/*
 *  call-seq:
 *     pq.capacity -> integer
 *  
 *  Returns the capacity of the queue, ie. the number of elements that can be
 *  stored in a Priority queue before they start to drop off the end.  The
 *  _size_ of a PriorityQueue can never be greater than its
 *  _capacity_
 */
static VALUE
frt_pq_capa(VALUE self)
{
    PriQ *pq;
    GET_PQ(pq, self);
    return INT2FIX(pq->capa);
}