Struct FilterPredicate 

pub struct FilterPredicate(pub Arc<dyn Fn(&Exchange) -> bool + Send + Sync>);

Predicate that determines whether an exchange passes the filter. Returns true to forward the exchange into the filter body; false to skip it.

This is a newtype around Arc<dyn Fn(&Exchange) -> bool + Send + Sync> so that it can implement Debug (used by #[derive(Debug)] on BuilderStep and friends). The Deref impl keeps the call-site ergonomic: predicate(&exchange) still works because FilterPredicate derefs to the inner dyn Fn.

Pre-v1.0: this used to be a type alias. Converted to a newtype (H2) so the containing structs (WhenStep, etc.) can be #[derive(Debug)].

Tuple Fields

0: Arc<dyn Fn(&Exchange) -> bool + Send + Sync>

Implementations

impl FilterPredicate

pub fn new<F>(f: F) -> Self

where F: Fn(&Exchange) -> bool + Send + Sync + 'static,

Create a new FilterPredicate from a closure or function pointer.

Trait Implementations

impl Clone for FilterPredicate

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FilterPredicate

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

Formats the value using the given formatter.

impl Deref for FilterPredicate

type Target = dyn Fn(&Exchange) -> bool + Sync + Send

The resulting type after dereferencing.

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

Dereferences the value.