Struct collections::btree_set::BTreeSet1.0.0 [] [src]

pub struct BTreeSet<T> {
    // some 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.

Examples

extern crate collections; fn main() { 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); } }
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);
}

Methods

impl<T: Ord> BTreeSet<T>
[src]

fn new() -> BTreeSet<T>

Makes a new BTreeSet with a reasonable choice of B.

Examples

extern crate collections; fn main() { #![allow(unused_mut)] use std::collections::BTreeSet; let mut set: BTreeSet<i32> = BTreeSet::new(); }
use std::collections::BTreeSet;

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

impl<T> BTreeSet<T>
[src]

fn iter(&self) -> Iter<T>

Gets an iterator over the BTreeSet's contents.

Examples

extern crate collections; fn main() { use std::collections::BTreeSet; let set: BTreeSet<usize> = [1, 2, 3, 4].iter().cloned().collect(); for x in set.iter() { println!("{}", x); } let v: Vec<_> = set.iter().cloned().collect(); assert_eq!(v, [1, 2, 3, 4]); }
use std::collections::BTreeSet;

let set: BTreeSet<usize> = [1, 2, 3, 4].iter().cloned().collect();

for x in set.iter() {
    println!("{}", x);
}

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

impl<T: Ord> BTreeSet<T>
[src]

fn range<'a, Min: ?Sized + Ord, Max: ?Sized + Ord>(&'a self, min: Bound<&Min>, max: Bound<&Max>) -> Range<'a, T> where T: Borrow<Min> + Borrow<Max>

Unstable (btree_range #27787)

: matches collection reform specification, waiting for dust to settle

Constructs a double-ended iterator over a sub-range of elements in the set, starting at min, and ending at max. If min is Unbounded, then it will be treated as "negative infinity", and if max is Unbounded, then it will be treated as "positive infinity". Thus range(Unbounded, Unbounded) will yield the whole collection.

Examples

#![feature(btree_range, collections_bound)] extern crate collections; fn main() { use std::collections::BTreeSet; use std::collections::Bound::{Included, Unbounded}; 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(Included(&4), Unbounded).next()); }
#![feature(btree_range, collections_bound)]

use std::collections::BTreeSet;
use std::collections::Bound::{Included, Unbounded};

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(Included(&4), Unbounded).next());

impl<T: Ord> BTreeSet<T>
[src]

fn difference<'a>(&'a self, other: &'a BTreeSet<T>) -> Difference<'a, T>

Visits the values representing the difference, in ascending order.

Examples

extern crate collections; fn main() { 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]); }
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]);

fn symmetric_difference<'a>(&'a self, other: &'a BTreeSet<T>) -> SymmetricDifference<'a, T>

Visits the values representing the symmetric difference, in ascending order.

Examples

extern crate collections; fn main() { 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]); }
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]);

fn intersection<'a>(&'a self, other: &'a BTreeSet<T>) -> Intersection<'a, T>

Visits the values representing the intersection, in ascending order.

Examples

extern crate collections; fn main() { 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]); }
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]);

fn union<'a>(&'a self, other: &'a BTreeSet<T>) -> Union<'a, T>

Visits the values representing the union, in ascending order.

Examples

extern crate collections; fn main() { 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]); }
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]);

fn len(&self) -> usize

Returns the number of elements in the set.

Examples

extern crate collections; fn main() { use std::collections::BTreeSet; let mut v = BTreeSet::new(); assert_eq!(v.len(), 0); v.insert(1); assert_eq!(v.len(), 1); }
use std::collections::BTreeSet;

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

fn is_empty(&self) -> bool

Returns true if the set contains no elements.

Examples

extern crate collections; fn main() { use std::collections::BTreeSet; let mut v = BTreeSet::new(); assert!(v.is_empty()); v.insert(1); assert!(!v.is_empty()); }
use std::collections::BTreeSet;

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

fn clear(&mut self)

Clears the set, removing all values.

Examples

extern crate collections; fn main() { use std::collections::BTreeSet; let mut v = BTreeSet::new(); v.insert(1); v.clear(); assert!(v.is_empty()); }
use std::collections::BTreeSet;

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

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

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.

Examples

extern crate collections; fn main() { 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); }
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);

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

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

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

Examples

extern crate collections; fn main() { 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); }
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);

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

Returns true if the set is a subset of another.

Examples

extern crate collections; fn main() { 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); }
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);

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

Returns true if the set is a superset of another.

Examples

extern crate collections; fn main() { 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); }
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);

fn insert(&mut self, value: T) -> bool

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.

Examples

extern crate collections; fn main() { 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); }
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);

fn replace(&mut self, value: T) -> Option<T>
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.

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

Removes a value from the set. Returns true if 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.

Examples

extern crate collections; fn main() { use std::collections::BTreeSet; let mut set = BTreeSet::new(); set.insert(2); assert_eq!(set.remove(&2), true); assert_eq!(set.remove(&2), false); }
use std::collections::BTreeSet;

let mut set = BTreeSet::new();

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

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

fn append(&mut self, other: &mut Self)

Unstable (btree_append #19986)

: recently added as part of collections reform 2

Moves all elements from other into Self, leaving other empty.

Examples

#![feature(btree_append)] extern crate collections; fn main() { 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)); }
#![feature(btree_append)]
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));

Trait Implementations

impl<T: Ord> FromIterator<T> for BTreeSet<T>
[src]

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

Creates a value from an iterator. Read more

impl<T> IntoIterator for BTreeSet<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?

fn into_iter(self) -> IntoIter<T>

Gets an iterator for moving out the BtreeSet's contents.

Examples

extern crate collections; fn main() { 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]); }
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<'a, T> IntoIterator for &'a BTreeSet<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?

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

Creates an iterator from a value. Read more

impl<T: Ord> Extend<T> for BTreeSet<T>
[src]

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

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

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

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

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

impl<T: Ord> Default for BTreeSet<T>
[src]

fn default() -> BTreeSet<T>

Returns the "default value" for a type. Read more

impl<'a, 'b, T: Ord + Clone> Sub<&'b BTreeSet<T>> for &'a BTreeSet<T>
[src]

type Output = BTreeSet<T>

The resulting type after applying the - operator

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

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

Examples

extern crate collections; fn main() { 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]); }
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<'a, 'b, T: Ord + Clone> BitXor<&'b BTreeSet<T>> for &'a BTreeSet<T>
[src]

type Output = BTreeSet<T>

The resulting type after applying the ^ operator

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

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

Examples

extern crate collections; fn main() { 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]); }
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<'a, 'b, T: Ord + Clone> BitAnd<&'b BTreeSet<T>> for &'a BTreeSet<T>
[src]

type Output = BTreeSet<T>

The resulting type after applying the & operator

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

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

Examples

extern crate collections; fn main() { 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]); }
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<'a, 'b, T: Ord + Clone> BitOr<&'b BTreeSet<T>> for &'a BTreeSet<T>
[src]

type Output = BTreeSet<T>

The resulting type after applying the | operator

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

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

Examples

extern crate collections; fn main() { 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]); }
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: Debug> Debug for BTreeSet<T>
[src]

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

Derived Implementations

impl<T: PartialOrd> PartialOrd for BTreeSet<T>
[src]

fn partial_cmp(&self, __arg_0: &BTreeSet<T>) -> Option<Ordering>

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

fn lt(&self, __arg_0: &BTreeSet<T>) -> bool

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

fn le(&self, __arg_0: &BTreeSet<T>) -> bool

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

fn gt(&self, __arg_0: &BTreeSet<T>) -> bool

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

fn ge(&self, __arg_0: &BTreeSet<T>) -> bool

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

impl<T: Ord> Ord for BTreeSet<T>
[src]

fn cmp(&self, __arg_0: &BTreeSet<T>) -> Ordering

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

impl<T: Eq> Eq for BTreeSet<T>
[src]

impl<T: PartialEq> PartialEq for BTreeSet<T>
[src]

fn eq(&self, __arg_0: &BTreeSet<T>) -> bool

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

fn ne(&self, __arg_0: &BTreeSet<T>) -> bool

This method tests for !=.

impl<T: Hash> Hash for BTreeSet<T>
[src]

fn hash<__HT: Hasher>(&self, __arg_0: &mut __HT)

Feeds this value into the state given, updating the hasher as necessary.

fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher
1.3.0

Feeds a slice of this type into the state provided.

impl<T: Clone> Clone for BTreeSet<T>
[src]

fn clone(&self) -> BTreeSet<T>

Returns a copy of the value. Read more

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more