/*
 *  call-seq:
 *     bv.clear -> self
 *  
 *  Clears all set bits in the bit vector. Negated bit vectors will still have
 *  all bits set to *off*.
 */
VALUE
frt_bv_clear(VALUE self)
{
    BitVector *bv;
    GET_BV(bv, self);
    bv_clear(bv);
    bv_scan_reset(bv);
    return self;
}