XS, get/set value when passing a ref

Hello,

I did fail in trying to change value in XS when I pass a reference:
Typically:
in perl:
my $a = 5 ;
test (\a) ;

in XS
void
test (nb)
   int *nb
   CODE:
     (*nb)++ ;

It does work,
Should I use a ref on a ref ?

-- 
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==========================================================================
  Patrick DUPRÉ                      |   |
  Department of Chemistry            |   |    Phone: (44)-(0)-1904-434384
  The University of York             |   |    Fax:   (44)-(0)-1904-432516
  Heslington                         |   |
  York YO10 5DD  United Kingdom      |   |    email: pd520@york.ac.uk
==========================================================================

• XS, get/set value when passing a ref by Patrick Dupre
• Re: XS, get/set value when passing a ref by Chas. Owens