Module Stdlib.Bool

Boolean values.

Booleans

type t = bool =
  1. | false
  2. | true

The type of booleans (truth values).

The constructors false and true are included here so that they have paths, but they are not intended to be used in user-defined data types.

val not : bool -> bool

not b is the boolean negation of b.

val (&&) : bool -> bool -> bool

e0 && e1 is the lazy boolean conjunction of expressions e0 and e1. If e0 evaluates to false, e1 is not evaluated. Right-associative operator at precedence level 3/11.

val (||) : bool -> bool -> bool

e0 || e1 is the lazy boolean disjunction of expressions e0 and e1. If e0 evaluates to true, e1 is not evaluated. Right-associative operator at precedence level 2/11.

Predicates and comparisons

val equal : bool -> bool -> bool

equal b0 b1 is true if and only if b0 and b1 are both true or both false.

val compare : bool -> bool -> int

compare b0 b1 is a total order on boolean values. false is smaller than true.

Converting

val to_int : bool -> int

to_int b is 0 if b is false and 1 if b is true.

val to_float : bool -> float

to_float b is 0. if b is false and 1. if b is true.

val to_string : bool -> string

to_string b is "true" if b is true and "false" if b is false.

val seeded_hash : int -> bool -> int

A seeded hash function for booleans, with the same output value as Hashtbl.seeded_hash. This function allows this module to be passed as argument to the functor Hashtbl.MakeSeeded.

  • since 5.1
val hash : bool -> int

An unseeded hash function for booleans, with the same output value as Hashtbl.hash. This function allows this module to be passed as argument to the functor Hashtbl.Make.

  • since 5.1