Struct Bitmask 

pub struct Bitmask {
    pub len: usize,
    /* private fields */
}

One bit per row, recording which entries of a numeric ColumnData hold a value rather than a blank.

A set bit means the value at that index is real; a clear bit means the cell is empty and the underlying slot holds a placeholder. Keeping this separate is what lets a numeric column stay unboxed and still tell a blank cell apart from a zero.

Read-only from outside the crate – the mutators are crate-private, since changing a mask’s length independently of the column it belongs to would desync the two.

Fields

len: usize

How many bits are in use, which is the row count of the column this mask belongs to. Not the capacity of the backing bytes.

Implementations

impl Bitmask

pub fn get(&self, index: usize) -> bool

Whether the entry at index holds a value. false for an index at or past Bitmask::len, so an out-of-range read is indistinguishable from a blank.

Trait Implementations

impl Clone for Bitmask

fn clone(&self) -> Bitmask

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Bitmask

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Bitmask

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Bitmask

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

where __S: Serializer,

Serialize this value into the given Serde serializer.