Class: VoidObject

• Inheritance
• Description
• Class protocol
  • class initialization
  • instance creation
• Instance protocol
  • printing & storing
  • queries

Inheritance:

   Object
   |
   +--VoidObject

Package:

stx:libbasic

Category:

Kernel-Objects

Version:

rev: 1.6 date: 2021/09/27 06:55:19

user: cg

file: VoidObject.st directory: libbasic

module: stx stc-classLibrary: libbasic

Description:

there is only one instance of this class: Void,
representing a void value.

This is mainly present for Scheme-like read-eval-print loops,
in which methods may return void to prevent it from being printed.

It may also be useful to represent void values as returned from calls
to external functions (C-void functions) or from remote procedure calls.

Smalltalk code does not normally use it.

copyright
COPYRIGHT (c) 2016 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:

 initialize

for JavaScript code

 new

VoidObject basicNew
VoidObject new

Instance protocol:

 printOn: aStream

(comment from inherited method)
append a user printed representation of the receiver to aStream.
The format is suitable for a human - not meant to be read back.

The default here is to output the receiver's class name.
BUT: this method is heavily redefined for objects which
can print prettier.

 isVoid

Void isVoid