Struct bit_vec::BitVec[][src]

pub struct BitVec<B = u32> { /* fields omitted */ }
Expand description

The bitvector type.

Examples

use bit_vec::BitVec;

let mut bv = BitVec::from_elem(10, false);

// insert all primes less than 10
bv.set(2, true);
bv.set(3, true);
bv.set(5, true);
bv.set(7, true);
println!("{:?}", bv);
println!("total bits set to true: {}", bv.iter().filter(|x| *x).count());

// flip all values in bitvector, producing non-primes less than 10
bv.negate();
println!("{:?}", bv);
println!("total bits set to true: {}", bv.iter().filter(|x| *x).count());

// reset bitvector to empty
bv.clear();
println!("{:?}", bv);
println!("total bits set to true: {}", bv.iter().filter(|x| *x).count());

Implementations

Creates an empty BitVec.

Examples
use bit_vec::BitVec;
let mut bv = BitVec::new();

Creates a BitVec that holds nbits elements, setting each element to bit.

Examples
use bit_vec::BitVec;

let mut bv = BitVec::from_elem(10, false);
assert_eq!(bv.len(), 10);
for x in bv.iter() {
    assert_eq!(x, false);
}

Constructs a new, empty BitVec with the specified capacity.

The bitvector will be able to hold at least capacity bits without reallocating. If capacity is 0, it will not allocate.

It is important to note that this function does not specify the length of the returned bitvector, but only the capacity.

Transforms a byte-vector into a BitVec. Each byte becomes eight bits, with the most significant bits of each byte coming first. Each bit becomes true if equal to 1 or false if equal to 0.

Examples
use bit_vec::BitVec;

let bv = BitVec::from_bytes(&[0b10100000, 0b00010010]);
assert!(bv.eq_vec(&[true, false, true, false,
                    false, false, false, false,
                    false, false, false, true,
                    false, false, true, false]));

Creates a BitVec of the specified length where the value at each index is f(index).

Examples
use bit_vec::BitVec;

let bv = BitVec::from_fn(5, |i| { i % 2 == 0 });
assert!(bv.eq_vec(&[true, false, true, false, true]));

Iterator over the underlying blocks of data

Exposes the raw block storage of this BitVec

Only really intended for BitSet.

Exposes the raw block storage of this BitVec

Can probably cause unsafety. Only really intended for BitSet.

Retrieves the value at index i, or None if the index is out of bounds.

Examples
use bit_vec::BitVec;

let bv = BitVec::from_bytes(&[0b01100000]);
assert_eq!(bv.get(0), Some(false));
assert_eq!(bv.get(1), Some(true));
assert_eq!(bv.get(100), None);

// Can also use array indexing
assert_eq!(bv[1], true);

Sets the value of a bit at an index i.

Panics

Panics if i is out of bounds.

Examples
use bit_vec::BitVec;

let mut bv = BitVec::from_elem(5, false);
bv.set(3, true);
assert_eq!(bv[3], true);

Sets all bits to 1.

Examples
use bit_vec::BitVec;

let before = 0b01100000;
let after  = 0b11111111;

let mut bv = BitVec::from_bytes(&[before]);
bv.set_all();
assert_eq!(bv, BitVec::from_bytes(&[after]));

Flips all bits.

Examples
use bit_vec::BitVec;

let before = 0b01100000;
let after  = 0b10011111;

let mut bv = BitVec::from_bytes(&[before]);
bv.negate();
assert_eq!(bv, BitVec::from_bytes(&[after]));
👎 Deprecated since 0.7.0:

Please use the ‘or’ function instead

Calculates the union of two bitvectors. This acts like the bitwise or function.

Sets self to the union of self and other. Both bitvectors must be the same length. Returns true if self changed.

Panics

Panics if the bitvectors are of different lengths.

Examples
use bit_vec::BitVec;

let a   = 0b01100100;
let b   = 0b01011010;
let res = 0b01111110;

let mut a = BitVec::from_bytes(&[a]);
let b = BitVec::from_bytes(&[b]);

assert!(a.union(&b));
assert_eq!(a, BitVec::from_bytes(&[res]));
👎 Deprecated since 0.7.0:

Please use the ‘and’ function instead

Calculates the intersection of two bitvectors. This acts like the bitwise and function.

Sets self to the intersection of self and other. Both bitvectors must be the same length. Returns true if self changed.

Panics

Panics if the bitvectors are of different lengths.

Examples
use bit_vec::BitVec;

let a   = 0b01100100;
let b   = 0b01011010;
let res = 0b01000000;

let mut a = BitVec::from_bytes(&[a]);
let b = BitVec::from_bytes(&[b]);

assert!(a.intersect(&b));
assert_eq!(a, BitVec::from_bytes(&[res]));

Calculates the bitwise or of two bitvectors.

Sets self to the union of self and other. Both bitvectors must be the same length. Returns true if self changed.

Panics

Panics if the bitvectors are of different lengths.

Examples
use bit_vec::BitVec;

let a   = 0b01100100;
let b   = 0b01011010;
let res = 0b01111110;

let mut a = BitVec::from_bytes(&[a]);
let b = BitVec::from_bytes(&[b]);

assert!(a.or(&b));
assert_eq!(a, BitVec::from_bytes(&[res]));

Calculates the bitwise and of two bitvectors.

Sets self to the intersection of self and other. Both bitvectors must be the same length. Returns true if self changed.

Panics

Panics if the bitvectors are of different lengths.

Examples
use bit_vec::BitVec;

let a   = 0b01100100;
let b   = 0b01011010;
let res = 0b01000000;

let mut a = BitVec::from_bytes(&[a]);
let b = BitVec::from_bytes(&[b]);

assert!(a.and(&b));
assert_eq!(a, BitVec::from_bytes(&[res]));

Calculates the difference between two bitvectors.

Sets each element of self to the value of that element minus the element of other at the same index. Both bitvectors must be the same length. Returns true if self changed.

Panics

Panics if the bitvectors are of different length.

Examples
use bit_vec::BitVec;

let a   = 0b01100100;
let b   = 0b01011010;
let a_b = 0b00100100; // a - b
let b_a = 0b00011010; // b - a

let mut bva = BitVec::from_bytes(&[a]);
let bvb = BitVec::from_bytes(&[b]);

assert!(bva.difference(&bvb));
assert_eq!(bva, BitVec::from_bytes(&[a_b]));

let bva = BitVec::from_bytes(&[a]);
let mut bvb = BitVec::from_bytes(&[b]);

assert!(bvb.difference(&bva));
assert_eq!(bvb, BitVec::from_bytes(&[b_a]));

Calculates the xor of two bitvectors.

Sets self to the xor of self and other. Both bitvectors must be the same length. Returns true if self changed.

Panics

Panics if the bitvectors are of different length.

Examples
use bit_vec::BitVec;

let a   = 0b01100110;
let b   = 0b01010100;
let res = 0b00110010;

let mut a = BitVec::from_bytes(&[a]);
let b = BitVec::from_bytes(&[b]);

assert!(a.xor(&b));
assert_eq!(a, BitVec::from_bytes(&[res]));

Calculates the nand of two bitvectors.

Sets self to the nand of self and other. Both bitvectors must be the same length. Returns true if self changed.

Panics

Panics if the bitvectors are of different length.

Examples
use bit_vec::BitVec;

let a   = 0b01100110;
let b   = 0b01010100;
let res = 0b10111011;

let mut a = BitVec::from_bytes(&[a]);
let b = BitVec::from_bytes(&[b]);

assert!(a.nand(&b));
assert_eq!(a, BitVec::from_bytes(&[res]));

Calculates the nor of two bitvectors.

Sets self to the nor of self and other. Both bitvectors must be the same length. Returns true if self changed.

Panics

Panics if the bitvectors are of different length.

Examples
use bit_vec::BitVec;

let a   = 0b01100110;
let b   = 0b01010100;
let res = 0b10001001;

let mut a = BitVec::from_bytes(&[a]);
let b = BitVec::from_bytes(&[b]);

assert!(a.nor(&b));
assert_eq!(a, BitVec::from_bytes(&[res]));

Calculates the xnor of two bitvectors.

Sets self to the xnor of self and other. Both bitvectors must be the same length. Returns true if self changed.

Panics

Panics if the bitvectors are of different length.

Examples
use bit_vec::BitVec;

let a   = 0b01100110;
let b   = 0b01010100;
let res = 0b11001101;

let mut a = BitVec::from_bytes(&[a]);
let b = BitVec::from_bytes(&[b]);

assert!(a.xnor(&b));
assert_eq!(a, BitVec::from_bytes(&[res]));

Returns true if all bits are 1.

Examples
use bit_vec::BitVec;

let mut bv = BitVec::from_elem(5, true);
assert_eq!(bv.all(), true);

bv.set(1, false);
assert_eq!(bv.all(), false);

Returns an iterator over the elements of the vector in order.

Examples
use bit_vec::BitVec;

let bv = BitVec::from_bytes(&[0b01110100, 0b10010010]);
assert_eq!(bv.iter().filter(|x| *x).count(), 7);

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

Examples
use bit_vec::BitVec;

let mut a = BitVec::from_bytes(&[0b10000000]);
let mut b = BitVec::from_bytes(&[0b01100001]);

a.append(&mut b);

assert_eq!(a.len(), 16);
assert_eq!(b.len(), 0);
assert!(a.eq_vec(&[true, false, false, false, false, false, false, false,
                   false, true, true, false, false, false, false, true]));

Splits the BitVec into two at the given bit, retaining the first half in-place and returning the second one.

Panics

Panics if at is out of bounds.

Examples
use bit_vec::BitVec;
let mut a = BitVec::new();
a.push(true);
a.push(false);
a.push(false);
a.push(true);

let b = a.split_off(2);

assert_eq!(a.len(), 2);
assert_eq!(b.len(), 2);
assert!(a.eq_vec(&[true, false]));
assert!(b.eq_vec(&[false, true]));

Returns true if all bits are 0.

Examples
use bit_vec::BitVec;

let mut bv = BitVec::from_elem(10, false);
assert_eq!(bv.none(), true);

bv.set(3, true);
assert_eq!(bv.none(), false);

Returns true if any bit is 1.

Examples
use bit_vec::BitVec;

let mut bv = BitVec::from_elem(10, false);
assert_eq!(bv.any(), false);

bv.set(3, true);
assert_eq!(bv.any(), true);

Organises the bits into bytes, such that the first bit in the BitVec becomes the high-order bit of the first byte. If the size of the BitVec is not a multiple of eight then trailing bits will be filled-in with false.

Examples
use bit_vec::BitVec;

let mut bv = BitVec::from_elem(3, true);
bv.set(1, false);

assert_eq!(bv.to_bytes(), [0b10100000]);

let mut bv = BitVec::from_elem(9, false);
bv.set(2, true);
bv.set(8, true);

assert_eq!(bv.to_bytes(), [0b00100000, 0b10000000]);

Compares a BitVec to a slice of bools. Both the BitVec and slice must have the same length.

Panics

Panics if the BitVec and slice are of different length.

Examples
use bit_vec::BitVec;

let bv = BitVec::from_bytes(&[0b10100000]);

assert!(bv.eq_vec(&[true, false, true, false,
                    false, false, false, false]));

Shortens a BitVec, dropping excess elements.

If len is greater than the vector’s current length, this has no effect.

Examples
use bit_vec::BitVec;

let mut bv = BitVec::from_bytes(&[0b01001011]);
bv.truncate(2);
assert!(bv.eq_vec(&[false, true]));

Reserves capacity for at least additional more bits to be inserted in the given BitVec. The collection may reserve more space to avoid frequent reallocations.

Panics

Panics if the new capacity overflows usize.

Examples
use bit_vec::BitVec;

let mut bv = BitVec::from_elem(3, false);
bv.reserve(10);
assert_eq!(bv.len(), 3);
assert!(bv.capacity() >= 13);

Reserves the minimum capacity for exactly additional more bits to be inserted in the given BitVec. Does nothing if the capacity is already sufficient.

Note that the allocator may give the collection more space than it requests. Therefore capacity can not be relied upon to be precisely minimal. Prefer reserve if future insertions are expected.

Panics

Panics if the new capacity overflows usize.

Examples
use bit_vec::BitVec;

let mut bv = BitVec::from_elem(3, false);
bv.reserve(10);
assert_eq!(bv.len(), 3);
assert!(bv.capacity() >= 13);

Returns the capacity in bits for this bit vector. Inserting any element less than this amount will not trigger a resizing.

Examples
use bit_vec::BitVec;

let mut bv = BitVec::new();
bv.reserve(10);
assert!(bv.capacity() >= 10);

Grows the BitVec in-place, adding n copies of value to the BitVec.

Panics

Panics if the new len overflows a usize.

Examples
use bit_vec::BitVec;

let mut bv = BitVec::from_bytes(&[0b01001011]);
bv.grow(2, true);
assert_eq!(bv.len(), 10);
assert_eq!(bv.to_bytes(), [0b01001011, 0b11000000]);

Removes the last bit from the BitVec, and returns it. Returns None if the BitVec is empty.

Examples
use bit_vec::BitVec;

let mut bv = BitVec::from_bytes(&[0b01001001]);
assert_eq!(bv.pop(), Some(true));
assert_eq!(bv.pop(), Some(false));
assert_eq!(bv.len(), 6);

Pushes a bool onto the end.

Examples
use bit_vec::BitVec;

let mut bv = BitVec::new();
bv.push(true);
bv.push(false);
assert!(bv.eq_vec(&[true, false]));

Returns the total number of bits in this vector

Sets the number of bits that this BitVec considers initialized.

Almost certainly can cause bad stuff. Only really intended for BitSet.

Returns true if there are no bits in this vector

Clears all bits in this vector.

Shrinks the capacity of the underlying storage as much as possible.

It will drop down as close as possible to the length but the allocator may still inform the underlying storage that there is space for a few more elements/bits.

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Returns the “default value” for a type. Read more

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

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

Extends a collection with exactly one element.

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

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

Creates a value from an iterator. Read more

Feeds this value into the given Hasher. Read more

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

The returned type after indexing.

Performs the indexing (container[index]) operation. Read more

The type of the elements being iterated over.

Which kind of iterator are we turning this into?

Creates an iterator from a value. Read more

The type of the elements being iterated over.

Which kind of iterator are we turning this into?

Creates an iterator from a value. Read more

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

Compares and returns the maximum of two values. Read more

Compares and returns the minimum of two values. Read more

Restrict a value to a certain interval. Read more

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

This method tests for !=.

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

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

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

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

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

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

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

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.