Struct BoxStatefulPredicate 

pub struct BoxStatefulPredicate<T> { /* private fields */ }

A Box-based stateful predicate with single ownership.

This type stores a Box<dyn FnMut(&T) -> bool>, so each call may update the predicate’s internal state. Composition methods consume self, matching the single-ownership model.

Implementations

impl<T> BoxStatefulPredicate<T>

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

where F: FnMut(&T) -> bool + 'static,

Creates a new predicate.

Wraps the provided closure in the appropriate smart pointer type for this predicate implementation.

pub fn new_with_name<F>(name: &str, f: F) -> Self

where F: FnMut(&T) -> bool + 'static,

Creates a new named predicate.

Wraps the provided closure and assigns it a name, which is useful for debugging and logging purposes.

pub fn new_with_optional_name<F>(f: F, name: Option<String>) -> Self

where F: FnMut(&T) -> bool + 'static,

Creates a new named predicate with an optional name.

Wraps the provided closure and assigns it an optional name.

pub fn name(&self) -> Option<&str>

Gets the name of this predicate.

Returns

Returns Some(&str) if a name was set, None otherwise.

pub fn set_name(&mut self, name: &str)

Sets the name of this predicate.

Parameters

• name - The name to set for this predicate

pub fn clear_name(&mut self)

Clears the name of this predicate.

pub fn always_true() -> Self

Creates a predicate that always returns true.

Returns

A new BoxStatefulPredicate that always returns true.

pub fn always_false() -> Self

Creates a predicate that always returns false.

Returns

A new BoxStatefulPredicate that always returns false.

pub fn and<P>(self, other: P) -> BoxStatefulPredicate<T>

where P: StatefulPredicate<T> + 'static, T: 'static,

Returns a predicate representing logical AND with another predicate.

This method consumes self and evaluates other only when this predicate returns true.

Parameters

• other - The other predicate to combine with.

Returns

A new BoxStatefulPredicate representing logical AND.

pub fn or<P>(self, other: P) -> BoxStatefulPredicate<T>

where P: StatefulPredicate<T> + 'static, T: 'static,

Returns a predicate representing logical OR with another predicate.

This method consumes self and evaluates other only when this predicate returns false.

Parameters

• other - The other predicate to combine with.

Returns

A new BoxStatefulPredicate representing logical OR.

pub fn nand<P>(self, other: P) -> BoxStatefulPredicate<T>

where P: StatefulPredicate<T> + 'static, T: 'static,

Returns a predicate representing logical NAND with another predicate.

NAND returns true unless both predicates return true.

Parameters

• other - The other predicate to combine with.

Returns

A new BoxStatefulPredicate representing logical NAND.

pub fn xor<P>(self, other: P) -> BoxStatefulPredicate<T>

where P: StatefulPredicate<T> + 'static, T: 'static,

Returns a predicate representing logical XOR with another predicate.

XOR evaluates both predicates and returns true when exactly one predicate returns true.

Parameters

• other - The other predicate to combine with.

Returns

A new BoxStatefulPredicate representing logical XOR.

pub fn nor<P>(self, other: P) -> BoxStatefulPredicate<T>

where P: StatefulPredicate<T> + 'static, T: 'static,

Returns a predicate representing logical NOR with another predicate.

NOR returns true only when both predicates return false.

Parameters

• other - The other predicate to combine with.

Returns

A new BoxStatefulPredicate representing logical NOR.

Trait Implementations

impl<T> Debug for BoxStatefulPredicate<T>

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

Formats the value using the given formatter.

impl<T> Display for BoxStatefulPredicate<T>

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

Formats the value using the given formatter.

impl<T> Not for BoxStatefulPredicate<T>

where T: 'static,

type Output = BoxStatefulPredicate<T>

The resulting type after applying the ! operator.

fn not(self) -> Self::Output

Performs the unary ! operation.

impl<T> StatefulPredicate<T> for BoxStatefulPredicate<T>

fn test(&mut self, value: &T) -> bool

Tests whether the given value satisfies this predicate.

fn into_box(self) -> BoxStatefulPredicate<T>

Converts this predicate into a BoxStatefulPredicate.

fn into_rc(self) -> RcStatefulPredicate<T>

where Self: 'static,

Converts this predicate into an RcStatefulPredicate.

fn into_fn(self) -> impl FnMut(&T) -> bool

Converts this predicate into a closure implementing FnMut(&T) -> bool.

fn into_arc(self) -> ArcStatefulPredicate<T>

where Self: Sized + Send + 'static,

Converts this predicate into an ArcStatefulPredicate.