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btree_test.cc
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btree_test.cc
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// Copyright 2018 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/container/btree_test.h"
#include <algorithm>
#include <array>
#include <cstdint>
#include <functional>
#include <iterator>
#include <limits>
#include <map>
#include <memory>
#include <numeric>
#include <stdexcept>
#include <string>
#include <type_traits>
#include <utility>
#include <vector>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/algorithm/container.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/base/macros.h"
#include "absl/container/btree_map.h"
#include "absl/container/btree_set.h"
#include "absl/container/internal/counting_allocator.h"
#include "absl/container/internal/test_instance_tracker.h"
#include "absl/flags/flag.h"
#include "absl/hash/hash_testing.h"
#include "absl/memory/memory.h"
#include "absl/random/random.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/str_split.h"
#include "absl/strings/string_view.h"
#include "absl/types/compare.h"
ABSL_FLAG(int, test_values, 10000, "The number of values to use for tests");
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace container_internal {
namespace {
using ::absl::test_internal::CopyableMovableInstance;
using ::absl::test_internal::InstanceTracker;
using ::absl::test_internal::MovableOnlyInstance;
using ::testing::ElementsAre;
using ::testing::ElementsAreArray;
using ::testing::IsEmpty;
using ::testing::IsNull;
using ::testing::Pair;
using ::testing::SizeIs;
template <typename T, typename U>
void CheckPairEquals(const T &x, const U &y) {
ABSL_INTERNAL_CHECK(x == y, "Values are unequal.");
}
template <typename T, typename U, typename V, typename W>
void CheckPairEquals(const std::pair<T, U> &x, const std::pair<V, W> &y) {
CheckPairEquals(x.first, y.first);
CheckPairEquals(x.second, y.second);
}
} // namespace
// The base class for a sorted associative container checker. TreeType is the
// container type to check and CheckerType is the container type to check
// against. TreeType is expected to be btree_{set,map,multiset,multimap} and
// CheckerType is expected to be {set,map,multiset,multimap}.
template <typename TreeType, typename CheckerType>
class base_checker {
public:
using key_type = typename TreeType::key_type;
using value_type = typename TreeType::value_type;
using key_compare = typename TreeType::key_compare;
using pointer = typename TreeType::pointer;
using const_pointer = typename TreeType::const_pointer;
using reference = typename TreeType::reference;
using const_reference = typename TreeType::const_reference;
using size_type = typename TreeType::size_type;
using difference_type = typename TreeType::difference_type;
using iterator = typename TreeType::iterator;
using const_iterator = typename TreeType::const_iterator;
using reverse_iterator = typename TreeType::reverse_iterator;
using const_reverse_iterator = typename TreeType::const_reverse_iterator;
public:
base_checker() : const_tree_(tree_) {}
base_checker(const base_checker &other)
: tree_(other.tree_), const_tree_(tree_), checker_(other.checker_) {}
template <typename InputIterator>
base_checker(InputIterator b, InputIterator e)
: tree_(b, e), const_tree_(tree_), checker_(b, e) {}
iterator begin() { return tree_.begin(); }
const_iterator begin() const { return tree_.begin(); }
iterator end() { return tree_.end(); }
const_iterator end() const { return tree_.end(); }
reverse_iterator rbegin() { return tree_.rbegin(); }
const_reverse_iterator rbegin() const { return tree_.rbegin(); }
reverse_iterator rend() { return tree_.rend(); }
const_reverse_iterator rend() const { return tree_.rend(); }
template <typename IterType, typename CheckerIterType>
IterType iter_check(IterType tree_iter, CheckerIterType checker_iter) const {
if (tree_iter == tree_.end()) {
ABSL_INTERNAL_CHECK(checker_iter == checker_.end(),
"Checker iterator not at end.");
} else {
CheckPairEquals(*tree_iter, *checker_iter);
}
return tree_iter;
}
template <typename IterType, typename CheckerIterType>
IterType riter_check(IterType tree_iter, CheckerIterType checker_iter) const {
if (tree_iter == tree_.rend()) {
ABSL_INTERNAL_CHECK(checker_iter == checker_.rend(),
"Checker iterator not at rend.");
} else {
CheckPairEquals(*tree_iter, *checker_iter);
}
return tree_iter;
}
void value_check(const value_type &v) {
typename KeyOfValue<typename TreeType::key_type,
typename TreeType::value_type>::type key_of_value;
const key_type &key = key_of_value(v);
CheckPairEquals(*find(key), v);
lower_bound(key);
upper_bound(key);
equal_range(key);
contains(key);
count(key);
}
void erase_check(const key_type &key) {
EXPECT_FALSE(tree_.contains(key));
EXPECT_EQ(tree_.find(key), const_tree_.end());
EXPECT_FALSE(const_tree_.contains(key));
EXPECT_EQ(const_tree_.find(key), tree_.end());
EXPECT_EQ(tree_.equal_range(key).first,
const_tree_.equal_range(key).second);
}
iterator lower_bound(const key_type &key) {
return iter_check(tree_.lower_bound(key), checker_.lower_bound(key));
}
const_iterator lower_bound(const key_type &key) const {
return iter_check(tree_.lower_bound(key), checker_.lower_bound(key));
}
iterator upper_bound(const key_type &key) {
return iter_check(tree_.upper_bound(key), checker_.upper_bound(key));
}
const_iterator upper_bound(const key_type &key) const {
return iter_check(tree_.upper_bound(key), checker_.upper_bound(key));
}
std::pair<iterator, iterator> equal_range(const key_type &key) {
std::pair<typename CheckerType::iterator, typename CheckerType::iterator>
checker_res = checker_.equal_range(key);
std::pair<iterator, iterator> tree_res = tree_.equal_range(key);
iter_check(tree_res.first, checker_res.first);
iter_check(tree_res.second, checker_res.second);
return tree_res;
}
std::pair<const_iterator, const_iterator> equal_range(
const key_type &key) const {
std::pair<typename CheckerType::const_iterator,
typename CheckerType::const_iterator>
checker_res = checker_.equal_range(key);
std::pair<const_iterator, const_iterator> tree_res = tree_.equal_range(key);
iter_check(tree_res.first, checker_res.first);
iter_check(tree_res.second, checker_res.second);
return tree_res;
}
iterator find(const key_type &key) {
return iter_check(tree_.find(key), checker_.find(key));
}
const_iterator find(const key_type &key) const {
return iter_check(tree_.find(key), checker_.find(key));
}
bool contains(const key_type &key) const { return find(key) != end(); }
size_type count(const key_type &key) const {
size_type res = checker_.count(key);
EXPECT_EQ(res, tree_.count(key));
return res;
}
base_checker &operator=(const base_checker &other) {
tree_ = other.tree_;
checker_ = other.checker_;
return *this;
}
int erase(const key_type &key) {
int size = tree_.size();
int res = checker_.erase(key);
EXPECT_EQ(res, tree_.count(key));
EXPECT_EQ(res, tree_.erase(key));
EXPECT_EQ(tree_.count(key), 0);
EXPECT_EQ(tree_.size(), size - res);
erase_check(key);
return res;
}
iterator erase(iterator iter) {
key_type key = iter.key();
int size = tree_.size();
int count = tree_.count(key);
auto checker_iter = checker_.lower_bound(key);
for (iterator tmp(tree_.lower_bound(key)); tmp != iter; ++tmp) {
++checker_iter;
}
auto checker_next = checker_iter;
++checker_next;
checker_.erase(checker_iter);
iter = tree_.erase(iter);
EXPECT_EQ(tree_.size(), checker_.size());
EXPECT_EQ(tree_.size(), size - 1);
EXPECT_EQ(tree_.count(key), count - 1);
if (count == 1) {
erase_check(key);
}
return iter_check(iter, checker_next);
}
void erase(iterator begin, iterator end) {
int size = tree_.size();
int count = std::distance(begin, end);
auto checker_begin = checker_.lower_bound(begin.key());
for (iterator tmp(tree_.lower_bound(begin.key())); tmp != begin; ++tmp) {
++checker_begin;
}
auto checker_end =
end == tree_.end() ? checker_.end() : checker_.lower_bound(end.key());
if (end != tree_.end()) {
for (iterator tmp(tree_.lower_bound(end.key())); tmp != end; ++tmp) {
++checker_end;
}
}
const auto checker_ret = checker_.erase(checker_begin, checker_end);
const auto tree_ret = tree_.erase(begin, end);
EXPECT_EQ(std::distance(checker_.begin(), checker_ret),
std::distance(tree_.begin(), tree_ret));
EXPECT_EQ(tree_.size(), checker_.size());
EXPECT_EQ(tree_.size(), size - count);
}
void clear() {
tree_.clear();
checker_.clear();
}
void swap(base_checker &other) {
tree_.swap(other.tree_);
checker_.swap(other.checker_);
}
void verify() const {
tree_.verify();
EXPECT_EQ(tree_.size(), checker_.size());
// Move through the forward iterators using increment.
auto checker_iter = checker_.begin();
const_iterator tree_iter(tree_.begin());
for (; tree_iter != tree_.end(); ++tree_iter, ++checker_iter) {
CheckPairEquals(*tree_iter, *checker_iter);
}
// Move through the forward iterators using decrement.
for (int n = tree_.size() - 1; n >= 0; --n) {
iter_check(tree_iter, checker_iter);
--tree_iter;
--checker_iter;
}
EXPECT_EQ(tree_iter, tree_.begin());
EXPECT_EQ(checker_iter, checker_.begin());
// Move through the reverse iterators using increment.
auto checker_riter = checker_.rbegin();
const_reverse_iterator tree_riter(tree_.rbegin());
for (; tree_riter != tree_.rend(); ++tree_riter, ++checker_riter) {
CheckPairEquals(*tree_riter, *checker_riter);
}
// Move through the reverse iterators using decrement.
for (int n = tree_.size() - 1; n >= 0; --n) {
riter_check(tree_riter, checker_riter);
--tree_riter;
--checker_riter;
}
EXPECT_EQ(tree_riter, tree_.rbegin());
EXPECT_EQ(checker_riter, checker_.rbegin());
}
const TreeType &tree() const { return tree_; }
size_type size() const {
EXPECT_EQ(tree_.size(), checker_.size());
return tree_.size();
}
size_type max_size() const { return tree_.max_size(); }
bool empty() const {
EXPECT_EQ(tree_.empty(), checker_.empty());
return tree_.empty();
}
protected:
TreeType tree_;
const TreeType &const_tree_;
CheckerType checker_;
};
namespace {
// A checker for unique sorted associative containers. TreeType is expected to
// be btree_{set,map} and CheckerType is expected to be {set,map}.
template <typename TreeType, typename CheckerType>
class unique_checker : public base_checker<TreeType, CheckerType> {
using super_type = base_checker<TreeType, CheckerType>;
public:
using iterator = typename super_type::iterator;
using value_type = typename super_type::value_type;
public:
unique_checker() : super_type() {}
unique_checker(const unique_checker &other) : super_type(other) {}
template <class InputIterator>
unique_checker(InputIterator b, InputIterator e) : super_type(b, e) {}
unique_checker &operator=(const unique_checker &) = default;
// Insertion routines.
std::pair<iterator, bool> insert(const value_type &v) {
int size = this->tree_.size();
std::pair<typename CheckerType::iterator, bool> checker_res =
this->checker_.insert(v);
std::pair<iterator, bool> tree_res = this->tree_.insert(v);
CheckPairEquals(*tree_res.first, *checker_res.first);
EXPECT_EQ(tree_res.second, checker_res.second);
EXPECT_EQ(this->tree_.size(), this->checker_.size());
EXPECT_EQ(this->tree_.size(), size + tree_res.second);
return tree_res;
}
iterator insert(iterator position, const value_type &v) {
int size = this->tree_.size();
std::pair<typename CheckerType::iterator, bool> checker_res =
this->checker_.insert(v);
iterator tree_res = this->tree_.insert(position, v);
CheckPairEquals(*tree_res, *checker_res.first);
EXPECT_EQ(this->tree_.size(), this->checker_.size());
EXPECT_EQ(this->tree_.size(), size + checker_res.second);
return tree_res;
}
template <typename InputIterator>
void insert(InputIterator b, InputIterator e) {
for (; b != e; ++b) {
insert(*b);
}
}
};
// A checker for multiple sorted associative containers. TreeType is expected
// to be btree_{multiset,multimap} and CheckerType is expected to be
// {multiset,multimap}.
template <typename TreeType, typename CheckerType>
class multi_checker : public base_checker<TreeType, CheckerType> {
using super_type = base_checker<TreeType, CheckerType>;
public:
using iterator = typename super_type::iterator;
using value_type = typename super_type::value_type;
public:
multi_checker() : super_type() {}
multi_checker(const multi_checker &other) : super_type(other) {}
template <class InputIterator>
multi_checker(InputIterator b, InputIterator e) : super_type(b, e) {}
multi_checker &operator=(const multi_checker &) = default;
// Insertion routines.
iterator insert(const value_type &v) {
int size = this->tree_.size();
auto checker_res = this->checker_.insert(v);
iterator tree_res = this->tree_.insert(v);
CheckPairEquals(*tree_res, *checker_res);
EXPECT_EQ(this->tree_.size(), this->checker_.size());
EXPECT_EQ(this->tree_.size(), size + 1);
return tree_res;
}
iterator insert(iterator position, const value_type &v) {
int size = this->tree_.size();
auto checker_res = this->checker_.insert(v);
iterator tree_res = this->tree_.insert(position, v);
CheckPairEquals(*tree_res, *checker_res);
EXPECT_EQ(this->tree_.size(), this->checker_.size());
EXPECT_EQ(this->tree_.size(), size + 1);
return tree_res;
}
template <typename InputIterator>
void insert(InputIterator b, InputIterator e) {
for (; b != e; ++b) {
insert(*b);
}
}
};
template <typename T, typename V>
void DoTest(const char *name, T *b, const std::vector<V> &values) {
typename KeyOfValue<typename T::key_type, V>::type key_of_value;
T &mutable_b = *b;
const T &const_b = *b;
// Test insert.
for (int i = 0; i < values.size(); ++i) {
mutable_b.insert(values[i]);
mutable_b.value_check(values[i]);
}
ASSERT_EQ(mutable_b.size(), values.size());
const_b.verify();
// Test copy constructor.
T b_copy(const_b);
EXPECT_EQ(b_copy.size(), const_b.size());
for (int i = 0; i < values.size(); ++i) {
CheckPairEquals(*b_copy.find(key_of_value(values[i])), values[i]);
}
// Test range constructor.
T b_range(const_b.begin(), const_b.end());
EXPECT_EQ(b_range.size(), const_b.size());
for (int i = 0; i < values.size(); ++i) {
CheckPairEquals(*b_range.find(key_of_value(values[i])), values[i]);
}
// Test range insertion for values that already exist.
b_range.insert(b_copy.begin(), b_copy.end());
b_range.verify();
// Test range insertion for new values.
b_range.clear();
b_range.insert(b_copy.begin(), b_copy.end());
EXPECT_EQ(b_range.size(), b_copy.size());
for (int i = 0; i < values.size(); ++i) {
CheckPairEquals(*b_range.find(key_of_value(values[i])), values[i]);
}
// Test assignment to self. Nothing should change.
b_range.operator=(b_range);
EXPECT_EQ(b_range.size(), b_copy.size());
// Test assignment of new values.
b_range.clear();
b_range = b_copy;
EXPECT_EQ(b_range.size(), b_copy.size());
// Test swap.
b_range.clear();
b_range.swap(b_copy);
EXPECT_EQ(b_copy.size(), 0);
EXPECT_EQ(b_range.size(), const_b.size());
for (int i = 0; i < values.size(); ++i) {
CheckPairEquals(*b_range.find(key_of_value(values[i])), values[i]);
}
b_range.swap(b_copy);
// Test non-member function swap.
swap(b_range, b_copy);
EXPECT_EQ(b_copy.size(), 0);
EXPECT_EQ(b_range.size(), const_b.size());
for (int i = 0; i < values.size(); ++i) {
CheckPairEquals(*b_range.find(key_of_value(values[i])), values[i]);
}
swap(b_range, b_copy);
// Test erase via values.
for (int i = 0; i < values.size(); ++i) {
mutable_b.erase(key_of_value(values[i]));
// Erasing a non-existent key should have no effect.
ASSERT_EQ(mutable_b.erase(key_of_value(values[i])), 0);
}
const_b.verify();
EXPECT_EQ(const_b.size(), 0);
// Test erase via iterators.
mutable_b = b_copy;
for (int i = 0; i < values.size(); ++i) {
mutable_b.erase(mutable_b.find(key_of_value(values[i])));
}
const_b.verify();
EXPECT_EQ(const_b.size(), 0);
// Test insert with hint.
for (int i = 0; i < values.size(); i++) {
mutable_b.insert(mutable_b.upper_bound(key_of_value(values[i])), values[i]);
}
const_b.verify();
// Test range erase.
mutable_b.erase(mutable_b.begin(), mutable_b.end());
EXPECT_EQ(mutable_b.size(), 0);
const_b.verify();
// First half.
mutable_b = b_copy;
typename T::iterator mutable_iter_end = mutable_b.begin();
for (int i = 0; i < values.size() / 2; ++i) ++mutable_iter_end;
mutable_b.erase(mutable_b.begin(), mutable_iter_end);
EXPECT_EQ(mutable_b.size(), values.size() - values.size() / 2);
const_b.verify();
// Second half.
mutable_b = b_copy;
typename T::iterator mutable_iter_begin = mutable_b.begin();
for (int i = 0; i < values.size() / 2; ++i) ++mutable_iter_begin;
mutable_b.erase(mutable_iter_begin, mutable_b.end());
EXPECT_EQ(mutable_b.size(), values.size() / 2);
const_b.verify();
// Second quarter.
mutable_b = b_copy;
mutable_iter_begin = mutable_b.begin();
for (int i = 0; i < values.size() / 4; ++i) ++mutable_iter_begin;
mutable_iter_end = mutable_iter_begin;
for (int i = 0; i < values.size() / 4; ++i) ++mutable_iter_end;
mutable_b.erase(mutable_iter_begin, mutable_iter_end);
EXPECT_EQ(mutable_b.size(), values.size() - values.size() / 4);
const_b.verify();
mutable_b.clear();
}
template <typename T>
void ConstTest() {
using value_type = typename T::value_type;
typename KeyOfValue<typename T::key_type, value_type>::type key_of_value;
T mutable_b;
const T &const_b = mutable_b;
// Insert a single value into the container and test looking it up.
value_type value = Generator<value_type>(2)(2);
mutable_b.insert(value);
EXPECT_TRUE(mutable_b.contains(key_of_value(value)));
EXPECT_NE(mutable_b.find(key_of_value(value)), const_b.end());
EXPECT_TRUE(const_b.contains(key_of_value(value)));
EXPECT_NE(const_b.find(key_of_value(value)), mutable_b.end());
EXPECT_EQ(*const_b.lower_bound(key_of_value(value)), value);
EXPECT_EQ(const_b.upper_bound(key_of_value(value)), const_b.end());
EXPECT_EQ(*const_b.equal_range(key_of_value(value)).first, value);
// We can only create a non-const iterator from a non-const container.
typename T::iterator mutable_iter(mutable_b.begin());
EXPECT_EQ(mutable_iter, const_b.begin());
EXPECT_NE(mutable_iter, const_b.end());
EXPECT_EQ(const_b.begin(), mutable_iter);
EXPECT_NE(const_b.end(), mutable_iter);
typename T::reverse_iterator mutable_riter(mutable_b.rbegin());
EXPECT_EQ(mutable_riter, const_b.rbegin());
EXPECT_NE(mutable_riter, const_b.rend());
EXPECT_EQ(const_b.rbegin(), mutable_riter);
EXPECT_NE(const_b.rend(), mutable_riter);
// We can create a const iterator from a non-const iterator.
typename T::const_iterator const_iter(mutable_iter);
EXPECT_EQ(const_iter, mutable_b.begin());
EXPECT_NE(const_iter, mutable_b.end());
EXPECT_EQ(mutable_b.begin(), const_iter);
EXPECT_NE(mutable_b.end(), const_iter);
typename T::const_reverse_iterator const_riter(mutable_riter);
EXPECT_EQ(const_riter, mutable_b.rbegin());
EXPECT_NE(const_riter, mutable_b.rend());
EXPECT_EQ(mutable_b.rbegin(), const_riter);
EXPECT_NE(mutable_b.rend(), const_riter);
// Make sure various methods can be invoked on a const container.
const_b.verify();
ASSERT_TRUE(!const_b.empty());
EXPECT_EQ(const_b.size(), 1);
EXPECT_GT(const_b.max_size(), 0);
EXPECT_TRUE(const_b.contains(key_of_value(value)));
EXPECT_EQ(const_b.count(key_of_value(value)), 1);
}
template <typename T, typename C>
void BtreeTest() {
ConstTest<T>();
using V = typename remove_pair_const<typename T::value_type>::type;
const std::vector<V> random_values = GenerateValuesWithSeed<V>(
absl::GetFlag(FLAGS_test_values), 4 * absl::GetFlag(FLAGS_test_values),
GTEST_FLAG_GET(random_seed));
unique_checker<T, C> container;
// Test key insertion/deletion in sorted order.
std::vector<V> sorted_values(random_values);
std::sort(sorted_values.begin(), sorted_values.end());
DoTest("sorted: ", &container, sorted_values);
// Test key insertion/deletion in reverse sorted order.
std::reverse(sorted_values.begin(), sorted_values.end());
DoTest("rsorted: ", &container, sorted_values);
// Test key insertion/deletion in random order.
DoTest("random: ", &container, random_values);
}
template <typename T, typename C>
void BtreeMultiTest() {
ConstTest<T>();
using V = typename remove_pair_const<typename T::value_type>::type;
const std::vector<V> random_values = GenerateValuesWithSeed<V>(
absl::GetFlag(FLAGS_test_values), 4 * absl::GetFlag(FLAGS_test_values),
GTEST_FLAG_GET(random_seed));
multi_checker<T, C> container;
// Test keys in sorted order.
std::vector<V> sorted_values(random_values);
std::sort(sorted_values.begin(), sorted_values.end());
DoTest("sorted: ", &container, sorted_values);
// Test keys in reverse sorted order.
std::reverse(sorted_values.begin(), sorted_values.end());
DoTest("rsorted: ", &container, sorted_values);
// Test keys in random order.
DoTest("random: ", &container, random_values);
// Test keys in random order w/ duplicates.
std::vector<V> duplicate_values(random_values);
duplicate_values.insert(duplicate_values.end(), random_values.begin(),
random_values.end());
DoTest("duplicates:", &container, duplicate_values);
// Test all identical keys.
std::vector<V> identical_values(100);
std::fill(identical_values.begin(), identical_values.end(),
Generator<V>(2)(2));
DoTest("identical: ", &container, identical_values);
}
template <typename T>
struct PropagatingCountingAlloc : public CountingAllocator<T> {
using propagate_on_container_copy_assignment = std::true_type;
using propagate_on_container_move_assignment = std::true_type;
using propagate_on_container_swap = std::true_type;
using Base = CountingAllocator<T>;
using Base::Base;
template <typename U>
explicit PropagatingCountingAlloc(const PropagatingCountingAlloc<U> &other)
: Base(other.bytes_used_) {}
template <typename U>
struct rebind {
using other = PropagatingCountingAlloc<U>;
};
};
template <typename T>
void BtreeAllocatorTest() {
using value_type = typename T::value_type;
int64_t bytes1 = 0, bytes2 = 0;
PropagatingCountingAlloc<T> allocator1(&bytes1);
PropagatingCountingAlloc<T> allocator2(&bytes2);
Generator<value_type> generator(1000);
// Test that we allocate properly aligned memory. If we don't, then Layout
// will assert fail.
auto unused1 = allocator1.allocate(1);
auto unused2 = allocator2.allocate(1);
// Test copy assignment
{
T b1(typename T::key_compare(), allocator1);
T b2(typename T::key_compare(), allocator2);
int64_t original_bytes1 = bytes1;
b1.insert(generator(0));
EXPECT_GT(bytes1, original_bytes1);
// This should propagate the allocator.
b1 = b2;
EXPECT_EQ(b1.size(), 0);
EXPECT_EQ(b2.size(), 0);
EXPECT_EQ(bytes1, original_bytes1);
for (int i = 1; i < 1000; i++) {
b1.insert(generator(i));
}
// We should have allocated out of allocator2.
EXPECT_GT(bytes2, bytes1);
}
// Test move assignment
{
T b1(typename T::key_compare(), allocator1);
T b2(typename T::key_compare(), allocator2);
int64_t original_bytes1 = bytes1;
b1.insert(generator(0));
EXPECT_GT(bytes1, original_bytes1);
// This should propagate the allocator.
b1 = std::move(b2);
EXPECT_EQ(b1.size(), 0);
EXPECT_EQ(bytes1, original_bytes1);
for (int i = 1; i < 1000; i++) {
b1.insert(generator(i));
}
// We should have allocated out of allocator2.
EXPECT_GT(bytes2, bytes1);
}
// Test swap
{
T b1(typename T::key_compare(), allocator1);
T b2(typename T::key_compare(), allocator2);
int64_t original_bytes1 = bytes1;
b1.insert(generator(0));
EXPECT_GT(bytes1, original_bytes1);
// This should swap the allocators.
swap(b1, b2);
EXPECT_EQ(b1.size(), 0);
EXPECT_EQ(b2.size(), 1);
EXPECT_GT(bytes1, original_bytes1);
for (int i = 1; i < 1000; i++) {
b1.insert(generator(i));
}
// We should have allocated out of allocator2.
EXPECT_GT(bytes2, bytes1);
}
allocator1.deallocate(unused1, 1);
allocator2.deallocate(unused2, 1);
}
template <typename T>
void BtreeMapTest() {
using value_type = typename T::value_type;
using mapped_type = typename T::mapped_type;
mapped_type m = Generator<mapped_type>(0)(0);
(void)m;
T b;
// Verify we can insert using operator[].
for (int i = 0; i < 1000; i++) {
value_type v = Generator<value_type>(1000)(i);
b[v.first] = v.second;
}
EXPECT_EQ(b.size(), 1000);
// Test whether we can use the "->" operator on iterators and
// reverse_iterators. This stresses the btree_map_params::pair_pointer
// mechanism.
EXPECT_EQ(b.begin()->first, Generator<value_type>(1000)(0).first);
EXPECT_EQ(b.begin()->second, Generator<value_type>(1000)(0).second);
EXPECT_EQ(b.rbegin()->first, Generator<value_type>(1000)(999).first);
EXPECT_EQ(b.rbegin()->second, Generator<value_type>(1000)(999).second);
}
template <typename T>
void BtreeMultiMapTest() {
using mapped_type = typename T::mapped_type;
mapped_type m = Generator<mapped_type>(0)(0);
(void)m;
}
template <typename K, int N = 256>
void SetTest() {
EXPECT_EQ(
sizeof(absl::btree_set<K>),
2 * sizeof(void *) + sizeof(typename absl::btree_set<K>::size_type));
using BtreeSet = absl::btree_set<K>;
using CountingBtreeSet =
absl::btree_set<K, std::less<K>, PropagatingCountingAlloc<K>>;
BtreeTest<BtreeSet, std::set<K>>();
BtreeAllocatorTest<CountingBtreeSet>();
}
template <typename K, int N = 256>
void MapTest() {
EXPECT_EQ(
sizeof(absl::btree_map<K, K>),
2 * sizeof(void *) + sizeof(typename absl::btree_map<K, K>::size_type));
using BtreeMap = absl::btree_map<K, K>;
using CountingBtreeMap =
absl::btree_map<K, K, std::less<K>,
PropagatingCountingAlloc<std::pair<const K, K>>>;
BtreeTest<BtreeMap, std::map<K, K>>();
BtreeAllocatorTest<CountingBtreeMap>();
BtreeMapTest<BtreeMap>();
}
TEST(Btree, set_int32) { SetTest<int32_t>(); }
TEST(Btree, set_int64) { SetTest<int64_t>(); }
TEST(Btree, set_string) { SetTest<std::string>(); }
TEST(Btree, set_cord) { SetTest<absl::Cord>(); }
TEST(Btree, set_pair) { SetTest<std::pair<int, int>>(); }
TEST(Btree, map_int32) { MapTest<int32_t>(); }
TEST(Btree, map_int64) { MapTest<int64_t>(); }
TEST(Btree, map_string) { MapTest<std::string>(); }
TEST(Btree, map_cord) { MapTest<absl::Cord>(); }
TEST(Btree, map_pair) { MapTest<std::pair<int, int>>(); }
template <typename K, int N = 256>
void MultiSetTest() {
EXPECT_EQ(
sizeof(absl::btree_multiset<K>),
2 * sizeof(void *) + sizeof(typename absl::btree_multiset<K>::size_type));
using BtreeMSet = absl::btree_multiset<K>;
using CountingBtreeMSet =
absl::btree_multiset<K, std::less<K>, PropagatingCountingAlloc<K>>;
BtreeMultiTest<BtreeMSet, std::multiset<K>>();
BtreeAllocatorTest<CountingBtreeMSet>();
}
template <typename K, int N = 256>
void MultiMapTest() {
EXPECT_EQ(sizeof(absl::btree_multimap<K, K>),
2 * sizeof(void *) +
sizeof(typename absl::btree_multimap<K, K>::size_type));
using BtreeMMap = absl::btree_multimap<K, K>;
using CountingBtreeMMap =
absl::btree_multimap<K, K, std::less<K>,
PropagatingCountingAlloc<std::pair<const K, K>>>;
BtreeMultiTest<BtreeMMap, std::multimap<K, K>>();
BtreeMultiMapTest<BtreeMMap>();
BtreeAllocatorTest<CountingBtreeMMap>();
}
TEST(Btree, multiset_int32) { MultiSetTest<int32_t>(); }
TEST(Btree, multiset_int64) { MultiSetTest<int64_t>(); }
TEST(Btree, multiset_string) { MultiSetTest<std::string>(); }
TEST(Btree, multiset_cord) { MultiSetTest<absl::Cord>(); }
TEST(Btree, multiset_pair) { MultiSetTest<std::pair<int, int>>(); }
TEST(Btree, multimap_int32) { MultiMapTest<int32_t>(); }
TEST(Btree, multimap_int64) { MultiMapTest<int64_t>(); }
TEST(Btree, multimap_string) { MultiMapTest<std::string>(); }
TEST(Btree, multimap_cord) { MultiMapTest<absl::Cord>(); }
TEST(Btree, multimap_pair) { MultiMapTest<std::pair<int, int>>(); }
struct CompareIntToString {
bool operator()(const std::string &a, const std::string &b) const {
return a < b;
}
bool operator()(const std::string &a, int b) const {
return a < absl::StrCat(b);
}
bool operator()(int a, const std::string &b) const {
return absl::StrCat(a) < b;
}
using is_transparent = void;
};
struct NonTransparentCompare {
template <typename T, typename U>
bool operator()(const T &t, const U &u) const {
// Treating all comparators as transparent can cause inefficiencies (see
// N3657 C++ proposal). Test that for comparators without 'is_transparent'
// alias (like this one), we do not attempt heterogeneous lookup.
EXPECT_TRUE((std::is_same<T, U>()));
return t < u;
}
};
template <typename T>
bool CanEraseWithEmptyBrace(T t, decltype(t.erase({})) *) {
return true;
}
template <typename T>
bool CanEraseWithEmptyBrace(T, ...) {
return false;
}
template <typename T>
void TestHeterogeneous(T table) {
auto lb = table.lower_bound("3");
EXPECT_EQ(lb, table.lower_bound(3));
EXPECT_NE(lb, table.lower_bound(4));
EXPECT_EQ(lb, table.lower_bound({"3"}));
EXPECT_NE(lb, table.lower_bound({}));
auto ub = table.upper_bound("3");
EXPECT_EQ(ub, table.upper_bound(3));
EXPECT_NE(ub, table.upper_bound(5));
EXPECT_EQ(ub, table.upper_bound({"3"}));
EXPECT_NE(ub, table.upper_bound({}));
auto er = table.equal_range("3");
EXPECT_EQ(er, table.equal_range(3));
EXPECT_NE(er, table.equal_range(4));
EXPECT_EQ(er, table.equal_range({"3"}));
EXPECT_NE(er, table.equal_range({}));
auto it = table.find("3");
EXPECT_EQ(it, table.find(3));
EXPECT_NE(it, table.find(4));
EXPECT_EQ(it, table.find({"3"}));
EXPECT_NE(it, table.find({}));
EXPECT_TRUE(table.contains(3));
EXPECT_FALSE(table.contains(4));
EXPECT_TRUE(table.count({"3"}));
EXPECT_FALSE(table.contains({}));
EXPECT_EQ(1, table.count(3));
EXPECT_EQ(0, table.count(4));
EXPECT_EQ(1, table.count({"3"}));
EXPECT_EQ(0, table.count({}));
auto copy = table;
copy.erase(3);
EXPECT_EQ(table.size() - 1, copy.size());
copy.erase(4);
EXPECT_EQ(table.size() - 1, copy.size());
copy.erase({"5"});
EXPECT_EQ(table.size() - 2, copy.size());
EXPECT_FALSE(CanEraseWithEmptyBrace(table, nullptr));
// Also run it with const T&.
if (std::is_class<T>()) TestHeterogeneous<const T &>(table);
}
TEST(Btree, HeterogeneousLookup) {
TestHeterogeneous(btree_set<std::string, CompareIntToString>{"1", "3", "5"});
TestHeterogeneous(btree_map<std::string, int, CompareIntToString>{
{"1", 1}, {"3", 3}, {"5", 5}});
TestHeterogeneous(
btree_multiset<std::string, CompareIntToString>{"1", "3", "5"});
TestHeterogeneous(btree_multimap<std::string, int, CompareIntToString>{
{"1", 1}, {"3", 3}, {"5", 5}});
// Only maps have .at()
btree_map<std::string, int, CompareIntToString> map{
{"", -1}, {"1", 1}, {"3", 3}, {"5", 5}};
EXPECT_EQ(1, map.at(1));
EXPECT_EQ(3, map.at({"3"}));
EXPECT_EQ(-1, map.at({}));
const auto &cmap = map;
EXPECT_EQ(1, cmap.at(1));
EXPECT_EQ(3, cmap.at({"3"}));
EXPECT_EQ(-1, cmap.at({}));
}
TEST(Btree, NoHeterogeneousLookupWithoutAlias) {
using StringSet = absl::btree_set<std::string, NonTransparentCompare>;
StringSet s;
ASSERT_TRUE(s.insert("hello").second);
ASSERT_TRUE(s.insert("world").second);
EXPECT_TRUE(s.end() == s.find("blah"));
EXPECT_TRUE(s.begin() == s.lower_bound("hello"));
EXPECT_EQ(1, s.count("world"));
EXPECT_TRUE(s.contains("hello"));
EXPECT_TRUE(s.contains("world"));
EXPECT_FALSE(s.contains("blah"));
using StringMultiSet =
absl::btree_multiset<std::string, NonTransparentCompare>;
StringMultiSet ms;
ms.insert("hello");
ms.insert("world");
ms.insert("world");
EXPECT_TRUE(ms.end() == ms.find("blah"));
EXPECT_TRUE(ms.begin() == ms.lower_bound("hello"));
EXPECT_EQ(2, ms.count("world"));
EXPECT_TRUE(ms.contains("hello"));
EXPECT_TRUE(ms.contains("world"));
EXPECT_FALSE(ms.contains("blah"));
}
TEST(Btree, DefaultTransparent) {