gcc/testsuite/gm2/types/varient.mod

   1 (* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. *)
   2 (* This file is part of GNU Modula-2.
   3
   4 GNU Modula-2 is free software; you can redistribute it and/or modify it under
   5 the terms of the GNU General Public License as published by the Free
   6 Software Foundation; either version 2, or (at your option) any later
   7 version.
   8
   9 GNU Modula-2 is distributed in the hope that it will be useful, but WITHOUT ANY
  10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 for more details.
  13
  14 You should have received a copy of the GNU General Public License along
  15 with gm2; see the file COPYING.  If not, write to the Free Software
  16 Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *)
  17 MODULE varient ;
  18
  19
  20
  21 TYPE
  22    Operator = (add, mult, sub) ;
  23
  24    One  = RECORD
  25              First,
  26              Second,
  27              Third: CHAR ;
  28           END ;
  29
  30    Two  = RECORD
  31              ch: CHAR ;
  32              CASE ch OF
  33
  34              'a': First: CARDINAL |
  35              'b': Second,
  36                   Third : CHAR
  37
  38              END
  39           END ;
  40
  41    Three = RECORD
  42               First,
  43               Second,
  44               Third : CARDINAL ;
  45            END ;
  46
  47    Node = RECORD
  48              Op             : Operator ;
  49              CASE Op OF
  50
  51              add        : Add    : One |
  52              mult       : Mult   : Two |
  53              sub        : Sub    : Three
  54
  55              END
  56           END ;
  57
  58
  59 VAR
  60    t: Node ;
  61    i: INTEGER ;
  62 BEGIN
  63 (*
  64    t.Op := add ;
  65    t.Add.First := 'a' ;
  66 *)
  67    t.Add.Third := 'b' ;
  68
  69 (*
  70    t.Op := mult ;
  71
  72    t.Mult.ch := 'b' ;
  73    t.Mult.First  := 1234
  74 *)
  75    i := 9
  76 END varient.