/src/lib/storage/internal/ext_avl_set_node.e

 1-- This file is part of a Liberty Eiffel library.
 2-- See the full copyright at the end.
 3--
 4class EXT_AVL_SET_NODE[E_]
 5   --
 6   -- Auxiliary class to implement EXT_AVL_SET.
 7   --
 8   -- This a classic implementation of an AVL tree (balanced tree first
 9   -- designed by Adelson-Velskii and Landis, 1960)
10   --
11
12inherit
13   ABSTRACT_AVL_SET_NODE[E_]
14
15create {EXT_AVL_SET}
16   make
17
18feature {}
19   order: PREDICATE[TUPLE[E_, E_]]
20
21   ordered (e1, e2: E_): BOOLEAN
22      do
23         Result := order.item([e1, e2])
24      end
25
26   make (a_order: like order)
27      require
28         a_order /= Void
29      do
30         order := a_order
31      ensure
32         order = a_order
33      end
34
35invariant
36   order /= Void
37
38end -- class EXT_AVL_SET_NODE
39--
40-- Copyright (C) 2009-2017: by all the people cited in the AUTHORS file.
41--
42-- Permission is hereby granted, free of charge, to any person obtaining a copy
43-- of this software and associated documentation files (the "Software"), to deal
44-- in the Software without restriction, including without limitation the rights
45-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
46-- copies of the Software, and to permit persons to whom the Software is
47-- furnished to do so, subject to the following conditions:
48--
49-- The above copyright notice and this permission notice shall be included in
50-- all copies or substantial portions of the Software.
51--
52-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
53-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
54-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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58-- THE SOFTWARE.