Path: utzoo!utgpu!watserv1!watmath!att!rutgers!mephisto!tut.cis.ohio-state.edu!cs.utexas.edu!rice!uw-beaver!fluke!dyndata!dan
From: dan@dyndata.UUCP (Dan Everhart)
Newsgroups: comp.lang.c++
Subject: Bogus pure macro (was: Re: #defines....)
Message-ID: <688@dyndata.UUCP>
Date: 6 Jul 90 03:19:31 GMT
References: <686@dyndata.UUCP>
Organization: Dynamic Data & Electronics, Edmonds WA
Lines: 25
In-reply-to: dan@dyndata.UUCP's message of 5 Jul 90 17:51:03 GMT


I'd like to recant a suggestion I made recently:

In article <686@dyndata.UUCP> dan@dyndata.UUCP (Dan Everhart) writes:

   #if defined(DEBUG)
   #define pure	{ DebuggerTrap (); }
   #else
   #define	pure	= 0
   #endif

   class Xyz
      {
      // ...
      virtual f () pure;
      // ...
      } 

Turns out this will only work for virtuals which return void.
Otherwise the lack of a return statement in the debugging inline will
get you scolded by the compiler.  (Or should.  Turns out Zortech 2.0
doesn't catch this error-- a mixed blessing :-)  Maybe version 2.1
does, I don't know.  Turbo C++ 1.0 does catch it.)

Anyway...bag the above idea.