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Magnitude.st
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1991-09-12
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"======================================================================
|
| Magnitude Method Definitions
|
======================================================================"
"======================================================================
|
| Copyright (C) 1990, 1991 Free Software Foundation, Inc.
| Written by Steve Byrne.
|
| This file is part of GNU Smalltalk.
|
| GNU Smalltalk is free software; you can redistribute it and/or modify it
| under the terms of the GNU General Public License as published by the Free
| Software Foundation; either version 1, or (at your option) any later version.
|
| GNU Smalltalk 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 General Public License for more
| details.
|
| You should have received a copy of the GNU General Public License along with
| GNU Smalltalk; see the file COPYING. If not, write to the Free Software
| Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
======================================================================"
"
| Change Log
| ============================================================================
| Author Date Change
| sbyrne 25 Apr 89 created.
|
"
Object subclass: #Magnitude
instanceVariableNames: ''
classVariableNames: ''
poolDictionaries: ''
category: nil.
Magnitude comment:
'I am an abstract class. My objects represent things that are discrete and
map to a number line. My instances can be compared with < and >.' !
!Magnitude methodsFor: 'basic'!
"Relational operators. '==', '~=', '~~' are inherited from Object"
= aMagnitude
self subclassResponsibility
!
< aMagnitude
self subclassResponsibility
!
> aMagnitude
self subclassResponsibility
!
<= aMagnitude
^(self < aMagnitude) | (self = aMagnitude)
!
>= aMagnitude
^(self > aMagnitude) | (self = aMagnitude)
!!
!Magnitude methodsFor: 'misc methods'!
between: min and: max
"Returns true if object is inclusively between min and max."
^(self >= min) and: [ self <= max ]
!
min: aMagnitude
self < aMagnitude ifTrue: [ ^self ]
ifFalse: [ ^aMagnitude ]
!
max: aMagnitude
self > aMagnitude ifTrue: [ ^self ]
ifFalse: [ ^aMagnitude ]
!!