[−][src]Function predicates::iter::in_hash
pub fn in_hash<I, T>(iter: I) -> HashableInPredicate<T> where
T: Hash + Eq + Debug,
I: IntoIterator<Item = T>,
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 Hash + Eq
. 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_hash(vec![1, 3, 5]); 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_hash(vec!["a", "c", "e"]); assert_eq!(true, predicate_fn.eval("a")); assert_eq!(false, predicate_fn.eval("b")); assert_eq!(true, predicate_fn.eval("c"));