pub struct BTreeSet<T> { /* fields omitted */ }
A set based on a B-Tree.
See BTreeMap's documentation for a detailed discussion of this collection's performance benefits and drawbacks.
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 set. This is normally only possible through Cell, RefCell, global state, I/O, or unsafe code.
use std::collections::BTreeSet;
// Type inference lets us omit an explicit type signature (which
// would be `BTreeSet<&str>` in this example).
let mut books = BTreeSet::new();
// Add some books.
books.insert("A Dance With Dragons");
books.insert("To Kill a Mockingbird");
books.insert("The Odyssey");
books.insert("The Great Gatsby");
// Check for a specific one.
if !books.contains("The Winds of Winter") {
println!("We have {} books, but The Winds of Winter ain't one.",
books.len());
}
// Remove a book.
books.remove("The Odyssey");
// Iterate over everything.
for book in &books {
println!("{}", book);
}impl<T> BTreeSet<T> where
T: Ord, [src]
pub fn new() -> BTreeSet<T>[src]
Makes a new BTreeSet with a reasonable choice of B.
use std::collections::BTreeSet; let mut set: BTreeSet<i32> = BTreeSet::new();
pub fn range<K, R>(&self, range: R) -> Range<'_, T>ⓘNotable traits for Range<'a, T>
impl<'a, T> Iterator for Range<'a, T>
type Item = &'a T;
where
K: Ord + ?Sized,
R: RangeBounds<K>,
T: Borrow<K>, [src]1.17.0
Constructs a double-ended iterator over a sub-range of elements in the set. The simplest way is to use the range syntax min..max, thus range(min..max) will yield elements from min (inclusive) to max (exclusive). The range may also be entered as (Bound<T>, Bound<T>), so for example range((Excluded(4), Included(10))) will yield a left-exclusive, right-inclusive range from 4 to 10.
use std::collections::BTreeSet;
use std::ops::Bound::Included;
let mut set = BTreeSet::new();
set.insert(3);
set.insert(5);
set.insert(8);
for &elem in set.range((Included(&4), Included(&8))) {
println!("{}", elem);
}
assert_eq!(Some(&5), set.range(4..).next());pub fn difference(&'a self, other: &'a BTreeSet<T>) -> Difference<'a, T>ⓘNotable traits for Difference<'a, T>
impl<'a, T> Iterator for Difference<'a, T> where
T: Ord,
type Item = &'a T;
[src]
Visits the values representing the difference, i.e., the values that are in self but not in other, in ascending order.
use std::collections::BTreeSet; let mut a = BTreeSet::new(); a.insert(1); a.insert(2); let mut b = BTreeSet::new(); b.insert(2); b.insert(3); let diff: Vec<_> = a.difference(&b).cloned().collect(); assert_eq!(diff, [1]);
pub fn symmetric_difference(
&'a self,
other: &'a BTreeSet<T>
) -> SymmetricDifference<'a, T>ⓘNotable traits for SymmetricDifference<'a, T>
impl<'a, T> Iterator for SymmetricDifference<'a, T> where
T: Ord,
type Item = &'a T;
[src]
Visits the values representing the symmetric difference, i.e., the values that are in self or in other but not in both, in ascending order.
use std::collections::BTreeSet; let mut a = BTreeSet::new(); a.insert(1); a.insert(2); let mut b = BTreeSet::new(); b.insert(2); b.insert(3); let sym_diff: Vec<_> = a.symmetric_difference(&b).cloned().collect(); assert_eq!(sym_diff, [1, 3]);
pub fn intersection(&'a self, other: &'a BTreeSet<T>) -> Intersection<'a, T>ⓘNotable traits for Intersection<'a, T>
impl<'a, T> Iterator for Intersection<'a, T> where
T: Ord,
type Item = &'a T;
[src]
Visits the values representing the intersection, i.e., the values that are both in self and other, in ascending order.
use std::collections::BTreeSet; let mut a = BTreeSet::new(); a.insert(1); a.insert(2); let mut b = BTreeSet::new(); b.insert(2); b.insert(3); let intersection: Vec<_> = a.intersection(&b).cloned().collect(); assert_eq!(intersection, [2]);
pub fn union(&'a self, other: &'a BTreeSet<T>) -> Union<'a, T>ⓘNotable traits for Union<'a, T>
impl<'a, T> Iterator for Union<'a, T> where
T: Ord,
type Item = &'a T;
[src]
Visits the values representing the union, i.e., all the values in self or other, without duplicates, in ascending order.
use std::collections::BTreeSet; let mut a = BTreeSet::new(); a.insert(1); let mut b = BTreeSet::new(); b.insert(2); let union: Vec<_> = a.union(&b).cloned().collect(); assert_eq!(union, [1, 2]);
pub fn clear(&mut self)[src]
Clears the set, removing all values.
use std::collections::BTreeSet; let mut v = BTreeSet::new(); v.insert(1); v.clear(); assert!(v.is_empty());
pub fn contains<Q>(&self, value: &Q) -> bool where
Q: Ord + ?Sized,
T: Borrow<Q>, [src]
Returns true if the set contains a value.
The value may be any borrowed form of the set's value type, but the ordering on the borrowed form must match the ordering on the value type.
use std::collections::BTreeSet; let set: BTreeSet<_> = [1, 2, 3].iter().cloned().collect(); assert_eq!(set.contains(&1), true); assert_eq!(set.contains(&4), false);
pub fn get<Q>(&self, value: &Q) -> Option<&T> where
Q: Ord + ?Sized,
T: Borrow<Q>, [src]1.9.0
Returns a reference to the value in the set, if any, that is equal to the given value.
The value may be any borrowed form of the set's value type, but the ordering on the borrowed form must match the ordering on the value type.
use std::collections::BTreeSet; let set: BTreeSet<_> = [1, 2, 3].iter().cloned().collect(); assert_eq!(set.get(&2), Some(&2)); assert_eq!(set.get(&4), None);
pub fn is_disjoint(&self, other: &BTreeSet<T>) -> bool[src]
Returns true if self has no elements in common with other. This is equivalent to checking for an empty intersection.
use std::collections::BTreeSet; let a: BTreeSet<_> = [1, 2, 3].iter().cloned().collect(); let mut b = BTreeSet::new(); assert_eq!(a.is_disjoint(&b), true); b.insert(4); assert_eq!(a.is_disjoint(&b), true); b.insert(1); assert_eq!(a.is_disjoint(&b), false);
pub fn is_subset(&self, other: &BTreeSet<T>) -> bool[src]
Returns true if the set is a subset of another, i.e., other contains at least all the values in self.
use std::collections::BTreeSet; let sup: BTreeSet<_> = [1, 2, 3].iter().cloned().collect(); let mut set = BTreeSet::new(); assert_eq!(set.is_subset(&sup), true); set.insert(2); assert_eq!(set.is_subset(&sup), true); set.insert(4); assert_eq!(set.is_subset(&sup), false);
pub fn is_superset(&self, other: &BTreeSet<T>) -> bool[src]
Returns true if the set is a superset of another, i.e., self contains at least all the values in other.
use std::collections::BTreeSet; let sub: BTreeSet<_> = [1, 2].iter().cloned().collect(); let mut set = BTreeSet::new(); assert_eq!(set.is_superset(&sub), false); set.insert(0); set.insert(1); assert_eq!(set.is_superset(&sub), false); set.insert(2); assert_eq!(set.is_superset(&sub), true);
pub fn first(&self) -> Option<&T>[src]
Returns a reference to the first value in the set, if any. This value is always the minimum of all values in the set.
Basic usage:
#![feature(map_first_last)] use std::collections::BTreeSet; let mut map = BTreeSet::new(); assert_eq!(map.first(), None); map.insert(1); assert_eq!(map.first(), Some(&1)); map.insert(2); assert_eq!(map.first(), Some(&1));
pub fn last(&self) -> Option<&T>[src]
Returns a reference to the last value in the set, if any. This value is always the maximum of all values in the set.
Basic usage:
#![feature(map_first_last)] use std::collections::BTreeSet; let mut map = BTreeSet::new(); assert_eq!(map.first(), None); map.insert(1); assert_eq!(map.last(), Some(&1)); map.insert(2); assert_eq!(map.last(), Some(&2));
pub fn pop_first(&mut self) -> Option<T>[src]
Removes the first value from the set and returns it, if any. The first value is always the minimum value in the set.
#![feature(map_first_last)]
use std::collections::BTreeSet;
let mut set = BTreeSet::new();
set.insert(1);
while let Some(n) = set.pop_first() {
assert_eq!(n, 1);
}
assert!(set.is_empty());pub fn pop_last(&mut self) -> Option<T>[src]
Removes the last value from the set and returns it, if any. The last value is always the maximum value in the set.
#![feature(map_first_last)]
use std::collections::BTreeSet;
let mut set = BTreeSet::new();
set.insert(1);
while let Some(n) = set.pop_last() {
assert_eq!(n, 1);
}
assert!(set.is_empty());pub fn insert(&mut self, value: T) -> bool[src]
Adds a value to the set.
If the set did not have this value present, true is returned.
If the set did have this value present, false is returned, and the entry is not updated. See the module-level documentation for more.
use std::collections::BTreeSet; let mut set = BTreeSet::new(); assert_eq!(set.insert(2), true); assert_eq!(set.insert(2), false); assert_eq!(set.len(), 1);
pub fn replace(&mut self, value: T) -> Option<T>[src]1.9.0
Adds a value to the set, replacing the existing value, if any, that is equal to the given one. Returns the replaced value.
use std::collections::BTreeSet; let mut set = BTreeSet::new(); set.insert(Vec::<i32>::new()); assert_eq!(set.get(&[][..]).unwrap().capacity(), 0); set.replace(Vec::with_capacity(10)); assert_eq!(set.get(&[][..]).unwrap().capacity(), 10);
pub fn remove<Q>(&mut self, value: &Q) -> bool where
Q: Ord + ?Sized,
T: Borrow<Q>, [src]
Removes a value from the set. Returns whether the value was present in the set.
The value may be any borrowed form of the set's value type, but the ordering on the borrowed form must match the ordering on the value type.
use std::collections::BTreeSet; let mut set = BTreeSet::new(); set.insert(2); assert_eq!(set.remove(&2), true); assert_eq!(set.remove(&2), false);
pub fn take<Q>(&mut self, value: &Q) -> Option<T> where
Q: Ord + ?Sized,
T: Borrow<Q>, [src]1.9.0
Removes and returns the value in the set, if any, that is equal to the given one.
The value may be any borrowed form of the set's value type, but the ordering on the borrowed form must match the ordering on the value type.
use std::collections::BTreeSet; let mut set: BTreeSet<_> = [1, 2, 3].iter().cloned().collect(); assert_eq!(set.take(&2), Some(2)); assert_eq!(set.take(&2), None);
pub fn append(&mut self, other: &mut BTreeSet<T>)[src]1.11.0
Moves all elements from other into Self, leaving other empty.
use std::collections::BTreeSet; let mut a = BTreeSet::new(); a.insert(1); a.insert(2); a.insert(3); let mut b = BTreeSet::new(); b.insert(3); b.insert(4); b.insert(5); a.append(&mut b); assert_eq!(a.len(), 5); assert_eq!(b.len(), 0); assert!(a.contains(&1)); assert!(a.contains(&2)); assert!(a.contains(&3)); assert!(a.contains(&4)); assert!(a.contains(&5));
pub fn split_off<Q>(&mut self, key: &Q) -> BTreeSet<T> where
Q: Ord + ?Sized,
T: Borrow<Q>, [src]1.11.0
Splits the collection into two at the given key. Returns everything after the given key, including the key.
Basic usage:
use std::collections::BTreeSet; let mut a = BTreeSet::new(); a.insert(1); a.insert(2); a.insert(3); a.insert(17); a.insert(41); let b = a.split_off(&3); assert_eq!(a.len(), 2); assert_eq!(b.len(), 3); assert!(a.contains(&1)); assert!(a.contains(&2)); assert!(b.contains(&3)); assert!(b.contains(&17)); assert!(b.contains(&41));
pub fn drain_filter<'a, F>(&'a mut self, pred: F) -> DrainFilter<'a, T, F>ⓘNotable traits for DrainFilter<'_, T, F>
impl<'a, '_, T, F> Iterator for DrainFilter<'_, T, F> where
F: 'a + FnMut(&T) -> bool,
type Item = T;
where
F: 'a + FnMut(&T) -> bool, [src]
Creates an iterator which uses a closure to determine if a value should be removed.
If the closure returns true, then the value is removed and yielded. If the closure returns false, the value will remain in the list and will not be yielded by the iterator.
If the iterator is only partially consumed or not consumed at all, each of the remaining values will still be subjected to the closure and removed and dropped if it returns true.
It is unspecified how many more values will be subjected to the closure if a panic occurs in the closure, or if a panic occurs while dropping a value, or if the DrainFilter itself is leaked.
Splitting a set into even and odd values, reusing the original set:
#![feature(btree_drain_filter)] use std::collections::BTreeSet; let mut set: BTreeSet<i32> = (0..8).collect(); let evens: BTreeSet<_> = set.drain_filter(|v| v % 2 == 0).collect(); let odds = set; assert_eq!(evens.into_iter().collect::<Vec<_>>(), vec![0, 2, 4, 6]); assert_eq!(odds.into_iter().collect::<Vec<_>>(), vec![1, 3, 5, 7]);
impl<T> BTreeSet<T>[src]
pub fn iter(&self) -> Iter<'_, T>ⓘNotable traits for Iter<'a, T>
impl<'a, T> Iterator for Iter<'a, T>
type Item = &'a T;
[src]
Gets an iterator that visits the values in the BTreeSet in ascending order.
use std::collections::BTreeSet; let set: BTreeSet<usize> = [1, 2, 3].iter().cloned().collect(); let mut set_iter = set.iter(); assert_eq!(set_iter.next(), Some(&1)); assert_eq!(set_iter.next(), Some(&2)); assert_eq!(set_iter.next(), Some(&3)); assert_eq!(set_iter.next(), None);
Values returned by the iterator are returned in ascending order:
use std::collections::BTreeSet; let set: BTreeSet<usize> = [3, 1, 2].iter().cloned().collect(); let mut set_iter = set.iter(); assert_eq!(set_iter.next(), Some(&1)); assert_eq!(set_iter.next(), Some(&2)); assert_eq!(set_iter.next(), Some(&3)); assert_eq!(set_iter.next(), None);
pub fn len(&self) -> usize[src]
Returns the number of elements in the set.
use std::collections::BTreeSet; let mut v = BTreeSet::new(); assert_eq!(v.len(), 0); v.insert(1); assert_eq!(v.len(), 1);
pub fn is_empty(&self) -> bool[src]
Returns true if the set contains no elements.
use std::collections::BTreeSet; let mut v = BTreeSet::new(); assert!(v.is_empty()); v.insert(1); assert!(!v.is_empty());
impl<'_, '_, T> BitAnd<&'_ BTreeSet<T>> for &'_ BTreeSet<T> where
T: Clone + Ord, [src]
type Output = BTreeSet<T>The resulting type after applying the & operator.
fn bitand(self, rhs: &BTreeSet<T>) -> BTreeSet<T>[src]
Returns the intersection of self and rhs as a new BTreeSet<T>.
use std::collections::BTreeSet; let a: BTreeSet<_> = vec![1, 2, 3].into_iter().collect(); let b: BTreeSet<_> = vec![2, 3, 4].into_iter().collect(); let result = &a & &b; let result_vec: Vec<_> = result.into_iter().collect(); assert_eq!(result_vec, [2, 3]);
impl<'_, '_, T> BitOr<&'_ BTreeSet<T>> for &'_ BTreeSet<T> where
T: Clone + Ord, [src]
type Output = BTreeSet<T>The resulting type after applying the | operator.
fn bitor(self, rhs: &BTreeSet<T>) -> BTreeSet<T>[src]
Returns the union of self and rhs as a new BTreeSet<T>.
use std::collections::BTreeSet; let a: BTreeSet<_> = vec![1, 2, 3].into_iter().collect(); let b: BTreeSet<_> = vec![3, 4, 5].into_iter().collect(); let result = &a | &b; let result_vec: Vec<_> = result.into_iter().collect(); assert_eq!(result_vec, [1, 2, 3, 4, 5]);
impl<'_, '_, T> BitXor<&'_ BTreeSet<T>> for &'_ BTreeSet<T> where
T: Clone + Ord, [src]
type Output = BTreeSet<T>The resulting type after applying the ^ operator.
fn bitxor(self, rhs: &BTreeSet<T>) -> BTreeSet<T>[src]
Returns the symmetric difference of self and rhs as a new BTreeSet<T>.
use std::collections::BTreeSet; let a: BTreeSet<_> = vec![1, 2, 3].into_iter().collect(); let b: BTreeSet<_> = vec![2, 3, 4].into_iter().collect(); let result = &a ^ &b; let result_vec: Vec<_> = result.into_iter().collect(); assert_eq!(result_vec, [1, 4]);
impl<T> Clone for BTreeSet<T> where
T: Clone, [src]
impl<T> Debug for BTreeSet<T> where
T: Debug, [src]
impl<T> Default for BTreeSet<T> where
T: Ord, [src]
impl<T> Eq for BTreeSet<T> where
T: Eq, [src]
impl<'a, T> Extend<&'a T> for BTreeSet<T> where
T: 'a + Ord + Copy, [src]1.2.0
fn extend<I>(&mut self, iter: I) where
I: IntoIterator<Item = &'a T>, [src]
fn extend_one(&mut self, &'a T)[src]
fn extend_reserve(&mut self, additional: usize)[src]
impl<T> Extend<T> for BTreeSet<T> where
T: Ord, [src]
fn extend<Iter>(&mut self, iter: Iter) where
Iter: IntoIterator<Item = T>, [src]
fn extend_one(&mut self, elem: T)[src]
fn extend_reserve(&mut self, additional: usize)[src]
impl<T> FromIterator<T> for BTreeSet<T> where
T: Ord, [src]
fn from_iter<I>(iter: I) -> BTreeSet<T> where
I: IntoIterator<Item = T>, [src]
impl<T> Hash for BTreeSet<T> where
T: Hash, [src]
fn hash<__H>(&self, state: &mut __H) where
__H: Hasher, [src]
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher, [src]1.3.0
impl<'a, T> IntoIterator for &'a BTreeSet<T>[src]
type Item = &'a TThe 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>ⓘNotable traits for Iter<'a, T>
impl<'a, T> Iterator for Iter<'a, T>
type Item = &'a T;
[src]
impl<T> IntoIterator for BTreeSet<T>[src]
type Item = TThe type of the elements being iterated over.
type IntoIter = IntoIter<T>Which kind of iterator are we turning this into?
fn into_iter(self) -> IntoIter<T>ⓘNotable traits for IntoIter<T>
impl<T> Iterator for IntoIter<T>
type Item = T;
[src]
Gets an iterator for moving out the BTreeSet's contents.
use std::collections::BTreeSet; let set: BTreeSet<usize> = [1, 2, 3, 4].iter().cloned().collect(); let v: Vec<_> = set.into_iter().collect(); assert_eq!(v, [1, 2, 3, 4]);
impl<T> Ord for BTreeSet<T> where
T: Ord, [src]
fn cmp(&self, other: &BTreeSet<T>) -> Ordering[src]
fn max(self, other: Self) -> Self[src]1.21.0
fn min(self, other: Self) -> Self[src]1.21.0
fn clamp(self, min: Self, max: Self) -> Self[src]
impl<T> PartialEq<BTreeSet<T>> for BTreeSet<T> where
T: PartialEq<T>, [src]
impl<T> PartialOrd<BTreeSet<T>> for BTreeSet<T> where
T: PartialOrd<T>, [src]
fn partial_cmp(&self, other: &BTreeSet<T>) -> Option<Ordering>[src]
fn lt(&self, other: &BTreeSet<T>) -> bool[src]
fn le(&self, other: &BTreeSet<T>) -> bool[src]
fn gt(&self, other: &BTreeSet<T>) -> bool[src]
fn ge(&self, other: &BTreeSet<T>) -> bool[src]
impl<T> StructuralEq for BTreeSet<T>[src]
impl<T> StructuralPartialEq for BTreeSet<T>[src]
impl<'_, '_, T> Sub<&'_ BTreeSet<T>> for &'_ BTreeSet<T> where
T: Clone + Ord, [src]
type Output = BTreeSet<T>The resulting type after applying the - operator.
fn sub(self, rhs: &BTreeSet<T>) -> BTreeSet<T>[src]
Returns the difference of self and rhs as a new BTreeSet<T>.
use std::collections::BTreeSet; let a: BTreeSet<_> = vec![1, 2, 3].into_iter().collect(); let b: BTreeSet<_> = vec![3, 4, 5].into_iter().collect(); let result = &a - &b; let result_vec: Vec<_> = result.into_iter().collect(); assert_eq!(result_vec, [1, 2]);
impl<T> RefUnwindSafe for BTreeSet<T> where
T: RefUnwindSafe, impl<T> Send for BTreeSet<T> where
T: Send, impl<T> Sync for BTreeSet<T> where
T: Sync, impl<T> Unpin for BTreeSet<T> where
T: Unpin, impl<T> UnwindSafe for BTreeSet<T> where
T: RefUnwindSafe + UnwindSafe, impl<T> Any for T where
T: 'static + ?Sized, [src]
impl<T> Borrow<T> for T where
T: ?Sized, [src]
fn borrow(&self) -> &TⓘNotable traits for &'_ mut F
impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized,
type Output = <F as Future>::Output;
impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized,
type Item = <I as Iterator>::Item;
impl<R: Read + ?Sized, '_> Read for &'_ mut R
impl<W: Write + ?Sized, '_> Write for &'_ mut W
[src]
impl<T> BorrowMut<T> for T where
T: ?Sized, [src]
fn borrow_mut(&mut self) -> &mut TⓘNotable traits for &'_ mut F
impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized,
type Output = <F as Future>::Output;
impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized,
type Item = <I as Iterator>::Item;
impl<R: Read + ?Sized, '_> Read for &'_ mut R
impl<W: Write + ?Sized, '_> Write for &'_ mut W
[src]
impl<T> From<T> for T[src]
impl<T, U> Into<U> for T where
U: From<T>, [src]
impl<I> IntoIterator for I where
I: Iterator, [src]
type Item = <I as Iterator>::ItemThe type of the elements being iterated over.
type IntoIter = IWhich kind of iterator are we turning this into?
fn into_iter(self) -> I[src]
impl<T> ToOwned for T where
T: Clone, [src]
type Owned = TThe resulting type after obtaining ownership.
fn to_owned(&self) -> T[src]
fn clone_into(&self, target: &mut T)[src]
impl<T, U> TryFrom<U> for T where
U: Into<T>, [src]
type Error = InfallibleThe type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]
impl<T, U> TryInto<U> for T where
U: TryFrom<T>, [src]
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/collections/struct.BTreeSet.html