On Thu, 03 Dec 2009, Mindaugas Kavaliauskas wrote:
Hi,
> it would be nice to have multiple parameter support for both C and
> .PRG version of HB_SYMBOL_UNUSED() macro.
Variadic macros were added as part of C99 standard. Only few C compilers
like GCC supported variadic macros before C99 specification so we cannot
use them by default.
Anyhow if use C compiler with C99 compatible preprocessor then you can try
to implement it but because C preprocessor is not flexible enough to make
some more advanced conversions on __VA_ARGS__ then it is necessary to use
some hacks like stripped by optimizer dummy function, i.e.:
extern void _HB_SYMBOL_UNUSED_( int x, ... );
#undef HB_SYMBOL_UNUSED
#define HB_SYMBOL_UNUSED( ... ) \
do { if( 0 ) _HB_SYMBOL_UNUSED_( 0, __VA_ARGS__ ); } while( 0 )
In .prg code we do not have such problems ;-) so you can simply use:
#ytranslate HB_SYMBOL_UNUSED( <v1> , <v2> [, <vN> ] ) => ;
HB_SYMBOL_UNUSED( <v1> ) ;
; HB_SYMBOL_UNUSED( <v2> ) ;
[ ; HB_SYMBOL_UNUSED( <vN> ) ]
best regards,
Przemek
_______________________________________________
Harbour mailing list (attachment size limit: 40KB)
Harbour@harbour-project.org
http://lists.harbour-project.org/mailman/listinfo/harbour
