Module predicates::predicate [−] [src]

Predicate

This module contains the Predicate trait and a number of combinators for the trait. See the crate docs, and the docs for Predicate, for full detail.

Structs

AndPredicate	Predicate that combines two `Predicate`s, returning the AND of the results.
BooleanPredicate	Predicate that always returns a constant (boolean) result.
BoxPredicate	`Predicate` that wraps another `Predicate` as a trait object, allowing sized storage of predicate types.
ContainsPredicate	Predicate that returns `true` if `variable` is a member of the pre-defined set, otherwise returns `false`.
EqPredicate	Predicate that returns `true` if `variable` matches the pre-defined `Eq` value, otherwise returns `false`.
FnPredicate	Predicate that wraps a function over a reference that returns a `bool`. This type is returned by the `predicate::function` function.
HashableContainsPredicate	Predicate that returns `true` if `variable` is a member of the pre-defined `HashSet`, otherwise returns `false`.
NotPredicate	Predicate that returns a `Predicate` taking the logical NOT of the result.
OrPredicate	Predicate that combines two `Predicate`s, returning the OR of the results.
OrdContainsPredicate	Predicate that returns `true` if `variable` is a member of the pre-defined set, otherwise returns `false`.
OrdPredicate	Predicate that returns `true` if `variable` matches the pre-defined `Ord` value, otherwise returns `false`.

Traits

Predicate

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

Functions

always	Creates a new `Predicate` that always returns `true`.
contains	Creates a new predicate that will return `true` when the given `variable` is contained with the set of items provided.
contains_hashable	Creates a new predicate that will return `true` when the given `variable` is contained with the set of items provided.
contains_ord	Creates a new predicate that will return `true` when the given `variable` is contained with the set of items provided.
eq	Creates a new predicate that will return `true` when the given `variable` is equal to a pre-defined value.
function	Creates a new predicate that wraps over the given function. The returned type implements `Predicate` and therefore has all combinators available to it.
ge	Creates a new predicate that will return `true` when the given `variable` is greater than or equal to a pre-defined value.
gt	Creates a new predicate that will return `true` when the given `variable` is greater than a pre-defined value.
le	Creates a new predicate that will return `true` when the given `variable` is less than or equal to a pre-defined value.
lt	Creates a new predicate that will return `true` when the given `variable` is less than a pre-defined value.
ne	Creates a new predicate that will return `true` when the given `variable` is not equal to a pre-defined value.
never	Creates a new `Predicate` that always returns `false`.