| //! `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>>()); |
| } |
