Module Char

module Char: sig .. end

Character operations.

Characters are the elements of string and bytes values. Characters represent bytes, that is an integer in the range [0x00;0xFF].

Some of the functions of this module interpret the characters in the range [0x00;0x7F] as the characters of the ASCII character set.

Characters

type t = char

An alias for the type of characters.

val code : char -> int

code c is the byte corresponding to c. If c is an ASCII character this corresponds to its encoding in ASCII or UTF-8.

val chr : int -> char

Return the character with the given integer code.

Raises Invalid_argument if the argument is outside the range [0x00;0xFF].

val escaped : char -> string

Return a string representing the given character, with special characters escaped following the lexical conventions of OCaml. All characters outside the ASCII printable range [0x20;0x7E] are escaped, as well as backslash, double-quote, and single-quote.

Predicates and comparisons

ASCII characters

module Ascii: sig .. end

ASCII character set support.

val lowercase_ascii : char -> char

Use the equivalent Char.Ascii.lowercase instead.

Since 4.03

val uppercase_ascii : char -> char

Use the equivalent Char.Ascii.uppercase instead.

Since 4.03

Hashing

val seeded_hash : int -> t -> int

A seeded hash function for characters, 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 : t -> int

An unseeded hash function for characters, 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