gecko-dev/xpcom/tests/TestPriorityQueue.cpp

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4.2 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Brian Birtles.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Brian Birtles <birtles@gmail.com>
*
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* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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#include "nsTPriorityQueue.h"
#include <stdio.h>
#include <stdlib.h>
template<class T, class Compare>
void
CheckPopSequence(const nsTPriorityQueue<T, Compare>& aQueue,
const T* aExpectedSequence, const PRUint32 aSequenceLength)
{
nsTPriorityQueue<T, Compare> copy(aQueue);
for (PRUint32 i = 0; i < aSequenceLength; i++) {
if (copy.IsEmpty()) {
printf("Number of elements in the queue is too short by %d.\n",
aSequenceLength - i);
exit(-1);
}
T pop = copy.Pop();
if (pop != aExpectedSequence[i]) {
printf("Unexpected value in pop sequence at position %d\n", i);
printf(" Sequence:");
for (size_t j = 0; j < aSequenceLength; j++) {
printf(" %d", aExpectedSequence[j]);
if (j == i) {
printf("**");
}
}
printf("\n ** Got %d instead\n", pop);
exit(-1);
}
}
if (!copy.IsEmpty()) {
printf("Number of elements in the queue is too long by %d.\n",
copy.Length());
exit(-1);
}
}
template<class A>
class MaxCompare {
public:
PRBool LessThan(const A& a, const A& b) {
return a > b;
}
};
int main()
{
nsTPriorityQueue<int> queue;
NS_ABORT_IF_FALSE(queue.IsEmpty(), "Queue not initially empty");
queue.Push(8);
queue.Push(6);
queue.Push(4);
queue.Push(2);
queue.Push(10);
queue.Push(6);
NS_ABORT_IF_FALSE(queue.Top() == 2, "Unexpected queue top");
NS_ABORT_IF_FALSE(queue.Length() == 6, "Unexpected queue length");
NS_ABORT_IF_FALSE(!queue.IsEmpty(), "Queue empty when populated");
int expected[] = { 2, 4, 6, 6, 8, 10 };
CheckPopSequence(queue, expected, sizeof(expected) / sizeof(expected[0]));
// copy ctor is tested by using CheckPopSequence, but check default assignment
// operator
nsTPriorityQueue<int> queue2;
queue2 = queue;
CheckPopSequence(queue2, expected, sizeof(expected) / sizeof(expected[0]));
queue.Clear();
NS_ABORT_IF_FALSE(queue.IsEmpty(), "Queue not emptied by Clear");
// try same sequence with a max heap
nsTPriorityQueue<int, MaxCompare<int> > max_queue;
max_queue.Push(8);
max_queue.Push(6);
max_queue.Push(4);
max_queue.Push(2);
max_queue.Push(10);
max_queue.Push(6);
NS_ABORT_IF_FALSE(max_queue.Top() == 10, "Unexpected queue top for max heap");
int expected_max[] = { 10, 8, 6, 6, 4, 2 };
CheckPopSequence(max_queue, expected_max,
sizeof(expected_max) / sizeof(expected_max[0]));
return 0;
}