the supplied index.

Panics if index is out of bounds.

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type Output = V

The returned type after indexing.
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impl<K, V, Q, S> IndexMut<&Q> for IndexMap<K, V, S>
where Q: Hash + Equivalent<K> + ?Sized, 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!
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fn index_mut(&mut self, key: &Q) -> &mut V

Returns a mutable reference to the value corresponding to the supplied key.

Panics if key is not present in the map.

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impl<K, V, S> IndexMut<(Bound<usize>, Bound<usize>)> for IndexMap<K, V, S>

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fn index_mut( &mut self, range: (Bound<usize>, Bound<usize>) ) -> &mut <IndexMap<K, V, S> as Index<(Bound<usize>, Bound<usize>)>>::Output

Performs the mutable indexing (container[index]) operation. Read more
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impl<K, V, S> IndexMut<Range<usize>> for IndexMap<K, V, S>

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fn index_mut( &mut self, range: Range<usize> ) -> &mut <IndexMap<K, V, S> as Index<Range<usize>>>::Output

Performs the mutable indexing (container[index]) operation. Read more
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impl<K, V, S> IndexMut<RangeFrom<usize>> for IndexMap<K, V, S>

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fn index_mut( &mut self, range: RangeFrom<usize> ) -> &mut <IndexMap<K, V, S> as Index<RangeFrom<usize>>>::Output

Performs the mutable indexing (container[index]) operation. Read more
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impl<K, V, S> IndexMut<RangeFull> for IndexMap<K, V, S>

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fn index_mut( &mut self, range: RangeFull ) -> &mut <IndexMap<K, V, S> as Index<RangeFull>>::Output

Performs the mutable indexing (container[index]) operation. Read more
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impl<K, V, S> IndexMut<RangeInclusive<usize>> for IndexMap<K, V, S>

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fn index_mut( &mut self, range: RangeInclusive<usize> ) -> &mut <IndexMap<K, V, S> as Index<RangeInclusive<usize>>>::Output

Performs the mutable indexing (container[index]) operation. Read more
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impl<K, V, S> IndexMut<RangeTo<usize>> for IndexMap<K, V, S>

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fn index_mut( &mut self, range: RangeTo<usize> ) -> &mut <IndexMap<K, V, S> as Index<RangeTo<usize>>>::Output

Performs the mutable indexing (container[index]) operation. Read more
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impl<K, V, S> IndexMut<RangeToInclusive<usize>> for IndexMap<K, V, S>

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fn index_mut( &mut self, range: RangeToInclusive<usize> ) -> &mut <IndexMap<K, V, S> as Index<RangeToInclusive<usize>>>::Output

Performs the mutable indexing (container[index]) operation. Read more
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impl<K, V, S> IndexMut<usize> for IndexMap<K, V, S>

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!
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fn index_mut(&mut self, index: usize) -> &mut V

Returns a mutable reference to the value at the supplied index.

Panics if index is out of bounds.

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impl<'de, K, V, S, E> IntoDeserializer<'de, E> for IndexMap<K, V, S>
where K: IntoDeserializer<'de, E> + Eq + Hash, V: IntoDeserializer<'de, E>, S: BuildHasher, E: Error,

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type Deserializer = MapDeserializer<'de, <IndexMap<K, V, S> as IntoIterator>::IntoIter, E>

The type of the deserializer being converted into.
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fn into_deserializer( self ) -> <IndexMap<K, V, S> as IntoDeserializer<'de, E>>::Deserializer

Convert this value into a deserializer.
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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.
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type IntoIter = Iter<'a, K, V>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> <&'a IndexMap<K, V, S> as IntoIterator>::IntoIter

Creates an iterator from a value. Read more
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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.
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type IntoIter = IterMut<'a, K, V>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> <&'a mut IndexMap<K, V, S> as IntoIterator>::IntoIter

Creates an iterator from a value. Read more
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impl<K, V, S> IntoIterator for IndexMap<K, V, S>

§

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?
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fn into_iter(self) -> <IndexMap<K, V, S> as IntoIterator>::IntoIter

Creates an iterator from a value. Read more
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impl<K, V, S> MutableKeys for IndexMap<K, V, S>
where K: Eq + Hash, S: BuildHasher,

Opt-in mutable access to keys.

See MutableKeys for more information.

§

type Key = K

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type Value = V

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fn get_full_mut2<Q>(&mut self, key: &Q) -> Option<(usize, &mut K, &mut V)>
where Q: Hash + Equivalent<K> + ?Sized,

Return item index, mutable reference to key and value Read more
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fn get_index_mut2(&mut self, index: usize) -> Option<(&mut K, &mut V)>

Return mutable reference to key and value at an index. Read more
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fn retain2<F>(&mut self, keep: F)
where F: FnMut(&mut K, &mut V) -> bool,

Scan through each key-value pair in the map and keep those where the closure keep returns true. Read more
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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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fn eq(&self, other: &IndexMap<K, V2, S2>) -> bool

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<K, V, S> Serialize for IndexMap<K, V, S>
where K: Serialize + Hash + Eq, V: Serialize, S: BuildHasher,

Requires crate feature "serde"

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fn serialize<T>( &self, serializer: T ) -> Result<<T as Serializer>::Ok, <T as Serializer>::Error>
where T: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl<K, V, S> Eq for IndexMap<K, V, S>
where K: Eq + Hash, V: Eq, S: BuildHasher,

Auto Trait Implementations§

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impl<K, V, S> RefUnwindSafe for IndexMap<K, V, S>

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impl<K, V, S> Send for IndexMap<K, V, S>
where K: Send, S: Send, V: Send,

§

impl<K, V, S> Sync for IndexMap<K, V, S>
where K: Sync, S: Sync, V: Sync,

§

impl<K, V, S> Unpin for IndexMap<K, V, S>
where K: Unpin, S: Unpin, V: Unpin,

§

impl<K, V, S> UnwindSafe for IndexMap<K, V, S>
where K: UnwindSafe, S: UnwindSafe, V: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
§

impl<U> As for U

§

fn as_<T>(self) -> T
where T: CastFrom<U>,

Casts self to type T. The semantics of numeric casting with the as operator are followed, so <T as As>::as_::<U> can be used in the same way as T as U for numeric conversions. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> Downcast for T
where T: Any,

§

fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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impl<T> DowncastSync for T
where T: Any + Send + Sync,

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fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Send + Sync>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

§

fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
§

type Init = T

The type for initializers.
§

unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

§

type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

§

fn vzip(self) -> V

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impl<T> BasicCategorize for T

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impl<T> BasicDecode for T

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impl<T> BasicDescribe for T

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impl<T> BasicEncode for T

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impl<T> BasicSbor for T

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impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,

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impl<T> ManifestCategorize for T

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impl<T> ManifestDecode for T

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impl<T> ManifestEncode for T

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impl<T> ScryptoCategorize for T

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impl<T> ScryptoDecode for T

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impl<T> ScryptoDescribe for T

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impl<T> ScryptoEncode for T

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impl<T> ScryptoSbor for T