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+//! `FixedBitSet` is a simple fixed size set of bits.
+//!
+//!
+//! ### Crate features
+//!
+//! - `std` (default feature)
+//! Disabling this feature disables using std and instead uses crate alloc.
+//! Requires Rust 1.36 to disable.
+//!
+//! ### Rust Version
+//!
+//! This version of fixedbitset requires Rust 1.31 or later.
+//!
+#![doc(html_root_url="https://docs.rs/fixedbitset/0.2/")]
+
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg(not(feature = "std"))]
+extern crate alloc;
+#[cfg(not(feature = "std"))]
+use alloc::{
+ vec,
+ vec::Vec,
+};
+
+#[cfg(not(feature = "std"))]
+use core as std;
+
+mod range;
+
+use std::ops::{BitAnd, BitAndAssign, BitOr, BitOrAssign, BitXor, BitXorAssign, Index};
+use std::cmp::{Ord, Ordering};
+use std::iter::{Chain, FromIterator};
+pub use range::IndexRange;
+
+const BITS: usize = 32;
+type Block = u32;
+
+#[inline]
+fn div_rem(x: usize, d: usize) -> (usize, usize)
+{
+ (x / d, x % d)
+}
+
+/// `FixedBitSet` is a simple fixed size set of bits that each can
+/// be enabled (1 / **true**) or disabled (0 / **false**).
+///
+/// The bit set has a fixed capacity in terms of enabling bits (and the
+/// capacity can grow using the `grow` method).
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
+pub struct FixedBitSet {
+ data: Vec<Block>,
+ /// length in bits
+ length: usize,
+}
+
+impl FixedBitSet
+{
+ /// Create a new **FixedBitSet** with a specific number of bits,
+ /// all initially clear.
+ pub fn with_capacity(bits: usize) -> Self
+ {
+ let (mut blocks, rem) = div_rem(bits, BITS);
+ blocks += (rem > 0) as usize;
+ FixedBitSet {
+ data: vec![0; blocks],
+ length: bits,
+ }
+ }
+ /// Grow capacity to **bits**, all new bits initialized to zero
+ pub fn grow(&mut self, bits: usize) {
+ let (mut blocks, rem) = div_rem(bits, BITS);
+ blocks += (rem > 0) as usize;
+ if bits > self.length {
+ self.length = bits;
+ self.data.resize(blocks, 0);
+ }
+ }
+
+ /// Return the length of the `FixedBitSet` in bits.
+ #[inline]
+ pub fn len(&self) -> usize { self.length }
+
+ /// Return **true** if the bit is enabled in the **FixedBitSet**,
+ /// **false** otherwise.
+ ///
+ /// Note: bits outside the capacity are always disabled.
+ ///
+ /// Note: Also available with index syntax: `bitset[bit]`.
+ #[inline]
+ pub fn contains(&self, bit: usize) -> bool
+ {
+ let (block, i) = div_rem(bit, BITS);
+ match self.data.get(block) {
+ None => false,
+ Some(b) => (b & (1 << i)) != 0,
+ }
+ }
+
+ /// Clear all bits.
+ #[inline]
+ pub fn clear(&mut self)
+ {
+ for elt in &mut self.data[..] {
+ *elt = 0
+ }
+ }
+
+ /// Enable `bit`.
+ ///
+ /// **Panics** if **bit** is out of bounds.
+ #[inline]
+ pub fn insert(&mut self, bit: usize)
+ {
+ assert!(bit < self.length);
+ let (block, i) = div_rem(bit, BITS);
+ unsafe {
+ *self.data.get_unchecked_mut(block) |= 1 << i;
+ }
+ }
+
+ /// Enable `bit`, and return its previous value.
+ ///
+ /// **Panics** if **bit** is out of bounds.
+ #[inline]
+ pub fn put(&mut self, bit: usize) -> bool
+ {
+ assert!(bit < self.length);
+ let (block, i) = div_rem(bit, BITS);
+ unsafe {
+ let word = self.data.get_unchecked_mut(block);
+ let prev = *word & (1 << i) != 0;
+ *word |= 1 << i;
+ prev
+ }
+ }
+ /// Toggle `bit` (inverting its state).
+ ///
+ /// ***Panics*** if **bit** is out of bounds
+ #[inline]
+ pub fn toggle(&mut self, bit: usize) {
+ assert!(bit < self.length);
+ let (block, i) = div_rem(bit, BITS);
+ unsafe {
+ *self.data.get_unchecked_mut(block) ^= 1 << i;
+ }
+ }
+ /// **Panics** if **bit** is out of bounds.
+ #[inline]
+ pub fn set(&mut self, bit: usize, enabled: bool)
+ {
+ assert!(bit < self.length);
+ let (block, i) = div_rem(bit, BITS);
+ unsafe {
+ let elt = self.data.get_unchecked_mut(block);
+ if enabled {
+ *elt |= 1 << i;
+ } else {
+ *elt &= !(1 << i);
+ }
+ }
+ }
+
+ /// Copies boolean value from specified bit to the specified bit.
+ ///
+ /// **Panics** if **to** is out of bounds.
+ #[inline]
+ pub fn copy_bit(&mut self, from: usize, to: usize)
+ {
+ assert!(to < self.length);
+ let (to_block, t) = div_rem(to, BITS);
+ let enabled = self.contains(from);
+ unsafe {
+ let to_elt = self.data.get_unchecked_mut(to_block);
+ if enabled {
+ *to_elt |= 1 << t;
+ } else {
+ *to_elt &= !(1 << t);
+ }
+ }
+ }
+
+ /// Count the number of set bits in the given bit range.
+ ///
+ /// Use `..` to count the whole content of the bitset.
+ ///
+ /// **Panics** if the range extends past the end of the bitset.
+ #[inline]
+ pub fn count_ones<T: IndexRange>(&self, range: T) -> usize
+ {
+ Masks::new(range, self.length)
+ .map(|(block, mask)| unsafe {
+ let value = *self.data.get_unchecked(block);
+ (value & mask).count_ones() as usize
+ })
+ .sum()
+ }
+
+ /// Sets every bit in the given range to the given state (`enabled`)
+ ///
+ /// Use `..` to toggle the whole bitset.
+ ///
+ /// **Panics** if the range extends past the end of the bitset.
+ #[inline]
+ pub fn set_range<T: IndexRange>(&mut self, range: T, enabled: bool)
+ {
+ for (block, mask) in Masks::new(range, self.length) {
+ unsafe {
+ if enabled {
+ *self.data.get_unchecked_mut(block) |= mask;
+ } else {
+ *self.data.get_unchecked_mut(block) &= !mask;
+ }
+ }
+ }
+ }
+
+ /// Enables every bit in the given range.
+ ///
+ /// Use `..` to make the whole bitset ones.
+ ///
+ /// **Panics** if the range extends past the end of the bitset.
+ #[inline]
+ pub fn insert_range<T: IndexRange>(&mut self, range: T)
+ {
+ self.set_range(range, true);
+ }
+
+ /// View the bitset as a slice of `u32` blocks
+ #[inline]
+ pub fn as_slice(&self) -> &[u32]
+ {
+ &self.data
+ }
+
+ /// View the bitset as a mutable slice of `u32` blocks. Writing past the bitlength in the last
+ /// will cause `contains` to return potentially incorrect results for bits past the bitlength.
+ #[inline]
+ pub fn as_mut_slice(&mut self) -> &mut [u32]
+ {
+ &mut self.data
+ }
+
+ /// Iterates over all enabled bits.
+ ///
+ /// Iterator element is the index of the `1` bit, type `usize`.
+ #[inline]
+ pub fn ones(&self) -> Ones {
+ match self.as_slice().split_first() {
+ Some((&block, rem)) => {
+ Ones {
+ current_bit_idx: 0,
+ current_block_idx: 0,
+ current_block: block,
+ remaining_blocks: rem
+ }
+ }
+ None => {
+ Ones {
+ current_bit_idx: 0,
+ current_block_idx: 0,
+ current_block: 0,
+ remaining_blocks: &[]
+ }
+ }
+ }
+ }
+
+ /// Returns a lazy iterator over the intersection of two `FixedBitSet`s
+ pub fn intersection<'a>(&'a self, other: &'a FixedBitSet) -> Intersection<'a>
+ {
+ Intersection {
+ iter: self.ones(),
+ other: other,
+ }
+ }
+
+ /// Returns a lazy iterator over the union of two `FixedBitSet`s.
+ pub fn union<'a>(&'a self, other: &'a FixedBitSet) -> Union<'a>
+ {
+ Union {
+ iter: self.ones().chain(other.difference(self)),
+ }
+ }
+
+ /// Returns a lazy iterator over the difference of two `FixedBitSet`s. The difference of `a`
+ /// and `b` is the elements of `a` which are not in `b`.
+ pub fn difference<'a>(&'a self, other: &'a FixedBitSet) -> Difference<'a>
+ {
+ Difference {
+ iter: self.ones(),
+ other: other,
+ }
+ }
+
+ /// Returns a lazy iterator over the symmetric difference of two `FixedBitSet`s.
+ /// The symmetric difference of `a` and `b` is the elements of one, but not both, sets.
+ pub fn symmetric_difference<'a>(&'a self, other: &'a FixedBitSet) -> SymmetricDifference<'a>
+ {
+ SymmetricDifference {
+ iter: self.difference(other).chain(other.difference(self)),
+ }
+ }
+
+ /// In-place union of two `FixedBitSet`s.
+ pub fn union_with(&mut self, other: &FixedBitSet)
+ {
+ if other.len() >= self.len() {
+ self.grow(other.len());
+ }
+ for (x, y) in self.data.iter_mut().zip(other.data.iter()) {
+ *x |= *y;
+ }
+ }
+
+ /// In-place intersection of two `FixedBitSet`s.
+ pub fn intersect_with(&mut self, other: &FixedBitSet)
+ {
+ for (x, y) in self.data.iter_mut().zip(other.data.iter()) {
+ *x &= *y;
+ }
+ let mn = std::cmp::min(self.data.len(), other.data.len());
+ for wd in &mut self.data[mn..] {
+ *wd = 0;
+ }
+ }
+
+ /// In-place symmetric difference of two `FixedBitSet`s.
+ pub fn symmetric_difference_with(&mut self, other: &FixedBitSet)
+ {
+ if other.len() >= self.len() {
+ self.grow(other.len());
+ }
+ for (x, y) in self.data.iter_mut().zip(other.data.iter()) {
+ *x ^= *y;
+ }
+ }
+
+ /// Returns `true` if `self` has no elements in common with `other`. This
+ /// is equivalent to checking for an empty intersection.
+ pub fn is_disjoint(&self, other: &FixedBitSet) -> bool {
+ self.data.iter().zip(other.data.iter()).all(|(x, y)| x & y == 0)
+ }
+
+ /// Returns `true` if the set is a subset of another, i.e. `other` contains
+ /// at least all the values in `self`.
+ pub fn is_subset(&self, other: &FixedBitSet) -> bool {
+ self.data.iter().zip(other.data.iter()).all(|(x, y)| x & !y == 0) &&
+ self.data.iter().skip(other.data.len()).all(|x| *x == 0)
+ }
+
+ /// Returns `true` if the set is a superset of another, i.e. `self` contains
+ /// at least all the values in `other`.
+ pub fn is_superset(&self, other: &FixedBitSet) -> bool {
+ other.is_subset(self)
+ }
+}
+
+/// An iterator producing elements in the difference of two sets.
+///
+/// This struct is created by the [`FixedBitSet::difference`] method.
+pub struct Difference<'a> {
+ iter: Ones<'a>,
+ other: &'a FixedBitSet,
+}
+
+impl<'a> Iterator for Difference<'a> {
+ type Item = usize;
+
+ #[inline]
+ fn next(&mut self) -> Option<Self::Item> {
+ while let Some(nxt) = self.iter.next() {
+ if !self.other.contains(nxt) {
+ return Some(nxt);
+ }
+ }
+ None
+ }
+}
+
+/// An iterator producing elements in the symmetric difference of two sets.
+///
+/// This struct is created by the [`FixedBitSet::symmetric_difference`] method.
+pub struct SymmetricDifference<'a> {
+ iter: Chain<Difference<'a>, Difference<'a>>,
+}
+
+impl<'a> Iterator for SymmetricDifference<'a> {
+ type Item = usize;
+
+ #[inline]
+ fn next(&mut self) -> Option<Self::Item> {
+ self.iter.next()
+ }
+}
+
+
+/// An iterator producing elements in the intersection of two sets.
+///
+/// This struct is created by the [`FixedBitSet::intersection`] method.
+pub struct Intersection<'a> {
+ iter: Ones<'a>,
+ other: &'a FixedBitSet,
+}
+
+impl<'a> Iterator for Intersection<'a> {
+ type Item = usize; // the bit position of the '1'
+
+ #[inline]
+ fn next(&mut self) -> Option<Self::Item> {
+ while let Some(nxt) = self.iter.next() {
+ if self.other.contains(nxt) {
+ return Some(nxt);
+ }
+ }
+ None
+ }
+}
+
+/// An iterator producing elements in the union of two sets.
+///
+/// This struct is created by the [`FixedBitSet::union`] method.
+pub struct Union<'a> {
+ iter: Chain<Ones<'a>, Difference<'a>>,
+}
+
+impl<'a> Iterator for Union<'a> {
+ type Item = usize;
+
+ #[inline]
+ fn next(&mut self) -> Option<Self::Item> {
+ self.iter.next()
+ }
+}
+
+
+struct Masks {
+ first_block: usize,
+ first_mask: Block,
+ last_block: usize,
+ last_mask: Block,
+}
+
+impl Masks {
+ #[inline]
+ fn new<T: IndexRange>(range: T, length: usize) -> Masks {
+ let start = range.start().unwrap_or(0);
+ let end = range.end().unwrap_or(length);
+ assert!(start <= end && end <= length);
+
+ let (first_block, first_rem) = div_rem(start, BITS);
+ let (last_block, last_rem) = div_rem(end, BITS);
+
+ Masks {
+ first_block: first_block as usize,
+ first_mask: Block::max_value() << first_rem,
+ last_block: last_block as usize,
+ last_mask: (Block::max_value() >> 1) >> (BITS - last_rem - 1),
+ // this is equivalent to `MAX >> (BITS - x)` with correct semantics when x == 0.
+ }
+ }
+}
+
+impl Iterator for Masks {
+ type Item = (usize, Block);
+ #[inline]
+ fn next(&mut self) -> Option<Self::Item> {
+ match self.first_block.cmp(&self.last_block) {
+ Ordering::Less => {
+ let res = (self.first_block, self.first_mask);
+ self.first_block += 1;
+ self.first_mask = !0;
+ Some(res)
+ }
+ Ordering::Equal => {
+ let mask = self.first_mask & self.last_mask;
+ let res = if mask == 0 {
+ None
+ } else {
+ Some((self.first_block, mask))
+ };
+ self.first_block += 1;
+ res
+ }
+ Ordering::Greater => None,
+ }
+ }
+}
+
+
+/// An iterator producing the indices of the set bit in a set.
+///
+/// This struct is created by the [`FixedBitSet::ones`] method.
+pub struct Ones<'a> {
+ current_bit_idx: usize,
+ current_block_idx: usize,
+ remaining_blocks: &'a [Block],
+ current_block: Block
+}
+
+impl<'a> Iterator for Ones<'a> {
+ type Item = usize; // the bit position of the '1'
+
+ #[inline]
+ fn next(&mut self) -> Option<Self::Item> {
+ let mut block = self.current_block;
+ let mut idx = self.current_bit_idx;
+
+ loop {
+ loop {
+ if (block & 1) == 1 {
+ self.current_block = block >> 1;
+ self.current_bit_idx = idx + 1;
+ return Some(idx);
+ }
+ // reordering the two lines below makes a huge (2x) difference in performance!
+ block = block >> 1;
+ idx += 1;
+ if block == 0 {
+ break;
+ }
+ }
+
+ // go to next block
+ match self.remaining_blocks.split_first() {
+ Some((&next_block, rest)) => {
+ self.remaining_blocks = rest;
+ self.current_block_idx += 1;
+ idx = self.current_block_idx * BITS;
+ block = next_block;
+ }
+ None => {
+ // last block => done
+ return None;
+ }
+ }
+ }
+ }
+}
+
+impl Clone for FixedBitSet
+{
+ #[inline]
+ fn clone(&self) -> Self
+ {
+ FixedBitSet {
+ data: self.data.clone(),
+ length: self.length,
+ }
+ }
+}
+
+/// Return **true** if the bit is enabled in the bitset,
+/// or **false** otherwise.
+///
+/// Note: bits outside the capacity are always disabled, and thus
+/// indexing a FixedBitSet will not panic.
+impl Index<usize> for FixedBitSet
+{
+ type Output = bool;
+
+ #[inline]
+ fn index(&self, bit: usize) -> &bool
+ {
+ if self.contains(bit) {
+ &true
+ } else {
+ &false
+ }
+ }
+}
+
+/// Sets the bit at index **i** to **true** for each item **i** in the input **src**.
+impl Extend<usize> for FixedBitSet
+{
+ fn extend<I: IntoIterator<Item=usize>>(&mut self, src: I) {
+ let iter = src.into_iter();
+ for i in iter {
+ if i >= self.len() {
+ self.grow(i + 1);
+ }
+ self.put(i);
+ }
+ }
+}
+
+/// Return a FixedBitSet containing bits set to **true** for every bit index in
+/// the iterator, other bits are set to **false**.
+impl FromIterator<usize> for FixedBitSet
+{
+ fn from_iter<I: IntoIterator<Item=usize>>(src: I) -> Self {
+ let mut fbs = FixedBitSet::with_capacity(0);
+ fbs.extend(src);
+ fbs
+ }
+}
+
+impl <'a> BitAnd for &'a FixedBitSet
+{
+ type Output = FixedBitSet;
+ fn bitand(self, other: &FixedBitSet) -> FixedBitSet {
+ let (short, long) = {
+ if self.len() <= other.len() {
+ (&self.data, &other.data)
+ } else {
+ (&other.data, &self.data)
+ }
+ };
+ let mut data = short.clone();
+ for (data, block) in data.iter_mut().zip(long.iter()) {
+ *data &= *block;
+ }
+ let len = std::cmp::min(self.len(), other.len());
+ FixedBitSet{data: data, length: len}
+ }
+}
+
+
+impl <'a> BitAndAssign for FixedBitSet
+{
+ fn bitand_assign(&mut self, other: Self) {
+ self.intersect_with(&other);
+ }
+}
+
+impl <'a> BitOr for &'a FixedBitSet
+{
+ type Output = FixedBitSet;
+ fn bitor(self, other: &FixedBitSet) -> FixedBitSet {
+ let (short, long) = {
+ if self.len() <= other.len() {
+ (&self.data, &other.data)
+ } else {
+ (&other.data, &self.data)
+ }
+ };
+ let mut data = long.clone();
+ for (data, block) in data.iter_mut().zip(short.iter()) {
+ *data |= *block;
+ }
+ let len = std::cmp::max(self.len(), other.len());
+ FixedBitSet{data: data, length: len}
+ }
+}
+
+impl <'a> BitOrAssign for FixedBitSet
+{
+ fn bitor_assign(&mut self, other: Self) {
+ self.union_with(&other);
+ }
+}
+
+impl <'a> BitXor for &'a FixedBitSet
+{
+ type Output = FixedBitSet;
+ fn bitxor(self, other: &FixedBitSet) -> FixedBitSet {
+ let (short, long) = {
+ if self.len() <= other.len() {
+ (&self.data, &other.data)
+ } else {
+ (&other.data, &self.data)
+ }
+ };
+ let mut data = long.clone();
+ for (data, block) in data.iter_mut().zip(short.iter()) {
+ *data ^= *block;
+ }
+ let len = std::cmp::max(self.len(), other.len());
+ FixedBitSet{data: data, length: len}
+ }
+}
+
+impl <'a> BitXorAssign for FixedBitSet
+{
+ fn bitxor_assign(&mut self, other: Self) {
+ self.symmetric_difference_with(&other);
+ }
+}
+
+#[test]
+fn it_works() {
+ const N: usize = 50;
+ let mut fb = FixedBitSet::with_capacity(N);
+
+
+ for i in 0..(N + 10) {
+ assert_eq!(fb.contains(i), false);
+ }
+
+ fb.insert(10);
+ fb.set(11, false);
+ fb.set(12, false);
+ fb.set(12, true);
+ fb.set(N-1, true);
+
+ assert!(fb.contains(10));
+ assert!(!fb.contains(11));
+ assert!(fb.contains(12));
+ assert!(fb.contains(N-1));
+ for i in 0..N {
+ let contain = i == 10 || i == 12 || i == N - 1;
+ assert_eq!(contain, fb[i]);
+ }
+
+ fb.clear();
+}
+
+#[test]
+fn grow() {
+ let mut fb = FixedBitSet::with_capacity(48);
+ for i in 0..fb.len() {
+ fb.set(i, true);
+ }
+
+ let old_len = fb.len();
+ fb.grow(72);
+ for j in 0..fb.len() {
+ assert_eq!(fb.contains(j), j < old_len);
+ }
+ fb.set(64, true);
+ assert!(fb.contains(64));
+}
+
+#[test]
+fn test_toggle() {
+ let mut fb = FixedBitSet::with_capacity(16);
+ fb.toggle(1);
+ fb.put(2);
+ fb.toggle(2);
+ fb.put(3);
+ assert!(fb.contains(1));
+ assert!(!fb.contains(2));
+ assert!(fb.contains(3));
+}
+
+#[test]
+fn copy_bit() {
+ let mut fb = FixedBitSet::with_capacity(48);
+ for i in 0..fb.len() {
+ fb.set(i, true);
+ }
+ fb.set(42, false);
+ fb.copy_bit(42, 2);
+ assert!(!fb.contains(42));
+ assert!(!fb.contains(2));
+ assert!(fb.contains(1));
+ fb.copy_bit(1, 42);
+ assert!(fb.contains(42));
+ fb.copy_bit(1024, 42);
+ assert!(!fb[42]);
+}
+
+#[test]
+fn count_ones() {
+ let mut fb = FixedBitSet::with_capacity(100);
+ fb.set(11, true);
+ fb.set(12, true);
+ fb.set(7, true);
+ fb.set(35, true);
+ fb.set(40, true);
+ fb.set(77, true);
+ fb.set(95, true);
+ fb.set(50, true);
+ fb.set(99, true);
+ assert_eq!(fb.count_ones(..7), 0);
+ assert_eq!(fb.count_ones(..8), 1);
+ assert_eq!(fb.count_ones(..11), 1);
+ assert_eq!(fb.count_ones(..12), 2);
+ assert_eq!(fb.count_ones(..13), 3);
+ assert_eq!(fb.count_ones(..35), 3);
+ assert_eq!(fb.count_ones(..36), 4);
+ assert_eq!(fb.count_ones(..40), 4);
+ assert_eq!(fb.count_ones(..41), 5);
+ assert_eq!(fb.count_ones(50..), 4);
+ assert_eq!(fb.count_ones(70..95), 1);
+ assert_eq!(fb.count_ones(70..96), 2);
+ assert_eq!(fb.count_ones(70..99), 2);
+ assert_eq!(fb.count_ones(..), 9);
+ assert_eq!(fb.count_ones(0..100), 9);
+ assert_eq!(fb.count_ones(0..0), 0);
+ assert_eq!(fb.count_ones(100..100), 0);
+ assert_eq!(fb.count_ones(7..), 9);
+ assert_eq!(fb.count_ones(8..), 8);
+}
+
+#[test]
+fn ones() {
+ let mut fb = FixedBitSet::with_capacity(100);
+ fb.set(11, true);
+ fb.set(12, true);
+ fb.set(7, true);
+ fb.set(35, true);
+ fb.set(40, true);
+ fb.set(77, true);
+ fb.set(95, true);
+ fb.set(50, true);
+ fb.set(99, true);
+
+ let ones: Vec<_> = fb.ones().collect();
+
+ assert_eq!(vec![7, 11, 12, 35, 40, 50, 77, 95, 99], ones);
+}
+
+#[test]
+fn iter_ones_range() {
+ fn test_range(from: usize, to: usize, capa: usize) {
+ assert!(to <= capa);
+ let mut fb = FixedBitSet::with_capacity(capa);
+ for i in from..to {
+ fb.insert(i);
+ }
+ let ones: Vec<_> = fb.ones().collect();
+ let expected: Vec<_> = (from..to).collect();
+ assert_eq!(expected, ones);
+ }
+
+ for i in 0..100 {
+ test_range(i, 100, 100);
+ test_range(0, i, 100);
+ }
+}
+
+#[should_panic]
+#[test]
+fn count_ones_oob() {
+ let fb = FixedBitSet::with_capacity(100);
+ fb.count_ones(90..101);
+}
+
+#[should_panic]
+#[test]
+fn count_ones_negative_range() {
+ let fb = FixedBitSet::with_capacity(100);
+ fb.count_ones(90..80);
+}
+
+#[test]
+fn count_ones_panic() {
+ for i in 1..128 {
+ let fb = FixedBitSet::with_capacity(i);
+ for j in 0..fb.len() + 1 {
+ for k in j..fb.len() + 1 {
+ assert_eq!(fb.count_ones(j..k), 0);
+ }
+ }
+ }
+}
+
+
+#[test]
+fn default() {
+ let fb = FixedBitSet::default();
+ assert_eq!(fb.len(), 0);
+}
+
+#[test]
+fn insert_range() {
+ let mut fb = FixedBitSet::with_capacity(97);
+ fb.insert_range(..3);
+ fb.insert_range(9..32);
+ fb.insert_range(37..81);
+ fb.insert_range(90..);
+ for i in 0..97 {
+ assert_eq!(fb.contains(i), i<3 || 9<=i&&i<32 || 37<=i&&i<81 || 90<=i);
+ }
+ assert!(!fb.contains(97));
+ assert!(!fb.contains(127));
+ assert!(!fb.contains(128));
+}
+
+#[test]
+fn set_range() {
+ let mut fb = FixedBitSet::with_capacity(48);
+ fb.insert_range(..);
+
+ fb.set_range(..32, false);
+ fb.set_range(37.., false);
+ fb.set_range(5..9, true);
+ fb.set_range(40..40, true);
+
+ for i in 0..48 {
+ assert_eq!(fb.contains(i), 5<=i&&i<9 || 32<=i&&i<37);
+ }
+ assert!(!fb.contains(48));
+ assert!(!fb.contains(64));
+}
+
+#[test]
+fn bitand_equal_lengths() {
+ let len = 109;
+ let a_end = 59;
+ let b_start = 23;
+ let mut a = FixedBitSet::with_capacity(len);
+ let mut b = FixedBitSet::with_capacity(len);
+ a.set_range(..a_end, true);
+ b.set_range(b_start.., true);
+ let ab = &a & &b;
+ for i in 0..b_start {
+ assert!(!ab.contains(i));
+ }
+ for i in b_start..a_end {
+ assert!(ab.contains(i));
+ }
+ for i in a_end..len {
+ assert!(!ab.contains(i));
+ }
+ assert_eq!(a.len(), ab.len());
+}
+
+#[test]
+fn bitand_first_smaller() {
+ let a_len = 113;
+ let b_len = 137;
+ let len = std::cmp::min(a_len, b_len);
+ let a_end = 97;
+ let b_start = 89;
+ let mut a = FixedBitSet::with_capacity(a_len);
+ let mut b = FixedBitSet::with_capacity(b_len);
+ a.set_range(..a_end, true);
+ b.set_range(b_start.., true);
+ let ab = &a & &b;
+ for i in 0..b_start {
+ assert!(!ab.contains(i));
+ }
+ for i in b_start..a_end {
+ assert!(ab.contains(i));
+ }
+ for i in a_end..len {
+ assert!(!ab.contains(i));
+ }
+ assert_eq!(a.len(), ab.len());
+}
+
+#[test]
+fn bitand_first_larger() {
+ let a_len = 173;
+ let b_len = 137;
+ let len = std::cmp::min(a_len, b_len);
+ let a_end = 107;
+ let b_start = 43;
+ let mut a = FixedBitSet::with_capacity(a_len);
+ let mut b = FixedBitSet::with_capacity(b_len);
+ a.set_range(..a_end, true);
+ b.set_range(b_start.., true);
+ let ab = &a & &b;
+ for i in 0..b_start {
+ assert!(!ab.contains(i));
+ }
+ for i in b_start..a_end {
+ assert!(ab.contains(i));
+ }
+ for i in a_end..len {
+ assert!(!ab.contains(i));
+ }
+ assert_eq!(b.len(), ab.len());
+}
+
+#[test]
+fn intersection() {
+ let len = 109;
+ let a_end = 59;
+ let b_start = 23;
+ let mut a = FixedBitSet::with_capacity(len);
+ let mut b = FixedBitSet::with_capacity(len);
+ a.set_range(..a_end, true);
+ b.set_range(b_start.., true);
+
+ let ab = a.intersection(&b).collect::<FixedBitSet>();
+
+ for i in 0..b_start {
+ assert!(!ab.contains(i));
+ }
+ for i in b_start..a_end {
+ assert!(ab.contains(i));
+ }
+ for i in a_end..len {
+ assert!(!ab.contains(i));
+ }
+}
+
+#[test]
+fn union() {
+ let a_len = 173;
+ let b_len = 137;
+ let a_start = 139;
+ let b_end = 107;
+ let mut a = FixedBitSet::with_capacity(a_len);
+ let mut b = FixedBitSet::with_capacity(b_len);
+ a.set_range(a_start.., true);
+ b.set_range(..b_end, true);
+ let ab = a.union(&b).collect::<FixedBitSet>();
+ for i in a_start..a_len {
+ assert!(ab.contains(i));
+ }
+ for i in 0..b_end {
+ assert!(ab.contains(i));
+ }
+ for i in b_end..a_start {
+ assert!(!ab.contains(i));
+ }
+}
+
+#[test]
+fn difference() {
+ let a_len = 83;
+ let b_len = 151;
+ let a_start = 0;
+ let a_end = 79;
+ let b_start = 53;
+ let mut a = FixedBitSet::with_capacity(a_len);
+ let mut b = FixedBitSet::with_capacity(b_len);
+ a.set_range(a_start..a_end, true);
+ b.set_range(b_start..b_len, true);
+ let a_diff_b = a.difference(&b).collect::<FixedBitSet>();
+ for i in a_start..b_start {
+ assert!(a_diff_b.contains(i));
+ }
+ for i in b_start..b_len {
+ assert!(!a_diff_b.contains(i));
+ }
+}
+
+#[test]
+fn symmetric_difference() {
+ let a_len = 83;
+ let b_len = 151;
+ let a_start = 47;
+ let a_end = 79;
+ let b_start = 53;
+ let mut a = FixedBitSet::with_capacity(a_len);
+ let mut b = FixedBitSet::with_capacity(b_len);
+ a.set_range(a_start..a_end, true);
+ b.set_range(b_start..b_len, true);
+ let a_sym_diff_b = a.symmetric_difference(&b).collect::<FixedBitSet>();
+ for i in 0..a_start {
+ assert!(!a_sym_diff_b.contains(i));
+ }
+ for i in a_start..b_start {
+ assert!(a_sym_diff_b.contains(i));
+ }
+ for i in b_start..a_end {
+ assert!(!a_sym_diff_b.contains(i));
+ }
+ for i in a_end..b_len {
+ assert!(a_sym_diff_b.contains(i));
+ }
+}
+
+#[test]
+fn bitor_equal_lengths() {
+ let len = 109;
+ let a_start = 17;
+ let a_end = 23;
+ let b_start = 19;
+ let b_end = 59;
+ let mut a = FixedBitSet::with_capacity(len);
+ let mut b = FixedBitSet::with_capacity(len);
+ a.set_range(a_start..a_end, true);
+ b.set_range(b_start..b_end, true);
+ let ab = &a | &b;
+ for i in 0..a_start {
+ assert!(!ab.contains(i));
+ }
+ for i in a_start..b_end {
+ assert!(ab.contains(i));
+ }
+ for i in b_end..len {
+ assert!(!ab.contains(i));
+ }
+ assert_eq!(ab.len(), len);
+}
+
+#[test]
+fn bitor_first_smaller() {
+ let a_len = 113;
+ let b_len = 137;
+ let a_end = 89;
+ let b_start = 97;
+ let mut a = FixedBitSet::with_capacity(a_len);
+ let mut b = FixedBitSet::with_capacity(b_len);
+ a.set_range(..a_end, true);
+ b.set_range(b_start.., true);
+ let ab = &a | &b;
+ for i in 0..a_end {
+ assert!(ab.contains(i));
+ }
+ for i in a_end..b_start {
+ assert!(!ab.contains(i));
+ }
+ for i in b_start..b_len {
+ assert!(ab.contains(i));
+ }
+ assert_eq!(b_len, ab.len());
+}
+
+#[test]
+fn bitor_first_larger() {
+ let a_len = 173;
+ let b_len = 137;
+ let a_start = 139;
+ let b_end = 107;
+ let mut a = FixedBitSet::with_capacity(a_len);
+ let mut b = FixedBitSet::with_capacity(b_len);
+ a.set_range(a_start.., true);
+ b.set_range(..b_end, true);
+ let ab = &a | &b;
+ for i in a_start..a_len {
+ assert!(ab.contains(i));
+ }
+ for i in 0..b_end {
+ assert!(ab.contains(i));
+ }
+ for i in b_end..a_start {
+ assert!(!ab.contains(i));
+ }
+ assert_eq!(a_len, ab.len());
+}
+
+#[test]
+fn bitxor_equal_lengths() {
+ let len = 109;
+ let a_end = 59;
+ let b_start = 23;
+ let mut a = FixedBitSet::with_capacity(len);
+ let mut b = FixedBitSet::with_capacity(len);
+ a.set_range(..a_end, true);
+ b.set_range(b_start.., true);
+ let ab = &a ^ &b;
+ for i in 0..b_start {
+ assert!(ab.contains(i));
+ }
+ for i in b_start..a_end {
+ assert!(!ab.contains(i));
+ }
+ for i in a_end..len {
+ assert!(ab.contains(i));
+ }
+ assert_eq!(a.len(), ab.len());
+}
+
+#[test]
+fn bitxor_first_smaller() {
+ let a_len = 113;
+ let b_len = 137;
+ let len = std::cmp::max(a_len, b_len);
+ let a_end = 97;
+ let b_start = 89;
+ let mut a = FixedBitSet::with_capacity(a_len);
+ let mut b = FixedBitSet::with_capacity(b_len);
+ a.set_range(..a_end, true);
+ b.set_range(b_start.., true);
+ let ab = &a ^ &b;
+ for i in 0..b_start {
+ assert!(ab.contains(i));
+ }
+ for i in b_start..a_end {
+ assert!(!ab.contains(i));
+ }
+ for i in a_end..len {
+ assert!(ab.contains(i));
+ }
+ assert_eq!(b.len(), ab.len());
+}
+
+#[test]
+fn bitxor_first_larger() {
+ let a_len = 173;
+ let b_len = 137;
+ let len = std::cmp::max(a_len, b_len);
+ let a_end = 107;
+ let b_start = 43;
+ let mut a = FixedBitSet::with_capacity(a_len);
+ let mut b = FixedBitSet::with_capacity(b_len);
+ a.set_range(..a_end, true);
+ b.set_range(b_start.., true);
+ let ab = &a ^ &b;
+ for i in 0..b_start {
+ assert!(ab.contains(i));
+ }
+ for i in b_start..a_end {
+ assert!(!ab.contains(i));
+ }
+ for i in a_end..b_len {
+ assert!(ab.contains(i));
+ }
+ for i in b_len..len {
+ assert!(!ab.contains(i));
+ }
+ assert_eq!(a.len(), ab.len());
+}
+
+#[test]
+fn bitand_assign_shorter() {
+ let a_ones: Vec<usize> = vec![2, 3, 7, 19, 31, 32, 37, 41, 43, 47, 71, 73, 101];
+ let b_ones: Vec<usize> = vec![2, 7, 8, 11, 23, 31, 32];
+ let a_and_b: Vec<usize> = vec![2, 7, 31, 32];
+ let mut a = a_ones.iter().cloned().collect::<FixedBitSet>();
+ let b = b_ones.iter().cloned().collect::<FixedBitSet>();
+ a &= b;
+ let res = a.ones().collect::<Vec<usize>>();
+
+ assert!(res == a_and_b);
+}
+
+#[test]
+fn bitand_assign_longer() {
+ let a_ones: Vec<usize> = vec![2, 7, 8, 11, 23, 31, 32];
+ let b_ones: Vec<usize> = vec![2, 3, 7, 19, 31, 32, 37, 41, 43, 47, 71, 73, 101];
+ let a_and_b: Vec<usize> = vec![2, 7, 31, 32];
+ let mut a = a_ones.iter().cloned().collect::<FixedBitSet>();
+ let b = b_ones.iter().cloned().collect::<FixedBitSet>();
+ a &= b;
+ let res = a.ones().collect::<Vec<usize>>();
+ assert!(res == a_and_b);
+}
+
+#[test]
+fn bitor_assign_shorter() {
+ let a_ones: Vec<usize> = vec![2, 3, 7, 19, 31, 32, 37, 41, 43, 47, 71, 73, 101];
+ let b_ones: Vec<usize> = vec![2, 7, 8, 11, 23, 31, 32];
+ let a_or_b: Vec<usize> = vec![2, 3, 7, 8, 11, 19, 23, 31, 32, 37, 41, 43, 47, 71, 73, 101];
+ let mut a = a_ones.iter().cloned().collect::<FixedBitSet>();
+ let b = b_ones.iter().cloned().collect::<FixedBitSet>();
+ a |= b;
+ let res = a.ones().collect::<Vec<usize>>();
+ assert!(res == a_or_b);
+}
+
+#[test]
+fn bitor_assign_longer() {
+ let a_ones: Vec<usize> = vec![2, 7, 8, 11, 23, 31, 32];
+ let b_ones: Vec<usize> = vec![2, 3, 7, 19, 31, 32, 37, 41, 43, 47, 71, 73, 101];
+ let a_or_b: Vec<usize> = vec![2, 3, 7, 8, 11, 19, 23, 31, 32, 37, 41, 43, 47, 71, 73, 101];
+ let mut a = a_ones.iter().cloned().collect::<FixedBitSet>();
+ let b = b_ones.iter().cloned().collect::<FixedBitSet>();
+ a |= b;
+ let res = a.ones().collect::<Vec<usize>>();
+ assert!(res == a_or_b);
+}
+
+#[test]
+fn bitxor_assign_shorter() {
+ let a_ones: Vec<usize> = vec![2, 3, 7, 19, 31, 32, 37, 41, 43, 47, 71, 73, 101];
+ let b_ones: Vec<usize> = vec![2, 7, 8, 11, 23, 31, 32];
+ let a_xor_b: Vec<usize> = vec![3, 8, 11, 19, 23, 37, 41, 43, 47, 71, 73, 101];
+ let mut a = a_ones.iter().cloned().collect::<FixedBitSet>();
+ let b = b_ones.iter().cloned().collect::<FixedBitSet>();
+ a ^= b;
+ let res = a.ones().collect::<Vec<usize>>();
+ assert!(res == a_xor_b);
+}
+
+#[test]
+fn bitxor_assign_longer() {
+ let a_ones: Vec<usize> = vec![2, 7, 8, 11, 23, 31, 32];
+ let b_ones: Vec<usize> = vec![2, 3, 7, 19, 31, 32, 37, 41, 43, 47, 71, 73, 101];
+ let a_xor_b: Vec<usize> = vec![3, 8, 11, 19, 23, 37, 41, 43, 47, 71, 73, 101];
+ let mut a = a_ones.iter().cloned().collect::<FixedBitSet>();
+ let b = b_ones.iter().cloned().collect::<FixedBitSet>();
+ a ^= b;
+ let res = a.ones().collect::<Vec<usize>>();
+ assert!(res == a_xor_b);
+}
+
+#[test]
+fn subset_superset_shorter() {
+ let a_ones: Vec<usize> = vec![7, 31, 32, 63];
+ let b_ones: Vec<usize> = vec![2, 7, 19, 31, 32, 37, 41, 43, 47, 63, 73, 101];
+ let mut a = a_ones.iter().cloned().collect::<FixedBitSet>();
+ let b = b_ones.iter().cloned().collect::<FixedBitSet>();
+ assert!(a.is_subset(&b) && b.is_superset(&a));
+ a.insert(14);
+ assert!(!a.is_subset(&b) && !b.is_superset(&a));
+}
+
+#[test]
+fn subset_superset_longer() {
+ let a_len = 153;
+ let b_len = 75;
+ let a_ones: Vec<usize> = vec![7, 31, 32, 63];
+ let b_ones: Vec<usize> = vec![2, 7, 19, 31, 32, 37, 41, 43, 47, 63, 73];
+ let mut a = FixedBitSet::with_capacity(a_len);
+ let mut b = FixedBitSet::with_capacity(b_len);
+ a.extend(a_ones.iter().cloned());
+ b.extend(b_ones.iter().cloned());
+ assert!(a.is_subset(&b) && b.is_superset(&a));
+ a.insert(100);
+ assert!(!a.is_subset(&b) && !b.is_superset(&a));
+}
+
+#[test]
+fn is_disjoint_first_shorter() {
+ let a_len = 75;
+ let b_len = 153;
+ let a_ones: Vec<usize> = vec![2, 19, 32, 37, 41, 43, 47, 73];
+ let b_ones: Vec<usize> = vec![7, 23, 31, 63, 124];
+ let mut a = FixedBitSet::with_capacity(a_len);
+ let mut b = FixedBitSet::with_capacity(b_len);
+ a.extend(a_ones.iter().cloned());
+ b.extend(b_ones.iter().cloned());
+ assert!(a.is_disjoint(&b));
+ a.insert(63);
+ assert!(!a.is_disjoint(&b));
+}
+
+#[test]
+fn is_disjoint_first_longer() {
+ let a_ones: Vec<usize> = vec![2, 19, 32, 37, 41, 43, 47, 73, 101];
+ let b_ones: Vec<usize> = vec![7, 23, 31, 63];
+ let a = a_ones.iter().cloned().collect::<FixedBitSet>();
+ let mut b = b_ones.iter().cloned().collect::<FixedBitSet>();
+ assert!(a.is_disjoint(&b));
+ b.insert(2);
+ assert!(!a.is_disjoint(&b));
+}
+
+#[test]
+fn extend_on_empty() {
+ let items: Vec<usize> = vec![2, 3, 5, 7, 11, 13, 17, 19, 23, 27, 29, 31, 37, 167];
+ let mut fbs = FixedBitSet::with_capacity(0);
+ fbs.extend(items.iter().cloned());
+ let ones = fbs.ones().collect::<Vec<usize>>();
+ assert!(ones == items);
+}
+
+#[test]
+fn extend() {
+ let items: Vec<usize> = vec![2, 3, 5, 7, 11, 13, 17, 19, 23, 27, 29, 31, 37, 167];
+ let mut fbs = FixedBitSet::with_capacity(168);
+ let new: Vec<usize> = vec![7, 37, 67, 137];
+ for i in &new {
+ fbs.put(*i);
+ }
+
+ fbs.extend(items.iter().cloned());
+
+ let ones = fbs.ones().collect::<Vec<usize>>();
+ let expected = {
+ let mut tmp = items.clone();
+ tmp.extend(new);
+ tmp.sort();
+ tmp.dedup();
+ tmp
+ };
+
+ assert!(ones == expected);
+}
+
+#[test]
+fn from_iterator() {
+ let items: Vec<usize> = vec![0, 2, 4, 6, 8];
+ let fb = items.iter().cloned().collect::<FixedBitSet>();
+ for i in items {
+ assert!(fb.contains(i));
+ }
+ for i in vec![1, 3, 5, 7] {
+ assert!(!fb.contains(i));
+ }
+ assert_eq!(fb.len(), 9);
+}
+
+#[test]
+fn from_iterator_ones() {
+ let len = 257;
+ let mut fb = FixedBitSet::with_capacity(len);
+ for i in (0..len).filter(|i| i % 7 == 0) {
+ fb.put(i);
+ }
+ fb.put(len - 1);
+ let dup = fb.ones().collect::<FixedBitSet>();
+
+
+ assert_eq!(fb.len(), dup.len());
+ assert_eq!(fb.ones().collect::<Vec<usize>>(), dup.ones().collect::<Vec<usize>>());
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-21 19:45:34 +0000