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Diffstat (limited to 'third_party/abseil_cpp/absl/meta/type_traits_test.cc')
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diff --git a/third_party/abseil_cpp/absl/meta/type_traits_test.cc b/third_party/abseil_cpp/absl/meta/type_traits_test.cc new file mode 100644 index 0000000000..1aafd0d49a --- /dev/null +++ b/third_party/abseil_cpp/absl/meta/type_traits_test.cc @@ -0,0 +1,1368 @@ +// Copyright 2017 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/meta/type_traits.h" + +#include <cstdint> +#include <string> +#include <type_traits> +#include <utility> +#include <vector> + +#include "gtest/gtest.h" + +namespace { + +using ::testing::StaticAssertTypeEq; + +template <class T, class U> +struct simple_pair { + T first; + U second; +}; + +struct Dummy {}; + +struct ReturnType {}; +struct ConvertibleToReturnType { + operator ReturnType() const; // NOLINT +}; + +// Unique types used as parameter types for testing the detection idiom. +struct StructA {}; +struct StructB {}; +struct StructC {}; + +struct TypeWithBarFunction { + template <class T, + absl::enable_if_t<std::is_same<T&&, StructA&>::value, int> = 0> + ReturnType bar(T&&, const StructB&, StructC&&) &&; // NOLINT +}; + +struct TypeWithBarFunctionAndConvertibleReturnType { + template <class T, + absl::enable_if_t<std::is_same<T&&, StructA&>::value, int> = 0> + ConvertibleToReturnType bar(T&&, const StructB&, StructC&&) &&; // NOLINT +}; + +template <class Class, class... Ts> +using BarIsCallableImpl = + decltype(std::declval<Class>().bar(std::declval<Ts>()...)); + +template <class Class, class... T> +using BarIsCallable = + absl::type_traits_internal::is_detected<BarIsCallableImpl, Class, T...>; + +template <class Class, class... T> +using BarIsCallableConv = absl::type_traits_internal::is_detected_convertible< + ReturnType, BarIsCallableImpl, Class, T...>; + +// NOTE: Test of detail type_traits_internal::is_detected. +TEST(IsDetectedTest, BasicUsage) { + EXPECT_TRUE((BarIsCallable<TypeWithBarFunction, StructA&, const StructB&, + StructC>::value)); + EXPECT_TRUE( + (BarIsCallable<TypeWithBarFunction, StructA&, StructB&, StructC>::value)); + EXPECT_TRUE( + (BarIsCallable<TypeWithBarFunction, StructA&, StructB, StructC>::value)); + + EXPECT_FALSE((BarIsCallable<int, StructA&, const StructB&, StructC>::value)); + EXPECT_FALSE((BarIsCallable<TypeWithBarFunction&, StructA&, const StructB&, + StructC>::value)); + EXPECT_FALSE((BarIsCallable<TypeWithBarFunction, StructA, const StructB&, + StructC>::value)); +} + +// NOTE: Test of detail type_traits_internal::is_detected_convertible. +TEST(IsDetectedConvertibleTest, BasicUsage) { + EXPECT_TRUE((BarIsCallableConv<TypeWithBarFunction, StructA&, const StructB&, + StructC>::value)); + EXPECT_TRUE((BarIsCallableConv<TypeWithBarFunction, StructA&, StructB&, + StructC>::value)); + EXPECT_TRUE((BarIsCallableConv<TypeWithBarFunction, StructA&, StructB, + StructC>::value)); + EXPECT_TRUE((BarIsCallableConv<TypeWithBarFunctionAndConvertibleReturnType, + StructA&, const StructB&, StructC>::value)); + EXPECT_TRUE((BarIsCallableConv<TypeWithBarFunctionAndConvertibleReturnType, + StructA&, StructB&, StructC>::value)); + EXPECT_TRUE((BarIsCallableConv<TypeWithBarFunctionAndConvertibleReturnType, + StructA&, StructB, StructC>::value)); + + EXPECT_FALSE( + (BarIsCallableConv<int, StructA&, const StructB&, StructC>::value)); + EXPECT_FALSE((BarIsCallableConv<TypeWithBarFunction&, StructA&, + const StructB&, StructC>::value)); + EXPECT_FALSE((BarIsCallableConv<TypeWithBarFunction, StructA, const StructB&, + StructC>::value)); + EXPECT_FALSE((BarIsCallableConv<TypeWithBarFunctionAndConvertibleReturnType&, + StructA&, const StructB&, StructC>::value)); + EXPECT_FALSE((BarIsCallableConv<TypeWithBarFunctionAndConvertibleReturnType, + StructA, const StructB&, StructC>::value)); +} + +TEST(VoidTTest, BasicUsage) { + StaticAssertTypeEq<void, absl::void_t<Dummy>>(); + StaticAssertTypeEq<void, absl::void_t<Dummy, Dummy, Dummy>>(); +} + +TEST(ConjunctionTest, BasicBooleanLogic) { + EXPECT_TRUE(absl::conjunction<>::value); + EXPECT_TRUE(absl::conjunction<std::true_type>::value); + EXPECT_TRUE((absl::conjunction<std::true_type, std::true_type>::value)); + EXPECT_FALSE((absl::conjunction<std::true_type, std::false_type>::value)); + EXPECT_FALSE((absl::conjunction<std::false_type, std::true_type>::value)); + EXPECT_FALSE((absl::conjunction<std::false_type, std::false_type>::value)); +} + +struct MyTrueType { + static constexpr bool value = true; +}; + +struct MyFalseType { + static constexpr bool value = false; +}; + +TEST(ConjunctionTest, ShortCircuiting) { + EXPECT_FALSE( + (absl::conjunction<std::true_type, std::false_type, Dummy>::value)); + EXPECT_TRUE((std::is_base_of<MyFalseType, + absl::conjunction<std::true_type, MyFalseType, + std::false_type>>::value)); + EXPECT_TRUE( + (std::is_base_of<MyTrueType, + absl::conjunction<std::true_type, MyTrueType>>::value)); +} + +TEST(DisjunctionTest, BasicBooleanLogic) { + EXPECT_FALSE(absl::disjunction<>::value); + EXPECT_FALSE(absl::disjunction<std::false_type>::value); + EXPECT_TRUE((absl::disjunction<std::true_type, std::true_type>::value)); + EXPECT_TRUE((absl::disjunction<std::true_type, std::false_type>::value)); + EXPECT_TRUE((absl::disjunction<std::false_type, std::true_type>::value)); + EXPECT_FALSE((absl::disjunction<std::false_type, std::false_type>::value)); +} + +TEST(DisjunctionTest, ShortCircuiting) { + EXPECT_TRUE( + (absl::disjunction<std::false_type, std::true_type, Dummy>::value)); + EXPECT_TRUE(( + std::is_base_of<MyTrueType, absl::disjunction<std::false_type, MyTrueType, + std::true_type>>::value)); + EXPECT_TRUE(( + std::is_base_of<MyFalseType, + absl::disjunction<std::false_type, MyFalseType>>::value)); +} + +TEST(NegationTest, BasicBooleanLogic) { + EXPECT_FALSE(absl::negation<std::true_type>::value); + EXPECT_FALSE(absl::negation<MyTrueType>::value); + EXPECT_TRUE(absl::negation<std::false_type>::value); + EXPECT_TRUE(absl::negation<MyFalseType>::value); +} + +// all member functions are trivial +class Trivial { + int n_; +}; + +struct TrivialDestructor { + ~TrivialDestructor() = default; +}; + +struct NontrivialDestructor { + ~NontrivialDestructor() {} +}; + +struct DeletedDestructor { + ~DeletedDestructor() = delete; +}; + +class TrivialDefaultCtor { + public: + TrivialDefaultCtor() = default; + explicit TrivialDefaultCtor(int n) : n_(n) {} + + private: + int n_; +}; + +class NontrivialDefaultCtor { + public: + NontrivialDefaultCtor() : n_(1) {} + + private: + int n_; +}; + +class DeletedDefaultCtor { + public: + DeletedDefaultCtor() = delete; + explicit DeletedDefaultCtor(int n) : n_(n) {} + + private: + int n_; +}; + +class TrivialMoveCtor { + public: + explicit TrivialMoveCtor(int n) : n_(n) {} + TrivialMoveCtor(TrivialMoveCtor&&) = default; + TrivialMoveCtor& operator=(const TrivialMoveCtor& t) { + n_ = t.n_; + return *this; + } + + private: + int n_; +}; + +class NontrivialMoveCtor { + public: + explicit NontrivialMoveCtor(int n) : n_(n) {} + NontrivialMoveCtor(NontrivialMoveCtor&& t) noexcept : n_(t.n_) {} + NontrivialMoveCtor& operator=(const NontrivialMoveCtor&) = default; + + private: + int n_; +}; + +class TrivialCopyCtor { + public: + explicit TrivialCopyCtor(int n) : n_(n) {} + TrivialCopyCtor(const TrivialCopyCtor&) = default; + TrivialCopyCtor& operator=(const TrivialCopyCtor& t) { + n_ = t.n_; + return *this; + } + + private: + int n_; +}; + +class NontrivialCopyCtor { + public: + explicit NontrivialCopyCtor(int n) : n_(n) {} + NontrivialCopyCtor(const NontrivialCopyCtor& t) : n_(t.n_) {} + NontrivialCopyCtor& operator=(const NontrivialCopyCtor&) = default; + + private: + int n_; +}; + +class DeletedCopyCtor { + public: + explicit DeletedCopyCtor(int n) : n_(n) {} + DeletedCopyCtor(const DeletedCopyCtor&) = delete; + DeletedCopyCtor& operator=(const DeletedCopyCtor&) = default; + + private: + int n_; +}; + +class TrivialMoveAssign { + public: + explicit TrivialMoveAssign(int n) : n_(n) {} + TrivialMoveAssign(const TrivialMoveAssign& t) : n_(t.n_) {} + TrivialMoveAssign& operator=(TrivialMoveAssign&&) = default; + ~TrivialMoveAssign() {} // can have nontrivial destructor + private: + int n_; +}; + +class NontrivialMoveAssign { + public: + explicit NontrivialMoveAssign(int n) : n_(n) {} + NontrivialMoveAssign(const NontrivialMoveAssign&) = default; + NontrivialMoveAssign& operator=(NontrivialMoveAssign&& t) noexcept { + n_ = t.n_; + return *this; + } + + private: + int n_; +}; + +class TrivialCopyAssign { + public: + explicit TrivialCopyAssign(int n) : n_(n) {} + TrivialCopyAssign(const TrivialCopyAssign& t) : n_(t.n_) {} + TrivialCopyAssign& operator=(const TrivialCopyAssign& t) = default; + ~TrivialCopyAssign() {} // can have nontrivial destructor + private: + int n_; +}; + +class NontrivialCopyAssign { + public: + explicit NontrivialCopyAssign(int n) : n_(n) {} + NontrivialCopyAssign(const NontrivialCopyAssign&) = default; + NontrivialCopyAssign& operator=(const NontrivialCopyAssign& t) { + n_ = t.n_; + return *this; + } + + private: + int n_; +}; + +class DeletedCopyAssign { + public: + explicit DeletedCopyAssign(int n) : n_(n) {} + DeletedCopyAssign(const DeletedCopyAssign&) = default; + DeletedCopyAssign& operator=(const DeletedCopyAssign&) = delete; + + private: + int n_; +}; + +struct MovableNonCopyable { + MovableNonCopyable() = default; + MovableNonCopyable(const MovableNonCopyable&) = delete; + MovableNonCopyable(MovableNonCopyable&&) = default; + MovableNonCopyable& operator=(const MovableNonCopyable&) = delete; + MovableNonCopyable& operator=(MovableNonCopyable&&) = default; +}; + +struct NonCopyableOrMovable { + NonCopyableOrMovable() = default; + NonCopyableOrMovable(const NonCopyableOrMovable&) = delete; + NonCopyableOrMovable(NonCopyableOrMovable&&) = delete; + NonCopyableOrMovable& operator=(const NonCopyableOrMovable&) = delete; + NonCopyableOrMovable& operator=(NonCopyableOrMovable&&) = delete; +}; + +class Base { + public: + 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()() {} + }; + EXPECT_TRUE(absl::is_function<void()>::value); + EXPECT_TRUE(absl::is_function<void()&>::value); + EXPECT_TRUE(absl::is_function<void() const>::value); + EXPECT_TRUE(absl::is_function<void() noexcept>::value); + EXPECT_TRUE(absl::is_function<void(...) noexcept>::value); + + EXPECT_FALSE(absl::is_function<void(*)()>::value); + EXPECT_FALSE(absl::is_function<void(&)()>::value); + EXPECT_FALSE(absl::is_function<int>::value); + 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); +} + +#define ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(trait_name, ...) \ + EXPECT_TRUE((std::is_same<typename std::trait_name<__VA_ARGS__>::type, \ + absl::trait_name##_t<__VA_ARGS__>>::value)) + +TEST(TypeTraitsTest, TestRemoveCVAliases) { + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_cv, int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_cv, const int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_cv, volatile int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_cv, const volatile int); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_const, int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_const, const int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_const, volatile int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_const, const volatile int); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_volatile, int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_volatile, const int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_volatile, volatile int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_volatile, const volatile int); +} + +TEST(TypeTraitsTest, TestAddCVAliases) { + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_cv, int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_cv, const int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_cv, volatile int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_cv, const volatile int); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_const, int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_const, const int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_const, volatile int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_const, const volatile int); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_volatile, int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_volatile, const int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_volatile, volatile int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_volatile, const volatile int); +} + +TEST(TypeTraitsTest, TestReferenceAliases) { + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_reference, int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_reference, volatile int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_reference, int&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_reference, volatile int&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_reference, int&&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_reference, volatile int&&); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_lvalue_reference, int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_lvalue_reference, volatile int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_lvalue_reference, int&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_lvalue_reference, volatile int&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_lvalue_reference, int&&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_lvalue_reference, volatile int&&); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_rvalue_reference, int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_rvalue_reference, volatile int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_rvalue_reference, int&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_rvalue_reference, volatile int&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_rvalue_reference, int&&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_rvalue_reference, volatile int&&); +} + +TEST(TypeTraitsTest, TestPointerAliases) { + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_pointer, int*); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_pointer, volatile int*); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_pointer, int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(add_pointer, volatile int); +} + +TEST(TypeTraitsTest, TestSignednessAliases) { + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_signed, int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_signed, volatile int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_signed, unsigned); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_signed, volatile unsigned); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_unsigned, int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_unsigned, volatile int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_unsigned, unsigned); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(make_unsigned, volatile unsigned); +} + +TEST(TypeTraitsTest, TestExtentAliases) { + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_extent, int[]); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_extent, int[1]); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_extent, int[1][1]); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_extent, int[][1]); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_all_extents, int[]); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_all_extents, int[1]); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_all_extents, int[1][1]); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(remove_all_extents, int[][1]); +} + +TEST(TypeTraitsTest, TestAlignedStorageAlias) { + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 1); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 2); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 3); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 4); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 5); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 6); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 7); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 8); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 9); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 10); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 11); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 12); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 13); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 14); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 15); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 16); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 17); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 18); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 19); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 20); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 21); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 22); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 23); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 24); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 25); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 26); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 27); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 28); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 29); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 30); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 31); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 32); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 33); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 1, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 2, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 3, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 4, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 5, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 6, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 7, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 8, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 9, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 10, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 11, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 12, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 13, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 14, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 15, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 16, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 17, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 18, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 19, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 20, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 21, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 22, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 23, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 24, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 25, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 26, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 27, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 28, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 29, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 30, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 31, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 32, 128); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(aligned_storage, 33, 128); +} + +TEST(TypeTraitsTest, TestDecay) { + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, const int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, volatile int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, const volatile int); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, const int&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, volatile int&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, const volatile int&); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, const int&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, volatile int&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, const volatile int&); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int[1]); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int[1][1]); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int[][1]); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int()); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int(float)); // NOLINT + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(decay, int(char, ...)); // NOLINT +} + +struct TypeA {}; +struct TypeB {}; +struct TypeC {}; +struct TypeD {}; + +template <typename T> +struct Wrap {}; + +enum class TypeEnum { A, B, C, D }; + +struct GetTypeT { + template <typename T, + absl::enable_if_t<std::is_same<T, TypeA>::value, int> = 0> + TypeEnum operator()(Wrap<T>) const { + return TypeEnum::A; + } + + template <typename T, + absl::enable_if_t<std::is_same<T, TypeB>::value, int> = 0> + TypeEnum operator()(Wrap<T>) const { + return TypeEnum::B; + } + + template <typename T, + absl::enable_if_t<std::is_same<T, TypeC>::value, int> = 0> + TypeEnum operator()(Wrap<T>) const { + return TypeEnum::C; + } + + // NOTE: TypeD is intentionally not handled +} constexpr GetType = {}; + +TEST(TypeTraitsTest, TestEnableIf) { + EXPECT_EQ(TypeEnum::A, GetType(Wrap<TypeA>())); + EXPECT_EQ(TypeEnum::B, GetType(Wrap<TypeB>())); + EXPECT_EQ(TypeEnum::C, GetType(Wrap<TypeC>())); +} + +TEST(TypeTraitsTest, TestConditional) { + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(conditional, true, int, char); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(conditional, false, int, char); +} + +// TODO(calabrese) Check with specialized std::common_type +TEST(TypeTraitsTest, TestCommonType) { + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(common_type, int); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(common_type, int, char); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(common_type, int, char, int); + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(common_type, int&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(common_type, int, char&); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(common_type, int, char, int&); +} + +TEST(TypeTraitsTest, TestUnderlyingType) { + enum class enum_char : char {}; + enum class enum_long_long : long long {}; // NOLINT(runtime/int) + + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(underlying_type, enum_char); + ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(underlying_type, enum_long_long); +} + +struct GetTypeExtT { + template <typename T> + absl::result_of_t<const GetTypeT&(T)> operator()(T&& arg) const { + return GetType(std::forward<T>(arg)); + } + + TypeEnum operator()(Wrap<TypeD>) const { return TypeEnum::D; } +} constexpr GetTypeExt = {}; + +TEST(TypeTraitsTest, TestResultOf) { + EXPECT_EQ(TypeEnum::A, GetTypeExt(Wrap<TypeA>())); + EXPECT_EQ(TypeEnum::B, GetTypeExt(Wrap<TypeB>())); + EXPECT_EQ(TypeEnum::C, GetTypeExt(Wrap<TypeC>())); + 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 { +}; + +void swap(DeletedSwap&, DeletedSwap&) = delete; + +struct SpecialNoexceptSwap { + SpecialNoexceptSwap(SpecialNoexceptSwap&&) {} + SpecialNoexceptSwap& operator=(SpecialNoexceptSwap&&) { return *this; } + ~SpecialNoexceptSwap() = default; +}; + +void swap(SpecialNoexceptSwap&, SpecialNoexceptSwap&) noexcept {} + +} // namespace adl_namespace + +TEST(TypeTraitsTest, IsSwappable) { + using absl::type_traits_internal::IsSwappable; + using absl::type_traits_internal::StdSwapIsUnconstrained; + + EXPECT_TRUE(IsSwappable<int>::value); + + struct S {}; + EXPECT_TRUE(IsSwappable<S>::value); + + struct NoConstruct { + NoConstruct(NoConstruct&&) = delete; + NoConstruct& operator=(NoConstruct&&) { return *this; } + ~NoConstruct() = default; + }; + + EXPECT_EQ(IsSwappable<NoConstruct>::value, StdSwapIsUnconstrained::value); + struct NoAssign { + NoAssign(NoAssign&&) {} + NoAssign& operator=(NoAssign&&) = delete; + ~NoAssign() = default; + }; + + EXPECT_EQ(IsSwappable<NoAssign>::value, StdSwapIsUnconstrained::value); + + EXPECT_FALSE(IsSwappable<adl_namespace::DeletedSwap>::value); + + EXPECT_TRUE(IsSwappable<adl_namespace::SpecialNoexceptSwap>::value); +} + +TEST(TypeTraitsTest, IsNothrowSwappable) { + using absl::type_traits_internal::IsNothrowSwappable; + using absl::type_traits_internal::StdSwapIsUnconstrained; + + EXPECT_TRUE(IsNothrowSwappable<int>::value); + + struct NonNoexceptMoves { + NonNoexceptMoves(NonNoexceptMoves&&) {} + NonNoexceptMoves& operator=(NonNoexceptMoves&&) { return *this; } + ~NonNoexceptMoves() = default; + }; + + EXPECT_FALSE(IsNothrowSwappable<NonNoexceptMoves>::value); + + struct NoConstruct { + NoConstruct(NoConstruct&&) = delete; + NoConstruct& operator=(NoConstruct&&) { return *this; } + ~NoConstruct() = default; + }; + + EXPECT_FALSE(IsNothrowSwappable<NoConstruct>::value); + + struct NoAssign { + NoAssign(NoAssign&&) {} + NoAssign& operator=(NoAssign&&) = delete; + ~NoAssign() = default; + }; + + EXPECT_FALSE(IsNothrowSwappable<NoAssign>::value); + + EXPECT_FALSE(IsNothrowSwappable<adl_namespace::DeletedSwap>::value); + + EXPECT_TRUE(IsNothrowSwappable<adl_namespace::SpecialNoexceptSwap>::value); +} + +} // namespace |