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Groups > comp.lang.c++ > #68726

Re: upper case enumerator

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On 2019-09-28 at 04:37, Mark wrote:
> 
> [code]
> 
> 
> # ifndef XXX_YYY
> # define XXX_YYY
> 
> //# pragma once //this is what you should do today and beyond (all things being equal .. compiler support)
> # include <cstddef>
> # include <iostream>
> 
>   namespace foo
>   {
>     enum kFavoriteWine { kMoscato, XXX_YYY } ;
>   }
> 
> 
> # endif
> 
> auto main() -> int
> {
>    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
> 
> [/code]
> 

The preprocessor doesn't care about namespaces, it just replaces 
everything, everywhere.

One common way to avoid this problem is to reserve all-uppercase 
identifiers for the preprocessor, and not use those for anything else.


     Bo Persson

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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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