Frama-C API - Operators

Opening this module allows to use shorter syntax to deal with files.

let open Filesystem.Operators in
let result =
  let+ channel = Filesystem.with_open_out filepath in
  output_string channel "42";
in
match result with
| Ok () -> ()
| Error error ->
  Format.printf "error writing to file %a: %s"
    Filepath.pretty filepath
    error

When the file processing returns a result by itself, the operator let* can be used instead:

let open Filesystem.Operators in
let* channel = Filesystem.with_open_in filepath in
try
  let header = input_line channel in
  if header = "42"
  then Ok ()
  else Error "wrong file header"
with End_of_file ->
  Error "file is empty"

Result operators

These operators are intended to be used with with_open_in or with_open_out.

Sys_error operators

These operators are intended to be used with with_open_in_exn or with_open_out_exn, exception Sys_error must be caught.