Struct no_std_compat2::collections::LinkedList

pub struct LinkedList<T, A = Global>where
    A: Allocator,{ /* private fields */ }

Available on non-crate feature std only.

A doubly-linked list with owned nodes.

The LinkedList allows pushing and popping elements at either end in constant time.

A LinkedList with a known list of items can be initialized from an array:

use std::collections::LinkedList;

let list = LinkedList::from([1, 2, 3]);

NOTE: It is almost always better to use Vec or VecDeque because array-based containers are generally faster, more memory efficient, and make better use of CPU cache.

Implementations

impl<T> LinkedList<T, Global>

pub const fn new() -> LinkedList<T, Global>

Available on non-no_global_oom_handling only.

Creates an empty LinkedList.

Examples

use std::collections::LinkedList;

let list: LinkedList<u32> = LinkedList::new();

pub fn append(&mut self, other: &mut LinkedList<T, Global>)

Available on non-no_global_oom_handling only.

Moves all elements from other to the end of the list.

This reuses all the nodes from other and moves them into self. After this operation, other becomes empty.

This operation should compute in O(1) time and O(1) memory.

Examples

use std::collections::LinkedList;

let mut list1 = LinkedList::new();
list1.push_back('a');

let mut list2 = LinkedList::new();
list2.push_back('b');
list2.push_back('c');

list1.append(&mut list2);

let mut iter = list1.iter();
assert_eq!(iter.next(), Some(&'a'));
assert_eq!(iter.next(), Some(&'b'));
assert_eq!(iter.next(), Some(&'c'));
assert!(iter.next().is_none());

assert!(list2.is_empty());

impl<T, A> LinkedList<T, A>where A: Allocator,

pub const fn new_in(alloc: A) -> LinkedList<T, A>

🔬This is a nightly-only experimental API. (allocator_api)

Available on non-no_global_oom_handling only.

Constructs an empty LinkedList<T, A>.

Examples

#![feature(allocator_api)]

use std::alloc::System;
use std::collections::LinkedList;

let list: LinkedList<u32, _> = LinkedList::new_in(System);

pub fn iter(&self) -> Iter<'_, T>

Available on non-no_global_oom_handling only.

Provides a forward iterator.

Examples

use std::collections::LinkedList;

let mut list: LinkedList<u32> = LinkedList::new();

list.push_back(0);
list.push_back(1);
list.push_back(2);

let mut iter = list.iter();
assert_eq!(iter.next(), Some(&0));
assert_eq!(iter.next(), Some(&1));
assert_eq!(iter.next(), Some(&2));
assert_eq!(iter.next(), None);

pub fn iter_mut(&mut self) -> IterMut<'_, T>

Available on non-no_global_oom_handling only.

Provides a forward iterator with mutable references.

Examples

use std::collections::LinkedList;

let mut list: LinkedList<u32> = LinkedList::new();

list.push_back(0);
list.push_back(1);
list.push_back(2);

for element in list.iter_mut() {
    *element += 10;
}

let mut iter = list.iter();
assert_eq!(iter.next(), Some(&10));
assert_eq!(iter.next(), Some(&11));
assert_eq!(iter.next(), Some(&12));
assert_eq!(iter.next(), None);

pub fn cursor_front(&self) -> Cursor<'_, T, A>

🔬This is a nightly-only experimental API. (linked_list_cursors)

Available on non-no_global_oom_handling only.

Provides a cursor at the front element.

The cursor is pointing to the “ghost” non-element if the list is empty.

pub fn cursor_front_mut(&mut self) -> CursorMut<'_, T, A>

🔬This is a nightly-only experimental API. (linked_list_cursors)

Available on non-no_global_oom_handling only.

Provides a cursor with editing operations at the front element.

The cursor is pointing to the “ghost” non-element if the list is empty.

pub fn cursor_back(&self) -> Cursor<'_, T, A>

🔬This is a nightly-only experimental API. (linked_list_cursors)

Available on non-no_global_oom_handling only.

Provides a cursor at the back element.

The cursor is pointing to the “ghost” non-element if the list is empty.

pub fn cursor_back_mut(&mut self) -> CursorMut<'_, T, A>

🔬This is a nightly-only experimental API. (linked_list_cursors)

Available on non-no_global_oom_handling only.

Provides a cursor with editing operations at the back element.

The cursor is pointing to the “ghost” non-element if the list is empty.

pub fn is_empty(&self) -> bool

Available on non-no_global_oom_handling only.

Returns true if the LinkedList is empty.

This operation should compute in O(1) time.

Examples

use std::collections::LinkedList;

let mut dl = LinkedList::new();
assert!(dl.is_empty());

dl.push_front("foo");
assert!(!dl.is_empty());

pub fn len(&self) -> usize

Available on non-no_global_oom_handling only.

Returns the length of the LinkedList.

This operation should compute in O(1) time.

Examples

use std::collections::LinkedList;

let mut dl = LinkedList::new();

dl.push_front(2);
assert_eq!(dl.len(), 1);

dl.push_front(1);
assert_eq!(dl.len(), 2);

dl.push_back(3);
assert_eq!(dl.len(), 3);

pub fn clear(&mut self)

Available on non-no_global_oom_handling only.

Removes all elements from the LinkedList.

This operation should compute in O(n) time.

Examples

use std::collections::LinkedList;

let mut dl = LinkedList::new();

dl.push_front(2);
dl.push_front(1);
assert_eq!(dl.len(), 2);
assert_eq!(dl.front(), Some(&1));

dl.clear();
assert_eq!(dl.len(), 0);
assert_eq!(dl.front(), None);

pub fn contains(&self, x: &T) -> boolwhere T: PartialEq<T>,

Available on non-no_global_oom_handling only.

Returns true if the LinkedList contains an element equal to the given value.

This operation should compute linearly in O(n) time.

Examples

use std::collections::LinkedList;

let mut list: LinkedList<u32> = LinkedList::new();

list.push_back(0);
list.push_back(1);
list.push_back(2);

assert_eq!(list.contains(&0), true);
assert_eq!(list.contains(&10), false);

pub fn front(&self) -> Option<&T>

Available on non-no_global_oom_handling only.

Provides a reference to the front element, or None if the list is empty.

This operation should compute in O(1) time.

Examples

use std::collections::LinkedList;

let mut dl = LinkedList::new();
assert_eq!(dl.front(), None);

dl.push_front(1);
assert_eq!(dl.front(), Some(&1));

pub fn front_mut(&mut self) -> Option<&mut T>

Available on non-no_global_oom_handling only.

Provides a mutable reference to the front element, or None if the list is empty.

This operation should compute in O(1) time.

Examples

use std::collections::LinkedList;

let mut dl = LinkedList::new();
assert_eq!(dl.front(), None);

dl.push_front(1);
assert_eq!(dl.front(), Some(&1));

match dl.front_mut() {
    None => {},
    Some(x) => *x = 5,
}
assert_eq!(dl.front(), Some(&5));

pub fn back(&self) -> Option<&T>

Available on non-no_global_oom_handling only.

Provides a reference to the back element, or None if the list is empty.

This operation should compute in O(1) time.

Examples

use std::collections::LinkedList;

let mut dl = LinkedList::new();
assert_eq!(dl.back(), None);

dl.push_back(1);
assert_eq!(dl.back(), Some(&1));

pub fn back_mut(&mut self) -> Option<&mut T>

Available on non-no_global_oom_handling only.

Provides a mutable reference to the back element, or None if the list is empty.

This operation should compute in O(1) time.

Examples

use std::collections::LinkedList;

let mut dl = LinkedList::new();
assert_eq!(dl.back(), None);

dl.push_back(1);
assert_eq!(dl.back(), Some(&1));

match dl.back_mut() {
    None => {},
    Some(x) => *x = 5,
}
assert_eq!(dl.back(), Some(&5));

pub fn push_front(&mut self, elt: T)

Available on non-no_global_oom_handling only.

Adds an element first in the list.

This operation should compute in O(1) time.

Examples

use std::collections::LinkedList;

let mut dl = LinkedList::new();

dl.push_front(2);
assert_eq!(dl.front().unwrap(), &2);

dl.push_front(1);
assert_eq!(dl.front().unwrap(), &1);

pub fn pop_front(&mut self) -> Option<T>

Available on non-no_global_oom_handling only.

Removes the first element and returns it, or None if the list is empty.

This operation should compute in O(1) time.

Examples

use std::collections::LinkedList;

let mut d = LinkedList::new();
assert_eq!(d.pop_front(), None);

d.push_front(1);
d.push_front(3);
assert_eq!(d.pop_front(), Some(3));
assert_eq!(d.pop_front(), Some(1));
assert_eq!(d.pop_front(), None);

pub fn push_back(&mut self, elt: T)

Available on non-no_global_oom_handling only.

Appends an element to the back of a list.

This operation should compute in O(1) time.

Examples

use std::collections::LinkedList;

let mut d = LinkedList::new();
d.push_back(1);
d.push_back(3);
assert_eq!(3, *d.back().unwrap());

pub fn pop_back(&mut self) -> Option<T>

Available on non-no_global_oom_handling only.

Removes the last element from a list and returns it, or None if it is empty.

This operation should compute in O(1) time.

Examples

use std::collections::LinkedList;

let mut d = LinkedList::new();
assert_eq!(d.pop_back(), None);
d.push_back(1);
d.push_back(3);
assert_eq!(d.pop_back(), Some(3));

pub fn split_off(&mut self, at: usize) -> LinkedList<T, A>where A: Clone,

Available on non-no_global_oom_handling only.

Splits the list into two at the given index. Returns everything after the given index, including the index.

This operation should compute in O(n) time.

Panics

Panics if at > len.

Examples

use std::collections::LinkedList;

let mut d = LinkedList::new();

d.push_front(1);
d.push_front(2);
d.push_front(3);

let mut split = d.split_off(2);

assert_eq!(split.pop_front(), Some(1));
assert_eq!(split.pop_front(), None);

pub fn remove(&mut self, at: usize) -> T

🔬This is a nightly-only experimental API. (linked_list_remove)

Available on non-no_global_oom_handling only.

Removes the element at the given index and returns it.

This operation should compute in O(n) time.

Panics

Panics if at >= len

Examples

#![feature(linked_list_remove)]
use std::collections::LinkedList;

let mut d = LinkedList::new();

d.push_front(1);
d.push_front(2);
d.push_front(3);

assert_eq!(d.remove(1), 2);
assert_eq!(d.remove(0), 3);
assert_eq!(d.remove(0), 1);

pub fn drain_filter<F>(&mut self, filter: F) -> DrainFilter<'_, T, F, A> where F: FnMut(&mut T) -> bool,

🔬This is a nightly-only experimental API. (drain_filter)

Available on non-no_global_oom_handling only.

Creates an iterator which uses a closure to determine if an element should be removed.

If the closure returns true, then the element is removed and yielded. If the closure returns false, the element will remain in the list and will not be yielded by the iterator.

Note that drain_filter lets you mutate every element in the filter closure, regardless of whether you choose to keep or remove it.

Examples

Splitting a list into evens and odds, reusing the original list:

#![feature(drain_filter)]
use std::collections::LinkedList;

let mut numbers: LinkedList<u32> = LinkedList::new();
numbers.extend(&[1, 2, 3, 4, 5, 6, 8, 9, 11, 13, 14, 15]);

let evens = numbers.drain_filter(|x| *x % 2 == 0).collect::<LinkedList<_>>();
let odds = numbers;

assert_eq!(evens.into_iter().collect::<Vec<_>>(), vec![2, 4, 6, 8, 14]);
assert_eq!(odds.into_iter().collect::<Vec<_>>(), vec![1, 3, 5, 9, 11, 13, 15]);

Trait Implementations

impl<T, A> Clone for LinkedList<T, A>where T: Clone, A: Allocator + Clone,

fn clone(&self) -> LinkedList<T, A>

Returns a copy of the value.

fn clone_from(&mut self, other: &LinkedList<T, A>)

Performs copy-assignment from source.

impl<T, A> Debug for LinkedList<T, A>where T: Debug, A: Allocator,

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

Formats the value using the given formatter.

impl<T> Default for LinkedList<T, Global>

fn default() -> LinkedList<T, Global>

Creates an empty LinkedList<T>.

impl<T, A> Drop for LinkedList<T, A>where A: Allocator,

fn drop(&mut self)

Executes the destructor for this type.

impl<'a, T, A> Extend<&'a T> for LinkedList<T, A>where T: 'a + Copy, A: Allocator,

fn extend<I>(&mut self, iter: I)where I: IntoIterator<Item = &'a T>,

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, _: &'a T)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

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.

impl<T, A> Extend<T> for LinkedList<T, A>where A: Allocator,

fn extend<I>(&mut self, iter: I)where I: IntoIterator<Item = T>,

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, elem: T)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

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.

impl<T, const N: usize> From<[T; N]> for LinkedList<T, Global>

fn from(arr: [T; N]) -> LinkedList<T, Global>

Converts a [T; N] into a LinkedList<T>.

use std::collections::LinkedList;

let list1 = LinkedList::from([1, 2, 3, 4]);
let list2: LinkedList<_> = [1, 2, 3, 4].into();
assert_eq!(list1, list2);

impl<T> FromIterator<T> for LinkedList<T, Global>

fn from_iter<I>(iter: I) -> LinkedList<T, Global>where I: IntoIterator<Item = T>,

Creates a value from an iterator.

impl<T, A> Hash for LinkedList<T, A>where T: Hash, A: Allocator,

fn hash<H>(&self, state: &mut H)where H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'a, T, A> IntoIterator for &'a LinkedList<T, A>where A: Allocator,

type Item = &'a T

The type of the elements being iterated over.

type IntoIter = Iter<'a, T>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Iter<'a, T>

Creates an iterator from a value.

impl<'a, T, A> IntoIterator for &'a mut LinkedList<T, A>where A: Allocator,

type Item = &'a mut T

The type of the elements being iterated over.

type IntoIter = IterMut<'a, T>

Which kind of iterator are we turning this into?

fn into_iter(self) -> IterMut<'a, T>

Creates an iterator from a value.

impl<T, A> IntoIterator for LinkedList<T, A>where A: Allocator,

fn into_iter(self) -> IntoIter<T, A>

Consumes the list into an iterator yielding elements by value.

type Item = T

The type of the elements being iterated over.

type IntoIter = IntoIter<T, A>

Which kind of iterator are we turning this into?

impl<T, A> Ord for LinkedList<T, A>where T: Ord, A: Allocator,

fn cmp(&self, other: &LinkedList<T, A>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval.

impl<T, A> PartialEq<LinkedList<T, A>> for LinkedList<T, A>where T: PartialEq<T>, A: Allocator,

fn eq(&self, other: &LinkedList<T, A>) -> bool

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

fn ne(&self, other: &LinkedList<T, A>) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T, A> PartialOrd<LinkedList<T, A>> for LinkedList<T, A>where T: PartialOrd<T>, A: Allocator,

fn partial_cmp(&self, other: &LinkedList<T, A>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

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

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

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

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

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

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

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

impl<T, A> Eq for LinkedList<T, A>where T: Eq, A: Allocator,

impl<T, A> Send for LinkedList<T, A>where T: Send, A: Allocator + Send,

impl<T, A> Sync for LinkedList<T, A>where T: Sync, A: Allocator + Sync,