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

2 Mar 2002

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

...
  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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