diff options
Diffstat (limited to 'absl/meta/type_traits_test.cc')
| -rw-r--r-- | absl/meta/type_traits_test.cc | 337 |
1 files changed, 245 insertions, 92 deletions
diff --git a/absl/meta/type_traits_test.cc b/absl/meta/type_traits_test.cc index 67d1c4555c..c44d1c5ff8 100644 --- a/absl/meta/type_traits_test.cc +++ b/absl/meta/type_traits_test.cc @@ -99,6 +99,18 @@ class Trivial { int n_; }; +struct TrivialDestructor { + ~TrivialDestructor() = default; +}; + +struct NontrivialDestructor { + ~NontrivialDestructor() {} +}; + +struct DeletedDestructor { + ~DeletedDestructor() = delete; +}; + class TrivialDefaultCtor { public: TrivialDefaultCtor() = default; @@ -108,6 +120,23 @@ class TrivialDefaultCtor { 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) {} @@ -121,22 +150,57 @@ class TrivialCopyCtor { 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 non trivial destructor + ~TrivialCopyAssign() {} // can have nontrivial destructor private: int n_; }; -struct NonTrivialDestructor { - ~NonTrivialDestructor() {} +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_; }; -struct TrivialDestructor { - ~TrivialDestructor() = default; +class DeletedCopyAssign { + public: + explicit DeletedCopyAssign(int n) : n_(n) {} + DeletedCopyAssign(const DeletedCopyAssign&) = default; + DeletedCopyAssign& operator=(const DeletedCopyAssign&) = delete; + + private: + int n_; }; struct NonCopyable { @@ -152,19 +216,105 @@ class 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 +// 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. -#ifdef _MSC_VER -#define ABSL_TRIVIALLY_CONSTRUCTIBLE_VERIFY_TRIVIALLY_DESTRUCTIBLE +// 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); @@ -184,42 +334,67 @@ TEST(TypeTraitsTest, TestTrivialDefaultCtor) { 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 TrivialCopyCtor*>::value); - EXPECT_TRUE( - absl::is_trivially_default_constructible<TrivialCopyCtor**>::value); + 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); -#ifndef ABSL_TRIVIALLY_CONSTRUCTIBLE_VERIFY_TRIVIALLY_DESTRUCTIBLE - // types with non trivial destructor are non trivial + // Verify that types without them are not. EXPECT_FALSE( - absl::is_trivially_default_constructible<NonTrivialDestructor>::value); + 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 arrays of such types are trivially default constructible - typedef int int10[10]; - EXPECT_TRUE(absl::is_trivially_default_constructible<int10>::value); - typedef Trivial Trivial10[10]; - EXPECT_TRUE(absl::is_trivially_default_constructible<Trivial10>::value); - typedef Trivial TrivialDefaultCtor10[10]; - EXPECT_TRUE( - absl::is_trivially_default_constructible<TrivialDefaultCtor10>::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) { @@ -241,18 +416,26 @@ TEST(TypeTraitsTest, TestTrivialCopyCtor) { 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 TrivialCopyCtor*>::value); - EXPECT_TRUE(absl::is_trivially_copy_constructible<TrivialCopyCtor**>::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); -#ifndef ABSL_TRIVIALLY_CONSTRUCTIBLE_VERIFY_TRIVIALLY_DESTRUCTIBLE - // type with non-trivial destructor are non-trivial copy construbtible + // 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); + absl::is_trivially_copy_constructible<NontrivialDestructor>::value); #endif // types with vtables @@ -266,9 +449,10 @@ TEST(TypeTraitsTest, TestTrivialCopyCtor) { EXPECT_TRUE((absl::is_trivially_copy_constructible< simple_pair<int, TrivialCopyCtor>>::value)); - // Verify that arrays are not - typedef int int10[10]; - EXPECT_FALSE(absl::is_trivially_copy_constructible<int10>::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. @@ -277,18 +461,14 @@ TEST(TypeTraitsTest, TestTrivialCopyCtor) { EXPECT_FALSE((absl::is_trivially_copy_constructible< simple_pair<std::string, int>>::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); - - // types with deleted copy constructors are not copy constructible - EXPECT_FALSE(absl::is_trivially_copy_constructible<NonCopyable>::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 - // constructors. + // 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); @@ -305,9 +485,10 @@ TEST(TypeTraitsTest, TestTrivialCopyAssign) { 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 TrivialCopyCtor*>::value); - EXPECT_TRUE(absl::is_trivially_copy_assignable<TrivialCopyCtor**>::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); @@ -316,65 +497,37 @@ TEST(TypeTraitsTest, TestTrivialCopyAssign) { 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 arrays are not trivially copy assignable - typedef int int10[10]; - EXPECT_FALSE(absl::is_trivially_copy_assignable<int10>::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 without trivial copy constructors are + // 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); - // types with deleted copy assignment are not copy assignable - EXPECT_FALSE(absl::is_trivially_copy_assignable<NonCopyable>::value); -} - -TEST(TypeTraitsTest, TestTrivialDestructor) { - // Verify that arithmetic types and pointers have trivial copy - // constructors. - 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 TrivialCopyCtor*>::value); - EXPECT_TRUE(absl::is_trivially_destructible<TrivialCopyCtor**>::value); - - // classes with destructors - EXPECT_TRUE(absl::is_trivially_destructible<Trivial>::value); - EXPECT_TRUE(absl::is_trivially_destructible<TrivialDestructor>::value); - EXPECT_FALSE(absl::is_trivially_destructible<NonTrivialDestructor>::value); - - // 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 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)); - // array of such types is trivial - typedef int int10[10]; - EXPECT_TRUE(absl::is_trivially_destructible<int10>::value); - typedef TrivialDestructor TrivialDestructor10[10]; - EXPECT_TRUE(absl::is_trivially_destructible<TrivialDestructor10>::value); - typedef NonTrivialDestructor NonTrivialDestructor10[10]; - EXPECT_FALSE(absl::is_trivially_destructible<NonTrivialDestructor10>::value); + // Verify that arrays are not trivially copy assignable + using int10 = int[10]; + EXPECT_FALSE(absl::is_trivially_copy_assignable<int10>::value); } #define ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(trait_name, ...) \ |