/*
 *  call-seq:
 *     bv.not! -> self
 *  
 *  Perform a boolean _not_ operation on +bv+ in-place
 */
VALUE
frb_bv_not_x(VALUE self)
{
    BitVector *bv;
    GET_BV(bv, self);
    bv_not_x(bv);
    return self;
}