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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/internal/hash_policy_traits.h"
#include <cstddef>
#include <functional>
#include <memory>
#include <new>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/container/internal/container_memory.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace container_internal {
namespace {
using ::testing::MockFunction;
using ::testing::Return;
using ::testing::ReturnRef;
using Alloc = std::allocator<int>;
using Slot = int;
struct PolicyWithoutOptionalOps {
using slot_type = Slot;
using key_type = Slot;
using init_type = Slot;
static std::function<Slot&(Slot*)> element;
static int apply(int v) { return apply_impl(v); }
static std::function<int(int)> apply_impl;
static std::function<Slot&(Slot*)> value;
template <class Hash>
static constexpr HashSlotFn get_hash_slot_fn() {
return nullptr;
}
};
std::function<int(int)> PolicyWithoutOptionalOps::apply_impl;
std::function<Slot&(Slot*)> PolicyWithoutOptionalOps::value;
struct Test : ::testing::Test {
Test() {
PolicyWithoutOptionalOps::apply_impl = [&](int a1) -> int {
return apply.Call(a1);
};
PolicyWithoutOptionalOps::value = [&](Slot* a1) -> Slot& {
return value.Call(a1);
};
}
std::allocator<int> alloc;
int a = 53;
MockFunction<int(int)> apply;
MockFunction<Slot&(Slot*)> value;
};
TEST_F(Test, apply) {
EXPECT_CALL(apply, Call(42)).WillOnce(Return(1337));
EXPECT_EQ(1337, (hash_policy_traits<PolicyWithoutOptionalOps>::apply(42)));
}
TEST_F(Test, value) {
int b = 0;
EXPECT_CALL(value, Call(&a)).WillOnce(ReturnRef(b));
EXPECT_EQ(&b, &hash_policy_traits<PolicyWithoutOptionalOps>::value(&a));
}
struct Hash {
size_t operator()(Slot a) const { return static_cast<size_t>(a) * 5; }
};
struct PolicyNoHashFn {
using slot_type = Slot;
using key_type = Slot;
using init_type = Slot;
static size_t* apply_called_count;
static Slot& element(Slot* slot) { return *slot; }
template <typename Fn>
static size_t apply(const Fn& fn, int v) {
++(*apply_called_count);
return fn(v);
}
template <class Hash>
static constexpr HashSlotFn get_hash_slot_fn() {
return nullptr;
}
};
size_t* PolicyNoHashFn::apply_called_count;
struct PolicyCustomHashFn : PolicyNoHashFn {
template <class Hash>
static constexpr HashSlotFn get_hash_slot_fn() {
return &TypeErasedApplyToSlotFn<Hash, int>;
}
};
TEST(HashTest, PolicyNoHashFn_get_hash_slot_fn) {
size_t apply_called_count = 0;
PolicyNoHashFn::apply_called_count = &apply_called_count;
Hash hasher;
Slot value = 7;
auto* fn = hash_policy_traits<PolicyNoHashFn>::get_hash_slot_fn<Hash>();
EXPECT_NE(fn, nullptr);
EXPECT_EQ(fn(&hasher, &value), hasher(value));
EXPECT_EQ(apply_called_count, 1);
}
TEST(HashTest, PolicyCustomHashFn_get_hash_slot_fn) {
size_t apply_called_count = 0;
PolicyNoHashFn::apply_called_count = &apply_called_count;
Hash hasher;
Slot value = 7;
auto* fn = hash_policy_traits<PolicyCustomHashFn>::get_hash_slot_fn<Hash>();
EXPECT_EQ(fn, PolicyCustomHashFn::get_hash_slot_fn<Hash>());
EXPECT_EQ(fn(&hasher, &value), hasher(value));
EXPECT_EQ(apply_called_count, 0);
}
} // namespace
} // namespace container_internal
ABSL_NAMESPACE_END
} // namespace absl
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