| // 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 |
| // |
| // http://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 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 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 NonCopyable { |
| NonCopyable() = default; |
| NonCopyable(const NonCopyable&) = delete; |
| NonCopyable& operator=(const NonCopyable&) = delete; |
| }; |
| |
| class Base { |
| public: |
| virtual ~Base() {} |
| }; |
| |
| // In GCC/Clang, std::is_trivially_constructible requires that the destructor is |
| // trivial. However, MSVC doesn't require that. This results in different |
| // behavior when checking is_trivially_constructible on any type with |
| // nontrivial destructor. Since absl::is_trivially_default_constructible and |
| // absl::is_trivially_copy_constructible both follows Clang/GCC's interpretation |
| // and check is_trivially_destructible, it results in inconsistency with |
| // std::is_trivially_xxx_constructible on MSVC. This macro is used to work |
| // around this issue in test. In practice, a trivially constructible type |
| // should also be trivially destructible. |
| // 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 |
| #ifndef _MSC_VER |
| #define ABSL_TRIVIALLY_CONSTRUCTIBLE_VERIFY_TRIVIALLY_DESTRUCTIBLE 1 |
| #endif |
| |
| // 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, 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); |
| |
| #ifdef ABSL_TRIVIALLY_CONSTRUCTIBLE_VERIFY_TRIVIALLY_DESTRUCTIBLE |
| // types with nontrivial destructor are nontrivial |
| EXPECT_FALSE( |
| absl::is_trivially_default_constructible<NontrivialDestructor>::value); |
| #endif |
| |
| // 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 |
| } |
| |
| 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); |
| |
| // 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<NonCopyable>::value); |
| |
| #ifdef ABSL_TRIVIALLY_CONSTRUCTIBLE_VERIFY_TRIVIALLY_DESTRUCTIBLE |
| // type with nontrivial destructor are nontrivial copy construbtible |
| EXPECT_FALSE( |
| absl::is_trivially_copy_constructible<NontrivialDestructor>::value); |
| #endif |
| |
| // 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, 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<NonCopyable>::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); |
| } |
| |
| #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>())); |
| } |
| |
| } // namespace |
