Data abstraction - test-drb@ccmp.vtda.org

2 Mar 2002

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  From: Fred Cisin (XenoSoft) &lt;cisin(a)xenosoft.com&gt;

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  Consider three hypothetical forms of source code:
 A:     MOV     AH,     2
        MOV     DL,     41h
        INT     21h
 B:     MOV     AH,     2       ; character display function
        MOV     DL,     'B'
        INT     21h             ; DOS API
 C:     MOV     AH,     DISPLAY
        MOV     DL,     OURCHAR
        INT     DOSSERVICES
 I prefer B, but there were a few cases where I felt that he was tending
 towards C.  (and plenty of times when I slip into writing A) 
Yeah, the book is pretty much type 'C' code.
...
  Abstraction is very useful and necessary for some
types of portability.
 But I don't like to have to go thorough a separate .H file to find out
 what the code is that is being abstracted. 
Yeah, it's a hassle, but I think it's worth it to get easily-portable code.
 Only a few lines need to be changed to move the code to another machine.
All in all I would recommend this book.  Plus you, Fred Cisin, got double
kudos ;>)
Glen
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