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// SPDX-License-Identifier: BSD-2-Clause
// Copyright CM4all GmbH
// author: Max Kellermann <max.kellermann@ionos.com>
#include "util/IntrusiveTreeSet.hxx"
#include <gtest/gtest.h>
#include <cstdlib> // for std::rand()
#include <deque>
#include <set>
#include <string>
namespace {
struct IntItem final : IntrusiveTreeSetHook<IntrusiveHookMode::TRACK> {
int value;
IntItem(int _value) noexcept:value(_value) {}
struct GetKey {
constexpr int operator()(const IntItem &item) const noexcept {
return item.value;
}
};
};
} // anonymous namespace
template<bool constant_time_size>
static void
TestBasic()
{
IntItem a{1}, b{2}, c{3}, d{4}, e{5}, f{1};
IntrusiveTreeSet<IntItem,
IntrusiveTreeSetOperators<IntItem, IntItem::GetKey>,
IntrusiveTreeSetBaseHookTraits<IntItem>,
IntrusiveTreeSetOptions{.constant_time_size=constant_time_size}> set;
EXPECT_EQ(set.size(), 0U);
EXPECT_TRUE(set.empty());
EXPECT_FALSE(a.is_linked());
EXPECT_FALSE(b.is_linked());
set.insert(b);
EXPECT_FALSE(a.is_linked());
EXPECT_TRUE(b.is_linked());
EXPECT_EQ(set.size(), 1U);
EXPECT_EQ(set.find(2), set.iterator_to(b));
EXPECT_EQ(&set.front(), &b);
set.insert(a);
EXPECT_EQ(&set.front(), &a);
EXPECT_TRUE(a.is_linked());
EXPECT_TRUE(b.is_linked());
set.insert(c);
EXPECT_EQ(&set.front(), &a);
EXPECT_EQ(set.size(), 3U);
EXPECT_NE(set.find(3), set.end());
EXPECT_EQ(set.find(3), set.iterator_to(c));
EXPECT_EQ(set.find(4), set.end());
EXPECT_TRUE(c.is_linked());
set.erase(set.iterator_to(c));
EXPECT_FALSE(c.is_linked());
EXPECT_EQ(set.size(), 2U);
EXPECT_EQ(set.find(3), set.end());
EXPECT_EQ(&set.front(), &a);
set.insert(c);
set.insert(d);
set.insert(e);
EXPECT_EQ(set.size(), 5U);
EXPECT_EQ(&set.front(), &a);
EXPECT_EQ(set.find(1), set.iterator_to(a));
EXPECT_EQ(set.find(2), set.iterator_to(b));
EXPECT_EQ(set.find(3), set.iterator_to(c));
EXPECT_EQ(set.find(4), set.iterator_to(d));
EXPECT_EQ(set.find(5), set.iterator_to(e));
EXPECT_TRUE(a.is_linked());
EXPECT_FALSE(f.is_linked());
set.erase(set.iterator_to(a));
EXPECT_FALSE(a.is_linked());
EXPECT_FALSE(f.is_linked());
EXPECT_EQ(set.find(1), set.end());
EXPECT_EQ(set.size(), 4U);
EXPECT_EQ(&set.front(), &b);
set.insert(f);
EXPECT_FALSE(a.is_linked());
EXPECT_TRUE(f.is_linked());
EXPECT_EQ(set.find(1), set.iterator_to(f));
EXPECT_EQ(set.size(), 5U);
EXPECT_EQ(&set.front(), &f);
set.pop_front();
EXPECT_FALSE(f.is_linked());
set.clear_and_dispose([](auto *i){ i->value = -1; });
EXPECT_EQ(set.size(), 0U);
EXPECT_TRUE(set.empty());
EXPECT_EQ(a.value, 1);
EXPECT_EQ(b.value, -1);
EXPECT_EQ(c.value, -1);
EXPECT_EQ(d.value, -1);
EXPECT_EQ(e.value, -1);
EXPECT_EQ(f.value, 1);
}
TEST(IntrusiveTreeSet, Basic)
{
TestBasic<false>();
TestBasic<true>();
}
template<int... values>
static constexpr auto
MakeIntItems(std::integer_sequence<int, values...>) noexcept
-> std::array<IntItem, sizeof...(values)>
{
return {values...};
}
TEST(IntrusiveTreeSet, RandomOrder)
{
auto items = MakeIntItems(std::make_integer_sequence<int, 32>());
IntrusiveTreeSet<IntItem,
IntrusiveTreeSetOperators<IntItem, IntItem::GetKey>> set;
set.insert(items[0]);
set.insert(items[5]);
set.insert(items[10]);
set.insert(items[15]);
set.insert(items[20]);
set.insert(items[25]);
set.insert(items[30]);
set.insert(items[1]);
set.insert(items[2]);
set.insert(items[3]);
set.insert(items[31]);
set.insert(items[4]);
set.insert(items[6]);
set.insert(items[7]);
set.insert(items[21]);
set.insert(items[22]);
set.insert(items[23]);
set.insert(items[24]);
set.insert(items[26]);
set.insert(items[8]);
set.insert(items[9]);
set.insert(items[11]);
set.insert(items[12]);
set.insert(items[13]);
set.insert(items[14]);
set.insert(items[27]);
set.insert(items[28]);
set.insert(items[29]);
set.insert(items[16]);
set.insert(items[17]);
set.insert(items[18]);
set.insert(items[19]);
EXPECT_EQ(set.size(), items.size());
for (const auto &i : items) {
EXPECT_TRUE(i.is_linked());
}
int expected = 0;
for (const auto &i : set) {
EXPECT_EQ(i.value, expected++);
}
for (std::size_t remove = 0; remove < items.size(); ++remove) {
EXPECT_TRUE(items[remove].is_linked());
set.pop_front();
EXPECT_FALSE(items[remove].is_linked());
#ifndef NDEBUG
set.Check();
#endif
expected = remove + 1;
for (const auto &i : set) {
EXPECT_EQ(i.value, expected++);
}
}
}
TEST(IntrusiveTreeSet, LargeRandom)
{
std::set<int> dedup;
std::deque<std::unique_ptr<IntItem>> items;
IntrusiveTreeSet<IntItem,
IntrusiveTreeSetOperators<IntItem, IntItem::GetKey>> set;
std::srand(42);
for (unsigned i = 0; i < 1024; ++i) {
/* prevent duplicates to avoid different ordering of
identical values in the std::deque and in the
IntrusiveTreeSet */
int value;
while (true) {
value = std::rand();
if (dedup.insert(value).second)
break;
}
items.emplace_back(std::make_unique<IntItem>(value));
set.insert(*items.back());
#ifndef NDEBUG
set.Check();
#endif
}
std::sort(items.begin(), items.end(), [](const auto &a, const auto &b){
return a->value < b->value;
});
std::size_t idx = 0;
for (const auto &i : set) {
EXPECT_EQ(i.value, items[idx++]->value);
}
while (!set.empty()) {
EXPECT_FALSE(items.empty());
EXPECT_TRUE(items.front()->is_linked());
EXPECT_EQ(items.front()->value, set.front().value);
// erase the front element
set.pop_front();
EXPECT_FALSE(items.front()->is_linked());
items.pop_front();
#ifndef NDEBUG
set.Check();
#endif
// erase a random element
const auto r = std::next(items.begin(), std::rand() % items.size());
EXPECT_TRUE((*r)->is_linked());
set.erase(set.iterator_to(**r));
EXPECT_FALSE((*r)->is_linked());
items.erase(r);
#ifndef NDEBUG
set.Check();
#endif
idx = 0;
for (const auto &i : set) {
EXPECT_EQ(i.value, items[idx++]->value);
}
}
EXPECT_TRUE(items.empty());
}
struct ZeroIntItem final : IntrusiveTreeSetHook<IntrusiveHookMode::TRACK> {
int value = 0;
struct GetKey {
constexpr int operator()(const ZeroIntItem &item) const noexcept {
return item.value;
}
};
};
/**
* Fill a tree with many all-zero values. This verifies the
* robustness of the RedBlackTree implementation for this corner case.
*/
TEST(IntrusiveTreeSet, Zero)
{
std::array<ZeroIntItem, 1024> items;
IntrusiveTreeSet<ZeroIntItem,
IntrusiveTreeSetOperators<ZeroIntItem, ZeroIntItem::GetKey>> set;
set.insert(items[0]);
set.insert(items[5]);
set.insert(items[10]);
set.insert(items[15]);
set.insert(items[20]);
set.insert(items[25]);
set.insert(items[30]);
set.insert(items[1]);
set.insert(items[2]);
set.insert(items[3]);
set.insert(items[31]);
set.insert(items[4]);
set.insert(items[6]);
set.insert(items[7]);
set.insert(items[21]);
set.insert(items[22]);
set.insert(items[23]);
set.insert(items[24]);
set.insert(items[26]);
set.insert(items[8]);
set.insert(items[9]);
set.insert(items[11]);
set.insert(items[12]);
set.insert(items[13]);
set.insert(items[14]);
set.insert(items[27]);
set.insert(items[28]);
set.insert(items[29]);
set.insert(items[16]);
set.insert(items[17]);
set.insert(items[18]);
set.insert(items[19]);
for (std::size_t i = 32; i < items.size(); ++i)
set.insert(items[i]);
EXPECT_EQ(set.size(), items.size());
for (const auto &i : items) {
EXPECT_TRUE(i.is_linked());
}
for (const auto &i : set) {
EXPECT_EQ(i.value, 0);
}
for (auto &i : items) {
EXPECT_TRUE(i.is_linked());
set.erase(set.iterator_to(i));
EXPECT_FALSE(i.is_linked());
#ifndef NDEBUG
set.Check();
#endif
}
EXPECT_TRUE(set.empty());
}
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