Struct Handler 

pub struct Handler { /* private fields */ }

A registered step handler: a closure over (state, args_after_state).

Implementations

impl Handler

pub fn noop() -> Handler

A no-op handler (arity-agnostic) — used where a handler is never invoked.

pub fn new( f: impl Fn(Rc<dyn Any>, Vec<Value>) -> HandlerReturn + 'static, ) -> Handler

Builds a handler from a raw closure over the opaque state and the slot arguments. The facade’s typed stimulus/sensor build these; authors use those instead.

pub fn sync0( f: impl Fn(Value) -> Result<Option<Value>, HandlerError> + 'static, ) -> Handler

Fixed-arity conveniences over a Value state. These exist for the core’s own tests and for any consumer not using the varar facade — the facade builds handlers from typed closures instead, so an author never calls these.

pub fn sync1( f: impl Fn(Value, Value) -> Result<Option<Value>, HandlerError> + 'static, ) -> Handler

A synchronous 1-argument handler (state, a).

pub fn sync2( f: impl Fn(Value, Value, Value) -> Result<Option<Value>, HandlerError> + 'static, ) -> Handler

A synchronous 2-argument handler (state, a, b).

pub fn state1( f: impl Fn(Value, Value) -> Result<Value, HandlerError> + 'static, ) -> Handler

As Handler::sync1, but its result is the next state rather than a value to compare.

pub fn async0( f: impl Fn(Value) -> Pin<Box<dyn Future<Output = HandlerReturn>>> + 'static, ) -> Handler

An asynchronous 0-argument handler returning a Future.

pub fn sync_var( f: impl Fn(Value, Vec<Value>) -> Result<Option<Value>, HandlerError> + 'static, ) -> Handler

A synchronous handler of any arity: (state, args).

pub fn async_var( f: impl Fn(Value, Vec<Value>) -> Pin<Box<dyn Future<Output = HandlerReturn>>> + 'static, ) -> Handler

As Handler::sync_var, returning a Future.

Trait Implementations

impl Clone for Handler

fn clone(&self) -> Handler

Returns a duplicate of the value.

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

Performs copy-assignment from source.