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/src/lib/design_patterns/observer.e

http://github.com/tybor/Liberty
Specman e | 38 lines | 8 code | 2 blank | 28 comment | 0 complexity | 24da721d6f378e03ace5c978eea71a99 MD5 | raw file
 1-- This file is part of a Liberty Eiffel library.
 2-- See the full copyright at the end.
 3--
 4deferred class OBSERVER[O_ -> OBSERVABLE]
 5   --
 6   -- The "Observer" Design Pattern. An Observer must be updated by an Observable (see the class OBSERVABLE in
 7   -- the lib/abilities cluster).
 8   --
 9
10feature {OBSERVABLE}
11   update (o: O_)
12         -- The observable object `o' wants Current to be updated
13      require
14         o /= Void
15      deferred
16      end
17
18end -- class OBSERVER
19--
20-- Copyright (C) 2009-2017: by all the people cited in the AUTHORS file.
21--
22-- Permission is hereby granted, free of charge, to any person obtaining a copy
23-- of this software and associated documentation files (the "Software"), to deal
24-- in the Software without restriction, including without limitation the rights
25-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
26-- copies of the Software, and to permit persons to whom the Software is
27-- furnished to do so, subject to the following conditions:
28--
29-- The above copyright notice and this permission notice shall be included in
30-- all copies or substantial portions of the Software.
31--
32-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
33-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
34-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
35-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
36-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
37-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
38-- THE SOFTWARE.