// 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/container_memory.h"
#include <cstddef>
#include <cstdint>
#include <memory>
#include <tuple>
#include <type_traits>
#include <typeindex>
#include <typeinfo>
#include <utility>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/base/no_destructor.h"
#include "absl/container/internal/test_instance_tracker.h"
#include "absl/meta/type_traits.h"
#include "absl/strings/string_view.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace container_internal {
namespace {
using ::absl::test_internal::CopyableMovableInstance;
using ::absl::test_internal::InstanceTracker;
using ::testing::_;
using ::testing::ElementsAre;
using ::testing::Gt;
using ::testing::Pair;
TEST(Memory, AlignmentLargerThanBase) {
std::allocator<int8_t> alloc;
void* mem = Allocate<2>(&alloc, 3);
EXPECT_EQ(0, reinterpret_cast<uintptr_t>(mem) % 2);
memcpy(mem, "abc", 3);
Deallocate<2>(&alloc, mem, 3);
}
TEST(Memory, AlignmentSmallerThanBase) {
std::allocator<int64_t> alloc;
void* mem = Allocate<2>(&alloc, 3);
EXPECT_EQ(0, reinterpret_cast<uintptr_t>(mem) % 2);
memcpy(mem, "abc", 3);
Deallocate<2>(&alloc, mem, 3);
}
std::map<std::type_index, int>& AllocationMap() {
static absl::NoDestructor<std::map<std::type_index, int>> map;
return *map;
}
template <typename T>
struct TypeCountingAllocator {
TypeCountingAllocator() = default;
template <typename U>
TypeCountingAllocator(const TypeCountingAllocator<U>&) {} // NOLINT
using value_type = T;
T* allocate(size_t n, const void* = nullptr) {
AllocationMap()[typeid(T)] += n;
return std::allocator<T>().allocate(n);
}
void deallocate(T* p, std::size_t n) {
AllocationMap()[typeid(T)] -= n;
return std::allocator<T>().deallocate(p, n);
}
};
TEST(Memory, AllocateDeallocateMatchType) {
TypeCountingAllocator<int> alloc;
void* mem = Allocate<1>(&alloc, 1);
// Verify that it was allocated
EXPECT_THAT(AllocationMap(), ElementsAre(Pair(_, Gt(0))));
Deallocate<1>(&alloc, mem, 1);
// Verify that the deallocation matched.
EXPECT_THAT(AllocationMap(), ElementsAre(Pair(_, 0)));
}
class Fixture : public ::testing::Test {
using Alloc = std::allocator<std::string>;
public:
Fixture() { ptr_ = std::allocator_traits<Alloc>::allocate(*alloc(), 1); }
~Fixture() override {
std::allocator_traits<Alloc>::destroy(*alloc(), ptr_);
std::allocator_traits<Alloc>::deallocate(*alloc(), ptr_, 1);
}
std::string* ptr() { return ptr_; }
Alloc* alloc() { return &alloc_; }
private:
Alloc alloc_;
std::string* ptr_;
};
TEST_F(Fixture, ConstructNoArgs) {
ConstructFromTuple(alloc(), ptr(), std::forward_as_tuple());
EXPECT_EQ(*ptr(), "");
}
TEST_F(Fixture, ConstructOneArg) {
ConstructFromTuple(alloc(), ptr(), std::forward_as_tuple("abcde"));
EXPECT_EQ(*ptr(), "abcde");
}
TEST_F(Fixture, ConstructTwoArg) {
ConstructFromTuple(alloc(), ptr(), std::forward_as_tuple(5, 'a'));
EXPECT_EQ(*ptr(), "aaaaa");
}
TEST(PairArgs, NoArgs) {
EXPECT_THAT(PairArgs(),
Pair(std::forward_as_tuple(), std::forward_as_tuple()));
}
TEST(PairArgs, TwoArgs) {
EXPECT_EQ(
std::make_pair(std::forward_as_tuple(1), std::forward_as_tuple('A')),
PairArgs(1, 'A'));
}
TEST(PairArgs, Pair) {
EXPECT_EQ(
std::make_pair(std::forward_as_tuple(1), std::forward_as_tuple('A')),
PairArgs(std::make_pair(1, 'A')));
}
TEST(PairArgs, Piecewise) {
EXPECT_EQ(
std::make_pair(std::forward_as_tuple(1), std::forward_as_tuple('A')),
PairArgs(std::piecewise_construct, std::forward_as_tuple(1),
std::forward_as_tuple('A')));
}
TEST(WithConstructed, Simple) {
EXPECT_EQ(1, WithConstructed<absl::string_view>(
std::make_tuple(std::string("a")),
[](absl::string_view str) { return str.size(); }));
}
template <class F, class Arg>
decltype(DecomposeValue(std::declval<F>(), std::declval<Arg>()))
DecomposeValueImpl(int, F&& f, Arg&& arg) {
return DecomposeValue(std::forward<F>(f), std::forward<Arg>(arg));
}
template <class F, class Arg>
const char* DecomposeValueImpl(char, F&& f, Arg&& arg) {
return "not decomposable";
}
template <class F, class Arg>
decltype(DecomposeValueImpl(0, std::declval<F>(), std::declval<Arg>()))
TryDecomposeValue(F&& f, Arg&& arg) {
return DecomposeValueImpl(0, std::forward<F>(f), std::forward<Arg>(arg));
}
TEST(DecomposeValue, Decomposable) {
auto f = [](const int& x, int&& y) { // NOLINT
EXPECT_EQ(&x, &y);
EXPECT_EQ(42, x);
return 'A';
};
EXPECT_EQ('A', TryDecomposeValue(f, 42));
}
TEST(DecomposeValue, NotDecomposable) {
auto f = [](void*) {
ADD_FAILURE() << "Must not be called";
return 'A';
};
EXPECT_STREQ("not decomposable", TryDecomposeValue(f, 42));
}
template <class F, class... Args>
decltype(DecomposePair(std::declval<F>(), std::declval<Args>()...))
DecomposePairImpl(int, F&& f, Args&&... args) {
return DecomposePair(std::forward<F>(f), std::forward<Args>(args)...);
}
template <class F, class... Args>
const char* DecomposePairImpl(char, F&& f, Args&&... args) {
return "not decomposable";
}
template <class F, class... Args>
decltype(DecomposePairImpl(0, std::declval<F>(), std::declval<Args>()...))
TryDecomposePair(F&& f, Args&&... args) {
return DecomposePairImpl(0, std::forward<F>(f), std::forward<Args>(args)...);
}
TEST(DecomposePair, Decomposable) {
auto f = [](const int& x, // NOLINT
std::piecewise_construct_t, std::tuple<int&&> k,
std::tuple<double>&& v) {
EXPECT_EQ(&x, &std::get<0>(k));
EXPECT_EQ(42, x);
EXPECT_EQ(0.5, std::get<0>(v));
return 'A';
};
EXPECT_EQ('A', TryDecomposePair(f, 42, 0.5));
EXPECT_EQ('A', TryDecomposePair(f, std::make_pair(42, 0.5)));
EXPECT_EQ('A', TryDecomposePair(f, std::piecewise_construct,
std::make_tuple(42), std::make_tuple(0.5)));
}
TEST(DecomposePair, NotDecomposable) {
auto f = [](...) {
ADD_FAILURE() << "Must not be called";
return 'A';
};
EXPECT_STREQ("not decomposable", TryDecomposePair(f));
EXPECT_STREQ("not decomposable",
TryDecomposePair(f, std::piecewise_construct, std::make_tuple(),
std::make_tuple(0.5)));
}
TEST(MapSlotPolicy, ConstKeyAndValue) {
using slot_policy = map_slot_policy<const CopyableMovableInstance,
const CopyableMovableInstance>;
using slot_type = typename slot_policy::slot_type;
union Slots {
Slots() {}
~Slots() {}
slot_type slots[100];
} slots;
std::allocator<
std::pair<const CopyableMovableInstance, const CopyableMovableInstance>>
alloc;
InstanceTracker tracker;
slot_policy::construct(&alloc, &slots.slots[0], CopyableMovableInstance(1),
CopyableMovableInstance(1));
for (int i = 0; i < 99; ++i) {
slot_policy::transfer(&alloc, &slots.slots[i + 1], &slots.slots[i]);
}
slot_policy::destroy(&alloc, &slots.slots[99]);
EXPECT_EQ(tracker.copies(), 0);
}
TEST(MapSlotPolicy, TransferReturnsTrue) {
{
using slot_policy = map_slot_policy<int, float>;
EXPECT_TRUE(
(std::is_same<decltype(slot_policy::transfer<std::allocator<char>>(
nullptr, nullptr, nullptr)),
std::true_type>::value));
}
{
struct NonRelocatable {
NonRelocatable() = default;
NonRelocatable(NonRelocatable&&) {}
NonRelocatable& operator=(NonRelocatable&&) { return *this; }
void* self = nullptr;
};
EXPECT_FALSE(absl::is_trivially_relocatable<NonRelocatable>::value);
using slot_policy = map_slot_policy<int, NonRelocatable>;
EXPECT_TRUE(
(std::is_same<decltype(slot_policy::transfer<std::allocator<char>>(
nullptr, nullptr, nullptr)),
std::false_type>::value));
}
}
TEST(MapSlotPolicy, DestroyReturnsTrue) {
{
using slot_policy = map_slot_policy<int, float>;
EXPECT_TRUE(
(std::is_same<decltype(slot_policy::destroy<std::allocator<char>>(
nullptr, nullptr)),
std::true_type>::value));
}
{
EXPECT_FALSE(std::is_trivially_destructible<std::unique_ptr<int>>::value);
using slot_policy = map_slot_policy<int, std::unique_ptr<int>>;
EXPECT_TRUE(
(std::is_same<decltype(slot_policy::destroy<std::allocator<char>>(
nullptr, nullptr)),
std::false_type>::value));
}
}
TEST(ApplyTest, TypeErasedApplyToSlotFn) {
size_t x = 7;
auto fn = [](size_t v) { return v * 2; };
EXPECT_EQ((TypeErasedApplyToSlotFn<decltype(fn), size_t>(&fn, &x)), 14);
}
TEST(ApplyTest, TypeErasedDerefAndApplyToSlotFn) {
size_t x = 7;
auto fn = [](size_t v) { return v * 2; };
size_t* x_ptr = &x;
EXPECT_EQ(
(TypeErasedDerefAndApplyToSlotFn<decltype(fn), size_t>(&fn, &x_ptr)), 14);
}
} // namespace
} // namespace container_internal
ABSL_NAMESPACE_END
} // namespace absl
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