Struct predicates::constant::BooleanPredicate

pub struct BooleanPredicate<Item> { /* fields omitted */ }

Predicate that always returns a constant (boolean) result.

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

Trait Implementations

impl<Item: Debug> Debug for BooleanPredicate<Item>

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

Formats the value using the given formatter.

impl<Item: Clone> Clone for BooleanPredicate<Item>

fn clone(&self) -> BooleanPredicate<Item>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<Item: Copy> Copy for BooleanPredicate<Item>

impl<Item: PartialEq> PartialEq for BooleanPredicate<Item>

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

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &BooleanPredicate<Item>) -> bool

This method tests for !=.

impl<Item: Eq> Eq for BooleanPredicate<Item>

impl<Item> Predicate<Item> for BooleanPredicate<Item>

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<Item> PredicateReflection for BooleanPredicate<Item>

Important traits for Box<R>

impl<R> Read for Box<R> where
    R: Read + ?Sized, impl<W> Write for Box<W> where
    W: Write + ?Sized, impl<I> Iterator for Box<I> where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

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

Parameters of the current Predicate.

Important traits for Box<R>

impl<R> Read for Box<R> where
    R: Read + ?Sized, impl<W> Write for Box<W> where
    W: Write + ?Sized, impl<I> Iterator for Box<I> where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

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

Nested Predicates of the current Predicate.

impl<Item> Display for BooleanPredicate<Item>

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

Formats the value using the given formatter.