/-
Copyright (c) 2016 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
-/
prelude
import init.fin
open nat

definition char := fin 256

namespace char

definition of_nat (n : nat) : char :=
if H : n < 256 then fin.mk n H else fin.mk 0 dec_trivial

definition to_nat (c : char) : nat :=
fin.val c
end char

definition char_has_decidable_eq [instance] : decidable_eq char :=
have decidable_eq (fin 256), from _,
this

definition char_is_inhabited [instance] : inhabited char :=
inhabited.mk (char.of_nat 65)