diff options
author | Derek Mauro <dmauro@google.com> | 2023-02-27 07:32:56 -0800 |
---|---|---|
committer | Copybara-Service <copybara-worker@google.com> | 2023-02-27 07:33:43 -0800 |
commit | 7b46123329a756ea2ba59fde56af5f7c214364a3 (patch) | |
tree | d2e434bc2a1be1028bf26c6e90ea3f115032827b /absl/meta | |
parent | f2b52372f7f553a4e9b2558daf2d14d3adf484da (diff) |
Remove backfills of some type traits that are now fully supported
PiperOrigin-RevId: 512622121
Change-Id: If90aaf7939062bd475253c372d9d7950c98c7150
Diffstat (limited to 'absl/meta')
-rw-r--r-- | absl/meta/type_traits.h | 386 | ||||
-rw-r--r-- | absl/meta/type_traits_test.cc | 655 |
2 files changed, 21 insertions, 1020 deletions
diff --git a/absl/meta/type_traits.h b/absl/meta/type_traits.h index b1656c39..fb12ba4a 100644 --- a/absl/meta/type_traits.h +++ b/absl/meta/type_traits.h @@ -41,12 +41,6 @@ #include "absl/base/config.h" -// MSVC constructibility traits do not detect destructor properties and so our -// implementations should not use them as a source-of-truth. -#if defined(_MSC_VER) && !defined(__clang__) && !defined(__GNUC__) -#define ABSL_META_INTERNAL_STD_CONSTRUCTION_TRAITS_DONT_CHECK_DESTRUCTION 1 -#endif - // Defines the default alignment. `__STDCPP_DEFAULT_NEW_ALIGNMENT__` is a C++17 // feature. #if defined(__STDCPP_DEFAULT_NEW_ALIGNMENT__) @@ -58,57 +52,8 @@ namespace absl { ABSL_NAMESPACE_BEGIN -// Defined and documented later on in this file. -template <typename T> -struct is_trivially_destructible; - -// Defined and documented later on in this file. -template <typename T> -struct is_trivially_move_assignable; - namespace type_traits_internal { -// Silence MSVC warnings about the destructor being defined as deleted. -#if defined(_MSC_VER) && !defined(__GNUC__) -#pragma warning(push) -#pragma warning(disable : 4624) -#endif // defined(_MSC_VER) && !defined(__GNUC__) - -template <class T> -union SingleMemberUnion { - T t; -}; - -// Restore the state of the destructor warning that was silenced above. -#if defined(_MSC_VER) && !defined(__GNUC__) -#pragma warning(pop) -#endif // defined(_MSC_VER) && !defined(__GNUC__) - -template <class T> -struct IsTriviallyMoveConstructibleObject - : std::integral_constant< - bool, std::is_move_constructible< - type_traits_internal::SingleMemberUnion<T>>::value && - absl::is_trivially_destructible<T>::value> {}; - -template <class T> -struct IsTriviallyCopyConstructibleObject - : std::integral_constant< - bool, std::is_copy_constructible< - type_traits_internal::SingleMemberUnion<T>>::value && - absl::is_trivially_destructible<T>::value> {}; - -template <class T> -struct IsTriviallyMoveAssignableReference : std::false_type {}; - -template <class T> -struct IsTriviallyMoveAssignableReference<T&> - : absl::is_trivially_move_assignable<T>::type {}; - -template <class T> -struct IsTriviallyMoveAssignableReference<T&&> - : absl::is_trivially_move_assignable<T>::type {}; - template <typename... Ts> struct VoidTImpl { using type = void; @@ -157,39 +102,8 @@ template <class To, template <class...> class Op, class... Args> struct is_detected_convertible : is_detected_convertible_impl<void, To, Op, Args...>::type {}; -template <typename T> -using IsCopyAssignableImpl = - decltype(std::declval<T&>() = std::declval<const T&>()); - -template <typename T> -using IsMoveAssignableImpl = decltype(std::declval<T&>() = std::declval<T&&>()); - } // namespace type_traits_internal -// MSVC 19.20 has a regression that causes our workarounds to fail, but their -// std forms now appear to be compliant. -#if defined(_MSC_VER) && !defined(__clang__) && (_MSC_VER >= 1920) - -template <typename T> -using is_copy_assignable = std::is_copy_assignable<T>; - -template <typename T> -using is_move_assignable = std::is_move_assignable<T>; - -#else - -template <typename T> -struct is_copy_assignable : type_traits_internal::is_detected< - type_traits_internal::IsCopyAssignableImpl, T> { -}; - -template <typename T> -struct is_move_assignable : type_traits_internal::is_detected< - type_traits_internal::IsMoveAssignableImpl, T> { -}; - -#endif - // void_t() // // Ignores the type of any its arguments and returns `void`. In general, this @@ -270,246 +184,29 @@ struct is_function bool, !(std::is_reference<T>::value || std::is_const<typename std::add_const<T>::type>::value)> {}; +// is_copy_assignable() +// is_move_assignable() // is_trivially_destructible() -// -// Determines whether the passed type `T` is trivially destructible. -// -// This metafunction is designed to be a drop-in replacement for the C++11 -// `std::is_trivially_destructible()` metafunction for platforms that have -// incomplete C++11 support (such as libstdc++ 4.x). On any platforms that do -// fully support C++11, we check whether this yields the same result as the std -// implementation. -// -// NOTE: the extensions (__has_trivial_xxx) are implemented in gcc (version >= -// 4.3) and clang. Since we are supporting libstdc++ > 4.7, they should always -// be present. These extensions are documented at -// https://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html#Type-Traits. -template <typename T> -struct is_trivially_destructible -#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE - : std::is_trivially_destructible<T> { -#else - : std::integral_constant<bool, __has_trivial_destructor(T) && - std::is_destructible<T>::value> { -#endif -#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE - private: - static constexpr bool compliant = std::is_trivially_destructible<T>::value == - is_trivially_destructible::value; - static_assert(compliant || std::is_trivially_destructible<T>::value, - "Not compliant with std::is_trivially_destructible; " - "Standard: false, Implementation: true"); - static_assert(compliant || !std::is_trivially_destructible<T>::value, - "Not compliant with std::is_trivially_destructible; " - "Standard: true, Implementation: false"); -#endif // ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE -}; - // is_trivially_default_constructible() -// -// Determines whether the passed type `T` is trivially default constructible. -// -// This metafunction is designed to be a drop-in replacement for the C++11 -// `std::is_trivially_default_constructible()` metafunction for platforms that -// have incomplete C++11 support (such as libstdc++ 4.x). On any platforms that -// do fully support C++11, we check whether this yields the same result as the -// std implementation. -// -// NOTE: according to the C++ standard, Section: 20.15.4.3 [meta.unary.prop] -// "The predicate condition for a template specialization is_constructible<T, -// Args...> shall be satisfied if and only if the following variable -// definition would be well-formed for some invented variable t: -// -// T t(declval<Args>()...); -// -// is_trivially_constructible<T, Args...> additionally requires that the -// variable definition does not call any operation that is not trivial. -// For the purposes of this check, the call to std::declval is considered -// trivial." -// -// Notes from https://en.cppreference.com/w/cpp/types/is_constructible: -// In many implementations, is_nothrow_constructible also checks if the -// destructor throws because it is effectively noexcept(T(arg)). Same -// applies to is_trivially_constructible, which, in these implementations, also -// requires that the destructor is trivial. -// GCC bug 51452: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51452 -// LWG issue 2116: http://cplusplus.github.io/LWG/lwg-active.html#2116. -// -// "T obj();" need to be well-formed and not call any nontrivial operation. -// Nontrivially destructible types will cause the expression to be nontrivial. -template <typename T> -struct is_trivially_default_constructible -#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE) - : std::is_trivially_default_constructible<T> { -#else - : std::integral_constant<bool, __has_trivial_constructor(T) && - std::is_default_constructible<T>::value && - is_trivially_destructible<T>::value> { -#endif -#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE) && \ - !defined( \ - ABSL_META_INTERNAL_STD_CONSTRUCTION_TRAITS_DONT_CHECK_DESTRUCTION) - private: - static constexpr bool compliant = - std::is_trivially_default_constructible<T>::value == - is_trivially_default_constructible::value; - static_assert(compliant || std::is_trivially_default_constructible<T>::value, - "Not compliant with std::is_trivially_default_constructible; " - "Standard: false, Implementation: true"); - static_assert(compliant || !std::is_trivially_default_constructible<T>::value, - "Not compliant with std::is_trivially_default_constructible; " - "Standard: true, Implementation: false"); -#endif // ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE -}; - // is_trivially_move_constructible() -// -// Determines whether the passed type `T` is trivially move constructible. -// -// This metafunction is designed to be a drop-in replacement for the C++11 -// `std::is_trivially_move_constructible()` metafunction for platforms that have -// incomplete C++11 support (such as libstdc++ 4.x). On any platforms that do -// fully support C++11, we check whether this yields the same result as the std -// implementation. -// -// NOTE: `T obj(declval<T>());` needs to be well-formed and not call any -// nontrivial operation. Nontrivially destructible types will cause the -// expression to be nontrivial. -template <typename T> -struct is_trivially_move_constructible -#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE) - : std::is_trivially_move_constructible<T> { -#else - : std::conditional< - std::is_object<T>::value && !std::is_array<T>::value, - type_traits_internal::IsTriviallyMoveConstructibleObject<T>, - std::is_reference<T>>::type::type { -#endif -#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE) && \ - !defined( \ - ABSL_META_INTERNAL_STD_CONSTRUCTION_TRAITS_DONT_CHECK_DESTRUCTION) - private: - static constexpr bool compliant = - std::is_trivially_move_constructible<T>::value == - is_trivially_move_constructible::value; - static_assert(compliant || std::is_trivially_move_constructible<T>::value, - "Not compliant with std::is_trivially_move_constructible; " - "Standard: false, Implementation: true"); - static_assert(compliant || !std::is_trivially_move_constructible<T>::value, - "Not compliant with std::is_trivially_move_constructible; " - "Standard: true, Implementation: false"); -#endif // ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE -}; - // is_trivially_copy_constructible() -// -// Determines whether the passed type `T` is trivially copy constructible. -// -// This metafunction is designed to be a drop-in replacement for the C++11 -// `std::is_trivially_copy_constructible()` metafunction for platforms that have -// incomplete C++11 support (such as libstdc++ 4.x). On any platforms that do -// fully support C++11, we check whether this yields the same result as the std -// implementation. -// -// NOTE: `T obj(declval<const T&>());` needs to be well-formed and not call any -// nontrivial operation. Nontrivially destructible types will cause the -// expression to be nontrivial. -template <typename T> -struct is_trivially_copy_constructible - : std::conditional< - std::is_object<T>::value && !std::is_array<T>::value, - type_traits_internal::IsTriviallyCopyConstructibleObject<T>, - std::is_lvalue_reference<T>>::type::type { -#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE) && \ - !defined( \ - ABSL_META_INTERNAL_STD_CONSTRUCTION_TRAITS_DONT_CHECK_DESTRUCTION) - private: - static constexpr bool compliant = - std::is_trivially_copy_constructible<T>::value == - is_trivially_copy_constructible::value; - static_assert(compliant || std::is_trivially_copy_constructible<T>::value, - "Not compliant with std::is_trivially_copy_constructible; " - "Standard: false, Implementation: true"); - static_assert(compliant || !std::is_trivially_copy_constructible<T>::value, - "Not compliant with std::is_trivially_copy_constructible; " - "Standard: true, Implementation: false"); -#endif // ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE -}; - // is_trivially_move_assignable() -// -// Determines whether the passed type `T` is trivially move assignable. -// -// This metafunction is designed to be a drop-in replacement for the C++11 -// `std::is_trivially_move_assignable()` metafunction for platforms that have -// incomplete C++11 support (such as libstdc++ 4.x). On any platforms that do -// fully support C++11, we check whether this yields the same result as the std -// implementation. -// -// NOTE: `is_assignable<T, U>::value` is `true` if the expression -// `declval<T>() = declval<U>()` is well-formed when treated as an unevaluated -// operand. `is_trivially_assignable<T, U>` requires the assignment to call no -// operation that is not trivial. `is_trivially_copy_assignable<T>` is simply -// `is_trivially_assignable<T&, T>`. -template <typename T> -struct is_trivially_move_assignable - : std::conditional< - std::is_object<T>::value && !std::is_array<T>::value && - std::is_move_assignable<T>::value, - std::is_move_assignable<type_traits_internal::SingleMemberUnion<T>>, - type_traits_internal::IsTriviallyMoveAssignableReference<T>>::type:: - type { -#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE - private: - static constexpr bool compliant = - std::is_trivially_move_assignable<T>::value == - is_trivially_move_assignable::value; - static_assert(compliant || std::is_trivially_move_assignable<T>::value, - "Not compliant with std::is_trivially_move_assignable; " - "Standard: false, Implementation: true"); - static_assert(compliant || !std::is_trivially_move_assignable<T>::value, - "Not compliant with std::is_trivially_move_assignable; " - "Standard: true, Implementation: false"); -#endif // ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE -}; - // is_trivially_copy_assignable() // -// Determines whether the passed type `T` is trivially copy assignable. -// -// This metafunction is designed to be a drop-in replacement for the C++11 -// `std::is_trivially_copy_assignable()` metafunction for platforms that have -// incomplete C++11 support (such as libstdc++ 4.x). On any platforms that do -// fully support C++11, we check whether this yields the same result as the std -// implementation. -// -// NOTE: `is_assignable<T, U>::value` is `true` if the expression -// `declval<T>() = declval<U>()` is well-formed when treated as an unevaluated -// operand. `is_trivially_assignable<T, U>` requires the assignment to call no -// operation that is not trivial. `is_trivially_copy_assignable<T>` is simply -// `is_trivially_assignable<T&, const T&>`. -template <typename T> -struct is_trivially_copy_assignable -#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE - : std::is_trivially_copy_assignable<T> { -#else - : std::integral_constant< - bool, __has_trivial_assign(typename std::remove_reference<T>::type) && - absl::is_copy_assignable<T>::value> { -#endif -#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE - private: - static constexpr bool compliant = - std::is_trivially_copy_assignable<T>::value == - is_trivially_copy_assignable::value; - static_assert(compliant || std::is_trivially_copy_assignable<T>::value, - "Not compliant with std::is_trivially_copy_assignable; " - "Standard: false, Implementation: true"); - static_assert(compliant || !std::is_trivially_copy_assignable<T>::value, - "Not compliant with std::is_trivially_copy_assignable; " - "Standard: true, Implementation: false"); -#endif // ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE -}; +// Historical note: Abseil once provided implementations of these type traits +// for platforms that lacked full support. New code should prefer to use the +// std variants. +// +// See the documentation for the STL <type_traits> header for more information: +// https://en.cppreference.com/w/cpp/header/type_traits +using std::is_copy_assignable; +using std::is_move_assignable; +using std::is_trivially_copy_assignable; +using std::is_trivially_copy_constructible; +using std::is_trivially_default_constructible; +using std::is_trivially_destructible; +using std::is_trivially_move_assignable; +using std::is_trivially_move_constructible; #if defined(__cpp_lib_remove_cvref) && __cpp_lib_remove_cvref >= 201711L template <typename T> @@ -533,52 +230,11 @@ using remove_cvref_t = typename remove_cvref<T>::type; #endif namespace type_traits_internal { -// is_trivially_copyable() -// -// Determines whether the passed type `T` is trivially copyable. -// -// This metafunction is designed to be a drop-in replacement for the C++11 -// `std::is_trivially_copyable()` metafunction for platforms that have -// incomplete C++11 support (such as libstdc++ 4.x). We use the C++17 definition -// of TriviallyCopyable. -// -// NOTE: `is_trivially_copyable<T>::value` is `true` if all of T's copy/move -// constructors/assignment operators are trivial or deleted, T has at least -// one non-deleted copy/move constructor/assignment operator, and T is trivially -// destructible. Arrays of trivially copyable types are trivially copyable. -// -// We expose this metafunction only for internal use within absl. - -#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE) -template <typename T> -struct is_trivially_copyable : std::is_trivially_copyable<T> {}; -#else -template <typename T> -class is_trivially_copyable_impl { - using ExtentsRemoved = typename std::remove_all_extents<T>::type; - static constexpr bool kIsCopyOrMoveConstructible = - std::is_copy_constructible<ExtentsRemoved>::value || - std::is_move_constructible<ExtentsRemoved>::value; - static constexpr bool kIsCopyOrMoveAssignable = - absl::is_copy_assignable<ExtentsRemoved>::value || - absl::is_move_assignable<ExtentsRemoved>::value; - - public: - static constexpr bool kValue = - (__has_trivial_copy(ExtentsRemoved) || !kIsCopyOrMoveConstructible) && - (__has_trivial_assign(ExtentsRemoved) || !kIsCopyOrMoveAssignable) && - (kIsCopyOrMoveConstructible || kIsCopyOrMoveAssignable) && - is_trivially_destructible<ExtentsRemoved>::value && - // We need to check for this explicitly because otherwise we'll say - // references are trivial copyable when compiled by MSVC. - !std::is_reference<ExtentsRemoved>::value; -}; - -template <typename T> -struct is_trivially_copyable - : std::integral_constant< - bool, type_traits_internal::is_trivially_copyable_impl<T>::kValue> {}; -#endif +// An implementation of std::is_trivially_copyable was once provided for +// internal use within absl. +// TODO(absl-team): Replace absl::type_traits_internal::is_trivially_copyable +// with std::is_trivially_copyable and delete this using declaration. +using std::is_trivially_copyable; } // namespace type_traits_internal // ----------------------------------------------------------------------------- diff --git a/absl/meta/type_traits_test.cc b/absl/meta/type_traits_test.cc index b2a7a67b..4165fef5 100644 --- a/absl/meta/type_traits_test.cc +++ b/absl/meta/type_traits_test.cc @@ -352,29 +352,6 @@ class Base { virtual ~Base() {} }; -// Old versions of libc++, around Clang 3.5 to 3.6, consider deleted destructors -// as also being trivial. With the resolution of CWG 1928 and CWG 1734, this -// is no longer considered true and has thus been amended. -// Compiler Explorer: https://godbolt.org/g/zT59ZL -// CWG issue 1734: http://open-std.org/JTC1/SC22/WG21/docs/cwg_defects.html#1734 -// CWG issue 1928: http://open-std.org/JTC1/SC22/WG21/docs/cwg_closed.html#1928 -#if !defined(_LIBCPP_VERSION) || _LIBCPP_VERSION >= 3700 -#define ABSL_TRIVIALLY_DESTRUCTIBLE_CONSIDER_DELETED_DESTRUCTOR_NOT_TRIVIAL 1 -#endif - -// As of the moment, GCC versions >5.1 have a problem compiling for -// std::is_trivially_default_constructible<NontrivialDestructor[10]>, where -// NontrivialDestructor is a struct with a custom nontrivial destructor. Note -// that this problem only occurs for arrays of a known size, so something like -// std::is_trivially_default_constructible<NontrivialDestructor[]> does not -// have any problems. -// Compiler Explorer: https://godbolt.org/g/dXRbdK -// GCC bug 83689: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83689 -#if defined(__clang__) || defined(_MSC_VER) || \ - (defined(__GNUC__) && __GNUC__ < 5) -#define ABSL_GCC_BUG_TRIVIALLY_CONSTRUCTIBLE_ON_ARRAY_OF_NONTRIVIAL 1 -#endif - TEST(TypeTraitsTest, TestIsFunction) { struct Callable { void operator()() {} @@ -391,562 +368,6 @@ TEST(TypeTraitsTest, TestIsFunction) { EXPECT_FALSE(absl::is_function<Callable>::value); } -TEST(TypeTraitsTest, TestTrivialDestructor) { - // Verify that arithmetic types and pointers have trivial destructors. - EXPECT_TRUE(absl::is_trivially_destructible<bool>::value); - EXPECT_TRUE(absl::is_trivially_destructible<char>::value); - EXPECT_TRUE(absl::is_trivially_destructible<unsigned char>::value); - EXPECT_TRUE(absl::is_trivially_destructible<signed char>::value); - EXPECT_TRUE(absl::is_trivially_destructible<wchar_t>::value); - EXPECT_TRUE(absl::is_trivially_destructible<int>::value); - EXPECT_TRUE(absl::is_trivially_destructible<unsigned int>::value); - EXPECT_TRUE(absl::is_trivially_destructible<int16_t>::value); - EXPECT_TRUE(absl::is_trivially_destructible<uint16_t>::value); - EXPECT_TRUE(absl::is_trivially_destructible<int64_t>::value); - EXPECT_TRUE(absl::is_trivially_destructible<uint64_t>::value); - EXPECT_TRUE(absl::is_trivially_destructible<float>::value); - EXPECT_TRUE(absl::is_trivially_destructible<double>::value); - EXPECT_TRUE(absl::is_trivially_destructible<long double>::value); - EXPECT_TRUE(absl::is_trivially_destructible<std::string*>::value); - EXPECT_TRUE(absl::is_trivially_destructible<Trivial*>::value); - EXPECT_TRUE(absl::is_trivially_destructible<const std::string*>::value); - EXPECT_TRUE(absl::is_trivially_destructible<const Trivial*>::value); - EXPECT_TRUE(absl::is_trivially_destructible<std::string**>::value); - EXPECT_TRUE(absl::is_trivially_destructible<Trivial**>::value); - - // classes with destructors - EXPECT_TRUE(absl::is_trivially_destructible<Trivial>::value); - EXPECT_TRUE(absl::is_trivially_destructible<TrivialDestructor>::value); - - // Verify that types with a nontrivial or deleted destructor - // are marked as such. - EXPECT_FALSE(absl::is_trivially_destructible<NontrivialDestructor>::value); -#ifdef ABSL_TRIVIALLY_DESTRUCTIBLE_CONSIDER_DELETED_DESTRUCTOR_NOT_TRIVIAL - EXPECT_FALSE(absl::is_trivially_destructible<DeletedDestructor>::value); -#endif - - // simple_pair of such types is trivial - EXPECT_TRUE((absl::is_trivially_destructible<simple_pair<int, int>>::value)); - EXPECT_TRUE((absl::is_trivially_destructible< - simple_pair<Trivial, TrivialDestructor>>::value)); - - // Verify that types without trivial destructors are correctly marked as such. - EXPECT_FALSE(absl::is_trivially_destructible<std::string>::value); - EXPECT_FALSE(absl::is_trivially_destructible<std::vector<int>>::value); - - // Verify that simple_pairs of types without trivial destructors - // are not marked as trivial. - EXPECT_FALSE((absl::is_trivially_destructible< - simple_pair<int, std::string>>::value)); - EXPECT_FALSE((absl::is_trivially_destructible< - simple_pair<std::string, int>>::value)); - - // array of such types is trivial - using int10 = int[10]; - EXPECT_TRUE(absl::is_trivially_destructible<int10>::value); - using Trivial10 = Trivial[10]; - EXPECT_TRUE(absl::is_trivially_destructible<Trivial10>::value); - using TrivialDestructor10 = TrivialDestructor[10]; - EXPECT_TRUE(absl::is_trivially_destructible<TrivialDestructor10>::value); - - // Conversely, the opposite also holds. - using NontrivialDestructor10 = NontrivialDestructor[10]; - EXPECT_FALSE(absl::is_trivially_destructible<NontrivialDestructor10>::value); -} - -TEST(TypeTraitsTest, TestTrivialDefaultCtor) { - // arithmetic types and pointers have trivial default constructors. - EXPECT_TRUE(absl::is_trivially_default_constructible<bool>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<char>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<unsigned char>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<signed char>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<wchar_t>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<int>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<unsigned int>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<int16_t>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<uint16_t>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<int64_t>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<uint64_t>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<float>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<double>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<long double>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<std::string*>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<Trivial*>::value); - EXPECT_TRUE( - absl::is_trivially_default_constructible<const std::string*>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<const Trivial*>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<std::string**>::value); - EXPECT_TRUE(absl::is_trivially_default_constructible<Trivial**>::value); - - // types with compiler generated default ctors - EXPECT_TRUE(absl::is_trivially_default_constructible<Trivial>::value); - EXPECT_TRUE( - absl::is_trivially_default_constructible<TrivialDefaultCtor>::value); - - // Verify that types without them are not. - EXPECT_FALSE( - absl::is_trivially_default_constructible<NontrivialDefaultCtor>::value); - EXPECT_FALSE( - absl::is_trivially_default_constructible<DeletedDefaultCtor>::value); - - // types with nontrivial destructor are nontrivial - EXPECT_FALSE( - absl::is_trivially_default_constructible<NontrivialDestructor>::value); - - // types with vtables - EXPECT_FALSE(absl::is_trivially_default_constructible<Base>::value); - - // Verify that simple_pair has trivial constructors where applicable. - EXPECT_TRUE((absl::is_trivially_default_constructible< - simple_pair<int, char*>>::value)); - EXPECT_TRUE((absl::is_trivially_default_constructible< - simple_pair<int, Trivial>>::value)); - EXPECT_TRUE((absl::is_trivially_default_constructible< - simple_pair<int, TrivialDefaultCtor>>::value)); - - // Verify that types without trivial constructors are - // correctly marked as such. - EXPECT_FALSE(absl::is_trivially_default_constructible<std::string>::value); - EXPECT_FALSE( - absl::is_trivially_default_constructible<std::vector<int>>::value); - - // Verify that simple_pairs of types without trivial constructors - // are not marked as trivial. - EXPECT_FALSE((absl::is_trivially_default_constructible< - simple_pair<int, std::string>>::value)); - EXPECT_FALSE((absl::is_trivially_default_constructible< - simple_pair<std::string, int>>::value)); - - // Verify that arrays of such types are trivially default constructible - using int10 = int[10]; - EXPECT_TRUE(absl::is_trivially_default_constructible<int10>::value); - using Trivial10 = Trivial[10]; - EXPECT_TRUE(absl::is_trivially_default_constructible<Trivial10>::value); - using TrivialDefaultCtor10 = TrivialDefaultCtor[10]; - EXPECT_TRUE( - absl::is_trivially_default_constructible<TrivialDefaultCtor10>::value); - - // Conversely, the opposite also holds. -#ifdef ABSL_GCC_BUG_TRIVIALLY_CONSTRUCTIBLE_ON_ARRAY_OF_NONTRIVIAL - using NontrivialDefaultCtor10 = NontrivialDefaultCtor[10]; - EXPECT_FALSE( - absl::is_trivially_default_constructible<NontrivialDefaultCtor10>::value); -#endif -} - -// GCC prior to 7.4 had a bug in its trivially-constructible traits -// (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80654). -// This test makes sure that we do not depend on the trait in these cases when -// implementing absl triviality traits. - -template <class T> -struct BadConstructors { - BadConstructors() { static_assert(T::value, ""); } - - BadConstructors(BadConstructors&&) { static_assert(T::value, ""); } - - BadConstructors(const BadConstructors&) { static_assert(T::value, ""); } -}; - -TEST(TypeTraitsTest, TestTrivialityBadConstructors) { - using BadType = BadConstructors<int>; - - EXPECT_FALSE(absl::is_trivially_default_constructible<BadType>::value); - EXPECT_FALSE(absl::is_trivially_move_constructible<BadType>::value); - EXPECT_FALSE(absl::is_trivially_copy_constructible<BadType>::value); -} - -TEST(TypeTraitsTest, TestTrivialMoveCtor) { - // Verify that arithmetic types and pointers have trivial move - // constructors. - EXPECT_TRUE(absl::is_trivially_move_constructible<bool>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<char>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<unsigned char>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<signed char>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<wchar_t>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<int>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<unsigned int>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<int16_t>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<uint16_t>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<int64_t>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<uint64_t>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<float>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<double>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<long double>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<std::string*>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<Trivial*>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<const std::string*>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<const Trivial*>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<std::string**>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<Trivial**>::value); - - // Reference types - EXPECT_TRUE(absl::is_trivially_move_constructible<int&>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<int&&>::value); - - // types with compiler generated move ctors - EXPECT_TRUE(absl::is_trivially_move_constructible<Trivial>::value); - EXPECT_TRUE(absl::is_trivially_move_constructible<TrivialMoveCtor>::value); - - // Verify that types without them (i.e. nontrivial or deleted) are not. - EXPECT_FALSE( - absl::is_trivially_move_constructible<NontrivialCopyCtor>::value); - EXPECT_FALSE(absl::is_trivially_move_constructible<DeletedCopyCtor>::value); - EXPECT_FALSE( - absl::is_trivially_move_constructible<NonCopyableOrMovable>::value); - - // type with nontrivial destructor are nontrivial move construbtible - EXPECT_FALSE( - absl::is_trivially_move_constructible<NontrivialDestructor>::value); - - // types with vtables - EXPECT_FALSE(absl::is_trivially_move_constructible<Base>::value); - - // Verify that simple_pair of such types is trivially move constructible - EXPECT_TRUE( - (absl::is_trivially_move_constructible<simple_pair<int, char*>>::value)); - EXPECT_TRUE(( - absl::is_trivially_move_constructible<simple_pair<int, Trivial>>::value)); - EXPECT_TRUE((absl::is_trivially_move_constructible< - simple_pair<int, TrivialMoveCtor>>::value)); - - // Verify that types without trivial move constructors are - // correctly marked as such. - EXPECT_FALSE(absl::is_trivially_move_constructible<std::string>::value); - EXPECT_FALSE(absl::is_trivially_move_constructible<std::vector<int>>::value); - - // Verify that simple_pairs of types without trivial move constructors - // are not marked as trivial. - EXPECT_FALSE((absl::is_trivially_move_constructible< - simple_pair<int, std::string>>::value)); - EXPECT_FALSE((absl::is_trivially_move_constructible< - simple_pair<std::string, int>>::value)); - - // Verify that arrays are not - using int10 = int[10]; - EXPECT_FALSE(absl::is_trivially_move_constructible<int10>::value); -} - -TEST(TypeTraitsTest, TestTrivialCopyCtor) { - // Verify that arithmetic types and pointers have trivial copy - // constructors. - EXPECT_TRUE(absl::is_trivially_copy_constructible<bool>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<char>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<unsigned char>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<signed char>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<wchar_t>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<int>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<unsigned int>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<int16_t>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<uint16_t>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<int64_t>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<uint64_t>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<float>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<double>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<long double>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<std::string*>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<Trivial*>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<const std::string*>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<const Trivial*>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<std::string**>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<Trivial**>::value); - - // Reference types - EXPECT_TRUE(absl::is_trivially_copy_constructible<int&>::value); - EXPECT_FALSE(absl::is_trivially_copy_constructible<int&&>::value); - - // types with compiler generated copy ctors - EXPECT_TRUE(absl::is_trivially_copy_constructible<Trivial>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<TrivialCopyCtor>::value); - - // Verify that types without them (i.e. nontrivial or deleted) are not. - EXPECT_FALSE( - absl::is_trivially_copy_constructible<NontrivialCopyCtor>::value); - EXPECT_FALSE(absl::is_trivially_copy_constructible<DeletedCopyCtor>::value); - EXPECT_FALSE( - absl::is_trivially_copy_constructible<MovableNonCopyable>::value); - EXPECT_FALSE( - absl::is_trivially_copy_constructible<NonCopyableOrMovable>::value); - - // type with nontrivial destructor are nontrivial copy construbtible - EXPECT_FALSE( - absl::is_trivially_copy_constructible<NontrivialDestructor>::value); - - // types with vtables - EXPECT_FALSE(absl::is_trivially_copy_constructible<Base>::value); - - // Verify that simple_pair of such types is trivially copy constructible - EXPECT_TRUE( - (absl::is_trivially_copy_constructible<simple_pair<int, char*>>::value)); - EXPECT_TRUE(( - absl::is_trivially_copy_constructible<simple_pair<int, Trivial>>::value)); - EXPECT_TRUE((absl::is_trivially_copy_constructible< - simple_pair<int, TrivialCopyCtor>>::value)); - - // Verify that types without trivial copy constructors are - // correctly marked as such. - EXPECT_FALSE(absl::is_trivially_copy_constructible<std::string>::value); - EXPECT_FALSE(absl::is_trivially_copy_constructible<std::vector<int>>::value); - - // Verify that simple_pairs of types without trivial copy constructors - // are not marked as trivial. - EXPECT_FALSE((absl::is_trivially_copy_constructible< - simple_pair<int, std::string>>::value)); - EXPECT_FALSE((absl::is_trivially_copy_constructible< - simple_pair<std::string, int>>::value)); - - // Verify that arrays are not - using int10 = int[10]; - EXPECT_FALSE(absl::is_trivially_copy_constructible<int10>::value); -} - -TEST(TypeTraitsTest, TestTrivialMoveAssign) { - // Verify that arithmetic types and pointers have trivial move - // assignment operators. - EXPECT_TRUE(absl::is_trivially_move_assignable<bool>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<char>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<unsigned char>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<signed char>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<wchar_t>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<int>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<unsigned int>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<int16_t>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<uint16_t>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<int64_t>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<uint64_t>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<float>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<double>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<long double>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<std::string*>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial*>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<const std::string*>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<const Trivial*>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<std::string**>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial**>::value); - - // const qualified types are not assignable - EXPECT_FALSE(absl::is_trivially_move_assignable<const int>::value); - - // types with compiler generated move assignment - EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<TrivialMoveAssign>::value); - - // Verify that types without them (i.e. nontrivial or deleted) are not. - EXPECT_FALSE(absl::is_trivially_move_assignable<NontrivialCopyAssign>::value); - EXPECT_FALSE(absl::is_trivially_move_assignable<DeletedCopyAssign>::value); - EXPECT_FALSE(absl::is_trivially_move_assignable<NonCopyableOrMovable>::value); - - // types with vtables - EXPECT_FALSE(absl::is_trivially_move_assignable<Base>::value); - - // Verify that simple_pair is trivially assignable - EXPECT_TRUE( - (absl::is_trivially_move_assignable<simple_pair<int, char*>>::value)); - EXPECT_TRUE( - (absl::is_trivially_move_assignable<simple_pair<int, Trivial>>::value)); - EXPECT_TRUE((absl::is_trivially_move_assignable< - simple_pair<int, TrivialMoveAssign>>::value)); - - // Verify that types not trivially move assignable are - // correctly marked as such. - EXPECT_FALSE(absl::is_trivially_move_assignable<std::string>::value); - EXPECT_FALSE(absl::is_trivially_move_assignable<std::vector<int>>::value); - - // Verify that simple_pairs of types not trivially move assignable - // are not marked as trivial. - EXPECT_FALSE((absl::is_trivially_move_assignable< - simple_pair<int, std::string>>::value)); - EXPECT_FALSE((absl::is_trivially_move_assignable< - simple_pair<std::string, int>>::value)); - - // Verify that arrays are not trivially move assignable - using int10 = int[10]; - EXPECT_FALSE(absl::is_trivially_move_assignable<int10>::value); - - // Verify that references are handled correctly - EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial&&>::value); - EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial&>::value); -} - -TEST(TypeTraitsTest, TestTrivialCopyAssign) { - // Verify that arithmetic types and pointers have trivial copy - // assignment operators. - EXPECT_TRUE(absl::is_trivially_copy_assignable<bool>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<char>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<unsigned char>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<signed char>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<wchar_t>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<int>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<unsigned int>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<int16_t>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<uint16_t>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<int64_t>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<uint64_t>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<float>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<double>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<long double>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<std::string*>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial*>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<const std::string*>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<const Trivial*>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<std::string**>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial**>::value); - - // const qualified types are not assignable - EXPECT_FALSE(absl::is_trivially_copy_assignable<const int>::value); - - // types with compiler generated copy assignment - EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<TrivialCopyAssign>::value); - - // Verify that types without them (i.e. nontrivial or deleted) are not. - EXPECT_FALSE(absl::is_trivially_copy_assignable<NontrivialCopyAssign>::value); - EXPECT_FALSE(absl::is_trivially_copy_assignable<DeletedCopyAssign>::value); - EXPECT_FALSE(absl::is_trivially_copy_assignable<MovableNonCopyable>::value); - EXPECT_FALSE(absl::is_trivially_copy_assignable<NonCopyableOrMovable>::value); - - // types with vtables - EXPECT_FALSE(absl::is_trivially_copy_assignable<Base>::value); - - // Verify that simple_pair is trivially assignable - EXPECT_TRUE( - (absl::is_trivially_copy_assignable<simple_pair<int, char*>>::value)); - EXPECT_TRUE( - (absl::is_trivially_copy_assignable<simple_pair<int, Trivial>>::value)); - EXPECT_TRUE((absl::is_trivially_copy_assignable< - simple_pair<int, TrivialCopyAssign>>::value)); - - // Verify that types not trivially copy assignable are - // correctly marked as such. - EXPECT_FALSE(absl::is_trivially_copy_assignable<std::string>::value); - EXPECT_FALSE(absl::is_trivially_copy_assignable<std::vector<int>>::value); - - // Verify that simple_pairs of types not trivially copy assignable - // are not marked as trivial. - EXPECT_FALSE((absl::is_trivially_copy_assignable< - simple_pair<int, std::string>>::value)); - EXPECT_FALSE((absl::is_trivially_copy_assignable< - simple_pair<std::string, int>>::value)); - - // Verify that arrays are not trivially copy assignable - using int10 = int[10]; - EXPECT_FALSE(absl::is_trivially_copy_assignable<int10>::value); - - // Verify that references are handled correctly - EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial&&>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial&>::value); -} - -TEST(TypeTraitsTest, TestTriviallyCopyable) { - // Verify that arithmetic types and pointers are trivially copyable. - EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<bool>::value); - EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<char>::value); - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<unsigned char>::value); - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<signed char>::value); - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<wchar_t>::value); - EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<int>::value); - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<unsigned int>::value); - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<int16_t>::value); - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<uint16_t>::value); - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<int64_t>::value); - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<uint64_t>::value); - EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<float>::value); - EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<double>::value); - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<long double>::value); - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<std::string*>::value); - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<Trivial*>::value); - EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable< - const std::string*>::value); - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<const Trivial*>::value); - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<std::string**>::value); - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<Trivial**>::value); - - // const qualified types are not assignable but are constructible - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<const int>::value); - - // Trivial copy constructor/assignment and destructor. - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<Trivial>::value); - // Trivial copy assignment, but non-trivial copy constructor/destructor. - EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable< - TrivialCopyAssign>::value); - // Trivial copy constructor, but non-trivial assignment. - EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable< - TrivialCopyCtor>::value); - - // Types with a non-trivial copy constructor/assignment - EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable< - NontrivialCopyCtor>::value); - EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable< - NontrivialCopyAssign>::value); - - // Types without copy constructor/assignment, but with move - // MSVC disagrees with other compilers about this: - // EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable< - // MovableNonCopyable>::value); - - // Types without copy/move constructor/assignment - EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable< - NonCopyableOrMovable>::value); - - // No copy assign, but has trivial copy constructor. - EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable< - DeletedCopyAssign>::value); - - // types with vtables - EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<Base>::value); - - // Verify that simple_pair is trivially copyable if members are - EXPECT_TRUE((absl::type_traits_internal::is_trivially_copyable< - simple_pair<int, char*>>::value)); - EXPECT_TRUE((absl::type_traits_internal::is_trivially_copyable< - simple_pair<int, Trivial>>::value)); - - // Verify that types not trivially copyable are - // correctly marked as such. - EXPECT_FALSE( - absl::type_traits_internal::is_trivially_copyable<std::string>::value); - EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable< - std::vector<int>>::value); - - // Verify that simple_pairs of types not trivially copyable - // are not marked as trivial. - EXPECT_FALSE((absl::type_traits_internal::is_trivially_copyable< - simple_pair<int, std::string>>::value)); - EXPECT_FALSE((absl::type_traits_internal::is_trivially_copyable< - simple_pair<std::string, int>>::value)); - EXPECT_FALSE((absl::type_traits_internal::is_trivially_copyable< - simple_pair<int, TrivialCopyAssign>>::value)); - - // Verify that arrays of trivially copyable types are trivially copyable - using int10 = int[10]; - EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<int10>::value); - using int10x10 = int[10][10]; - EXPECT_TRUE( - absl::type_traits_internal::is_trivially_copyable<int10x10>::value); - - // Verify that references are handled correctly - EXPECT_FALSE( - absl::type_traits_internal::is_trivially_copyable<Trivial&&>::value); - EXPECT_FALSE( - absl::type_traits_internal::is_trivially_copyable<Trivial&>::value); -} - TEST(TypeTraitsTest, TestRemoveCVRef) { EXPECT_TRUE( (std::is_same<typename absl::remove_cvref<int>::type, int>::value)); @@ -1241,82 +662,6 @@ TEST(TypeTraitsTest, TestResultOf) { EXPECT_EQ(TypeEnum::D, GetTypeExt(Wrap<TypeD>())); } -template <typename T> -bool TestCopyAssign() { - return absl::is_copy_assignable<T>::value == - std::is_copy_assignable<T>::value; -} - -TEST(TypeTraitsTest, IsCopyAssignable) { - EXPECT_TRUE(TestCopyAssign<int>()); - EXPECT_TRUE(TestCopyAssign<int&>()); - EXPECT_TRUE(TestCopyAssign<int&&>()); - - struct S {}; - EXPECT_TRUE(TestCopyAssign<S>()); - EXPECT_TRUE(TestCopyAssign<S&>()); - EXPECT_TRUE(TestCopyAssign<S&&>()); - - class C { - public: - explicit C(C* c) : c_(c) {} - ~C() { delete c_; } - - private: - C* c_; - }; - EXPECT_TRUE(TestCopyAssign<C>()); - EXPECT_TRUE(TestCopyAssign<C&>()); - EXPECT_TRUE(TestCopyAssign<C&&>()); - - // Reason for ifndef: add_lvalue_reference<T> in libc++ breaks for these cases -#ifndef _LIBCPP_VERSION - EXPECT_TRUE(TestCopyAssign<int()>()); - EXPECT_TRUE(TestCopyAssign<int(int) const>()); - EXPECT_TRUE(TestCopyAssign<int(...) volatile&>()); - EXPECT_TRUE(TestCopyAssign<int(int, ...) const volatile&&>()); -#endif // _LIBCPP_VERSION -} - -template <typename T> -bool TestMoveAssign() { - return absl::is_move_assignable<T>::value == - std::is_move_assignable<T>::value; -} - -TEST(TypeTraitsTest, IsMoveAssignable) { - EXPECT_TRUE(TestMoveAssign<int>()); - EXPECT_TRUE(TestMoveAssign<int&>()); - EXPECT_TRUE(TestMoveAssign<int&&>()); - - struct S {}; - EXPECT_TRUE(TestMoveAssign<S>()); - EXPECT_TRUE(TestMoveAssign<S&>()); - EXPECT_TRUE(TestMoveAssign<S&&>()); - - class C { - public: - explicit C(C* c) : c_(c) {} - ~C() { delete c_; } - void operator=(const C&) = delete; - void operator=(C&&) = delete; - - private: - C* c_; - }; - EXPECT_TRUE(TestMoveAssign<C>()); - EXPECT_TRUE(TestMoveAssign<C&>()); - EXPECT_TRUE(TestMoveAssign<C&&>()); - - // Reason for ifndef: add_lvalue_reference<T> in libc++ breaks for these cases -#ifndef _LIBCPP_VERSION - EXPECT_TRUE(TestMoveAssign<int()>()); - EXPECT_TRUE(TestMoveAssign<int(int) const>()); - EXPECT_TRUE(TestMoveAssign<int(...) volatile&>()); - EXPECT_TRUE(TestMoveAssign<int(int, ...) const volatile&&>()); -#endif // _LIBCPP_VERSION -} - namespace adl_namespace { struct DeletedSwap { |