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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
+//
+// http://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/flat_hash_set.h"
+
+#include <vector>
+
+#include "absl/container/internal/hash_generator_testing.h"
+#include "absl/container/internal/unordered_set_constructor_test.h"
+#include "absl/container/internal/unordered_set_lookup_test.h"
+#include "absl/container/internal/unordered_set_modifiers_test.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+namespace container_internal {
+namespace {
+
+using ::absl::container_internal::hash_internal::Enum;
+using ::absl::container_internal::hash_internal::EnumClass;
+using ::testing::Pointee;
+using ::testing::UnorderedElementsAre;
+using ::testing::UnorderedElementsAreArray;
+
+template <class T>
+using Set =
+ absl::flat_hash_set<T, StatefulTestingHash, StatefulTestingEqual, Alloc<T>>;
+
+using SetTypes =
+ ::testing::Types<Set<int>, Set<std::string>, Set<Enum>, Set<EnumClass>>;
+
+INSTANTIATE_TYPED_TEST_CASE_P(FlatHashSet, ConstructorTest, SetTypes);
+INSTANTIATE_TYPED_TEST_CASE_P(FlatHashSet, LookupTest, SetTypes);
+INSTANTIATE_TYPED_TEST_CASE_P(FlatHashSet, ModifiersTest, SetTypes);
+
+TEST(FlatHashSet, EmplaceString) {
+ std::vector<std::string> v = {"a", "b"};
+ absl::flat_hash_set<absl::string_view> hs(v.begin(), v.end());
+ EXPECT_THAT(hs, UnorderedElementsAreArray(v));
+}
+
+TEST(FlatHashSet, BitfieldArgument) {
+ union {
+ int n : 1;
+ };
+ n = 0;
+ absl::flat_hash_set<int> s = {n};
+ s.insert(n);
+ s.insert(s.end(), n);
+ s.insert({n});
+ s.erase(n);
+ s.count(n);
+ s.prefetch(n);
+ s.find(n);
+ s.contains(n);
+ s.equal_range(n);
+}
+
+TEST(FlatHashSet, MergeExtractInsert) {
+ struct Hash {
+ size_t operator()(const std::unique_ptr<int>& p) const { return *p; }
+ };
+ struct Eq {
+ bool operator()(const std::unique_ptr<int>& a,
+ const std::unique_ptr<int>& b) const {
+ return *a == *b;
+ }
+ };
+ absl::flat_hash_set<std::unique_ptr<int>, Hash, Eq> set1, set2;
+ set1.insert(absl::make_unique<int>(7));
+ set1.insert(absl::make_unique<int>(17));
+
+ set2.insert(absl::make_unique<int>(7));
+ set2.insert(absl::make_unique<int>(19));
+
+ EXPECT_THAT(set1, UnorderedElementsAre(Pointee(7), Pointee(17)));
+ EXPECT_THAT(set2, UnorderedElementsAre(Pointee(7), Pointee(19)));
+
+ set1.merge(set2);
+
+ EXPECT_THAT(set1, UnorderedElementsAre(Pointee(7), Pointee(17), Pointee(19)));
+ EXPECT_THAT(set2, UnorderedElementsAre(Pointee(7)));
+
+ auto node = set1.extract(absl::make_unique<int>(7));
+ EXPECT_TRUE(node);
+ EXPECT_THAT(node.value(), Pointee(7));
+ EXPECT_THAT(set1, UnorderedElementsAre(Pointee(17), Pointee(19)));
+
+ auto insert_result = set2.insert(std::move(node));
+ EXPECT_FALSE(node);
+ EXPECT_FALSE(insert_result.inserted);
+ EXPECT_TRUE(insert_result.node);
+ EXPECT_THAT(insert_result.node.value(), Pointee(7));
+ EXPECT_EQ(**insert_result.position, 7);
+ EXPECT_NE(insert_result.position->get(), insert_result.node.value().get());
+ EXPECT_THAT(set2, UnorderedElementsAre(Pointee(7)));
+
+ node = set1.extract(absl::make_unique<int>(17));
+ EXPECT_TRUE(node);
+ EXPECT_THAT(node.value(), Pointee(17));
+ EXPECT_THAT(set1, UnorderedElementsAre(Pointee(19)));
+
+ node.value() = absl::make_unique<int>(23);
+
+ insert_result = set2.insert(std::move(node));
+ EXPECT_FALSE(node);
+ EXPECT_TRUE(insert_result.inserted);
+ EXPECT_FALSE(insert_result.node);
+ EXPECT_EQ(**insert_result.position, 23);
+ EXPECT_THAT(set2, UnorderedElementsAre(Pointee(7), Pointee(23)));
+}
+
+} // namespace
+} // namespace container_internal
+} // namespace absl