1 -- Copyright 2008-2015 Free Software Foundation, Inc.
3 -- This program is free software; you can redistribute it and/or modify
4 -- it under the terms of the GNU General Public License as published by
5 -- the Free Software Foundation; either version 3 of the License, or
6 -- (at your option) any later version.
8 -- This program is distributed in the hope that it will be useful,
9 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
10 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 -- GNU General Public License for more details.
13 -- You should have received a copy of the GNU General Public License
14 -- along with this program. If not, see <http://www.gnu.org/licenses/>.
18 type Data_T is (One, Two, Three);
19 pragma Atomic (Data_T);
21 Data_Flag : Data_T := One;
23 procedure Increment is
25 if Data_Flag = Data_T'Last then
26 Data_Flag := Data_T'First;
28 Data_Flag := Data_T'Succ (Data_Flag);
32 function Is_First return Boolean is
34 return Data_Flag = Data_T'First;