1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2004-2008 Jean Privat <jean@pryen.org>
5 # This file is free software, which comes along with NIT. This software is
6 # distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
7 # without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
8 # PARTICULAR PURPOSE. You can modify it is you want, provided this header
9 # is kept unaltered, and a notification of the changes is added.
10 # You are allowed to redistribute it and sell it, alone or is a part of
13 # This module is about hashable things.
14 # It introduces an hash funtion in objects.
20 # The hash code of the object.
21 # Assuming that a = b -> a.hash = b.hash
23 # Without redefinition, it is the `id' of the instance.
24 fun hash
: Int do return object_id
/ 8
28 redef fun hash
do return self
32 redef fun hash
do return ascii