"

 COPYRIGHT (c) 1988 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

Object subclass:#Magnitude

       instanceVariableNames:''

       classVariableNames:''

       poolDictionaries:''

       category:'Magnitude-General'

!

!Magnitude class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1988 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

version

    ^ '$Header: /cvs/stx/stx/libbasic/Magnitude.st,v 1.11 1995-11-11 15:23:55 cg Exp $'

!

documentation

"

    This is an abstract class definining common methods for

    Objects which can be compared by a kind of greater realation.

"

! !

!Magnitude methodsFor:'comparing'!

> aMagnitude

    "Compare the receiver with the argument and return true if the

     receiver is greater than the argument. Otherwise return false."

    ^ self subclassResponsibility

!

= aMagnitude

    "Compare the receiver with the argument and return true if the

     receiver is equal to the argument. Otherwise return false."

    ^ self subclassResponsibility

!

<= aMagnitude

    "Compare the receiver with the argument and return true if the

     receiver is less than or equal to the argument. Otherwise return false."

    ^ (self > aMagnitude) not

!

< aMagnitude

    "Compare the receiver with the argument and return true if the

     receiver is less than the argument. Otherwise return false."

    ^ (aMagnitude > self)

!

>= aMagnitude

    "Compare the receiver with the argument and return true if the

     receiver is greater than or equal to the argument.

     Otherwise return false."

    ^ (aMagnitude > self) not

!

min:aMagnitude

    "return the receiver or the argument, whichever has lesser magnitude"

    (self < aMagnitude) ifTrue:[^ self].

    ^ aMagnitude

    "

     1 min: 2

     1 min: 2.0

     2.0 min: 1.0

     2.0 min: 2

    "

!

max:aMagnitude

    "return the receiver or the argument, whichever has greater magnitude"

    (self > aMagnitude) ifTrue:[^ self].

    ^ aMagnitude

    "

     1 max: 2

     1 max: 2.0

     2.0 max: 1.0

     2.0 max: 2

    "

! !

!Magnitude methodsFor:'testing'!

between:min and:max

    "return whether the receiver is less than or equal to the argument max

     and greater than or equal to the argument min."

    (self < min) ifTrue:[^ false].

    (self > max) ifTrue:[^ false].

    ^ true

    "

     1.2 between:1 and:2

     (3/2) between:1 and:2

     (3/2) between:0 and:1

    "

!

in:anInterval

    "return whether the receiver is within the interval bounds"

    (self < anInterval start) ifTrue:[^ false].

    (self > anInterval stop) ifTrue:[^ false].

    ^ true

    "

     1.2 in:(1 to: 2)

     (3/2) in:(1 to: 2)

     (3/2) in:(0 to: 1)

    "

! !