/*
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "config.h"
#include "wtf/HashSet.h"
#include <gtest/gtest.h>
namespace {
template<int initialCapacity>
struct InitialCapacityTestHashTraits : public WTF::UnsignedWithZeroKeyHashTraits<int> {
static const int minimumTableSize = initialCapacity;
};
template<unsigned size>
void testInitialCapacity()
{
const unsigned initialCapacity = WTF::HashTableCapacityForSize<size>::value;
HashSet<int, DefaultHash<int>::Hash, InitialCapacityTestHashTraits<initialCapacity> > testSet;
// Initial capacity is null.
ASSERT_EQ(0UL, testSet.capacity());
// Adding items up to size should never change the capacity.
for (size_t i = 0; i < size; ++i) {
testSet.add(i);
ASSERT_EQ(initialCapacity, testSet.capacity());
}
// Adding items up to less than half the capacity should not change the capacity.
unsigned capacityLimit = initialCapacity / 2 - 1;
for (size_t i = size; i < capacityLimit; ++i) {
testSet.add(i);
ASSERT_EQ(initialCapacity, testSet.capacity());
}
// Adding one more item increase the capacity.
testSet.add(initialCapacity);
EXPECT_GT(testSet.capacity(), initialCapacity);
}
template<unsigned size> void generateTestCapacityUpToSize();
template<> void generateTestCapacityUpToSize<0>()
{
}
template<unsigned size> void generateTestCapacityUpToSize()
{
generateTestCapacityUpToSize<size - 1>();
testInitialCapacity<size>();
}
TEST(WTF, HashSetInitialCapacity)
{
generateTestCapacityUpToSize<128>();
}
} // namespace