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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.
// This file contains a few select absl::Hash tests that, due to their reliance
// on INSTANTIATE_TYPED_TEST_SUITE_P, require a large amount of memory to
// compile. Put new tests in hash_test.cc, not this file.
#include "absl/hash/hash.h"
#include <stddef.h>
#include <algorithm>
#include <deque>
#include <forward_list>
#include <initializer_list>
#include <list>
#include <map>
#include <set>
#include <string>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#include "gtest/gtest.h"
#include "absl/container/btree_map.h"
#include "absl/container/btree_set.h"
#include "absl/container/flat_hash_map.h"
#include "absl/container/flat_hash_set.h"
#include "absl/container/node_hash_map.h"
#include "absl/container/node_hash_set.h"
#include "absl/hash/hash_testing.h"
#include "absl/hash/internal/hash_test.h"
namespace {
using ::absl::hash_test_internal::is_hashable;
using ::absl::hash_test_internal::TypeErasedContainer;
// Dummy type with unordered equality and hashing semantics. This preserves
// input order internally, and is used below to ensure we get test coverage
// for equal sequences with different iteraton orders.
template <typename T>
class UnorderedSequence {
public:
UnorderedSequence() = default;
template <typename TT>
UnorderedSequence(std::initializer_list<TT> l)
: values_(l.begin(), l.end()) {}
template <typename ForwardIterator,
typename std::enable_if<!std::is_integral<ForwardIterator>::value,
bool>::type = true>
UnorderedSequence(ForwardIterator begin, ForwardIterator end)
: values_(begin, end) {}
// one-argument constructor of value type T, to appease older toolchains that
// get confused by one-element initializer lists in some contexts
explicit UnorderedSequence(const T& v) : values_(&v, &v + 1) {}
using value_type = T;
size_t size() const { return values_.size(); }
typename std::vector<T>::const_iterator begin() const {
return values_.begin();
}
typename std::vector<T>::const_iterator end() const { return values_.end(); }
friend bool operator==(const UnorderedSequence& lhs,
const UnorderedSequence& rhs) {
return lhs.size() == rhs.size() &&
std::is_permutation(lhs.begin(), lhs.end(), rhs.begin());
}
friend bool operator!=(const UnorderedSequence& lhs,
const UnorderedSequence& rhs) {
return !(lhs == rhs);
}
template <typename H>
friend H AbslHashValue(H h, const UnorderedSequence& u) {
return H::combine(H::combine_unordered(std::move(h), u.begin(), u.end()),
u.size());
}
private:
std::vector<T> values_;
};
template <typename T>
class HashValueSequenceTest : public testing::Test {};
TYPED_TEST_SUITE_P(HashValueSequenceTest);
TYPED_TEST_P(HashValueSequenceTest, BasicUsage) {
EXPECT_TRUE((is_hashable<TypeParam>::value));
using IntType = typename TypeParam::value_type;
auto a = static_cast<IntType>(0);
auto b = static_cast<IntType>(23);
auto c = static_cast<IntType>(42);
std::vector<TypeParam> exemplars = {
TypeParam(), TypeParam(), TypeParam{a, b, c},
TypeParam{a, c, b}, TypeParam{c, a, b}, TypeParam{a},
TypeParam{a, a}, TypeParam{a, a, a}, TypeParam{a, a, b},
TypeParam{a, b, a}, TypeParam{b, a, a}, TypeParam{a, b},
TypeParam{b, c}};
EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(exemplars));
}
REGISTER_TYPED_TEST_SUITE_P(HashValueSequenceTest, BasicUsage);
using IntSequenceTypes = testing::Types<
std::deque<int>, std::forward_list<int>, std::list<int>, std::vector<int>,
std::vector<bool>, TypeErasedContainer<std::vector<int>>, std::set<int>,
std::multiset<int>, UnorderedSequence<int>,
TypeErasedContainer<UnorderedSequence<int>>, std::unordered_set<int>,
std::unordered_multiset<int>, absl::flat_hash_set<int>,
absl::node_hash_set<int>, absl::btree_set<int>>;
INSTANTIATE_TYPED_TEST_SUITE_P(My, HashValueSequenceTest, IntSequenceTypes);
template <typename T>
class HashValueNestedSequenceTest : public testing::Test {};
TYPED_TEST_SUITE_P(HashValueNestedSequenceTest);
TYPED_TEST_P(HashValueNestedSequenceTest, BasicUsage) {
using T = TypeParam;
using V = typename T::value_type;
std::vector<T> exemplars = {
// empty case
T{},
// sets of empty sets
T{V{}}, T{V{}, V{}}, T{V{}, V{}, V{}},
// multisets of different values
T{V{1}}, T{V{1, 1}, V{1, 1}}, T{V{1, 1, 1}, V{1, 1, 1}, V{1, 1, 1}},
// various orderings of same nested sets
T{V{}, V{1, 2}}, T{V{}, V{2, 1}}, T{V{1, 2}, V{}}, T{V{2, 1}, V{}},
// various orderings of various nested sets, case 2
T{V{1, 2}, V{3, 4}}, T{V{1, 2}, V{4, 3}}, T{V{1, 3}, V{2, 4}},
T{V{1, 3}, V{4, 2}}, T{V{1, 4}, V{2, 3}}, T{V{1, 4}, V{3, 2}},
T{V{2, 3}, V{1, 4}}, T{V{2, 3}, V{4, 1}}, T{V{2, 4}, V{1, 3}},
T{V{2, 4}, V{3, 1}}, T{V{3, 4}, V{1, 2}}, T{V{3, 4}, V{2, 1}}};
EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(exemplars));
}
REGISTER_TYPED_TEST_SUITE_P(HashValueNestedSequenceTest, BasicUsage);
template <typename T>
using TypeErasedSet = TypeErasedContainer<UnorderedSequence<T>>;
using NestedIntSequenceTypes = testing::Types<
std::vector<std::vector<int>>, std::vector<UnorderedSequence<int>>,
std::vector<TypeErasedSet<int>>, UnorderedSequence<std::vector<int>>,
UnorderedSequence<UnorderedSequence<int>>,
UnorderedSequence<TypeErasedSet<int>>, TypeErasedSet<std::vector<int>>,
TypeErasedSet<UnorderedSequence<int>>, TypeErasedSet<TypeErasedSet<int>>>;
INSTANTIATE_TYPED_TEST_SUITE_P(My, HashValueNestedSequenceTest,
NestedIntSequenceTypes);
template <typename T>
class HashValueAssociativeMapTest : public testing::Test {};
TYPED_TEST_SUITE_P(HashValueAssociativeMapTest);
TYPED_TEST_P(HashValueAssociativeMapTest, BasicUsage) {
using M = TypeParam;
using V = typename M::value_type;
std::vector<M> exemplars{M{},
M{V{0, "foo"}},
M{V{1, "foo"}},
M{V{0, "bar"}},
M{V{1, "bar"}},
M{V{0, "foo"}, V{42, "bar"}},
M{V{42, "bar"}, V{0, "foo"}},
M{V{1, "foo"}, V{42, "bar"}},
M{V{1, "foo"}, V{43, "bar"}},
M{V{1, "foo"}, V{43, "baz"}}};
EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(exemplars));
}
REGISTER_TYPED_TEST_SUITE_P(HashValueAssociativeMapTest, BasicUsage);
using AssociativeMapTypes = testing::Types<
std::map<int, std::string>, std::unordered_map<int, std::string>,
absl::flat_hash_map<int, std::string>,
absl::node_hash_map<int, std::string>, absl::btree_map<int, std::string>,
UnorderedSequence<std::pair<const int, std::string>>>;
INSTANTIATE_TYPED_TEST_SUITE_P(My, HashValueAssociativeMapTest,
AssociativeMapTypes);
template <typename T>
class HashValueAssociativeMultimapTest : public testing::Test {};
TYPED_TEST_SUITE_P(HashValueAssociativeMultimapTest);
TYPED_TEST_P(HashValueAssociativeMultimapTest, BasicUsage) {
using MM = TypeParam;
using V = typename MM::value_type;
std::vector<MM> exemplars{MM{},
MM{V{0, "foo"}},
MM{V{1, "foo"}},
MM{V{0, "bar"}},
MM{V{1, "bar"}},
MM{V{0, "foo"}, V{0, "bar"}},
MM{V{0, "bar"}, V{0, "foo"}},
MM{V{0, "foo"}, V{42, "bar"}},
MM{V{1, "foo"}, V{42, "bar"}},
MM{V{1, "foo"}, V{1, "foo"}, V{43, "bar"}},
MM{V{1, "foo"}, V{43, "bar"}, V{1, "foo"}},
MM{V{1, "foo"}, V{43, "baz"}}};
EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(exemplars));
}
REGISTER_TYPED_TEST_SUITE_P(HashValueAssociativeMultimapTest, BasicUsage);
using AssociativeMultimapTypes =
testing::Types<std::multimap<int, std::string>,
std::unordered_multimap<int, std::string>>;
INSTANTIATE_TYPED_TEST_SUITE_P(My, HashValueAssociativeMultimapTest,
AssociativeMultimapTypes);
} // namespace
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