Enum RecordSize 

#[non_exhaustive]
pub enum RecordSize {
    Bits24,
    Bits28,
    Bits32,
}

Width, in bits, of a single child record inside a search-tree node.

Each node holds two records (a left and a right child). Wider records address larger trees at the cost of bytes on disk. The MMDB format defines exactly these three widths; any other width produces a file no reader will accept, so it is modeled as an enum rather than a raw integer.

A Writer picks the smallest size that fits by default — see WriterBuilder::record_size to pin one explicitly.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Bits24

24-bit records, 6-byte nodes. Capacity: ~16.7 million nodes.

Bits28

28-bit records, 7-byte nodes. Capacity: ~268 million nodes. Default.

Bits32

32-bit records, 8-byte nodes. Capacity: ~4.3 billion nodes.

Implementations

impl RecordSize

pub const fn bits(self) -> u8

Width of the record in bits (24, 28, or 32).

pub const fn node_bytes(self) -> usize

Number of bytes a single tree node (two records) occupies on disk.

pub const fn max_value(self) -> u64

Maximum addressable record value, exclusive. Values at or above this limit cannot be encoded and are caught before serialization.

pub const fn as_metadata(self) -> u16

Width encoded as a u16 for the metadata section’s record_size field.

Trait Implementations

impl Clone for RecordSize

fn clone(&self) -> RecordSize

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for RecordSize

impl Debug for RecordSize

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

Formats the value using the given formatter.

impl Default for RecordSize

fn default() -> RecordSize

Returns the “default value” for a type.

impl Eq for RecordSize

impl Hash for RecordSize

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for RecordSize

fn eq(&self, other: &RecordSize) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for RecordSize