Struct BooleanPredicate

pub struct BooleanPredicate { /* private fields */ }

Predicate that always returns a constant (boolean) result.

This is created by the predicate::always and predicate::never functions.

Trait Implementations

impl Clone for BooleanPredicate

fn clone(&self) -> BooleanPredicate

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for BooleanPredicate

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

Formats the value using the given formatter.

impl Display for BooleanPredicate

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

Formats the value using the given formatter.

impl PartialEq for BooleanPredicate

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<Item: ?Sized> Predicate<Item> for BooleanPredicate

fn eval(&self, _variable: &Item) -> bool

Execute this Predicate against variable, returning the resulting boolean.

fn find_case<'a>(&'a self, expected: bool, variable: &Item) -> Option<Case<'a>>

Find a case that proves this predicate as expected when run against variable.

impl PredicateReflection for BooleanPredicate

fn parameters<'a>(&'a self) -> Box<dyn Iterator<Item = Parameter<'a>> + 'a>

Parameters of the current Predicate.

fn children<'a>(&'a self) -> Box<dyn Iterator<Item = Child<'a>> + 'a>

Nested Predicates of the current Predicate.

impl Copy for BooleanPredicate

impl Eq for BooleanPredicate

impl StructuralPartialEq for BooleanPredicate