/src/lib/storage/dictionary/ext_avl_dictionary.e
Specman e | 68 lines | 31 code | 8 blank | 29 comment | 0 complexity | 070daf9aeeb8239b7c08ab590bb15649 MD5 | raw file
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.