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From: tmoran@bix.com (Tom Moran)
Subject: Re: Multiple pragma Imports
Date: 1998/12/27
Message-ID: <3686918c.1630214@news.pacbell.net>#1/1
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References: <762u9n$kfn$1@nnrp1.dejanews.com> <F4LKJL.7z@jvdsys.stuyts.nl>
 <1998Dec27.083157.1@eisner>
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Newsgroups: comp.lang.ada
Date: 1998-12-27T00:00:00+00:00
List-Id: <comp.lang.ada>

A fairly common situation is that an Ada binding has separated two
distinct types, which are the same in C for some function.  Thus the
Ada binding might have types Server_Socket and Client_Socket, which
are opened and used with different parameters, but are closed by a C
function with a single parameter.  Then a naive thin binding might try
to have
  procedure Close(Client : in out Client_Socket);
  pragma import(C, Close, "SClose");
  procedure Close(Server : in out Server_Socket);
  pragma import(C, Close, "SClose");
As I understand Robert Dewar's message, this is in fact illegal Ada,
though it has been accepted by more than one compiler in the past.
Something like
  procedure Close(Client : in out Client_Socket);
  pragma import(C, Close, "SClose");
  procedure Close(Server : in out Server_Socket) is
  begin
     Close(Client_Socket(Server));  -- appropriate type conversion
  end Close;
 would be needed.