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Macro does not work in source code.

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  Macro does not work in source code. Nephi Immortal <immortalnephi@gmail.com> - 2011-07-28 17:36 -0700
    Re: Macro does not work in source code. Sam <sam@email-scan.com> - 2011-07-28 20:41 -0500
    Re: Macro does not work in source code. red floyd <no.spam.here@its.invalid> - 2011-07-28 23:45 -0700
      Re: Macro does not work in source code. Juha Nieminen <nospam@thanks.invalid> - 2011-07-29 10:01 +0000
        Re: Macro does not work in source code. "Alf P. Steinbach" <alf.p.steinbach:usenet@gmail.com> - 2011-07-29 13:31 +0200
    Re: Macro does not work in source code. MJ_India <mail.mohitjain@gmail.com> - 2011-07-29 23:41 -0700
      Re: Macro does not work in source code. Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-07-30 12:58 +0000
        Re: Macro does not work in source code. Brian Casiello <bcasiello@gmail.com> - 2011-07-30 11:39 -0400
          Re: Macro does not work in source code. Paul Brettschneider <paul.brettschneider@yahoo.fr> - 2011-07-31 18:12 +0200
            Re: Macro does not work in source code. Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-07-31 18:30 +0000
              Re: Macro does not work in source code. "Alf P. Steinbach" <alf.p.steinbach:usenet@gmail.com> - 2011-08-01 00:48 +0200
                Re: Macro does not work in source code. "Alf P. Steinbach" <alf.p.steinbach:usenet@gmail.com> - 2011-08-01 00:52 +0200
                  Re: Macro does not work in source code. Paul Brettschneider <paul.brettschneider@yahoo.fr> - 2011-08-01 08:58 +0200
                    Re: Macro does not work in source code. "Alf P. Steinbach" <alf.p.steinbach:usenet@gmail.com> - 2011-08-01 10:11 +0200
                      Re: Macro does not work in source code. James Kanze <james.kanze@gmail.com> - 2011-08-07 11:00 -0700
                        Re: Macro does not work in source code. "Alf P. Steinbach" <alf.p.steinbach:usenet@gmail.com> - 2011-08-07 22:50 +0200
                          Re: Macro does not work in source code. Ian Collins <ian-news@hotmail.com> - 2011-08-08 09:15 +1200
                  Re: Macro does not work in source code. Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-01 12:09 +0000
                    Re: Macro does not work in source code. Miles Bader <miles@gnu.org> - 2011-08-02 14:53 +0900
                Re: Macro does not work in source code. Ian Collins <ian-news@hotmail.com> - 2011-08-01 10:55 +1200
        Re: Macro does not work in source code. James Kanze <james.kanze@gmail.com> - 2011-08-07 10:47 -0700
          Re: Macro does not work in source code. Marc <marc.glisse@gmail.com> - 2011-08-07 18:13 +0000

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#8546

On Jul 30, 1:58 pm, Jorgen Grahn <grahn+n...@snipabacken.se> wrote:
> On Sat, 2011-07-30, MJ_India wrote:
> > On Jul 29, 9:36 am, Nephi Immortal <immortalne...@gmail.com> wrote:

> ...

> > 1. #ifdef DEMO_H is masking all the code of file demo.h
> > Are you sure you don't want to write
> > #ifndef DEMO_H
> > #define DEMO_H
> > ....
> > #endif
> > [Prefer to use #pragma once instead of ifndef guards]

> That last sentence -- is that supposed to be an advice? I've never
> seen anything other than the include guard stuff you described above.
> And my compiler (g++) doesn't seem to have a pragma named "once".

It's very bad advice.  (Although I seem to recall that #pragma
once does work with g++.  G++ makes a certain effort to be
compatible with VC++---even to the point of being bug
compatible.)  #pragma (regardless of which one) is only for
things which are only relevant to a single compiler.

--
James Kanze

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#8549

James Kanze  wrote:

> #pragma (regardless of which one) is only for
> things which are only relevant to a single compiler.

That may be true in C++, but it isn't in C which defines a number of
standard pragmas.

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