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From: rswhite@cacd.rockwell.com (Robert S. White)
Newsgroups: comp.lang.ada
Subject: Re: Importing C Structures
Date: 23 Mar 1995 18:55:02 GMT
Organization: Rockwell International, CACD
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References: <3kr4q3$jd9@newsflash.concordia.ca>
 <VLADIMIR.95Mar22235527@speedy.intrepid.com>
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Date: 1995-03-23T18:55:02+00:00
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In article <VLADIMIR.95Mar22235527@speedy.intrepid.com>, 
vladimir@speedy.intrepid.com says...
>
>If there is some some struct that you need to map to Ada, it should be
>farily straightforward. i.e.
>        - Vladimir

Do you have a clean way to handle hardware registers that have one
meaning when you read them and another when you write to them with
nice seperate names for each type of usage?  I know "use at" for 
Ada 83 can overide this but it seems to be not in the spirit of 
the 83 LRM;
  13.5 "Address clauses should not be used to achieve overlays of
        objects...Any program using address clauses to achieve
        such effects is erroneous."
A work around is to have a dual meaning name for the register and
use one procedure, appropriately named, to write to it and a function,
again with a suitable name, for reading it.

This is a case where C programmers use the union structure.  I 
confess that I have not ferreted out in the Ada 95 RM or Rational 
the right (and very concise) way to do this now.

Recommendations? 

Robert S. White  
76166.1137@compuserve.com  -- speaking for myself only