/*
 *  call-seq:
 *     bv1.xor!(bv2) -> self
 *  
 *  Perform a boolean _xor_ operation on +bv1+ and
 *  +bv2+ in place on +bv1+
 */
VALUE
frt_bv_xor_x(VALUE self, VALUE other)
{
    BitVector *bv1, *bv2;
    GET_BV(bv1, self);
    GET_BV(bv2, other);
    bv_xor_x(bv1, bv2);
    return self;
}