/src/lib/storage/dictionary/ext_avl_dictionary.e

 1-- This file is part of a Liberty Eiffel library.
 2-- See the full copyright at the end.
 3--
 4class EXT_AVL_DICTIONARY[V_, K_]
 5   --
 6   -- Associative memory. Values of type `V_' are stored using Keys of type `K_'.
 7   --
 8   -- Efficient implementation of DICTIONARY using an AVL balanced tree. AVL stands for the names of G. M. Adel'son-Velskii
 9   -- and E. M. Landis, two Russian mathematicians who first came up with this method of keeping the tree balanced.
10   --
11
12inherit
13   ABSTRACT_AVL_DICTIONARY[V_, K_]
14      rename
15         make as abs_make
16      end
17
18create {ANY}
19   make
20
21feature {ANY}
22   order: PREDICATE[TUPLE[K_, K_]]
23
24feature {}
25   ordered (k1, k2: K_): BOOLEAN
26      do
27         Result := order.item([k1, k2])
28      end
29
30   a_new_node: EXT_AVL_DICTIONARY_NODE[V_, K_]
31      do
32         create Result.make(order)
33      end
34
35   make (a_order: like order)
36      require
37         a_order /= Void
38      do
39         order := a_order
40         abs_make
41      ensure
42         order = a_order
43      end
44
45invariant
46   order /= Void
47
48end -- class EXT_AVL_DICTIONARY
49--
50-- Copyright (C) 2009-2017: by all the people cited in the AUTHORS file.
51--
52-- Permission is hereby granted, free of charge, to any person obtaining a copy
53-- of this software and associated documentation files (the "Software"), to deal
54-- in the Software without restriction, including without limitation the rights
55-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
56-- copies of the Software, and to permit persons to whom the Software is
57-- furnished to do so, subject to the following conditions:
58--
59-- The above copyright notice and this permission notice shall be included in
60-- all copies or substantial portions of the Software.
61--
62-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
63-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
64-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
65-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
66-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
67-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
68-- THE SOFTWARE.