Re: [Caml-list] Destructive use of file descriptors

[Pierrick Couderc <pierrick.couderc@ocamlpro.com>]

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Using higher order functions should be enough, I think?

I personnaly use this one when opening files (input in that case):

type 'a res = Ok of 'a | Error of exn
let safe_open_in f file =
  try
    let ic = open_in file in
    let r = try Ok (f ic) with e -> Error e in
    close_in ic;
    r
  with e -> Error e



2015-08-06 11:40 GMT+02:00 Goswin von Brederlow <goswin-v-b@web.de>:

> Hi,
>
> in Python one can write:
>
>     with open("foo") as fd:
>         fd.write(str)
>
> This involves some language magic that will open the file for the
> duration of the block and close it at the end. The file descriptor is
> automatically closed at a know time and not leaked or left until the
> GC gets around to cleaning it up.
>
> Has anyone constructed something like that for ocaml? Maybe with a ppx
> extension?
>
> MfG
>         Goswin
>
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