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Groups > comp.lang.c++ > #68740

Re: upper case enumerator

From Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups comp.lang.c++
Subject Re: upper case enumerator
Date 2019-09-28 21:58 +0100
Organization A noiseless patient Spider
Message-ID <874l0wqgt6.fsf@bsb.me.uk> (permalink)
References <afea241c-fdd5-485d-89b2-22c402d7e3cb@googlegroups.com>

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Mark <ma740988@gmail.com> writes:

> # define XXX_YYY
<cut>
>  namespace foo
>  {
>    enum kFavoriteWine { kMoscato, XXX_YYY } ;
>  }

<cut>
>   using namespace foo ;
>   kFavoriteWine xx  = XXX_YYY ;

> Why does the upper case enumerator collided with the preprocessor
> macro even though the macro is wrapped in a namespace?  Can someone
> point me to some standard verbiage saying why that's wrong

To expand yet again on the other answers...

The verbiage is section 2.2 Phases of Translation.  It explains the
logical sequence in which source files are processed.  Macros are
expanded in phase 4, whereas what we usually think of a parsing happens
in phase 7.  By phase 7 there is no identifier 'XXX_YYY' -- they all
vanished in phase 4.

-- 
Ben.

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Thread

upper case enumerator Mark <ma740988@gmail.com> - 2019-09-27 19:37 -0700
  Re: upper case enumerator Ian Collins <ian-news@hotmail.com> - 2019-09-28 14:43 +1200
  Re: upper case enumerator Louis Krupp <lkrupp@nospam.pssw.com.invalid> - 2019-09-27 23:48 -0600
  Re: upper case enumerator Bo Persson <bo@bo-persson.se> - 2019-09-28 10:06 +0200
  Re: upper case enumerator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-09-28 21:58 +0100
  Re: upper case enumerator Öö Tiib <ootiib@hot.ee> - 2019-09-28 17:10 -0700
    Re: upper case enumerator Vir Campestris <vir.campestris@invalid.invalid> - 2019-09-29 21:45 +0100
      Re: upper case enumerator Manfred <noname@add.invalid> - 2019-09-29 23:29 +0200
      Re: upper case enumerator Ian Collins <ian-news@hotmail.com> - 2019-09-30 16:36 +1300
        Re: upper case enumerator Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-09-30 12:25 +0000
          Re: upper case enumerator Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-09-30 14:55 +0100
  Re: upper case enumerator James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-09-30 01:11 -0400
  Re: upper case enumerator Frederick Gotham <cauldwell.thomas@gmail.com> - 2019-09-30 01:34 -0700

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