Struct heapless::binary_heap::BinaryHeap [−][src]
pub struct BinaryHeap<T, N, KIND> where
T: Ord,
N: ArrayLength<T>,
KIND: Kind, { /* fields omitted */ }
A priority queue implemented with a binary heap.
This can be either a min-heap or a max-heap.
It is a logic error for an item to be modified in such a way that the item's ordering relative
to any other item, as determined by the Ord
trait, changes while it is in the heap. This is
normally only possible through Cell
, RefCell
, global state, I/O, or unsafe code.
use heapless::binary_heap::{BinaryHeap, Max}; use heapless::consts::*; let mut heap: BinaryHeap<_, U8, Max> = BinaryHeap::new(); // We can use peek to look at the next item in the heap. In this case, // there's no items in there yet so we get None. assert_eq!(heap.peek(), None); // Let's add some scores... heap.push(1).unwrap(); heap.push(5).unwrap(); heap.push(2).unwrap(); // Now peek shows the most important item in the heap. assert_eq!(heap.peek(), Some(&5)); // We can check the length of a heap. assert_eq!(heap.len(), 3); // We can iterate over the items in the heap, although they are returned in // a random order. for x in &heap { println!("{}", x); } // If we instead pop these scores, they should come back in order. assert_eq!(heap.pop(), Some(5)); assert_eq!(heap.pop(), Some(2)); assert_eq!(heap.pop(), Some(1)); assert_eq!(heap.pop(), None); // We can clear the heap of any remaining items. heap.clear(); // The heap should now be empty. assert!(heap.is_empty())
Methods
impl<T, N, K> BinaryHeap<T, N, K> where
T: Ord,
N: ArrayLength<T>,
K: Kind,
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impl<T, N, K> BinaryHeap<T, N, K> where
T: Ord,
N: ArrayLength<T>,
K: Kind,
pub const fn new() -> Self
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pub const fn new() -> Self
Creates an empty BinaryHeap as a $K-heap.
use heapless::binary_heap::{BinaryHeap, Max}; use heapless::consts::*; let mut heap: BinaryHeap<_, U8, Max> = BinaryHeap::new(); heap.push(4).unwrap();
pub fn capacity(&self) -> usize
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pub fn capacity(&self) -> usize
Returns the capacity of the binary heap.
pub fn clear(&mut self)
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pub fn clear(&mut self)
Drops all items from the binary heap.
use heapless::binary_heap::{BinaryHeap, Max}; use heapless::consts::*; let mut heap: BinaryHeap<_, U8, Max> = BinaryHeap::new(); heap.push(1).unwrap(); heap.push(3).unwrap(); assert!(!heap.is_empty()); heap.clear(); assert!(heap.is_empty());
pub fn len(&self) -> usize
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pub fn len(&self) -> usize
Returns the length of the binary heap.
use heapless::binary_heap::{BinaryHeap, Max}; use heapless::consts::*; let mut heap: BinaryHeap<_, U8, Max> = BinaryHeap::new(); heap.push(1).unwrap(); heap.push(3).unwrap(); assert_eq!(heap.len(), 2);
pub fn is_empty(&self) -> bool
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pub fn is_empty(&self) -> bool
Checks if the binary heap is empty.
use heapless::binary_heap::{BinaryHeap, Max}; use heapless::consts::*; let mut heap: BinaryHeap<_, U8, Max> = BinaryHeap::new(); assert!(heap.is_empty()); heap.push(3).unwrap(); heap.push(5).unwrap(); heap.push(1).unwrap(); assert!(!heap.is_empty());
ⓘImportant traits for Iter<'a, T>pub fn iter(&self) -> Iter<T>
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pub fn iter(&self) -> Iter<T>
Returns an iterator visiting all values in the underlying vector, in arbitrary order.
use heapless::binary_heap::{BinaryHeap, Max}; use heapless::consts::*; let mut heap: BinaryHeap<_, U8, Max> = BinaryHeap::new(); heap.push(1).unwrap(); heap.push(2).unwrap(); heap.push(3).unwrap(); heap.push(4).unwrap(); // Print 1, 2, 3, 4 in arbitrary order for x in heap.iter() { println!("{}", x); }
ⓘImportant traits for IterMut<'a, T>pub fn iter_mut(&mut self) -> IterMut<T>
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pub fn iter_mut(&mut self) -> IterMut<T>
Returns a mutable iterator visiting all values in the underlying vector, in arbitrary order.
WARNING Mutating the items in the binary heap can leave the heap in an inconsistent state.
pub fn peek(&self) -> Option<&T>
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pub fn peek(&self) -> Option<&T>
Returns the top (greatest if max-heap, smallest if min-heap) item in the binary heap, or None if it is empty.
use heapless::binary_heap::{BinaryHeap, Max}; use heapless::consts::*; let mut heap: BinaryHeap<_, U8, Max> = BinaryHeap::new(); assert_eq!(heap.peek(), None); heap.push(1).unwrap(); heap.push(5).unwrap(); heap.push(2).unwrap(); assert_eq!(heap.peek(), Some(&5));
pub fn pop(&mut self) -> Option<T>
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pub fn pop(&mut self) -> Option<T>
Removes the top (greatest if max-heap, smallest if min-heap) item from the binary heap and returns it, or None if it is empty.
use heapless::binary_heap::{BinaryHeap, Max}; use heapless::consts::*; let mut heap: BinaryHeap<_, U8, Max> = BinaryHeap::new(); heap.push(1).unwrap(); heap.push(3).unwrap(); assert_eq!(heap.pop(), Some(3)); assert_eq!(heap.pop(), Some(1)); assert_eq!(heap.pop(), None);
pub unsafe fn pop_unchecked(&mut self) -> T
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pub unsafe fn pop_unchecked(&mut self) -> T
Removes the top (greatest if max-heap, smallest if min-heap) item from the binary heap and returns it, without checking if the binary heap is empty.
pub fn push(&mut self, item: T) -> Result<(), T>
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pub fn push(&mut self, item: T) -> Result<(), T>
Pushes an item onto the binary heap.
use heapless::binary_heap::{BinaryHeap, Max}; use heapless::consts::*; let mut heap: BinaryHeap<_, U8, Max> = BinaryHeap::new(); heap.push(3).unwrap(); heap.push(5).unwrap(); heap.push(1).unwrap(); assert_eq!(heap.len(), 3); assert_eq!(heap.peek(), Some(&5));
pub unsafe fn push_unchecked(&mut self, item: T)
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pub unsafe fn push_unchecked(&mut self, item: T)
Pushes an item onto the binary heap without first checking if it's full.
Trait Implementations
impl<'a, T, N, K> IntoIterator for &'a BinaryHeap<T, N, K> where
N: ArrayLength<T>,
K: Kind,
T: Ord,
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impl<'a, T, N, K> IntoIterator for &'a BinaryHeap<T, N, K> where
N: ArrayLength<T>,
K: Kind,
T: Ord,
Auto Trait Implementations
impl<T, N, KIND> Send for BinaryHeap<T, N, KIND> where
KIND: Send,
T: Send,
impl<T, N, KIND> Send for BinaryHeap<T, N, KIND> where
KIND: Send,
T: Send,
impl<T, N, KIND> Sync for BinaryHeap<T, N, KIND> where
KIND: Sync,
T: Sync,
impl<T, N, KIND> Sync for BinaryHeap<T, N, KIND> where
KIND: Sync,
T: Sync,