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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 ]
- !!
-
-