Program Listing for File bucketedqueue.hxx

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/*
 * Copyright (c) 2011-2012, C. Sprunk, B. Lau, W. Burgard, University of Freiburg
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the University of Freiburg nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "bucketedqueue.h"

#include "limits.h"

template <class T>
BucketPrioQueue<T>::BucketPrioQueue() {
  nextPop = buckets.end();
  count = 0;
}

template <class T>
bool BucketPrioQueue<T>::empty() {
  return (count==0);
}


template <class T>
void BucketPrioQueue<T>::push(int prio, T t) {
  buckets[prio].push(t);
  if (nextPop == buckets.end() || prio < nextPop->first) nextPop = buckets.find(prio);
  count++;
}

template <class T>
T BucketPrioQueue<T>::pop() {
  while (nextPop!=buckets.end() && nextPop->second.empty()) ++nextPop;

  T p = nextPop->second.front();
  nextPop->second.pop();
  if (nextPop->second.empty()) {
    typename BucketType::iterator it = nextPop;
    nextPop++;
    buckets.erase(it);
  }
  count--;
  return p;
}