/*
 *  call-seq:
 *     pq.clear -> self
 *  
 *  Clears all elements from the priority queue. The size will be reset to 0.
 */
static VALUE
frt_pq_clear(VALUE self)
{
    PriQ *pq;
    GET_PQ(pq, self);
    pq->size = 0;
    return self;
}