[BusyBox] usage.h and ##_example_usage ???

[Erik Andersen]

On Thu Jul 22, 2004 at 02:45:15PM +0200, Steven Scholz wrote:
> Hi there,
> 
> what are the defines ##_example_usage in usage.h for?
> For further extension?

check out 'info cpp'.  Specifically the part about
"Macros with Variable Numbers of Arguments"

   This is a special feature of the GNU C preprocessor: `##'
   before a rest argument that is empty discards the preceding
   sequence of non-whitespace characters from the macro
   definition.  (If another macro argument precedes, none of it
   is discarded.)

 -Erik

--
Erik B. Andersen             http://codepoet-consulting.com/
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