Re: Support for multi-position electro-mechanical keylocks

[Marc Balmer <marc%msys.ch@localhost>]

Am 06.08.2009 um 12:46 schrieb Anders Magnusson:

> Marc Balmer wrote:
> > Am 03.08.2009 um 16:58 schrieb Peter Seebach:
> >
> > > In message <7FA34163-C54B-435C-B147-DA2BBE06F848%msys.ch@localhost>, Marc  
> > > Balmer writes:
> > > > Am 03.08.2009 um 16:23 schrieb David Holland:
> > > >
> > > > > On Mon, Aug 03, 2009 at 03:45:34AM +0000, David Holland wrote:
> > > > > > On Sun, Aug 02, 2009 at 11:54:09AM +0200, Marc Balmer wrote:
> > > > > > > While preparing a hardware workshop and playing with multi- 
> > > > > > > position
> > > > > > > keylocks, [...]
> > > > > > >
> > > > > > > +       int                     __map[GPIOLOCK_MAXPINS];
> > > > >
> > > > > Er. That was supposed to say "why the underscores?"
> > > >
> > > > They are in the original code.  So why not?
> > >
> > > As a general rule, you shouldn't prefix things with underscores in  
> > > C.
> > > (C9x 7.1.3:  "All identifiers that begin with an underscore and
> > > either an uppercase letter or another underscore are always reserved
> > > for any use.")
> >
> > This section applies to identifiers in header files, i.e. to  
> > exported APIs, not to structure members.
> Exactly, so a header file connected to the system that includes  
> containing '#define __map :32'
> will cause your C code to fail compilation... :-)

__Only __if __I __include __it ;) (of course, you can still hose me by  
putting it into a system header...)

> -- Ragge