Struct ShapingCache 

pub struct ShapingCache { /* private fields */ }

LRU cache mapping CacheKey → ShapedText.

Capacity is the maximum number of entries held in memory. When capacity is exceeded the least-recently-used entry is evicted.

Implementations

impl ShapingCache

pub fn new(capacity: usize) -> Self

Create a new cache with the given maximum capacity.

A capacity of 0 is treated as effectively disabled (every lookup is a miss and nothing is stored).

pub fn get(&mut self, key: &CacheKey) -> Option<&ShapedText>

Look up key and return a reference to the cached ShapedText if present.

On a hit the key is promoted to the front (most-recently-used) position.

pub fn insert(&mut self, key: CacheKey, value: ShapedText)

Insert a value for key.

If the cache is at capacity the least-recently-used entry is evicted first. If capacity == 0 the entry is never stored.

pub fn hit_rate(&self) -> f64

Return the cache hit rate as hits / (hits + misses), or 0.0 when no lookups have been performed.

pub fn stats(&self) -> (u64, u64, u64)

Return (hits, misses, evictions).

pub fn clear(&mut self)

Clear all entries and reset statistics.

pub fn len(&self) -> usize

Return the number of entries currently in the cache.

pub fn is_empty(&self) -> bool

Returns true when the cache is empty.