Trait predicates::prelude::Predicate

pub trait Predicate<Item: ?Sized>: Display {
    fn eval(&self, variable: &Item) -> bool;
}

Trait for generically evaluating a type against a dynamically created predicate function.

The exact meaning of eval depends on the situation, but will usually mean that the evaluated item is in some sort of pre-defined set. This is different from Ord and Eq in that an item will almost never be the same type as the implementing Predicate type.

Required Methods

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

Execute this Predicate against variable, returning the resulting boolean.

Implementors

• impl<Item> Predicate<Item> for BoxPredicate<Item> where
    Item: ?Sized, 
• impl<Item> Predicate<Item> for BooleanPredicate<Item>
• impl<F, T> Predicate<T> for FnPredicate<F, T> where
    F: Fn(&T) -> bool, 
• impl<T> Predicate<T> for InPredicate<T> where
    T: PartialEq + Debug, 
• impl<T> Predicate<T> for OrdInPredicate<T> where
    T: Ord + Debug, 
• impl<T> Predicate<T> for HashableInPredicate<T> where
    T: Hash + Eq + Debug, 
• impl<M, Item> Predicate<Item> for NamePredicate<M, Item> where
    M: Predicate<Item>,
    Item: ?Sized, 
• impl<T> Predicate<T> for EqPredicate<T> where
    T: PartialEq + Debug, 
• impl<T> Predicate<T> for OrdPredicate<T> where
    T: PartialOrd + Debug, 
• impl<M1, M2, Item> Predicate<Item> for AndPredicate<M1, M2, Item> where
    M1: Predicate<Item>,
    M2: Predicate<Item>,
    Item: ?Sized, 
• impl<M1, M2, Item> Predicate<Item> for OrPredicate<M1, M2, Item> where
    M1: Predicate<Item>,
    M2: Predicate<Item>,
    Item: ?Sized, 
• impl<M, Item> Predicate<Item> for NotPredicate<M, Item> where
    M: Predicate<Item>,
    Item: ?Sized, 
• impl Predicate<f64> for IsClosePredicate
• impl Predicate<Path> for ExistencePredicate
• impl Predicate<Path> for FileTypePredicate
• impl<P> Predicate<Path> for FileContentPredicate<P> where
    P: Predicate<[u8]>, 
• impl Predicate<Path> for BinaryFilePredicate
• impl Predicate<Path> for StrFilePredicate
• impl Predicate<str> for IsEmptyPredicate
• impl Predicate<str> for StartsWithPredicate
• impl Predicate<str> for EndsWithPredicate
• impl Predicate<str> for ContainsPredicate
• impl Predicate<str> for MatchesPredicate
• impl<P> Predicate<str> for TrimPredicate<P> where
    P: Predicate<str>, 
• impl<P> Predicate<OsStr> for Utf8Predicate<P> where
    P: Predicate<str>, 
• impl<P> Predicate<[u8]> for Utf8Predicate<P> where
    P: Predicate<str>, 
• impl Predicate<str> for DifferencePredicate
• impl Predicate<str> for RegexPredicate