Struct egui::cache::cache_storage::CacheStorage

pub struct CacheStorage {
    caches: HashMap<TypeId, Box<dyn CacheTrait>>,
}

A typemap of many caches, all implemented with CacheTrait.

You can access egui’s caches via crate::Memory::caches, found with crate::Context::memory_mut.

use egui::cache::{CacheStorage, ComputerMut, FrameCache};

#[derive(Default)]
struct CharCounter {}
impl ComputerMut<&str, usize> for CharCounter {
    fn compute(&mut self, s: &str) -> usize {
        s.chars().count()
    }
}
type CharCountCache<'a> = FrameCache<usize, CharCounter>;

let mut cache = cache_storage.cache::<CharCountCache<'_>>();
assert_eq!(cache.get("hello"), 5);

Fields

caches: HashMap<TypeId, Box<dyn CacheTrait>>

Implementations

impl CacheStorage

pub fn cache<Cache: CacheTrait + Default>(&mut self) -> &mut Cache

fn num_values(&self) -> usize

Total number of cached values

pub fn update(&mut self)

Call once per frame to evict cache.

Trait Implementations

impl Clone for CacheStorage

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for CacheStorage

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

Formats the value using the given formatter.

impl Default for CacheStorage

fn default() -> CacheStorage

Returns the “default value” for a type.