Export of internal Abseil changes.
-- 5755b40f6025f3ca126070fc68adb8fde9a7f01b by Abseil Team <absl-team@google.com>: Fix -Wextra-semi error. PiperOrigin-RevId: 243215850 -- 3b6b6e18df9fbd233943cae460f0063f4efaa7c7 by Eric Fiselier <ericwf@google.com>: Internal Change. PiperOrigin-RevId: 243152671 -- 82eef03f246009c806c25607c5682547cb4ad21e by Abseil Team <absl-team@google.com>: Internal change. PiperOrigin-RevId: 243151861 -- c14e6340fca7070634e0ecfdf97833d930dd0e5d by Samuel Benzaquen <sbenza@google.com>: Internal change PiperOrigin-RevId: 243123590 -- 9abb7a6b22457c0aa72d72b3b9392efd226d302a by Andy Getzendanner <durandal@google.com>: Implement operator<<(std::ostream &, absl::LogSeverity) so that absl::LogSeverity values can be streamed. PiperOrigin-RevId: 243117646 GitOrigin-RevId: 5755b40f6025f3ca126070fc68adb8fde9a7f01b Change-Id: I7ea607d8a4e803ad15a3090139271f58ad4173a3
This commit is contained in:
Abseil Team
Shaindel Schwartz
parent
0b545b4601
commit
a02f62f456
12 changed files with 281 additions and 26 deletions
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@ -26,7 +26,6 @@ cc_test(
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linkopts = ABSL_DEFAULT_LINKOPTS,
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deps = [
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":type_traits",
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"//absl/base:core_headers",
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"@com_google_googletest//:gtest_main",
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],
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)
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@ -35,8 +35,6 @@ absl_cc_test(
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${ABSL_TEST_COPTS}
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DEPS
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absl::type_traits
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absl::base
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absl::core_headers
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gmock_main
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)
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@ -341,6 +341,49 @@ struct is_trivially_copy_assignable
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#endif // ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE
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};
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namespace type_traits_internal {
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// is_trivially_copyable()
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//
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// Determines whether the passed type `T` is trivially copyable.
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//
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// This metafunction is designed to be a drop-in replacement for the C++11
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// `std::is_trivially_copyable()` metafunction for platforms that have
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// incomplete C++11 support (such as libstdc++ 4.x). We use the C++17 definition
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// of TriviallyCopyable.
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//
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// NOTE: `is_trivially_copyable<T>::value` is `true` if all of T's copy/move
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// constructors/assignment operators are trivial or deleted, T has at least
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// one non-deleted copy/move constructor/assignment operator, and T is trivially
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// destructible. Arrays of trivially copyable types are trivially copyable.
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//
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// We expose this metafunction only for internal use within absl.
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template <typename T>
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class is_trivially_copyable_impl {
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using ExtentsRemoved = typename std::remove_all_extents<T>::type;
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static constexpr bool kIsCopyOrMoveConstructible =
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std::is_copy_constructible<ExtentsRemoved>::value ||
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std::is_move_constructible<ExtentsRemoved>::value;
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static constexpr bool kIsCopyOrMoveAssignable =
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absl::is_copy_assignable<ExtentsRemoved>::value ||
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absl::is_move_assignable<ExtentsRemoved>::value;
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public:
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static constexpr bool kValue =
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(__has_trivial_copy(ExtentsRemoved) || !kIsCopyOrMoveConstructible) &&
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(__has_trivial_assign(ExtentsRemoved) || !kIsCopyOrMoveAssignable) &&
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(kIsCopyOrMoveConstructible || kIsCopyOrMoveAssignable) &&
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is_trivially_destructible<ExtentsRemoved>::value &&
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// We need to check for this explicitly because otherwise we'll say
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// references are trivial copyable when compiled by MSVC.
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!std::is_reference<ExtentsRemoved>::value;
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};
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template <typename T>
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struct is_trivially_copyable
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: std::integral_constant<
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bool, type_traits_internal::is_trivially_copyable_impl<T>::kValue> {};
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} // namespace type_traits_internal
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// -----------------------------------------------------------------------------
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// C++14 "_t" trait aliases
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// -----------------------------------------------------------------------------
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@ -280,10 +280,20 @@ class DeletedCopyAssign {
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int n_;
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};
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struct NonCopyable {
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NonCopyable() = default;
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NonCopyable(const NonCopyable&) = delete;
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NonCopyable& operator=(const NonCopyable&) = delete;
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struct MovableNonCopyable {
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MovableNonCopyable() = default;
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MovableNonCopyable(const MovableNonCopyable&) = delete;
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MovableNonCopyable(MovableNonCopyable&&) = default;
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MovableNonCopyable& operator=(const MovableNonCopyable&) = delete;
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MovableNonCopyable& operator=(MovableNonCopyable&&) = default;
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};
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struct NonCopyableOrMovable {
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NonCopyableOrMovable() = default;
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NonCopyableOrMovable(const NonCopyableOrMovable&) = delete;
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NonCopyableOrMovable(NonCopyableOrMovable&&) = delete;
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NonCopyableOrMovable& operator=(const NonCopyableOrMovable&) = delete;
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NonCopyableOrMovable& operator=(NonCopyableOrMovable&&) = delete;
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};
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class Base {
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@ -507,7 +517,9 @@ TEST(TypeTraitsTest, TestTrivialCopyCtor) {
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absl::is_trivially_copy_constructible<NontrivialCopyCtor>::value);
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EXPECT_FALSE(absl::is_trivially_copy_constructible<DeletedCopyCtor>::value);
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EXPECT_FALSE(
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absl::is_trivially_copy_constructible<NonCopyable>::value);
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absl::is_trivially_copy_constructible<MovableNonCopyable>::value);
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EXPECT_FALSE(
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absl::is_trivially_copy_constructible<NonCopyableOrMovable>::value);
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#ifdef ABSL_TRIVIALLY_CONSTRUCTIBLE_VERIFY_TRIVIALLY_DESTRUCTIBLE
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// type with nontrivial destructor are nontrivial copy construbtible
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@ -577,7 +589,8 @@ TEST(TypeTraitsTest, TestTrivialCopyAssign) {
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// Verify that types without them (i.e. nontrivial or deleted) are not.
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EXPECT_FALSE(absl::is_trivially_copy_assignable<NontrivialCopyAssign>::value);
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EXPECT_FALSE(absl::is_trivially_copy_assignable<DeletedCopyAssign>::value);
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EXPECT_FALSE(absl::is_trivially_copy_assignable<NonCopyable>::value);
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EXPECT_FALSE(absl::is_trivially_copy_assignable<MovableNonCopyable>::value);
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EXPECT_FALSE(absl::is_trivially_copy_assignable<NonCopyableOrMovable>::value);
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// types with vtables
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EXPECT_FALSE(absl::is_trivially_copy_assignable<Base>::value);
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@ -611,6 +624,116 @@ TEST(TypeTraitsTest, TestTrivialCopyAssign) {
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EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial&>::value);
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}
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TEST(TypeTraitsTest, TestTriviallyCopyable) {
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// Verify that arithmetic types and pointers are trivially copyable.
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EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<bool>::value);
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EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<char>::value);
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<unsigned char>::value);
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<signed char>::value);
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<wchar_t>::value);
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EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<int>::value);
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<unsigned int>::value);
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<int16_t>::value);
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<uint16_t>::value);
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<int64_t>::value);
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<uint64_t>::value);
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EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<float>::value);
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EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<double>::value);
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<long double>::value);
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<std::string*>::value);
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<Trivial*>::value);
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EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<
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const std::string*>::value);
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<const Trivial*>::value);
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<std::string**>::value);
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<Trivial**>::value);
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// const qualified types are not assignable but are constructible
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<const int>::value);
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// Trivial copy constructor/assignment and destructor.
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<Trivial>::value);
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// Trivial copy assignment, but non-trivial copy constructor/destructor.
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EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
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TrivialCopyAssign>::value);
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// Trivial copy constructor, but non-trivial assignment.
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EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
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TrivialCopyCtor>::value);
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// Types with a non-trivial copy constructor/assignment
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EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
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NontrivialCopyCtor>::value);
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EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
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NontrivialCopyAssign>::value);
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// Types without copy constructor/assignment, but with move
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// MSVC disagrees with other compilers about this:
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// EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<
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// MovableNonCopyable>::value);
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// Types without copy/move constructor/assignment
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EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
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NonCopyableOrMovable>::value);
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// No copy assign, but has trivial copy constructor.
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EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<
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DeletedCopyAssign>::value);
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// types with vtables
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EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<Base>::value);
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// Verify that simple_pair is trivially copyable if members are
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EXPECT_TRUE((absl::type_traits_internal::is_trivially_copyable<
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simple_pair<int, char*>>::value));
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EXPECT_TRUE((absl::type_traits_internal::is_trivially_copyable<
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simple_pair<int, Trivial>>::value));
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// Verify that types not trivially copyable are
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// correctly marked as such.
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EXPECT_FALSE(
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absl::type_traits_internal::is_trivially_copyable<std::string>::value);
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EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
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std::vector<int>>::value);
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// Verify that simple_pairs of types not trivially copyable
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// are not marked as trivial.
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EXPECT_FALSE((absl::type_traits_internal::is_trivially_copyable<
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simple_pair<int, std::string>>::value));
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EXPECT_FALSE((absl::type_traits_internal::is_trivially_copyable<
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simple_pair<std::string, int>>::value));
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EXPECT_FALSE((absl::type_traits_internal::is_trivially_copyable<
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simple_pair<int, TrivialCopyAssign>>::value));
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// Verify that arrays of trivially copyable types are trivially copyable
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using int10 = int[10];
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EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<int10>::value);
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using int10x10 = int[10][10];
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EXPECT_TRUE(
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absl::type_traits_internal::is_trivially_copyable<int10x10>::value);
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// Verify that references are handled correctly
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EXPECT_FALSE(
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absl::type_traits_internal::is_trivially_copyable<Trivial&&>::value);
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EXPECT_FALSE(
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absl::type_traits_internal::is_trivially_copyable<Trivial&>::value);
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}
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#define ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(trait_name, ...) \
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EXPECT_TRUE((std::is_same<typename std::trait_name<__VA_ARGS__>::type, \
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absl::trait_name##_t<__VA_ARGS__>>::value))
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