/usr/share/gnu-smalltalk/kernel/IdentitySet.st is in gnu-smalltalk-common 3.2.4-2.1.
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| IdentitySet Method Definitions
|
|
======================================================================"
"======================================================================
|
| Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
| Written by Paolo Bonzini.
|
| This file is part of the GNU Smalltalk class library.
|
| The GNU Smalltalk class library is free software; you can redistribute it
| and/or modify it under the terms of the GNU Lesser General Public License
| as published by the Free Software Foundation; either version 2.1, or (at
| your option) any later version.
|
| The GNU Smalltalk class library is distributed in the hope that it will be
| useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
| General Public License for more details.
|
| You should have received a copy of the GNU Lesser General Public License
| along with the GNU Smalltalk class library; see the file COPYING.LIB.
| If not, write to the Free Software Foundation, 59 Temple Place - Suite
| 330, Boston, MA 02110-1301, USA.
|
======================================================================"
Set subclass: IdentitySet [
<shape: #pointer>
<category: 'Collections-Unordered'>
<comment: 'I am the typical set object; I can store any objects uniquely. I
use the == operator to determine duplication of objects.'>
identityIncludes: anObject [
"Answer whether we include the anObject object; for IdentitySets
this is identical to #includes:"
<category: 'testing'>
^self includes: anObject
]
hashFor: anObject [
"Return an hash value for the item, anObject"
<category: 'private methods'>
^anObject identityHash
]
findIndex: anObject [
"Tries to see if anObject exists as an indexed variable. As soon as nil
or anObject is found, the index of that slot is answered"
<category: 'private methods'>
| index size element |
self beConsistent.
"Sorry for the lack of readability, but I want speed... :-)"
index := (anObject identityHash scramble
bitAnd: (size := self primSize) - 1) + 1.
[((element := self primAt: index) isNil or: [element == anObject])
ifTrue: [^index].
index == size ifTrue: [index := 1] ifFalse: [index := index + 1]]
repeat
]
]
|