Booleans

type t = bool =
| false
| 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