# Struct alloc::collections::btree_set::BTreeSet

1.0.0 · source · [−]

    pub struct BTreeSet<T> { /* private fields */ }

Expand description

An ordered 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. The behavior resulting from such a logic error is not specified (it could include panics, incorrect results, aborts, memory leaks, or non-termination) but will not be undefined behavior.

Iterators returned by `BTreeSet::iter` produce their items in order, and take worst-case logarithmic and amortized constant time per item returned.

## Examples

    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}");
    }

Run

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

    use std::collections::BTreeSet;

    let set = BTreeSet::from([1, 2, 3]);

Run

## Implementations

source

### impl<T> BTreeSet<T>

const: unstable · source

#### pub fn new() -> BTreeSet<T>

Makes a new, empty `BTreeSet`.

Does not allocate anything on its own.

##### Examples

    use std::collections::BTreeSet;

    let mut set: BTreeSet<i32> = BTreeSet::new();

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1.17.0 · source

#### pub fn range<K: ?Sized, 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,
T: Borrow<K> + Ord,
R: RangeBounds<K>,

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.

##### Examples

    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());

Run
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#### pub fn difference<'a>(&'a self, other: &'a BTreeSet<T>) -> Difference<'a, T>ⓘNotable traits for Difference<'a, T>`impl<'a, T: Ord> Iterator for Difference<'a, T> type Item = &'a T;` where
T: Ord,

Visits the elements representing the difference, i.e., the elements that are in `self` but not in `other`, in ascending order.

##### Examples

    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]);

Run
source

#### pub fn symmetric_difference<'a>(
&'a self,
other: &'a BTreeSet<T>
) -> SymmetricDifference<'a, T>ⓘNotable traits for SymmetricDifference<'a, T>`impl<'a, T: Ord> Iterator for SymmetricDifference<'a, T> type Item = &'a T;` where
T: Ord,

Visits the elements representing the symmetric difference, i.e., the elements that are in `self` or in `other` but not in both, in ascending order.

##### Examples

    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]);

Run
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#### pub fn intersection<'a>(&'a self, other: &'a BTreeSet<T>) -> Intersection<'a, T>ⓘNotable traits for Intersection<'a, T>`impl<'a, T: Ord> Iterator for Intersection<'a, T> type Item = &'a T;` where
T: Ord,

Visits the elements representing the intersection, i.e., the elements that are both in `self` and `other`, in ascending order.

##### Examples

    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]);

Run
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#### pub fn union<'a>(&'a self, other: &'a BTreeSet<T>) -> Union<'a, T>ⓘNotable traits for Union<'a, T>`impl<'a, T: Ord> Iterator for Union<'a, T> type Item = &'a T;` where
T: Ord,

Visits the elements representing the union, i.e., all the elements in `self` or `other`, without duplicates, in ascending order.

##### Examples

    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]);

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#### pub fn clear(&mut self)

Clears the set, removing all elements.

##### Examples

    use std::collections::BTreeSet;

    let mut v = BTreeSet::new();
    v.insert(1);
    v.clear();
    assert!(v.is_empty());

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#### pub fn contains<Q: ?Sized>(&self, value: &Q) -> bool where
T: Borrow<Q> + Ord,
Q: Ord,

Returns `true` if the set contains an element equal to the value.

The value may be any borrowed form of the set’s element type, but the ordering on the borrowed form must match the ordering on the element type.

##### Examples

    use std::collections::BTreeSet;

    let set = BTreeSet::from([1, 2, 3]);
    assert_eq!(set.contains(&1), true);
    assert_eq!(set.contains(&4), false);

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1.9.0 · source

#### pub fn get<Q: ?Sized>(&self, value: &Q) -> Option<&T> where
T: Borrow<Q> + Ord,
Q: Ord,

Returns a reference to the element in the set, if any, that is equal to the value.

The value may be any borrowed form of the set’s element type, but the ordering on the borrowed form must match the ordering on the element type.

##### Examples

    use std::collections::BTreeSet;

    let set = BTreeSet::from([1, 2, 3]);
    assert_eq!(set.get(&2), Some(&2));
    assert_eq!(set.get(&4), None);

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#### pub fn is_disjoint(&self, other: &BTreeSet<T>) -> bool where
T: Ord,

Returns `true` if `self` has no elements in common with `other`. This is equivalent to checking for an empty intersection.

##### Examples

    use std::collections::BTreeSet;

    let a = BTreeSet::from([1, 2, 3]);
    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);

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#### pub fn is_subset(&self, other: &BTreeSet<T>) -> bool where
T: Ord,

Returns `true` if the set is a subset of another, i.e., `other` contains at least all the elements in `self`.

##### Examples

    use std::collections::BTreeSet;

    let sup = BTreeSet::from([1, 2, 3]);
    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);

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#### pub fn is_superset(&self, other: &BTreeSet<T>) -> bool where
T: Ord,

Returns `true` if the set is a superset of another, i.e., `self` contains at least all the elements in `other`.

##### Examples

    use std::collections::BTreeSet;

    let sub = BTreeSet::from([1, 2]);
    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);

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#### pub fn first(&self) -> Option<&T> where
T: Ord,

🔬 This is a nightly-only experimental API. (`map_first_last` #62924)

Returns a reference to the first element in the set, if any. This element is always the minimum of all elements in the set.

##### Examples

Basic usage:

    #![feature(map_first_last)]
    use std::collections::BTreeSet;

    let mut set = BTreeSet::new();
    assert_eq!(set.first(), None);
    set.insert(1);
    assert_eq!(set.first(), Some(&1));
    set.insert(2);
    assert_eq!(set.first(), Some(&1));

Run
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#### pub fn last(&self) -> Option<&T> where
T: Ord,

🔬 This is a nightly-only experimental API. (`map_first_last` #62924)

Returns a reference to the last element in the set, if any. This element is always the maximum of all elements in the set.

##### Examples

Basic usage:

    #![feature(map_first_last)]
    use std::collections::BTreeSet;

    let mut set = BTreeSet::new();
    assert_eq!(set.last(), None);
    set.insert(1);
    assert_eq!(set.last(), Some(&1));
    set.insert(2);
    assert_eq!(set.last(), Some(&2));

Run
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#### pub fn pop_first(&mut self) -> Option<T> where
T: Ord,

🔬 This is a nightly-only experimental API. (`map_first_last` #62924)

Removes the first element from the set and returns it, if any. The first element is always the minimum element in the set.

##### Examples

    #![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());

Run
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#### pub fn pop_last(&mut self) -> Option<T> where
T: Ord,

🔬 This is a nightly-only experimental API. (`map_first_last` #62924)

Removes the last element from the set and returns it, if any. The last element is always the maximum element in the set.

##### Examples

    #![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());

Run
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#### pub fn insert(&mut self, value: T) -> bool where
T: Ord,

Adds a value to the set.

If the set did not have an equal element present, `true` is returned.

If the set did have an equal element present, `false` is returned, and the entry is not updated. See the module-level documentation for more.

##### Examples

    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);

Run
1.9.0 · source

#### pub fn replace(&mut self, value: T) -> Option<T> where
T: Ord,

Adds a value to the set, replacing the existing element, if any, that is equal to the value. Returns the replaced element.

##### Examples

    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);

Run
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#### pub fn remove<Q: ?Sized>(&mut self, value: &Q) -> bool where
T: Borrow<Q> + Ord,
Q: Ord,

If the set contains an element equal to the value, removes it from the set and drops it. Returns whether such an element was present.

The value may be any borrowed form of the set’s element type, but the ordering on the borrowed form must match the ordering on the element type.

##### Examples

    use std::collections::BTreeSet;

    let mut set = BTreeSet::new();

    set.insert(2);
    assert_eq!(set.remove(&2), true);
    assert_eq!(set.remove(&2), false);

Run
1.9.0 · source

#### pub fn take<Q: ?Sized>(&mut self, value: &Q) -> Option<T> where
T: Borrow<Q> + Ord,
Q: Ord,

Removes and returns the element in the set, if any, that is equal to the value.

The value may be any borrowed form of the set’s element type, but the ordering on the borrowed form must match the ordering on the element type.

##### Examples

    use std::collections::BTreeSet;

    let mut set = BTreeSet::from([1, 2, 3]);
    assert_eq!(set.take(&2), Some(2));
    assert_eq!(set.take(&2), None);

Run
1.53.0 · source

#### pub fn retain<F>(&mut self, f: F) where
T: Ord,
F: FnMut(&T) -> bool,

Retains only the elements specified by the predicate.

In other words, remove all elements `e` for which `f(&e)` returns `false`. The elements are visited in ascending order.

##### Examples

    use std::collections::BTreeSet;

    let mut set = BTreeSet::from([1, 2, 3, 4, 5, 6]);
    // Keep only the even numbers.
    set.retain(|&k| k % 2 == 0);
    assert!(set.iter().eq([2, 4, 6].iter()));

Run
1.11.0 · source

#### pub fn append(&mut self, other: &mut Self) where
T: Ord,

Moves all elements from `other` into `self`, leaving `other` empty.

##### Examples

    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));

Run
1.11.0 · source

#### pub fn split_off<Q: ?Sized + Ord>(&mut self, value: &Q) -> Self where
T: Borrow<Q> + Ord,

Splits the collection into two at the value. Returns a new collection with all elements greater than or equal to the value.

##### Examples

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));

Run
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#### 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
T: Ord,
F: 'a + FnMut(&T) -> bool,

🔬 This is a nightly-only experimental API. (`btree_drain_filter` #70530)

Creates an iterator that visits all elements in ascending order and uses a closure to determine if an element should be removed.

If the closure returns `true`, the element is removed from the set and yielded. If the closure returns `false`, or panics, the element remains in the set and will not be yielded.

If the iterator is only partially consumed or not consumed at all, each of the remaining elements is still subjected to the closure and removed and dropped if it returns `true`.

It is unspecified how many more elements will be subjected to the closure if a panic occurs in the closure, or if a panic occurs while dropping an element, or if the `DrainFilter` itself is leaked.

##### Examples

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]);

Run
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#### pub fn iter(&self) -> Iter<'_, T>ⓘNotable traits for Iter<'a, T>`impl<'a, T> Iterator for Iter<'a, T> type Item = &'a T;`

Gets an iterator that visits the elements in the `BTreeSet` in ascending order.

##### Examples

    use std::collections::BTreeSet;

    let set = BTreeSet::from([1, 2, 3]);
    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);

Run

Values returned by the iterator are returned in ascending order:

    use std::collections::BTreeSet;

    let set = BTreeSet::from([3, 1, 2]);
    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);

Run
const: unstable · source

#### pub fn len(&self) -> usize

Returns the number of elements in the set.

##### Examples

    use std::collections::BTreeSet;

    let mut v = BTreeSet::new();
    assert_eq!(v.len(), 0);
    v.insert(1);
    assert_eq!(v.len(), 1);

Run
const: unstable · source

#### pub fn is_empty(&self) -> bool

Returns `true` if the set contains no elements.

##### Examples

    use std::collections::BTreeSet;

    let mut v = BTreeSet::new();
    assert!(v.is_empty());
    v.insert(1);
    assert!(!v.is_empty());

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## Trait Implementations

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### impl<T: Ord + Clone> BitAnd<&'_ BTreeSet<T>> for &BTreeSet<T>

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#### fn bitand(self, rhs: &BTreeSet<T>) -> BTreeSet<T>

Returns the intersection of `self` and `rhs` as a new `BTreeSet<T>`.

##### Examples

    use std::collections::BTreeSet;

    let a = BTreeSet::from([1, 2, 3]);
    let b = BTreeSet::from([2, 3, 4]);

    let result = &a & &b;
    let result_vec: Vec<_> = result.into_iter().collect();
    assert_eq!(result_vec, [2, 3]);

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#### type Output = BTreeSet<T>

The resulting type after applying the `&` operator.

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### impl<T: Ord + Clone> BitOr<&'_ BTreeSet<T>> for &BTreeSet<T>

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#### fn bitor(self, rhs: &BTreeSet<T>) -> BTreeSet<T>

Returns the union of `self` and `rhs` as a new `BTreeSet<T>`.

##### Examples

    use std::collections::BTreeSet;

    let a = BTreeSet::from([1, 2, 3]);
    let b = BTreeSet::from([3, 4, 5]);

    let result = &a | &b;
    let result_vec: Vec<_> = result.into_iter().collect();
    assert_eq!(result_vec, [1, 2, 3, 4, 5]);

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#### type Output = BTreeSet<T>

The resulting type after applying the `|` operator.

source

### impl<T: Ord + Clone> BitXor<&'_ BTreeSet<T>> for &BTreeSet<T>

source

#### fn bitxor(self, rhs: &BTreeSet<T>) -> BTreeSet<T>

Returns the symmetric difference of `self` and `rhs` as a new `BTreeSet<T>`.

##### Examples

    use std::collections::BTreeSet;

    let a = BTreeSet::from([1, 2, 3]);
    let b = BTreeSet::from([2, 3, 4]);

    let result = &a ^ &b;
    let result_vec: Vec<_> = result.into_iter().collect();
    assert_eq!(result_vec, [1, 4]);

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#### type Output = BTreeSet<T>

The resulting type after applying the `^` operator.

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### impl<T: Clone> Clone for BTreeSet<T>

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#### fn clone(&self) -> Self

Returns a copy of the value. Read more

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#### fn clone_from(&mut self, other: &Self)

Performs copy-assignment from `source`. Read more

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### impl<T: Debug> Debug for BTreeSet<T>

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

Formats the value using the given formatter. Read more

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### impl<T> Default for BTreeSet<T>

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#### fn default() -> BTreeSet<T>

Creates an empty `BTreeSet`.

1.2.0 · source

### impl<'a, T: 'a + Ord + Copy> Extend<&'a T> for BTreeSet<T>

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

Extends a collection with the contents of an iterator. Read more

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

🔬 This is a nightly-only experimental API. (`extend_one` #72631)

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` #72631)

Reserves capacity in a collection for the given number of additional elements. Read more

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### impl<T: Ord> Extend<T> for BTreeSet<T>

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

Extends a collection with the contents of an iterator. Read more

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#### fn extend_one(&mut self, elem: T)

🔬 This is a nightly-only experimental API. (`extend_one` #72631)

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` #72631)

Reserves capacity in a collection for the given number of additional elements. Read more

1.56.0 · source

### impl<T: Ord, const N: usize> From<[T; N]> for BTreeSet<T>

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#### fn from(arr: [T; N]) -> Self

Converts a `[T; N]` into a `BTreeSet<T>`.

    use std::collections::BTreeSet;

    let set1 = BTreeSet::from([1, 2, 3, 4]);
    let set2: BTreeSet<_> = [1, 2, 3, 4].into();
    assert_eq!(set1, set2);

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### impl<T: Ord> FromIterator<T> for BTreeSet<T>

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#### fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> BTreeSet<T>

Creates a value from an iterator. Read more

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### impl<T: Hash> Hash for BTreeSet<T>

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#### fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given `Hasher`. Read more

1.3.0 · source

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

Feeds a slice of this type into the given `Hasher`. Read more

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### impl<T> IntoIterator for BTreeSet<T>

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#### fn into_iter(self) -> IntoIter<T>ⓘNotable traits for IntoIter<T>`impl<T> Iterator for IntoIter<T> type Item = T;`

Gets an iterator for moving out the `BTreeSet`’s contents.

##### Examples

    use std::collections::BTreeSet;

    let set = BTreeSet::from([1, 2, 3, 4]);

    let v: Vec<_> = set.into_iter().collect();
    assert_eq!(v, [1, 2, 3, 4]);

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#### type Item = T

The type of the elements being iterated over.

#### type IntoIter = IntoIter<T>

Which kind of iterator are we turning this into?

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### impl<'a, T> IntoIterator for &'a BTreeSet<T>

#### 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?

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#### 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;`

Creates an iterator from a value. Read more

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### impl<T: Ord> Ord for BTreeSet<T>

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#### fn cmp(&self, other: &BTreeSet<T>) -> Ordering

This method returns an `Ordering` between `self` and `other`. Read more

1.21.0 · source

#### fn max(self, other: Self) -> Self

Compares and returns the maximum of two values. Read more

1.21.0 · source

#### fn min(self, other: Self) -> Self

Compares and returns the minimum of two values. Read more

1.50.0 · source

#### fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval. Read more

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### impl<T: PartialEq> PartialEq<BTreeSet<T>> for BTreeSet<T>

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#### fn eq(&self, other: &BTreeSet<T>) -> bool

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

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#### fn ne(&self, other: &BTreeSet<T>) -> bool

This method tests for `!=`.

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### impl<T: PartialOrd> PartialOrd<BTreeSet<T>> for BTreeSet<T>

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#### fn partial_cmp(&self, other: &BTreeSet<T>) -> Option<Ordering>

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

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

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

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

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

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

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

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

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

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### impl<T: Ord + Clone> Sub<&'_ BTreeSet<T>> for &BTreeSet<T>

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#### fn sub(self, rhs: &BTreeSet<T>) -> BTreeSet<T>

Returns the difference of `self` and `rhs` as a new `BTreeSet<T>`.

##### Examples

    use std::collections::BTreeSet;

    let a = BTreeSet::from([1, 2, 3]);
    let b = BTreeSet::from([3, 4, 5]);

    let result = &a - &b;
    let result_vec: Vec<_> = result.into_iter().collect();
    assert_eq!(result_vec, [1, 2]);

Run

#### type Output = BTreeSet<T>

The resulting type after applying the `-` operator.

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### impl<T: Eq> Eq for BTreeSet<T>

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### impl<T> StructuralEq for BTreeSet<T>

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### impl<T> StructuralPartialEq for BTreeSet<T>

## Auto Trait Implementations

### 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>

### impl<T> UnwindSafe for BTreeSet<T> where
T: RefUnwindSafe,

## 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

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### impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

#### 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,

const: unstable · source

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

Mutably borrows from an owned value. Read more

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### impl<T> From<T> for T

const: unstable · source

#### fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · source

#### 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> ToOwned for T where
T: Clone,

#### type Owned = T

The resulting type after obtaining ownership.

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#### 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)

🔬 This is a nightly-only experimental API. (`toowned_clone_into` #41263)

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.

const: unstable · source

#### 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.

const: unstable · source

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.