Struct bio::data_structures::rank_select::RankSelect

pub struct RankSelect { /* private fields */ }

A rank/select data structure.

Implementations

impl RankSelect

pub fn new(bits: BitVec<u8>, k: usize) -> RankSelect

Create a new instance.

Arguments

• bits - A bit vector.
• k - Determines the size (k * 32 bits) of the superblocks. A small k means faster rank query times at the expense of using more space and slower select query times. The data structure needs O(n + n log n / (k * 32)) bits with n being the bits of the given bitvector. The data structure is succinct if k is chosen as a sublinear function of n (e.g. k = (log n)² / 32).

pub fn k(&self) -> usize

Return the used k (see RankSelect::new()).

pub fn bits(&self) -> &BitVec<u8>

Get internal representation of bit vector.

pub fn get(&self, i: u64) -> bool

Return i-th bit.

pub fn rank_1(&self, i: u64) -> Option<u64>

Get the 1-rank of a given bit, i.e. the number of 1-bits in the bitvector up to i (inclusive). Complexity: O(k).

Arguments

• i - Position of the bit to determine the rank for.

pub fn rank_0(&self, i: u64) -> Option<u64>

Get the 0-rank of a given bit, i.e. the number of 0-bits in the bitvector up to i (inclusive). Complexity: O(k).

Arguments

• i - Position of the bit to determine the rank for.

pub fn rank(&self, i: u64) -> Option<u64>

Alias for RankSelect::rank_1.

pub fn select_1(&self, j: u64) -> Option<u64>

Get the smallest bit with a given 1-rank. Complexity: O(log (n / k) + k).

Arguments

• j - The rank to find the smallest bit for.

pub fn select_0(&self, j: u64) -> Option<u64>

Get the smallest bit with a given 0-rank. Complexity: O(log (n / k) + k).

Arguments

• j - The rank to find the smallest bit for.

pub fn select(&self, j: u64) -> Option<u64>

Alias for RankSelect::select_1.

Trait Implementations

impl<'de> Deserialize<'de> for RankSelect

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where
    __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for RankSelect

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>where
    __S: Serializer,

Serialize this value into the given Serde serializer.