/usr/lib/ats-anairiats-0.2.5/prelude/DATS/option.dats is in ats-lang-anairiats 0.2.5-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(* *)
(* Applied Type System *)
(* *)
(* Hongwei Xi *)
(* *)
(***********************************************************************)
(*
** ATS - Unleashing the Potential of Types!
**
** Copyright (C) 2002-2008 Hongwei Xi, Boston University
**
** All rights reserved
**
** ATS is free software; you can redistribute it and/or modify it under
** the terms of the GNU LESSER GENERAL PUBLIC LICENSE as published by the
** Free Software Foundation; either version 2.1, or (at your option) any
** later version.
**
** ATS is distributed in the hope that it will be useful, but WITHOUT ANY
** WARRANTY; without even the implied warranty of MERCHANTABILITY or
** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
** for more details.
**
** You should have received a copy of the GNU General Public License
** along with ATS; see the file COPYING. If not, please write to the
** Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
** 02110-1301, USA.
*)
(* ****** ****** *)
(* author: Hongwei Xi (hwxi AT cs DOT bu DOT edu) *)
(* ****** ****** *)
#define ATS_DYNLOADFLAG 0 // loaded by [ats_main_prelude]
(* ****** ****** *)
staload "prelude/SATS/option.sats"
(* ****** ****** *)
// this is a casting function
implement
option_of_option_vt (ov) = case+ ov of
| ~Some_vt (v) => Some (v) | ~None_vt () => None ()
// end of [option_of_option_vt]
(* ****** ****** *)
implement
option_is_none (ov) =
case+ ov of None () => true | Some _ => false
// end of [option_is_none]
implement
option_is_some (ov) =
case+ ov of Some _ => true | None () => false
// end of [option_is_some]
(* ****** ****** *)
implement{a} option_some v = Some v
implement{a} option_unsome ov = let val Some v = ov in v end
implement{a}
option_app (ov, f) =
case+ ov of Some v => f v | None () => ()
// end of [option_app]
implement{a,b}
option_map (ov, f) =
case+ ov of Some v => Some (f v) | None () => None
// end of [option_map]
(* ****** ****** *)
(* end of [option.dats] *)
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