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

http://github.com/tybor/Liberty · 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. --
  4. class 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. inherit
  12. ABSTRACT_AVL_DICTIONARY[V_, K_]
  13. rename
  14. make as abs_make
  15. end
  16. create {ANY}
  17. make
  18. feature {ANY}
  19. order: PREDICATE[TUPLE[K_, K_]]
  20. feature {}
  21. ordered (k1, k2: K_): BOOLEAN
  22. do
  23. Result := order.item([k1, k2])
  24. end
  25. a_new_node: EXT_AVL_DICTIONARY_NODE[V_, K_]
  26. do
  27. create Result.make(order)
  28. end
  29. make (a_order: like order)
  30. require
  31. a_order /= Void
  32. do
  33. order := a_order
  34. abs_make
  35. ensure
  36. order = a_order
  37. end
  38. invariant
  39. order /= Void
  40. end -- class EXT_AVL_DICTIONARY
  41. --
  42. -- Copyright (C) 2009-2017: by all the people cited in the AUTHORS file.
  43. --
  44. -- Permission is hereby granted, free of charge, to any person obtaining a copy
  45. -- of this software and associated documentation files (the "Software"), to deal
  46. -- in the Software without restriction, including without limitation the rights
  47. -- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  48. -- copies of the Software, and to permit persons to whom the Software is
  49. -- furnished to do so, subject to the following conditions:
  50. --
  51. -- The above copyright notice and this permission notice shall be included in
  52. -- all copies or substantial portions of the Software.
  53. --
  54. -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  55. -- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  56. -- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  57. -- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  58. -- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  59. -- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  60. -- THE SOFTWARE.