Struct MultiFn 

pub struct MultiFn {
    pub name: Arc<str>,
    pub dispatch_fn: Value,
    pub methods: Mutex<HashMap<String, Value>>,
    pub dispatch_vals: Mutex<HashMap<String, Value>>,
    pub prefers: Mutex<HashMap<String, Vec<String>>>,
    pub preference_vals: Mutex<HashMap<String, Value>>,
    pub default_dispatch: String,
    /* private fields */
}

A Clojure multimethod — arbitrary dispatch via a user-supplied function.

Fields

name: Arc<str>

dispatch_fn: Value

methods: Mutex<HashMap<String, Value>>

pr_str(dispatch-val) → implementation fn

dispatch_vals: Mutex<HashMap<String, Value>>

pr_str(dispatch-val) → the dispatch value itself, for isa? lookups

prefers: Mutex<HashMap<String, Vec<String>>>

recorded preferences: pr_str(preferred) → pr_str(over)

preference_vals: Mutex<HashMap<String, Value>>

pr_str(preference dispatch value) → original value, including values which do not currently have a method.

default_dispatch: String

normally “:default”

Implementations

impl MultiFn

pub fn new(name: Arc<str>, dispatch_fn: Value, default_dispatch: String) -> Self

pub fn method_generation(&self) -> u64

Current generation of this multimethod’s method and preference tables.

pub fn bump_method_generation(&self)

Invalidate this multimethod’s cached inherited/default resolutions.

pub fn cached_method( &self, dispatch_key: &str, hierarchy_generation: u64, method_generation: u64, ) -> Option<String>

Return a cached resolved method key when both source generations match. Observing either new generation lazily discards stale entries at once.

pub fn cache_method( &self, dispatch_key: String, method_key: String, hierarchy_generation: u64, method_generation: u64, )

Cache dispatch_key -> method_key under the source generations used to resolve it. A concurrent mutation makes the entry stale, so the next lookup discards it; the write itself never needs to be suppressed.

pub fn cached_method_count(&self) -> usize

Number of entries in the current cache, exposed for regression tests.

Trait Implementations

impl Debug for MultiFn

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

Formats the value using the given formatter.

impl Trace for MultiFn

fn trace(&self, visitor: &mut MarkVisitor)

fn gc_size_extra(&self) -> usize