Absolutely! See below :)
On Thu, 2007-01-18 at 15:32 -0500, Peter Jay Salzman wrote:
> The variable p and the variable's name "p" need to be passed to the macro
> function to test for nullness and then to print some message involving the
> variable's name.
>
> Is there a crafty way of doing this so that only one thing needs to be
> passed?
>
> Thanks!
>
>
>
>
>
> #include <stdlib.h>
> #include <stdio.h>
>
> #define CHECK_FOR_NULLITITY(var,varname) \
> if ( (var) == NULL ) \
> { \
> printf("%s is null.\n", varname); \
> exit(EXIT_FAILURE); \
> }
>
#define CHECK_FOR_NULLITITY(var) \
if ( (var) == NULL ) \
{ \
printf("%s is null.\n", #var); \
exit(EXIT_FAILURE); \
}
>
>
> int main( void )
> {
> char *p = NULL;
> CHECK_FOR_NULLITITY( p, "p" );
>
> return 0;
> }
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--
Micah J. Cowan
Programmer, musician, typesetting enthusiast, gamer...
http://micah.cowan.name/
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