Creation of LTS branch "lts_2020_02_25"20200225

  - 0033c9ea91a52ade7c6b725aa2ef3cbe15463421 Fix build on FreeBSD/powerpc (#616) by kgotlinux <60880393+kgotlinux@users.noreply.github.com>
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  - 2a5633fc077a58528cdbfe78720f3f6bfdc6044d Merge "Export of internal Abseil changes" by Xiaoyi Zhang <zhangxy@google.com>
  - f9b3d6e493c1b6ab3dbdab71c5f8fa849db4abaf Add RISCV support to GetProgramCounter() (#621) by Khem Raj <raj.khem@gmail.com>
  - 0232c87f21c26718aa3eb2d86678070f3b498a4e Add missing ABSL_HAVE_VDSO_SUPPORT conditional (#622) by Sinan Kaya <41809318+franksinankaya@users.noreply.github.com>
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  - 36bcd9599b3f48c99357ba61cf33584889306d6a Fix pointer format specifier in documentation (#614) by Andre Nguyen <andre-nguyen@users.noreply.github.com>
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  - 44427702614d7b86b064ba06a390f5eb2f85dbf6 fix: Add support for more ARM processors detection (#608) by Andre Nguyen <andre-nguyen@users.noreply.github.com>
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  - a2e6adecc294dc4cd98cc285a9134ce58e0f2ad0 Use https links. (#586) by nlewycky <nicholas@mxc.ca>
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  - 85092b4b648ca729c6263c4a302a41dfff28705e Fix Conan builds (#400) by Adrian Ostrowski <adr.ostrowski@gmail.com>
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  - ecc0033b54847f6c9ee37dbb0be8aa17e5b6d37b Always enable proper symbolize implementation on Windows ... by Loo Rong Jie <loorongjie@gmail.com>
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  - e9f9000c7c80993cb589d011616b7a8016e42f4a Fix ABSL_WAITER_MODE detection for mingw (#342) by Joe Sylve <Joe.Sylve@gmail.com>
  - abea769b551f7a100f540967cb95debdb0080df8 Fix ABSL_HAVE_ALARM check on mingw (#341) by Joe Sylve <Joe.Sylve@gmail.com>
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  - 882b3501a31eb0e4ae4213afb91a0e43feda7d5f Fix spelling errors (#384) by Sungmann Cho <55860394+chosungmann@users.noreply.github.com>
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  - 0302d1e5fa4fcdd1763b7d1bb3212943b1ae911d supppress unused variable warning for gcc (#372) by Martin <pizzard@users.noreply.github.com>
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  - 36910d3d7e9fccadd6603f232d0c4f54dcd47c7e [bazel] Add fixes for --incompatible_load_cc_rules_from_b... by Yannic <contact@yannic-bonenberger.com>
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GitOrigin-RevId: 0033c9ea91a52ade7c6b725aa2ef3cbe15463421
Change-Id: I8a2b70063cb3ab40c6943a6db0fe40cae71ed8d7

1 files changed, 54 insertions, 11 deletions

diff --git a/absl/meta/type_traits.h b/absl/meta/type_traits.h
index ae7130dd..ba87d2f0 100644
--- a/absl/meta/type_traits.h
+++ b/absl/meta/type_traits.h
@@ -41,8 +41,18 @@
 
 #include "absl/base/config.h"
 
+// MSVC constructibility traits do not detect destructor properties and so our
+// implementations should not use them as a source-of-truth.
+#if defined(_MSC_VER) && !defined(__clang__) && !defined(__GNUC__)
+#define ABSL_META_INTERNAL_STD_CONSTRUCTION_TRAITS_DONT_CHECK_DESTRUCTION 1
+#endif
+
 namespace absl {
-inline namespace lts_2019_08_08 {
+ABSL_NAMESPACE_BEGIN
+
+// Defined and documented later on in this file.
+template <typename T>
+struct is_trivially_destructible;
 
 // Defined and documented later on in this file.
 template <typename T>
@@ -67,6 +77,20 @@ union SingleMemberUnion {
 #endif  // defined(_MSC_VER) && !defined(__GNUC__)
 
 template <class T>
+struct IsTriviallyMoveConstructibleObject
+    : std::integral_constant<
+          bool, std::is_move_constructible<
+                    type_traits_internal::SingleMemberUnion<T>>::value &&
+                    absl::is_trivially_destructible<T>::value> {};
+
+template <class T>
+struct IsTriviallyCopyConstructibleObject
+    : std::integral_constant<
+          bool, std::is_copy_constructible<
+                    type_traits_internal::SingleMemberUnion<T>>::value &&
+                    absl::is_trivially_destructible<T>::value> {};
+
+template <class T>
 struct IsTriviallyMoveAssignableReference : std::false_type {};
 
 template <class T>
@@ -146,6 +170,18 @@ using IsMoveAssignableImpl = decltype(std::declval<T&>() = std::declval<T&&>());
 
 }  // namespace type_traits_internal
 
+// MSVC 19.20 has a regression that causes our workarounds to fail, but their
+// std forms now appear to be compliant.
+#if defined(_MSC_VER) && !defined(__clang__) && (_MSC_VER >= 1920)
+
+template <typename T>
+using is_copy_assignable = std::is_copy_assignable<T>;
+
+template <typename T>
+using is_move_assignable = std::is_move_assignable<T>;
+
+#else
+
 template <typename T>
 struct is_copy_assignable : type_traits_internal::is_detected<
                                 type_traits_internal::IsCopyAssignableImpl, T> {
@@ -156,6 +192,8 @@ struct is_move_assignable : type_traits_internal::is_detected<
                                 type_traits_internal::IsMoveAssignableImpl, T> {
 };
 
+#endif
+
 // void_t()
 //
 // Ignores the type of any its arguments and returns `void`. In general, this
@@ -244,7 +282,7 @@ struct is_function
 
 // is_trivially_destructible()
 //
-// Determines whether the passed type `T` is trivially destructable.
+// Determines whether the passed type `T` is trivially destructible.
 //
 // This metafunction is designed to be a drop-in replacement for the C++11
 // `std::is_trivially_destructible()` metafunction for platforms that have
@@ -310,7 +348,9 @@ struct is_trivially_default_constructible
     : std::integral_constant<bool, __has_trivial_constructor(T) &&
                                    std::is_default_constructible<T>::value &&
                                    is_trivially_destructible<T>::value> {
-#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE
+#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE) && \
+    !defined(                                            \
+        ABSL_META_INTERNAL_STD_CONSTRUCTION_TRAITS_DONT_CHECK_DESTRUCTION)
  private:
   static constexpr bool compliant =
       std::is_trivially_default_constructible<T>::value ==
@@ -341,10 +381,11 @@ template <typename T>
 struct is_trivially_move_constructible
     : std::conditional<
           std::is_object<T>::value && !std::is_array<T>::value,
-          std::is_move_constructible<
-              type_traits_internal::SingleMemberUnion<T>>,
+          type_traits_internal::IsTriviallyMoveConstructibleObject<T>,
           std::is_reference<T>>::type::type {
-#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE
+#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE) && \
+    !defined(                                            \
+        ABSL_META_INTERNAL_STD_CONSTRUCTION_TRAITS_DONT_CHECK_DESTRUCTION)
  private:
   static constexpr bool compliant =
       std::is_trivially_move_constructible<T>::value ==
@@ -375,10 +416,11 @@ template <typename T>
 struct is_trivially_copy_constructible
     : std::conditional<
           std::is_object<T>::value && !std::is_array<T>::value,
-          std::is_copy_constructible<
-              type_traits_internal::SingleMemberUnion<T>>,
+          type_traits_internal::IsTriviallyCopyConstructibleObject<T>,
           std::is_lvalue_reference<T>>::type::type {
-#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE
+#if defined(ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE) && \
+    !defined(                                            \
+        ABSL_META_INTERNAL_STD_CONSTRUCTION_TRAITS_DONT_CHECK_DESTRUCTION)
  private:
   static constexpr bool compliant =
       std::is_trivially_copy_constructible<T>::value ==
@@ -410,7 +452,8 @@ struct is_trivially_copy_constructible
 template <typename T>
 struct is_trivially_move_assignable
     : std::conditional<
-          std::is_object<T>::value && !std::is_array<T>::value,
+          std::is_object<T>::value && !std::is_array<T>::value &&
+              std::is_move_assignable<T>::value,
           std::is_move_assignable<type_traits_internal::SingleMemberUnion<T>>,
           type_traits_internal::IsTriviallyMoveAssignableReference<T>>::type::
           type {
@@ -710,7 +753,7 @@ using swap_internal::Swap;
 using swap_internal::StdSwapIsUnconstrained;
 
 }  // namespace type_traits_internal
-}  // inline namespace lts_2019_08_08
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_META_TYPE_TRAITS_H_