// 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 <cstdint> #include <map> #include <memory> #include <stdexcept> #include <string> #include <type_traits> #include <utility> #include "gmock/gmock.h" #include "gtest/gtest.h" #include "absl/base/internal/raw_logging.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/meta/type_traits.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 { namespace container_internal { namespace { using ::absl::test_internal::InstanceTracker; using ::absl::test_internal::MovableOnlyInstance; using ::testing::ElementsAre; using ::testing::ElementsAreArray; using ::testing::IsEmpty; using ::testing::Pair; 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 &x) : tree_(x.tree_), const_tree_(tree_), checker_(x.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 &x) { typename KeyOfValue<typename TreeType::key_type, typename TreeType::value_type>::type key_of_value; const key_type &key = key_of_value(x); CheckPairEquals(*find(key), x); 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 &x) { tree_ = x.tree_; checker_ = x.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; } } checker_.erase(checker_begin, checker_end); tree_.erase(begin, end); EXPECT_EQ(tree_.size(), checker_.size()); EXPECT_EQ(tree_.size(), size - count); } void clear() { tree_.clear(); checker_.clear(); } void swap(base_checker &x) { tree_.swap(x.tree_); checker_.swap(x.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 &x) : super_type(x) {} 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 &x) { int size = this->tree_.size(); std::pair<typename CheckerType::iterator, bool> checker_res = this->checker_.insert(x); std::pair<iterator, bool> tree_res = this->tree_.insert(x); 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 &x) { int size = this->tree_.size(); std::pair<typename CheckerType::iterator, bool> checker_res = this->checker_.insert(x); iterator tree_res = this->tree_.insert(position, x); 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 &x) : super_type(x) {} 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 &x) { int size = this->tree_.size(); auto checker_res = this->checker_.insert(x); iterator tree_res = this->tree_.insert(x); 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 &x) { int size = this->tree_.size(); auto checker_res = this->checker_.insert(x); iterator tree_res = this->tree_.insert(position, x); 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), testing::GTEST_FLAG(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), testing::GTEST_FLAG(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_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_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_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_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) { { // `int` does not have a default transparent comparator. // The input value is converted to key_type. btree_set<int> s = {1}; double d = 1.1; EXPECT_EQ(s.begin(), s.find(d)); EXPECT_TRUE(s.contains(d)); } { // `std::string` has heterogeneous support. btree_set<std::string> s = {"A"}; EXPECT_EQ(s.begin(), s.find(absl::string_view("A"))); EXPECT_TRUE(s.contains(absl::string_view("A"))); } } class StringLike { public: StringLike() = default; StringLike(const char* s) : s_(s) { // NOLINT ++constructor_calls_; } bool operator<(const StringLike& a) const { return s_ < a.s_; } static void clear_constructor_call_count() { constructor_calls_ = 0; } static int constructor_calls() { return constructor_calls_; } private: static int constructor_calls_; std::string s_; }; int StringLike::constructor_calls_ = 0; TEST(Btree, HeterogeneousLookupDoesntDegradePerformance) { using StringSet = absl::btree_set<StringLike>; StringSet s; for (int i = 0; i < 100; ++i) { ASSERT_TRUE(s.insert(absl::StrCat(i).c_str()).second); } StringLike::clear_constructor_call_count(); s.find("50"); ASSERT_EQ(1, StringLike::constructor_calls()); StringLike::clear_constructor_call_count(); s.contains("50"); ASSERT_EQ(1, StringLike::constructor_calls()); StringLike::clear_constructor_call_count(); s.count("50"); ASSERT_EQ(1, StringLike::constructor_calls()); StringLike::clear_constructor_call_count(); s.lower_bound("50"); ASSERT_EQ(1, StringLike::constructor_calls()); StringLike::clear_constructor_call_count(); s.upper_bound("50"); ASSERT_EQ(1, StringLike::constructor_calls()); StringLike::clear_constructor_call_count(); s.equal_range("50"); ASSERT_EQ(1, StringLike::constructor_calls()); StringLike::clear_constructor_call_count(); s.erase("50"); ASSERT_EQ(1, StringLike::constructor_calls()); } // Verify that swapping btrees swaps the key comparison functors and that we can // use non-default constructible comparators. struct SubstringLess { SubstringLess() = delete; explicit SubstringLess(int length) : n(length) {} bool operator()(const std::string &a, const std::string &b) const { return absl::string_view(a).substr(0, n) < absl::string_view(b).substr(0, n); } int n; }; TEST(Btree, SwapKeyCompare) { using SubstringSet = absl::btree_set<std::string, SubstringLess>; SubstringSet s1(SubstringLess(1), SubstringSet::allocator_type()); SubstringSet s2(SubstringLess(2), SubstringSet::allocator_type()); ASSERT_TRUE(s1.insert("a").second); ASSERT_FALSE(s1.insert("aa").second); ASSERT_TRUE(s2.insert("a").second); ASSERT_TRUE(s2.insert("aa").second); ASSERT_FALSE(s2.insert("aaa").second); swap(s1, s2); ASSERT_TRUE(s1.insert("b").second); ASSERT_TRUE(s1.insert("bb").second); ASSERT_FALSE(s1.insert("bbb").second); ASSERT_TRUE(s2.insert("b").second); ASSERT_FALSE(s2.insert("bb").second); } TEST(Btree, UpperBoundRegression) { // Regress a bug where upper_bound would default-construct a new key_compare // instead of copying the existing one. using SubstringSet = absl::btree_set<std::string, SubstringLess>; SubstringSet my_set(SubstringLess(3)); my_set.insert("aab"); my_set.insert("abb"); // We call upper_bound("aaa"). If this correctly uses the length 3 // comparator, aaa < aab < abb, so we should get aab as the result. // If it instead uses the default-constructed length 2 comparator, // aa == aa < ab, so we'll get abb as our result. SubstringSet::iterator it = my_set.upper_bound("aaa"); ASSERT_TRUE(it != my_set.end()); EXPECT_EQ("aab", *it); } TEST(Btree, Comparison) { const int kSetSize = 1201; absl::btree_set<int64_t> my_set; for (int i = 0; i < kSetSize; ++i) { my_set.insert(i); } absl::btree_set<int64_t> my_set_copy(my_set); EXPECT_TRUE(my_set_copy == my_set); EXPECT_TRUE(my_set == my_set_copy); EXPECT_FALSE(my_set_copy != my_set); EXPECT_FALSE(my_set != my_set_copy); my_set.insert(kSetSize); EXPECT_FALSE(my_set_copy == my_set); EXPECT_FALSE(my_set == my_set_copy); EXPECT_TRUE(my_set_copy != my_set); EXPECT_TRUE(my_set != my_set_copy); my_set.erase(kSetSize - 1); EXPECT_FALSE(my_set_copy == my_set); EXPECT_FALSE(my_set == my_set_copy); EXPECT_TRUE(my_set_copy != my_set); EXPECT_TRUE(my_set != my_set_copy); absl::btree_map<std::string, int64_t> my_map; for (int i = 0; i < kSetSize; ++i) { my_map[std::string(i, 'a')] = i; } absl::btree_map<std::string, int64_t> my_map_copy(my_map); EXPECT_TRUE(my_map_copy == my_map); EXPECT_TRUE(my_map == my_map_copy); EXPECT_FALSE(my_map_copy != my_map); EXPECT_FALSE(my_map != my_map_copy); ++my_map_copy[std::string(7, 'a')]; EXPECT_FALSE(my_map_copy == my_map); EXPECT_FALSE(my_map == my_map_copy); EXPECT_TRUE(my_map_copy != my_map); EXPECT_TRUE(my_map != my_map_copy); my_map_copy = my_map; my_map["hello"] = kSetSize; EXPECT_FALSE(my_map_copy == my_map); EXPECT_FALSE(my_map == my_map_copy); EXPECT_TRUE(my_map_copy != my_map); EXPECT_TRUE(my_map != my_map_copy); my_map.erase(std::string(kSetSize - 1, 'a')); EXPECT_FALSE(my_map_copy == my_map); EXPECT_FALSE(my_map == my_map_copy); EXPECT_TRUE(my_map_copy != my_map); EXPECT_TRUE(my_map != my_map_copy); } TEST(Btree, RangeCtorSanity) { std::vector<int> ivec; ivec.push_back(1); std::map<int, int> imap; imap.insert(std::make_pair(1, 2)); absl::btree_multiset<int> tmset(ivec.begin(), ivec.end()); absl::btree_multimap<int, int> tmmap(imap.begin(), imap.end()); absl::btree_set<int> tset(ivec.begin(), ivec.end()); absl::btree_map<int, int> tmap(imap.begin(), imap.end()); EXPECT_EQ(1, tmset.size()); EXPECT_EQ(1, tmmap.size()); EXPECT_EQ(1, tset.size()); EXPECT_EQ(1, tmap.size()); } TEST(Btree, BtreeMapCanHoldMoveOnlyTypes) { absl::btree_map<std::string, std::unique_ptr<std::string>> m; std::unique_ptr<std::string> &v = m["A"]; EXPECT_TRUE(v == nullptr); v.reset(new std::string("X")); auto iter = m.find("A"); EXPECT_EQ("X", *iter->second); } TEST(Btree, InitializerListConstructor) { absl::btree_set<std::string> set({"a", "b"}); EXPECT_EQ(set.count("a"), 1); EXPECT_EQ(set.count("b"), 1); absl::btree_multiset<int> mset({1, 1, 4}); EXPECT_EQ(mset.count(1), 2); EXPECT_EQ(mset.count(4), 1); absl::btree_map<int, int> map({{1, 5}, {2, 10}}); EXPECT_EQ(map[1], 5); EXPECT_EQ(map[2], 10); absl::btree_multimap<int, int> mmap({{1, 5}, {1, 10}}); auto range = mmap.equal_range(1); auto it = range.first; ASSERT_NE(it, range.second); EXPECT_EQ(it->second, 5); ASSERT_NE(++it, range.second); EXPECT_EQ(it->second, 10); EXPECT_EQ(++it, range.second); } TEST(Btree, InitializerListInsert) { absl::btree_set<std::string> set; set.insert({"a", "b"}); EXPECT_EQ(set.count("a"), 1); EXPECT_EQ(set.count("b"), 1); absl::btree_multiset<int> mset; mset.insert({1, 1, 4}); EXPECT_EQ(mset.count(1), 2); EXPECT_EQ(mset.count(4), 1); absl::btree_map<int, int> map; map.insert({{1, 5}, {2, 10}}); // Test that inserting one element using an initializer list also works. map.insert({3, 15}); EXPECT_EQ(map[1], 5); EXPECT_EQ(map[2], 10); EXPECT_EQ(map[3], 15); absl::btree_multimap<int, int> mmap; mmap.insert({{1, 5}, {1, 10}}); auto range = mmap.equal_range(1); auto it = range.first; ASSERT_NE(it, range.second); EXPECT_EQ(it->second, 5); ASSERT_NE(++it, range.second); EXPECT_EQ(it->second, 10); EXPECT_EQ(++it, range.second); } template <typename Compare, typename K> void AssertKeyCompareToAdapted() { using Adapted = typename key_compare_to_adapter<Compare>::type; static_assert(!std::is_same<Adapted, Compare>::value, "key_compare_to_adapter should have adapted this comparator."); static_assert( std::is_same<absl::weak_ordering, absl::result_of_t<Adapted(const K &, const K &)>>::value, "Adapted comparator should be a key-compare-to comparator."); } template <typename Compare, typename K> void AssertKeyCompareToNotAdapted() { using Unadapted = typename key_compare_to_adapter<Compare>::type; static_assert( std::is_same<Unadapted, Compare>::value, "key_compare_to_adapter shouldn't have adapted this comparator."); static_assert( std::is_same<bool, absl::result_of_t<Unadapted(const K &, const K &)>>::value, "Un-adapted comparator should return bool."); } TEST(Btree, KeyCompareToAdapter) { AssertKeyCompareToAdapted<std::less<std::string>, std::string>(); AssertKeyCompareToAdapted<std::greater<std::string>, std::string>(); AssertKeyCompareToAdapted<std::less<absl::string_view>, absl::string_view>(); AssertKeyCompareToAdapted<std::greater<absl::string_view>, absl::string_view>(); AssertKeyCompareToNotAdapted<std::less<int>, int>(); AssertKeyCompareToNotAdapted<std::greater<int>, int>(); } TEST(Btree, RValueInsert) { InstanceTracker tracker; absl::btree_set<MovableOnlyInstance> set; set.insert(MovableOnlyInstance(1)); set.insert(MovableOnlyInstance(3)); MovableOnlyInstance two(2); set.insert(set.find(MovableOnlyInstance(3)), std::move(two)); auto it = set.find(MovableOnlyInstance(2)); ASSERT_NE(it, set.end()); ASSERT_NE(++it, set.end()); EXPECT_EQ(it->value(), 3); absl::btree_multiset<MovableOnlyInstance> mset; MovableOnlyInstance zero(0); MovableOnlyInstance zero2(0); mset.insert(std::move(zero)); mset.insert(mset.find(MovableOnlyInstance(0)), std::move(zero2)); EXPECT_EQ(mset.count(MovableOnlyInstance(0)), 2); absl::btree_map<int, MovableOnlyInstance> map; std::pair<const int, MovableOnlyInstance> p1 = {1, MovableOnlyInstance(5)}; std::pair<const int, MovableOnlyInstance> p2 = {2, MovableOnlyInstance(10)}; std::pair<const int, MovableOnlyInstance> p3 = {3, MovableOnlyInstance(15)}; map.insert(std::move(p1)); map.insert(std::move(p3)); map.insert(map.find(3), std::move(p2)); ASSERT_NE(map.find(2), map.end()); EXPECT_EQ(map.find(2)->second.value(), 10); absl::btree_multimap<int, MovableOnlyInstance> mmap; std::pair<const int, MovableOnlyInstance> p4 = {1, MovableOnlyInstance(5)}; std::pair<const int, MovableOnlyInstance> p5 = {1, MovableOnlyInstance(10)}; mmap.insert(std::move(p4)); mmap.insert(mmap.find(1), std::move(p5)); auto range = mmap.equal_range(1); auto it1 = range.first; ASSERT_NE(it1, range.second); EXPECT_EQ(it1->second.value(), 10); ASSERT_NE(++it1, range.second); EXPECT_EQ(it1->second.value(), 5); EXPECT_EQ(++it1, range.second); EXPECT_EQ(tracker.copies(), 0); EXPECT_EQ(tracker.swaps(), 0); } } // namespace class BtreeNodePeer { public: // Yields the size of a leaf node with a specific number of values. template <typename ValueType> constexpr static size_t GetTargetNodeSize(size_t target_values_per_node) { return btree_node< set_params<ValueType, std::less<ValueType>, std::allocator<ValueType>, /*TargetNodeSize=*/256, // This parameter isn't used here. /*Multi=*/false>>::SizeWithNValues(target_values_per_node); } // Yields the number of values in a (non-root) leaf node for this set. template <typename Set> constexpr static size_t GetNumValuesPerNode() { return btree_node<typename Set::params_type>::kNodeValues; } }; namespace { // A btree set with a specific number of values per node. template <typename Key, int TargetValuesPerNode, typename Cmp = std::less<Key>> class SizedBtreeSet : public btree_set_container<btree< set_params<Key, Cmp, std::allocator<Key>, BtreeNodePeer::GetTargetNodeSize<Key>(TargetValuesPerNode), /*Multi=*/false>>> { using Base = typename SizedBtreeSet::btree_set_container; public: SizedBtreeSet() {} using Base::Base; }; template <typename Set> void ExpectOperationCounts(const int expected_moves, const int expected_comparisons, const std::vector<int> &values, InstanceTracker *tracker, Set *set) { for (const int v : values) set->insert(MovableOnlyInstance(v)); set->clear(); EXPECT_EQ(tracker->moves(), expected_moves); EXPECT_EQ(tracker->comparisons(), expected_comparisons); EXPECT_EQ(tracker->copies(), 0); EXPECT_EQ(tracker->swaps(), 0); tracker->ResetCopiesMovesSwaps(); } // Note: when the values in this test change, it is expected to have an impact // on performance. TEST(Btree, MovesComparisonsCopiesSwapsTracking) { InstanceTracker tracker; // Note: this is minimum number of values per node. SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/3> set3; // Note: this is the default number of values per node for a set of int32s // (with 64-bit pointers). SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/61> set61; SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/100> set100; // Don't depend on flags for random values because then the expectations will // fail if the flags change. std::vector<int> values = GenerateValuesWithSeed<int>(10000, 1 << 22, /*seed=*/23); EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set3)>(), 3); EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set61)>(), 61); EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set100)>(), 100); if (sizeof(void *) == 8) { EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<absl::btree_set<int32_t>>(), BtreeNodePeer::GetNumValuesPerNode<decltype(set61)>()); } // Test key insertion/deletion in random order. ExpectOperationCounts(45281, 132551, values, &tracker, &set3); ExpectOperationCounts(386718, 129807, values, &tracker, &set61); ExpectOperationCounts(586761, 130310, values, &tracker, &set100); // Test key insertion/deletion in sorted order. std::sort(values.begin(), values.end()); ExpectOperationCounts(26638, 92134, values, &tracker, &set3); ExpectOperationCounts(20208, 87757, values, &tracker, &set61); ExpectOperationCounts(20124, 96583, values, &tracker, &set100); // Test key insertion/deletion in reverse sorted order. std::reverse(values.begin(), values.end()); ExpectOperationCounts(49951, 119325, values, &tracker, &set3); ExpectOperationCounts(338813, 118266, values, &tracker, &set61); ExpectOperationCounts(534529, 125279, values, &tracker, &set100); } struct MovableOnlyInstanceThreeWayCompare { absl::weak_ordering operator()(const MovableOnlyInstance &a, const MovableOnlyInstance &b) const { return a.compare(b); } }; // Note: when the values in this test change, it is expected to have an impact // on performance. TEST(Btree, MovesComparisonsCopiesSwapsTrackingThreeWayCompare) { InstanceTracker tracker; // Note: this is minimum number of values per node. SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/3, MovableOnlyInstanceThreeWayCompare> set3; // Note: this is the default number of values per node for a set of int32s // (with 64-bit pointers). SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/61, MovableOnlyInstanceThreeWayCompare> set61; SizedBtreeSet<MovableOnlyInstance, /*TargetValuesPerNode=*/100, MovableOnlyInstanceThreeWayCompare> set100; // Don't depend on flags for random values because then the expectations will // fail if the flags change. std::vector<int> values = GenerateValuesWithSeed<int>(10000, 1 << 22, /*seed=*/23); EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set3)>(), 3); EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set61)>(), 61); EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<decltype(set100)>(), 100); if (sizeof(void *) == 8) { EXPECT_EQ(BtreeNodePeer::GetNumValuesPerNode<absl::btree_set<int32_t>>(), BtreeNodePeer::GetNumValuesPerNode<decltype(set61)>()); } // Test key insertion/deletion in random order. ExpectOperationCounts(45281, 122560, values, &tracker, &set3); ExpectOperationCounts(386718, 119816, values, &tracker, &set61); ExpectOperationCounts(586761, 120319, values, &tracker, &set100); // Test key insertion/deletion in sorted order. std::sort(values.begin(), values.end()); ExpectOperationCounts(26638, 92134, values, &tracker, &set3); ExpectOperationCounts(20208, 87757, values, &tracker, &set61); ExpectOperationCounts(20124, 96583, values, &tracker, &set100); // Test key insertion/deletion in reverse sorted order. std::reverse(values.begin(), values.end()); ExpectOperationCounts(49951, 109326, values, &tracker, &set3); ExpectOperationCounts(338813, 108267, values, &tracker, &set61); ExpectOperationCounts(534529, 115280, values, &tracker, &set100); } struct NoDefaultCtor { int num; explicit NoDefaultCtor(int i) : num(i) {} friend bool operator<(const NoDefaultCtor& a, const NoDefaultCtor& b) { return a.num < b.num; } }; TEST(Btree, BtreeMapCanHoldNoDefaultCtorTypes) { absl::btree_map<NoDefaultCtor, NoDefaultCtor> m; for (int i = 1; i <= 99; ++i) { SCOPED_TRACE(i); EXPECT_TRUE(m.emplace(NoDefaultCtor(i), NoDefaultCtor(100 - i)).second); } EXPECT_FALSE(m.emplace(NoDefaultCtor(78), NoDefaultCtor(0)).second); auto iter99 = m.find(NoDefaultCtor(99)); ASSERT_NE(iter99, m.end()); EXPECT_EQ(iter99->second.num, 1); auto iter1 = m.find(NoDefaultCtor(1)); ASSERT_NE(iter1, m.end()); EXPECT_EQ(iter1->second.num, 99); auto iter50 = m.find(NoDefaultCtor(50)); ASSERT_NE(iter50, m.end()); EXPECT_EQ(iter50->second.num, 50); auto iter25 = m.find(NoDefaultCtor(25)); ASSERT_NE(iter25, m.end()); EXPECT_EQ(iter25->second.num, 75); } TEST(Btree, BtreeMultimapCanHoldNoDefaultCtorTypes) { absl::btree_multimap<NoDefaultCtor, NoDefaultCtor> m; for (int i = 1; i <= 99; ++i) { SCOPED_TRACE(i); m.emplace(NoDefaultCtor(i), NoDefaultCtor(100 - i)); } auto iter99 = m.find(NoDefaultCtor(99)); ASSERT_NE(iter99, m.end()); EXPECT_EQ(iter99->second.num, 1); auto iter1 = m.find(NoDefaultCtor(1)); ASSERT_NE(iter1, m.end()); EXPECT_EQ(iter1->second.num, 99); auto iter50 = m.find(NoDefaultCtor(50)); ASSERT_NE(iter50, m.end()); EXPECT_EQ(iter50->second.num, 50); auto iter25 = m.find(NoDefaultCtor(25)); ASSERT_NE(iter25, m.end()); EXPECT_EQ(iter25->second.num, 75); } TEST(Btree, MapAt) { absl::btree_map<int, int> map = {{1, 2}, {2, 4}}; EXPECT_EQ(map.at(1), 2); EXPECT_EQ(map.at(2), 4); map.at(2) = 8; const absl::btree_map<int, int> &const_map = map; EXPECT_EQ(const_map.at(1), 2); EXPECT_EQ(const_map.at(2), 8); try { map.at(3); FAIL() << "Exception not thrown"; } catch (const std::out_of_range& e) { EXPECT_STREQ(e.what(), "absl::btree_map::at"); } } TEST(Btree, BtreeMultisetEmplace) { const int value_to_insert = 123456; absl::btree_multiset<int> s; auto iter = s.emplace(value_to_insert); ASSERT_NE(iter, s.end()); EXPECT_EQ(*iter, value_to_insert); auto iter2 = s.emplace(value_to_insert); EXPECT_NE(iter2, iter); ASSERT_NE(iter2, s.end()); EXPECT_EQ(*iter2, value_to_insert); auto result = s.equal_range(value_to_insert); EXPECT_EQ(std::distance(result.first, result.second), 2); } TEST(Btree, BtreeMultisetEmplaceHint) { const int value_to_insert = 123456; absl::btree_multiset<int> s; auto iter = s.emplace(value_to_insert); ASSERT_NE(iter, s.end()); EXPECT_EQ(*iter, value_to_insert); auto emplace_iter = s.emplace_hint(iter, value_to_insert); EXPECT_NE(emplace_iter, iter); ASSERT_NE(emplace_iter, s.end()); EXPECT_EQ(*emplace_iter, value_to_insert); } TEST(Btree, BtreeMultimapEmplace) { const int key_to_insert = 123456; const char value0[] = "a"; absl::btree_multimap<int, std::string> s; auto iter = s.emplace(key_to_insert, value0); ASSERT_NE(iter, s.end()); EXPECT_EQ(iter->first, key_to_insert); EXPECT_EQ(iter->second, value0); const char value1[] = "b"; auto iter2 = s.emplace(key_to_insert, value1); EXPECT_NE(iter2, iter); ASSERT_NE(iter2, s.end()); EXPECT_EQ(iter2->first, key_to_insert); EXPECT_EQ(iter2->second, value1); auto result = s.equal_range(key_to_insert); EXPECT_EQ(std::distance(result.first, result.second), 2); } TEST(Btree, BtreeMultimapEmplaceHint) { const int key_to_insert = 123456; const char value0[] = "a"; absl::btree_multimap<int, std::string> s; auto iter = s.emplace(key_to_insert, value0); ASSERT_NE(iter, s.end()); EXPECT_EQ(iter->first, key_to_insert); EXPECT_EQ(iter->second, value0); const char value1[] = "b"; auto emplace_iter = s.emplace_hint(iter, key_to_insert, value1); EXPECT_NE(emplace_iter, iter); ASSERT_NE(emplace_iter, s.end()); EXPECT_EQ(emplace_iter->first, key_to_insert); EXPECT_EQ(emplace_iter->second, value1); } TEST(Btree, ConstIteratorAccessors) { absl::btree_set<int> set; for (int i = 0; i < 100; ++i) { set.insert(i); } auto it = set.cbegin(); auto r_it = set.crbegin(); for (int i = 0; i < 100; ++i, ++it, ++r_it) { ASSERT_EQ(*it, i); ASSERT_EQ(*r_it, 99 - i); } EXPECT_EQ(it, set.cend()); EXPECT_EQ(r_it, set.crend()); } TEST(Btree, StrSplitCompatible) { const absl::btree_set<std::string> split_set = absl::StrSplit("a,b,c", ','); const absl::btree_set<std::string> expected_set = {"a", "b", "c"}; EXPECT_EQ(split_set, expected_set); } // We can't use EXPECT_EQ/etc. to compare absl::weak_ordering because they // convert literal 0 to int and absl::weak_ordering can only be compared with // literal 0. Defining this function allows for avoiding ClangTidy warnings. bool Identity(const bool b) { return b; } TEST(Btree, ValueComp) { absl::btree_set<int> s; EXPECT_TRUE(s.value_comp()(1, 2)); EXPECT_FALSE(s.value_comp()(2, 2)); EXPECT_FALSE(s.value_comp()(2, 1)); absl::btree_map<int, int> m1; EXPECT_TRUE(m1.value_comp()(std::make_pair(1, 0), std::make_pair(2, 0))); EXPECT_FALSE(m1.value_comp()(std::make_pair(2, 0), std::make_pair(2, 0))); EXPECT_FALSE(m1.value_comp()(std::make_pair(2, 0), std::make_pair(1, 0))); absl::btree_map<std::string, int> m2; EXPECT_TRUE(Identity( m2.value_comp()(std::make_pair("a", 0), std::make_pair("b", 0)) < 0)); EXPECT_TRUE(Identity( m2.value_comp()(std::make_pair("b", 0), std::make_pair("b", 0)) == 0)); EXPECT_TRUE(Identity( m2.value_comp()(std::make_pair("b", 0), std::make_pair("a", 0)) > 0)); } TEST(Btree, DefaultConstruction) { absl::btree_set<int> s; absl::btree_map<int, int> m; absl::btree_multiset<int> ms; absl::btree_multimap<int, int> mm; EXPECT_TRUE(s.empty()); EXPECT_TRUE(m.empty()); EXPECT_TRUE(ms.empty()); EXPECT_TRUE(mm.empty()); } TEST(Btree, SwissTableHashable) { static constexpr int kValues = 10000; std::vector<int> values(kValues); std::iota(values.begin(), values.end(), 0); std::vector<std::pair<int, int>> map_values; for (int v : values) map_values.emplace_back(v, -v); using set = absl::btree_set<int>; EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly({ set{}, set{1}, set{2}, set{1, 2}, set{2, 1}, set(values.begin(), values.end()), set(values.rbegin(), values.rend()), })); using mset = absl::btree_multiset<int>; EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly({ mset{}, mset{1}, mset{1, 1}, mset{2}, mset{2, 2}, mset{1, 2}, mset{1, 1, 2}, mset{1, 2, 2}, mset{1, 1, 2, 2}, mset(values.begin(), values.end()), mset(values.rbegin(), values.rend()), })); using map = absl::btree_map<int, int>; EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly({ map{}, map{{1, 0}}, map{{1, 1}}, map{{2, 0}}, map{{2, 2}}, map{{1, 0}, {2, 1}}, map(map_values.begin(), map_values.end()), map(map_values.rbegin(), map_values.rend()), })); using mmap = absl::btree_multimap<int, int>; EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly({ mmap{}, mmap{{1, 0}}, mmap{{1, 1}}, mmap{{1, 0}, {1, 1}}, mmap{{1, 1}, {1, 0}}, mmap{{2, 0}}, mmap{{2, 2}}, mmap{{1, 0}, {2, 1}}, mmap(map_values.begin(), map_values.end()), mmap(map_values.rbegin(), map_values.rend()), })); } TEST(Btree, ComparableSet) { absl::btree_set<int> s1 = {1, 2}; absl::btree_set<int> s2 = {2, 3}; EXPECT_LT(s1, s2); EXPECT_LE(s1, s2); EXPECT_LE(s1, s1); EXPECT_GT(s2, s1); EXPECT_GE(s2, s1); EXPECT_GE(s1, s1); } TEST(Btree, ComparableSetsDifferentLength) { absl::btree_set<int> s1 = {1, 2}; absl::btree_set<int> s2 = {1, 2, 3}; EXPECT_LT(s1, s2); EXPECT_LE(s1, s2); EXPECT_GT(s2, s1); EXPECT_GE(s2, s1); } TEST(Btree, ComparableMultiset) { absl::btree_multiset<int> s1 = {1, 2}; absl::btree_multiset<int> s2 = {2, 3}; EXPECT_LT(s1, s2); EXPECT_LE(s1, s2); EXPECT_LE(s1, s1); EXPECT_GT(s2, s1); EXPECT_GE(s2, s1); EXPECT_GE(s1, s1); } TEST(Btree, ComparableMap) { absl::btree_map<int, int> s1 = {{1, 2}}; absl::btree_map<int, int> s2 = {{2, 3}}; EXPECT_LT(s1, s2); EXPECT_LE(s1, s2); EXPECT_LE(s1, s1); EXPECT_GT(s2, s1); EXPECT_GE(s2, s1); EXPECT_GE(s1, s1); } TEST(Btree, ComparableMultimap) { absl::btree_multimap<int, int> s1 = {{1, 2}}; absl::btree_multimap<int, int> s2 = {{2, 3}}; EXPECT_LT(s1, s2); EXPECT_LE(s1, s2); EXPECT_LE(s1, s1); EXPECT_GT(s2, s1); EXPECT_GE(s2, s1); EXPECT_GE(s1, s1); } TEST(Btree, ComparableSetWithCustomComparator) { // As specified by // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3337.pdf section // [container.requirements.general].12, ordering associative containers always // uses default '<' operator // - even if otherwise the container uses custom functor. absl::btree_set<int, std::greater<int>> s1 = {1, 2}; absl::btree_set<int, std::greater<int>> s2 = {2, 3}; EXPECT_LT(s1, s2); EXPECT_LE(s1, s2); EXPECT_LE(s1, s1); EXPECT_GT(s2, s1); EXPECT_GE(s2, s1); EXPECT_GE(s1, s1); } TEST(Btree, EraseReturnsIterator) { absl::btree_set<int> set = {1, 2, 3, 4, 5}; auto result_it = set.erase(set.begin(), set.find(3)); EXPECT_EQ(result_it, set.find(3)); result_it = set.erase(set.find(5)); EXPECT_EQ(result_it, set.end()); } TEST(Btree, ExtractAndInsertNodeHandleSet) { absl::btree_set<int> src1 = {1, 2, 3, 4, 5}; auto nh = src1.extract(src1.find(3)); EXPECT_THAT(src1, ElementsAre(1, 2, 4, 5)); absl::btree_set<int> other; absl::btree_set<int>::insert_return_type res = other.insert(std::move(nh)); EXPECT_THAT(other, ElementsAre(3)); EXPECT_EQ(res.position, other.find(3)); EXPECT_TRUE(res.inserted); EXPECT_TRUE(res.node.empty()); absl::btree_set<int> src2 = {3, 4}; nh = src2.extract(src2.find(3)); EXPECT_THAT(src2, ElementsAre(4)); res = other.insert(std::move(nh)); EXPECT_THAT(other, ElementsAre(3)); EXPECT_EQ(res.position, other.find(3)); EXPECT_FALSE(res.inserted); ASSERT_FALSE(res.node.empty()); EXPECT_EQ(res.node.value(), 3); } struct Deref { bool operator()(const std::unique_ptr<int> &lhs, const std::unique_ptr<int> &rhs) const { return *lhs < *rhs; } }; TEST(Btree, ExtractWithUniquePtr) { absl::btree_set<std::unique_ptr<int>, Deref> s; s.insert(absl::make_unique<int>(1)); s.insert(absl::make_unique<int>(2)); s.insert(absl::make_unique<int>(3)); s.insert(absl::make_unique<int>(4)); s.insert(absl::make_unique<int>(5)); auto nh = s.extract(s.find(absl::make_unique<int>(3))); EXPECT_EQ(s.size(), 4); EXPECT_EQ(*nh.value(), 3); s.insert(std::move(nh)); EXPECT_EQ(s.size(), 5); } TEST(Btree, ExtractAndInsertNodeHandleMultiSet) { absl::btree_multiset<int> src1 = {1, 2, 3, 3, 4, 5}; auto nh = src1.extract(src1.find(3)); EXPECT_THAT(src1, ElementsAre(1, 2, 3, 4, 5)); absl::btree_multiset<int> other; auto res = other.insert(std::move(nh)); EXPECT_THAT(other, ElementsAre(3)); EXPECT_EQ(res, other.find(3)); absl::btree_multiset<int> src2 = {3, 4}; nh = src2.extract(src2.find(3)); EXPECT_THAT(src2, ElementsAre(4)); res = other.insert(std::move(nh)); EXPECT_THAT(other, ElementsAre(3, 3)); EXPECT_EQ(res, ++other.find(3)); } TEST(Btree, ExtractAndInsertNodeHandleMap) { absl::btree_map<int, int> src1 = {{1, 2}, {3, 4}, {5, 6}}; auto nh = src1.extract(src1.find(3)); EXPECT_THAT(src1, ElementsAre(Pair(1, 2), Pair(5, 6))); absl::btree_map<int, int> other; absl::btree_map<int, int>::insert_return_type res = other.insert(std::move(nh)); EXPECT_THAT(other, ElementsAre(Pair(3, 4))); EXPECT_EQ(res.position, other.find(3)); EXPECT_TRUE(res.inserted); EXPECT_TRUE(res.node.empty()); absl::btree_map<int, int> src2 = {{3, 6}}; nh = src2.extract(src2.find(3)); EXPECT_TRUE(src2.empty()); res = other.insert(std::move(nh)); EXPECT_THAT(other, ElementsAre(Pair(3, 4))); EXPECT_EQ(res.position, other.find(3)); EXPECT_FALSE(res.inserted); ASSERT_FALSE(res.node.empty()); EXPECT_EQ(res.node.key(), 3); EXPECT_EQ(res.node.mapped(), 6); } TEST(Btree, ExtractAndInsertNodeHandleMultiMap) { absl::btree_multimap<int, int> src1 = {{1, 2}, {3, 4}, {5, 6}}; auto nh = src1.extract(src1.find(3)); EXPECT_THAT(src1, ElementsAre(Pair(1, 2), Pair(5, 6))); absl::btree_multimap<int, int> other; auto res = other.insert(std::move(nh)); EXPECT_THAT(other, ElementsAre(Pair(3, 4))); EXPECT_EQ(res, other.find(3)); absl::btree_multimap<int, int> src2 = {{3, 6}}; nh = src2.extract(src2.find(3)); EXPECT_TRUE(src2.empty()); res = other.insert(std::move(nh)); EXPECT_THAT(other, ElementsAre(Pair(3, 4), Pair(3, 6))); EXPECT_EQ(res, ++other.begin()); } // For multisets, insert with hint also affects correctness because we need to // insert immediately before the hint if possible. struct InsertMultiHintData { int key; int not_key; bool operator==(const InsertMultiHintData other) const { return key == other.key && not_key == other.not_key; } }; struct InsertMultiHintDataKeyCompare { using is_transparent = void; bool operator()(const InsertMultiHintData a, const InsertMultiHintData b) const { return a.key < b.key; } bool operator()(const int a, const InsertMultiHintData b) const { return a < b.key; } bool operator()(const InsertMultiHintData a, const int b) const { return a.key < b; } }; TEST(Btree, InsertHintNodeHandle) { // For unique sets, insert with hint is just a performance optimization. // Test that insert works correctly when the hint is right or wrong. { absl::btree_set<int> src = {1, 2, 3, 4, 5}; auto nh = src.extract(src.find(3)); EXPECT_THAT(src, ElementsAre(1, 2, 4, 5)); absl::btree_set<int> other = {0, 100}; // Test a correct hint. auto it = other.insert(other.lower_bound(3), std::move(nh)); EXPECT_THAT(other, ElementsAre(0, 3, 100)); EXPECT_EQ(it, other.find(3)); nh = src.extract(src.find(5)); // Test an incorrect hint. it = other.insert(other.end(), std::move(nh)); EXPECT_THAT(other, ElementsAre(0, 3, 5, 100)); EXPECT_EQ(it, other.find(5)); } absl::btree_multiset<InsertMultiHintData, InsertMultiHintDataKeyCompare> src = {{1, 2}, {3, 4}, {3, 5}}; auto nh = src.extract(src.lower_bound(3)); EXPECT_EQ(nh.value(), (InsertMultiHintData{3, 4})); absl::btree_multiset<InsertMultiHintData, InsertMultiHintDataKeyCompare> other = {{3, 1}, {3, 2}, {3, 3}}; auto it = other.insert(--other.end(), std::move(nh)); EXPECT_THAT( other, ElementsAre(InsertMultiHintData{3, 1}, InsertMultiHintData{3, 2}, InsertMultiHintData{3, 4}, InsertMultiHintData{3, 3})); EXPECT_EQ(it, --(--other.end())); nh = src.extract(src.find(3)); EXPECT_EQ(nh.value(), (InsertMultiHintData{3, 5})); it = other.insert(other.begin(), std::move(nh)); EXPECT_THAT(other, ElementsAre(InsertMultiHintData{3, 5}, InsertMultiHintData{3, 1}, InsertMultiHintData{3, 2}, InsertMultiHintData{3, 4}, InsertMultiHintData{3, 3})); EXPECT_EQ(it, other.begin()); } struct IntCompareToCmp { absl::weak_ordering operator()(int a, int b) const { if (a < b) return absl::weak_ordering::less; if (a > b) return absl::weak_ordering::greater; return absl::weak_ordering::equivalent; } }; TEST(Btree, MergeIntoUniqueContainers) { absl::btree_set<int, IntCompareToCmp> src1 = {1, 2, 3}; absl::btree_multiset<int> src2 = {3, 4, 4, 5}; absl::btree_set<int> dst; dst.merge(src1); EXPECT_TRUE(src1.empty()); EXPECT_THAT(dst, ElementsAre(1, 2, 3)); dst.merge(src2); EXPECT_THAT(src2, ElementsAre(3, 4)); EXPECT_THAT(dst, ElementsAre(1, 2, 3, 4, 5)); } TEST(Btree, MergeIntoUniqueContainersWithCompareTo) { absl::btree_set<int, IntCompareToCmp> src1 = {1, 2, 3}; absl::btree_multiset<int> src2 = {3, 4, 4, 5}; absl::btree_set<int, IntCompareToCmp> dst; dst.merge(src1); EXPECT_TRUE(src1.empty()); EXPECT_THAT(dst, ElementsAre(1, 2, 3)); dst.merge(src2); EXPECT_THAT(src2, ElementsAre(3, 4)); EXPECT_THAT(dst, ElementsAre(1, 2, 3, 4, 5)); } TEST(Btree, MergeIntoMultiContainers) { absl::btree_set<int, IntCompareToCmp> src1 = {1, 2, 3}; absl::btree_multiset<int> src2 = {3, 4, 4, 5}; absl::btree_multiset<int> dst; dst.merge(src1); EXPECT_TRUE(src1.empty()); EXPECT_THAT(dst, ElementsAre(1, 2, 3)); dst.merge(src2); EXPECT_TRUE(src2.empty()); EXPECT_THAT(dst, ElementsAre(1, 2, 3, 3, 4, 4, 5)); } TEST(Btree, MergeIntoMultiContainersWithCompareTo) { absl::btree_set<int, IntCompareToCmp> src1 = {1, 2, 3}; absl::btree_multiset<int> src2 = {3, 4, 4, 5}; absl::btree_multiset<int, IntCompareToCmp> dst; dst.merge(src1); EXPECT_TRUE(src1.empty()); EXPECT_THAT(dst, ElementsAre(1, 2, 3)); dst.merge(src2); EXPECT_TRUE(src2.empty()); EXPECT_THAT(dst, ElementsAre(1, 2, 3, 3, 4, 4, 5)); } TEST(Btree, MergeIntoMultiMapsWithDifferentComparators) { absl::btree_map<int, int, IntCompareToCmp> src1 = {{1, 1}, {2, 2}, {3, 3}}; absl::btree_multimap<int, int, std::greater<int>> src2 = { {5, 5}, {4, 1}, {4, 4}, {3, 2}}; absl::btree_multimap<int, int> dst; dst.merge(src1); EXPECT_TRUE(src1.empty()); EXPECT_THAT(dst, ElementsAre(Pair(1, 1), Pair(2, 2), Pair(3, 3))); dst.merge(src2); EXPECT_TRUE(src2.empty()); EXPECT_THAT(dst, ElementsAre(Pair(1, 1), Pair(2, 2), Pair(3, 3), Pair(3, 2), Pair(4, 1), Pair(4, 4), Pair(5, 5))); } struct KeyCompareToWeakOrdering { template <typename T> absl::weak_ordering operator()(const T &a, const T &b) const { return a < b ? absl::weak_ordering::less : a == b ? absl::weak_ordering::equivalent : absl::weak_ordering::greater; } }; struct KeyCompareToStrongOrdering { template <typename T> absl::strong_ordering operator()(const T &a, const T &b) const { return a < b ? absl::strong_ordering::less : a == b ? absl::strong_ordering::equal : absl::strong_ordering::greater; } }; TEST(Btree, UserProvidedKeyCompareToComparators) { absl::btree_set<int, KeyCompareToWeakOrdering> weak_set = {1, 2, 3}; EXPECT_TRUE(weak_set.contains(2)); EXPECT_FALSE(weak_set.contains(4)); absl::btree_set<int, KeyCompareToStrongOrdering> strong_set = {1, 2, 3}; EXPECT_TRUE(strong_set.contains(2)); EXPECT_FALSE(strong_set.contains(4)); } TEST(Btree, TryEmplaceBasicTest) { absl::btree_map<int, std::string> m; // Should construct a std::string from the literal. m.try_emplace(1, "one"); EXPECT_EQ(1, m.size()); // Try other std::string constructors and const lvalue key. const int key(42); m.try_emplace(key, 3, 'a'); m.try_emplace(2, std::string("two")); EXPECT_TRUE(std::is_sorted(m.begin(), m.end())); EXPECT_THAT(m, ElementsAreArray(std::vector<std::pair<int, std::string>>{ {1, "one"}, {2, "two"}, {42, "aaa"}})); } TEST(Btree, TryEmplaceWithHintWorks) { // Use a counting comparator here to verify that hint is used. int calls = 0; auto cmp = [&calls](int x, int y) { ++calls; return x < y; }; using Cmp = decltype(cmp); absl::btree_map<int, int, Cmp> m(cmp); for (int i = 0; i < 128; ++i) { m.emplace(i, i); } // Sanity check for the comparator calls = 0; m.emplace(127, 127); EXPECT_GE(calls, 4); // Try with begin hint: calls = 0; auto it = m.try_emplace(m.begin(), -1, -1); EXPECT_EQ(129, m.size()); EXPECT_EQ(it, m.begin()); EXPECT_LE(calls, 2); // Try with end hint: calls = 0; std::pair<int, int> pair1024 = {1024, 1024}; it = m.try_emplace(m.end(), pair1024.first, pair1024.second); EXPECT_EQ(130, m.size()); EXPECT_EQ(it, --m.end()); EXPECT_LE(calls, 2); // Try value already present, bad hint; ensure no duplicate added: calls = 0; it = m.try_emplace(m.end(), 16, 17); EXPECT_EQ(130, m.size()); EXPECT_GE(calls, 4); EXPECT_EQ(it, m.find(16)); // Try value already present, hint points directly to it: calls = 0; it = m.try_emplace(it, 16, 17); EXPECT_EQ(130, m.size()); EXPECT_LE(calls, 2); EXPECT_EQ(it, m.find(16)); m.erase(2); EXPECT_EQ(129, m.size()); auto hint = m.find(3); // Try emplace in the middle of two other elements. calls = 0; m.try_emplace(hint, 2, 2); EXPECT_EQ(130, m.size()); EXPECT_LE(calls, 2); EXPECT_TRUE(std::is_sorted(m.begin(), m.end())); } TEST(Btree, TryEmplaceWithBadHint) { absl::btree_map<int, int> m = {{1, 1}, {9, 9}}; // Bad hint (too small), should still emplace: auto it = m.try_emplace(m.begin(), 2, 2); EXPECT_EQ(it, ++m.begin()); EXPECT_THAT(m, ElementsAreArray( std::vector<std::pair<int, int>>{{1, 1}, {2, 2}, {9, 9}})); // Bad hint, too large this time: it = m.try_emplace(++(++m.begin()), 0, 0); EXPECT_EQ(it, m.begin()); EXPECT_THAT(m, ElementsAreArray(std::vector<std::pair<int, int>>{ {0, 0}, {1, 1}, {2, 2}, {9, 9}})); } TEST(Btree, TryEmplaceMaintainsSortedOrder) { absl::btree_map<int, std::string> m; std::pair<int, std::string> pair5 = {5, "five"}; // Test both lvalue & rvalue emplace. m.try_emplace(10, "ten"); m.try_emplace(pair5.first, pair5.second); EXPECT_EQ(2, m.size()); EXPECT_TRUE(std::is_sorted(m.begin(), m.end())); int int100{100}; m.try_emplace(int100, "hundred"); m.try_emplace(1, "one"); EXPECT_EQ(4, m.size()); EXPECT_TRUE(std::is_sorted(m.begin(), m.end())); } TEST(Btree, TryEmplaceWithHintAndNoValueArgsWorks) { absl::btree_map<int, int> m; m.try_emplace(m.end(), 1); EXPECT_EQ(0, m[1]); } TEST(Btree, TryEmplaceWithHintAndMultipleValueArgsWorks) { absl::btree_map<int, std::string> m; m.try_emplace(m.end(), 1, 10, 'a'); EXPECT_EQ(std::string(10, 'a'), m[1]); } TEST(Btree, MoveAssignmentAllocatorPropagation) { InstanceTracker tracker; int64_t bytes1 = 0, bytes2 = 0; PropagatingCountingAlloc<MovableOnlyInstance> allocator1(&bytes1); PropagatingCountingAlloc<MovableOnlyInstance> allocator2(&bytes2); std::less<MovableOnlyInstance> cmp; // Test propagating allocator_type. { absl::btree_set<MovableOnlyInstance, std::less<MovableOnlyInstance>, PropagatingCountingAlloc<MovableOnlyInstance>> set1(cmp, allocator1), set2(cmp, allocator2); for (int i = 0; i < 100; ++i) set1.insert(MovableOnlyInstance(i)); tracker.ResetCopiesMovesSwaps(); set2 = std::move(set1); EXPECT_EQ(tracker.moves(), 0); } // Test non-propagating allocator_type with equal allocators. { absl::btree_set<MovableOnlyInstance, std::less<MovableOnlyInstance>, CountingAllocator<MovableOnlyInstance>> set1(cmp, allocator1), set2(cmp, allocator1); for (int i = 0; i < 100; ++i) set1.insert(MovableOnlyInstance(i)); tracker.ResetCopiesMovesSwaps(); set2 = std::move(set1); EXPECT_EQ(tracker.moves(), 0); } // Test non-propagating allocator_type with different allocators. { absl::btree_set<MovableOnlyInstance, std::less<MovableOnlyInstance>, CountingAllocator<MovableOnlyInstance>> set1(cmp, allocator1), set2(cmp, allocator2); for (int i = 0; i < 100; ++i) set1.insert(MovableOnlyInstance(i)); tracker.ResetCopiesMovesSwaps(); set2 = std::move(set1); EXPECT_GE(tracker.moves(), 100); } } } // namespace } // namespace container_internal } // namespace absl