package preface

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package preface
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Class type

Implementation for Predicate.t.

A Predicate is just a function from 'a to bool.

Type

type 'a t = 'a -> bool

Implementation

Contravariant

module Contravariant : Preface_specs.CONTRAVARIANT with type 'a t = 'a t

Divisible

module Divisible : Preface_specs.DIVISIBLE with type 'a t = 'a t

Addtional functions

Additional functions to facilitate practical work with Predicate.t.

val negate : 'a t -> 'a t

negate the predicate.

val tautology : 'a t

A predicate always true.

val contradiction : 'a t

A predicate always false.

val and_ : 'a t -> 'a t -> 'a t

Compose two predicates (using and).

val or_ : 'a t -> 'a t -> 'a t

Compose two predicates (using or).

infix operators

module Infix : sig ... end
val (&&) : 'a t -> 'a t -> 'a t

Compose two predicates (using and).

val (||) : 'a t -> 'a t -> 'a t

Compose two predicates (using or).

val (!) : 'a t -> 'a t

negate the predicate.

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