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/src/lib/design_patterns/visitor.e

http://github.com/tybor/Liberty
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 1-- This file is part of a Liberty Eiffel library.
 2-- See the full copyright at the end.
 3--
 4deferred class VISITOR
 5   --
 6   -- The "Acyclic Visitor" design pattern type marker. This class is empty as each "node visitor" must add
 7   -- its "visit" feature that visits the corresponding node of a Composite (and each node must inherit from
 8   -- VISITABLE).
 9   --
10   -- For examples, look at the tools/visitor cluster of Liberty Eiffel.
11   --
12   -- See also http://www.objectmentor.com/resources/articles/acv.pdf
13   --
14
15end -- class VISITOR
16--
17-- Copyright (C) 2009-2017: by all the people cited in the AUTHORS file.
18--
19-- Permission is hereby granted, free of charge, to any person obtaining a copy
20-- of this software and associated documentation files (the "Software"), to deal
21-- in the Software without restriction, including without limitation the rights
22-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
23-- copies of the Software, and to permit persons to whom the Software is
24-- furnished to do so, subject to the following conditions:
25--
26-- The above copyright notice and this permission notice shall be included in
27-- all copies or substantial portions of the Software.
28--
29-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
30-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
31-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
32-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
33-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
34-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
35-- THE SOFTWARE.