Struct Current 

pub struct Current(/* private fields */);

An event as the current shape: read through the upcaster chain.

The proof that a fold is looking at today’s shape, carried in the type. A backend hands back what it stored, under whatever version it was written with; only CurrentStore turns those into Currents, because Current::from_upcasted is private to this module. Every kernel fold takes &[Current], so a read that skipped the seam cannot be handed to one — the call does not compile.

It derefs to the event’s object, so a fold reads fields exactly as it did when it was handed a plain map; Current::into_inner gives that map up for a caller that has to own it (the Lua bridge, building tables).

Implementations

impl Current

pub fn kind(&self) -> &str

The kind of the event (empty when absent).

pub fn seq(&self) -> u64

The store-assigned seq of the event (0 when absent).

pub fn into_inner(self) -> Map<String, Value>

Give up the event’s object — for a caller that has to own it.

Methods from Deref<Target = Map<String, Value>>

pub fn get<Q>(&self, key: &Q) -> Option<&Value>

where String: Borrow<Q>, Q: Ord + Eq + Hash + ?Sized,

Returns a reference to the value corresponding to the key.

The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.

pub fn contains_key<Q>(&self, key: &Q) -> bool

where String: Borrow<Q>, Q: Ord + Eq + Hash + ?Sized,

Returns true if the map contains a value for the specified key.

The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.

pub fn get_key_value<Q>(&self, key: &Q) -> Option<(&String, &Value)>

where String: Borrow<Q>, Q: Ord + Eq + Hash + ?Sized,

Returns the key-value pair matching the given key.

The key may be any borrowed form of the map’s key type, but the ordering on the borrowed form must match the ordering on the key type.

pub fn len(&self) -> usize

Returns the number of elements in the map.

pub fn is_empty(&self) -> bool

Returns true if the map contains no elements.

pub fn iter(&self) -> Iter<'_>

Gets an iterator over the entries of the map.

pub fn keys(&self) -> Keys<'_>

Gets an iterator over the keys of the map.

pub fn values(&self) -> Values<'_>

Gets an iterator over the values of the map.

Trait Implementations

impl Clone for Current

fn clone(&self) -> Current

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Current

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

Formats the value using the given formatter.

impl Deref for Current

type Target = Map<String, Value>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl Display for Current

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

The event as JSON — what a failure message about an event wants to show. An object that will not serialise falls back to its debug form rather than failing the formatter: this runs while something is already being reported.

impl Eq for Current

impl PartialEq for Current

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Current