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Class: DoubleLink


Inheritance:

   Object
   |
   +--Link
      |
      +--DoubleLink
         |
         +--ValueDoubleLink

Package:
stx:libbasic2
Category:
Collections-Support
Version:
rev: 1.2 date: 2016/06/09 10:23:06
user: cg
file: DoubleLink.st directory: libbasic2
module: stx stc-classLibrary: libbasic2
Author:
Claus Gittinger

Description:


this class provides the basic functionality for DoubleLink-nodes.
DoubleLinks are abstract in that they do not provide a place for storing 
something, just the link-chains. So concrete linkedList elements
must subclass from me and add their value slots.

For more usability look at ValueDoubleLink or other subclasses.


Instance protocol:

accessing
o  previousLink
return the previous link

o  previousLink: aLInk
set the previous link

converting
o  asDoubleLink



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