Enum CacheProbe 

pub enum CacheProbe {
    NotCached,
    Hit(Vec<u8>),
    Miss(CacheSlot),
}

v2.89.0 — what a pre-dispatch probe found.

The three arms are the three different things a caller must do, which is why this is not an Option<Vec<u8>>: “nothing memoises this call” and “memoised, but absent” look identical to an Option and are not the same fact — the first stores nothing afterwards, the second must.

Variants

NotCached

No policy governs this call. Dispatch normally; store nothing.

Hit(Vec<u8>)

A memoised value. Do not dispatch, and do not charge a budget — that ordering is the design decision, and it is the caller’s to honour.

Miss(CacheSlot)

Memoised but absent. Dispatch, then hand the value to CacheRuntime::store with this slot.

Trait Implementations

impl Clone for CacheProbe

fn clone(&self) -> CacheProbe

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CacheProbe

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

Formats the value using the given formatter.

impl Eq for CacheProbe

impl PartialEq for CacheProbe

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for CacheProbe