1.0.0[][src]Struct std::collections::linked_list::LinkedList

pub struct LinkedList<T> { /* fields omitted */ }

A doubly-linked list with owned nodes.

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

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.

Methods

impl<T> LinkedList<T>[src]

pub const fn new() -> LinkedList<T>[src]

Creates an empty LinkedList.

Examples

use std::collections::LinkedList;

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

pub fn append(&mut self, other: &mut LinkedList<T>)[src]

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());Run

Important traits for Iter<'a, T>
pub fn iter(&self) -> Iter<T>[src]

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);Run

Important traits for IterMut<'a, T>
pub fn iter_mut(&mut self) -> IterMut<T>[src]

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);Run

pub fn is_empty(&self) -> bool[src]

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());Run

pub fn len(&self) -> usize[src]

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);Run

pub fn clear(&mut self)[src]

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);Run

pub fn contains(&self, x: &T) -> bool where
    T: PartialEq<T>, 
1.12.0[src]

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

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);Run

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

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

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));Run

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

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

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));Run

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

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

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));Run

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

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

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));Run

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

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);Run

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

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);Run

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

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());Run

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

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));Run

pub fn split_off(&mut self, at: usize) -> LinkedList<T>[src]

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 splitted = d.split_off(2);

assert_eq!(splitted.pop_front(), Some(1));
assert_eq!(splitted.pop_front(), None);Run

Important traits for DrainFilter<'_, T, F>
pub fn drain_filter<F>(&mut self, filter: F) -> DrainFilter<T, F> where
    F: FnMut(&mut T) -> bool
[src]

🔬 This is a nightly-only experimental API. (drain_filter #43244)

recently added

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]);Run

Trait Implementations

impl<T> Clone for LinkedList<T> where
    T: Clone
[src]

impl<T> Ord for LinkedList<T> where
    T: Ord
[src]

impl<T> Send for LinkedList<T> where
    T: Send
[src]

impl<T> Eq for LinkedList<T> where
    T: Eq
[src]

impl<T> Sync for LinkedList<T> where
    T: Sync
[src]

impl<T> IntoIterator for LinkedList<T>[src]

type Item = T

The type of the elements being iterated over.

type IntoIter = IntoIter<T>

Which kind of iterator are we turning this into?

Important traits for IntoIter<T>
fn into_iter(self) -> IntoIter<T>[src]

Consumes the list into an iterator yielding elements by value.

impl<'a, T> IntoIterator for &'a LinkedList<T>[src]

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?

impl<'a, T> IntoIterator for &'a mut LinkedList<T>[src]

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?

impl<T> PartialEq<LinkedList<T>> for LinkedList<T> where
    T: PartialEq<T>, 
[src]

impl<T> FromIterator<T> for LinkedList<T>[src]

impl<T> Hash for LinkedList<T> where
    T: Hash
[src]

impl<T> Drop for LinkedList<T>[src]

impl<T> Default for LinkedList<T>[src]

fn default() -> LinkedList<T>[src]

Creates an empty LinkedList<T>.

impl<T> PartialOrd<LinkedList<T>> for LinkedList<T> where
    T: PartialOrd<T>, 
[src]

impl<T> Debug for LinkedList<T> where
    T: Debug
[src]

impl<'a, T> Extend<&'a T> for LinkedList<T> where
    T: 'a + Copy
1.2.0[src]

impl<T> Extend<T> for LinkedList<T>[src]

Auto Trait Implementations

impl<T> UnwindSafe for LinkedList<T> where
    T: RefUnwindSafe + UnwindSafe

impl<T> RefUnwindSafe for LinkedList<T> where
    T: RefUnwindSafe

impl<T> Unpin for LinkedList<T>

Blanket Implementations

impl<T> From<T> for T[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = !

The type returned in the event of a conversion error.

impl<I> IntoIterator for I where
    I: Iterator
[src]

type Item = <I as Iterator>::Item

The type of the elements being iterated over.

type IntoIter = I

Which kind of iterator are we turning this into?

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

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

The type returned in the event of a conversion error.

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

The resulting type after obtaining ownership.