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: 1.4 date: 2013/07/27 08:10:10

user: cg

file: BooleanValueHolder.st directory: libview2

module: stx stc-classLibrary: libview2

Author:

Claus Gittinger

Description:

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

Class protocol:

 new

return a new BooleanValueHolder holding false as initial value

Instance protocol:

 setValue: aBoolean

 & anotherBooleanValueHolder

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

 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

Examples:

     |b nb|

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