/src/tools/semantics/code/liberty_expression.e

 1-- This file is part of Liberty Eiffel.
 2--
 3-- Liberty Eiffel 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, version 3 of the License.
 6--
 7-- Liberty Eiffel is distributed in the hope that it will be useful,
 8-- but WITHOUT ANY WARRANTY; without even the implied warranty of
 9-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10-- GNU General Public License for more details.
11--
12-- You should have received a copy of the GNU General Public License
13-- along with Liberty Eiffel.  If not, see <http://www.gnu.org/licenses/>.
14--
15deferred class LIBERTY_EXPRESSION
16
17inherit
18   LIBERTY_TAGGED
19
20insert
21   LIBERTY_POSITIONABLE
22   LIBERTY_REACHABLE
23   VISITABLE
24
25feature {ANY}
26   result_type: LIBERTY_TYPE is
27      deferred
28      ensure
29         Result /= Void or else result_type_may_be_void
30      end
31
32   result_type_may_be_void: BOOLEAN is
33      do
34         Result := is_agent_call
35      end
36
37   is_agent_call: BOOLEAN is False
38   is_open_argument: BOOLEAN is False
39
40   specialized_in (a_type: LIBERTY_ACTUAL_TYPE): like Current is
41      require
42         a_type /= Void
43      deferred
44      ensure
45         Result /= Void
46      end
47
48invariant
49   (not result_type_may_be_void) implies result_type /= Void
50
51end