gecko/xpcom/tests/TestPriorityQueue.cpp
2012-05-21 12:12:37 +01:00

97 lines
2.7 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: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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:
bool 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;
}