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Add BitOps for BTreeSet. #19514

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Dec 12, 2014
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85 changes: 84 additions & 1 deletion src/libcollections/btree/set.rs
Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,6 @@ use core::iter::Peekable;
use core::fmt::Show;

// FIXME(conventions): implement bounded iterators
// FIXME(conventions): implement BitOr, BitAnd, BitXor, and Sub

/// A set based on a B-Tree.
///
Expand Down Expand Up @@ -340,6 +339,90 @@ impl<T: Ord> Default for BTreeSet<T> {
}
}

#[unstable = "matches collection reform specification, waiting for dust to settle"]
impl<T: Ord + Clone> Sub<BTreeSet<T>,BTreeSet<T>> for BTreeSet<T> {
/// Returns the difference of `self` and `rhs` as a new `BTreeSet<T>`.
///
/// # Examples
///
/// ```
/// use std::collections::BTreeSet;
///
/// let a: BTreeSet<int> = vec![1,2,3].into_iter().collect();
/// let b: BTreeSet<int> = vec![3,4,5].into_iter().collect();
///
/// let result: BTreeSet<int> = a - b;
/// let result_vec: Vec<int> = result.into_iter().collect();
/// assert_eq!(result_vec, vec![1,2]);
/// ```
fn sub(&self, rhs: &BTreeSet<T>) -> BTreeSet<T> {
self.difference(rhs).cloned().collect()
}
}

#[unstable = "matches collection reform specification, waiting for dust to settle"]
impl<T: Ord + Clone> BitXor<BTreeSet<T>,BTreeSet<T>> for BTreeSet<T> {
/// Returns the symmetric difference of `self` and `rhs` as a new `BTreeSet<T>`.
///
/// # Examples
///
/// ```
/// use std::collections::BTreeSet;
///
/// let a: BTreeSet<int> = vec![1,2,3].into_iter().collect();
/// let b: BTreeSet<int> = vec![2,3,4].into_iter().collect();
///
/// let result: BTreeSet<int> = a ^ b;
/// let result_vec: Vec<int> = result.into_iter().collect();
/// assert_eq!(result_vec, vec![1,4]);
/// ```
fn bitxor(&self, rhs: &BTreeSet<T>) -> BTreeSet<T> {
self.symmetric_difference(rhs).cloned().collect()
}
}

#[unstable = "matches collection reform specification, waiting for dust to settle"]
impl<T: Ord + Clone> BitAnd<BTreeSet<T>,BTreeSet<T>> for BTreeSet<T> {
/// Returns the intersection of `self` and `rhs` as a new `BTreeSet<T>`.
///
/// # Examples
///
/// ```
/// use std::collections::BTreeSet;
///
/// let a: BTreeSet<int> = vec![1,2,3].into_iter().collect();
/// let b: BTreeSet<int> = vec![2,3,4].into_iter().collect();
///
/// let result: BTreeSet<int> = a & b;
/// let result_vec: Vec<int> = result.into_iter().collect();
/// assert_eq!(result_vec, vec![2,3]);
/// ```
fn bitand(&self, rhs: &BTreeSet<T>) -> BTreeSet<T> {
self.intersection(rhs).cloned().collect()
}
}

#[unstable = "matches collection reform specification, waiting for dust to settle"]
impl<T: Ord + Clone> BitOr<BTreeSet<T>,BTreeSet<T>> for BTreeSet<T> {
/// Returns the union of `self` and `rhs` as a new `BTreeSet<T>`.
///
/// # Examples
///
/// ```
/// use std::collections::BTreeSet;
///
/// let a: BTreeSet<int> = vec![1,2,3].into_iter().collect();
/// let b: BTreeSet<int> = vec![3,4,5].into_iter().collect();
///
/// let result: BTreeSet<int> = a | b;
/// let result_vec: Vec<int> = result.into_iter().collect();
/// assert_eq!(result_vec, vec![1,2,3,4,5]);
/// ```
fn bitor(&self, rhs: &BTreeSet<T>) -> BTreeSet<T> {
self.union(rhs).cloned().collect()
}
}

impl<T: Show> Show for BTreeSet<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
try!(write!(f, "{{"));
Expand Down