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: 1.4 date: 2018/03/14 18:32:38

user: stefan

file: VoidObject.st directory: libbasic

module: stx stc-classLibrary: libbasic

Author:

Claus Gittinger

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.

Class protocol:

 initialize

for JavaScript code

 basicNew

VoidObject basicNew
VoidObject new

Instance protocol:

 printOn: aStream

 isVoid

Void isVoid