Would int* also work? Like in 
int
foo(ap,bp)
    int* ap
    int* bp
    PREINIT:
      int a, b;
    CODE:
      a = ap ? *ap : -1;
      b = bp ? *bp : -1;
      RETVAL = a * b;
    OUTPUT:
      RETVAL

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In reply to Re^2: Passing undef to XSUB by ikegami
in thread Passing undef to XSUB by pileofrogs

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