Struct predicates::iter::InPredicate [−][src]
Expand description
Predicate that returns true
if variable
is a member of the pre-defined
set, otherwise returns false
.
Note that this implementation places the fewest restrictions on the
underlying Item
type at the expense of having the least performant
implementation (linear search). If the type to be searched is Hash + Eq
,
it is much more efficient to use HashableInPredicate
and
in_hash
. The implementation-specific predicates will be
deprecated when Rust supports trait specialization.
Implementations
Creates a new predicate that will return true
when the given variable
is
contained with the set of items provided.
Note that this implementation requires Item
to be Ord
. The
InPredicate
uses a less efficient search algorithm but only
requires Item
implement PartialEq
. The implementation-specific
predicates will be deprecated when Rust supports trait specialization.
Examples
use predicates::prelude::*;
let predicate_fn = predicate::in_iter(vec![1, 3, 5]).sort();
assert_eq!(true, predicate_fn.eval(&1));
assert_eq!(false, predicate_fn.eval(&2));
assert_eq!(true, predicate_fn.eval(&3));
let predicate_fn = predicate::in_iter(vec!["a", "c", "e"]).sort();
assert_eq!(true, predicate_fn.eval("a"));
assert_eq!(false, predicate_fn.eval("b"));
assert_eq!(true, predicate_fn.eval("c"));
Trait Implementations
This method tests for self
and other
values to be equal, and is used
by ==
. Read more
This method tests for !=
.
Auto Trait Implementations
impl<T> RefUnwindSafe for InPredicate<T> where
T: RefUnwindSafe,
impl<T> Send for InPredicate<T> where
T: Send,
impl<T> Sync for InPredicate<T> where
T: Sync,
impl<T> Unpin for InPredicate<T> where
T: Unpin,
impl<T> UnwindSafe for InPredicate<T> where
T: UnwindSafe,
Blanket Implementations
Mutably borrows from an owned value. Read more
fn and<B>(self, other: B) -> AndPredicate<Self, B, Item> where
B: Predicate<Item>,
Self: Sized,
fn and<B>(self, other: B) -> AndPredicate<Self, B, Item> where
B: Predicate<Item>,
Self: Sized,
Compute the logical AND of two Predicate
results, returning the result. Read more
Compute the logical OR of two Predicate
results, returning the result. Read more
Compute the logical NOT of a Predicate
, returning the result. Read more