package stdint-literals

Stdint literals

This small PPX rewriter allows you to write literals for some of stdint's types using single-character suffixes on integers:

• u denotes an uint8

• U denotes an uint16

• i denotes an uint32

• I denotes an uint64

• w denotes an uint128

• s denotes an int8

• S denotes an int16

• l denotes an int32 (default behavior in OCaml)

• L denotes an int64 (default behavior in OCaml)

• W denotes an int128

Usage

Add stdint-literals in your dune file as follows:

(executable
  (name example)
  (preprocess (pps stdint-literals))
  (libraries stdint))

Example

let simple_literals =
  let i8 = 42u in
  Format.printf "%a\n" Stdint.Uint8.printer i8 ;
  let i16 = 42U in
  Format.printf "%a\n" Stdint.Uint16.printer i16 ;
  let s8 = 42s in
  Format.printf "%a\n" Stdint.Int8.printer s8 ;
  let s16 = 42S in
  Format.printf "%a\n" Stdint.Int16.printer s16

let hex_literals = 
  Format.printf "%a\n" Stdint.Uint16.printer_hex Stdint.Uint16.(0xDDAAU + 0xAADDU)

Of course, this also work on hexadecimal (or octal) literals.