Class: BooleanValueHolder

• Inheritance
• Description
• Class protocol
  • instance creation
• Instance protocol
  • accessing
  • logical operations
• Examples

Inheritance:

   Object
   |
   +--Model
      |
      +--ValueModel
         |
         +--ValueHolder
            |
            +--BooleanValueHolder

Package:

stx:libview2

Category:

Interface-Support-Models

Version:

rev: 1.5 date: 2021/01/20 14:36:43

user: cg

file: BooleanValueHolder.st directory: libview2

module: stx stc-classLibrary: libview2

Description:

a valueHolder holding a boolean.
Mostly for documentation purposes and the assertion, that only boolean values
are held. Also provides convenient logical operations.

copyright
COPYRIGHT (c) 2008 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.

Class protocol:

 new

return a new BooleanValueHolder holding false as initial value

Instance protocol:

 setValue: aBoolean

(comment from inherited method)
set my value without notification.

 & anotherBooleanValueHolder

return another valueHolder, which returns the logical and of myself and another valueHolder

Usage example(s):

|b1 b2 a| b1 := BooleanValueHolder new. b2 := BooleanValueHolder new. a := b1 & b2. b1 value:false. b2 value:true. a value. b1 value:true. a value.

 logicalNot

return another valueHolder, which returns the logical not of myself

 | anotherBooleanValueHolder

return another valueHolder, which returns the logical or of myself and another valueHolder

Usage example(s):

|b1 b2 o| b1 := BooleanValueHolder new. b2 := BooleanValueHolder new. o := b1 | b2. b1 value:false. b2 value:false. o value. b1 value:true. o value.

Examples:

     |b nb|

     b := BooleanValueHolder new.
     nb := b not.
     b value:true.
     nb value.     
     b value:false.
     nb value.