Struct DedupeEncoder 

pub struct DedupeEncoder { /* private fields */ }

Stateful encoder that replaces repeated values with compact IDs.

Implementations

impl DedupeEncoder

pub fn new() -> Self

Creates a new empty DedupeEncoder.

pub fn with_capacity(initial_capacity: usize, num_types: usize) -> Self

Creates a new DedupeEncoder with the specified capacity.

The encoder will be able to hold at least capacity unique values and num_types categories of types without reallocating.

pub fn clear(&mut self)

Removes all cached entries and resets assigned IDs.

pub const fn len(&self) -> usize

Returns the number of unique values currently stored in the encoder (seen so far).

pub const fn is_empty(&self) -> bool

Returns true if no values have been seen yet.

pub fn encode<T: Hash + Eq + Pack + Clone + Send + Sync + 'static>( &mut self, val: &T, writer: &mut impl Write, ) -> Result<usize>

Encodes a value with deduplication.

If the value has been seen before, only its ID is encoded. Otherwise, the value is encoded in full, preceded by a special ID (0).

Arguments

• val - The value to encode. It must implement Hash, Eq, and Pack.
• writer - The writer to which the encoded data will be written.

Returns

The number of bytes written to the writer. Encodes val with deduplication support.

When the value is first seen, this writes a special ID 0 followed by the packed value. On subsequent occurrences, only the assigned ID is written.

Trait Implementations

impl Default for DedupeEncoder

fn default() -> Self

Returns the “default value” for a type.