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#include <library/cpp/testing/gtest/gtest.h>
#include <library/cpp/yt/memory/erased_storage.h>
#include <library/cpp/int128/int128.h>
#include <library/cpp/yt/misc/guid.h>
#include <util/generic/string.h>
#include <util/system/types.h>
#include <vector>
namespace NYT {
namespace {
////////////////////////////////////////////////////////////////////////////////
struct TWithFieldInitalizer
{
// NB: This class is not trivially default constructible.
int Field{};
};
static_assert(!std::is_trivially_default_constructible_v<TWithFieldInitalizer>);
struct TCopyWithSideEffects
{
TCopyWithSideEffects(const TCopyWithSideEffects&)
{ }
};
static_assert(!std::is_trivially_copy_constructible_v<TCopyWithSideEffects>);
struct TWithSubStruct
{
TWithFieldInitalizer Field;
};
class TWithPrivateMembers
{
public:
TWithPrivateMembers() = default;
private:
[[maybe_unused]] std::array<std::byte, 8> Data_;
};
// Overshadow to bind template parameter.
inline constexpr size_t TestSize = 32;
template <class T>
concept CTriviallyErasable = ::NYT::CTriviallyErasable<T, TestSize>;
using TErasedStorage = ::NYT::TErasedStorage<TestSize>;
////////////////////////////////////////////////////////////////////////////////
TEST(TErasedStorageTest, Types)
{
static_assert(CTriviallyErasable<int>);
static_assert(CTriviallyErasable<i32>);
static_assert(CTriviallyErasable<i64>);
static_assert(CTriviallyErasable<i128>);
static_assert(CTriviallyErasable<std::array<i128, 2>>);
static_assert(CTriviallyErasable<TGuid>);
static_assert(CTriviallyErasable<void*>);
static_assert(CTriviallyErasable<double>);
static_assert(CTriviallyErasable<const char*>);
static_assert(CTriviallyErasable<TWithFieldInitalizer>);
static_assert(CTriviallyErasable<TWithSubStruct>);
static_assert(CTriviallyErasable<TWithPrivateMembers>);
static_assert(CTriviallyErasable<char[8]>);
static_assert(!CTriviallyErasable<TString>);
static_assert(!CTriviallyErasable<std::vector<int>>);
static_assert(!CTriviallyErasable<std::array<i128, 3>>);
static_assert(!CTriviallyErasable<int&>);
static_assert(!CTriviallyErasable<const int&>);
static_assert(!CTriviallyErasable<int&&>);
static_assert(!CTriviallyErasable<TCopyWithSideEffects>);
}
TEST(TErasedStorageTest, JustWorks)
{
int var = 42;
TErasedStorage stor(var);
EXPECT_EQ(stor.AsConcrete<int>(), 42);
var = 66;
EXPECT_EQ(stor.AsConcrete<int>(), 42);
}
TEST(TErasedStorageTest, CopyAssign)
{
int var = 42;
TErasedStorage stor(var);
EXPECT_EQ(stor.AsConcrete<int>(), 42);
{
int anotherVar = 77;
stor = TErasedStorage(anotherVar);
}
EXPECT_EQ(stor.AsConcrete<int>(), 77);
double thirdVar = 9.92145214;
stor = TErasedStorage(thirdVar);
EXPECT_DOUBLE_EQ(stor.AsConcrete<double>(), 9.92145214);
}
TEST(TErasedStorageTest, Pointer)
{
TString message("Hello world");
TErasedStorage stor(&message);
EXPECT_EQ(*stor.AsConcrete<TString*>(), TString("Hello world"));
message = "Goodbye world";
EXPECT_EQ(*stor.AsConcrete<TString*>(), "Goodbye world");
}
TEST(TErasedStorageTest, MutateStorage)
{
int var = 0;
TErasedStorage stor(var);
EXPECT_EQ(stor.AsConcrete<int>(), 0);
auto& ref = stor.AsConcrete<int>();
ref = 88;
EXPECT_EQ(stor.AsConcrete<int>(), 88);
}
TEST(TErasedStorageTest, EqualityComparison)
{
struct TWidget
{
alignas(8) int Value;
alignas(16) bool Flag;
} widget{1, false};
TErasedStorage stor1(widget);
TErasedStorage stor2(widget);
EXPECT_EQ(stor1, stor2);
}
////////////////////////////////////////////////////////////////////////////////
} // namespace
} // namespace NYT
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