Export of internal Abseil changes

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c385118b3ef0528d150bfe7aeeb63e77f9e463cd by Matt Calabrese <calabrese@google.com>:

Internal-only Archetype generation for testing generic code with user-defined types of various properties.

PiperOrigin-RevId: 283833099

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4ccf340d3b295aa5b796ee5c97128b61d38899ea by Derek Mauro <dmauro@google.com>:

Fixes the flags parse_test.
Windows doesn't like consecutive path separators.

PiperOrigin-RevId: 283614649

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5df6d83acb1e49cd1da785cfaf7551f05149f3c9 by Andy Getzendanner <durandal@google.com>:

ABSL_INTERNAL_LOG: forward complete __FILE__ to internal_log_function; not just basename.

PiperOrigin-RevId: 283406080
GitOrigin-RevId: c385118b3ef0528d150bfe7aeeb63e77f9e463cd
Change-Id: Ib0782354691a73fc40185c3262cfd507085b3393

2 files changed, 37 insertions, 29 deletions

diff --git a/absl/meta/type_traits.h b/absl/meta/type_traits.h
index d57a87923136..8cd5f043e0b7 100644
--- a/absl/meta/type_traits.h
+++ b/absl/meta/type_traits.h
@@ -41,10 +41,20 @@
 
 #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 {
 
 // 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>
 struct is_trivially_move_assignable;
 
 namespace type_traits_internal {
@@ -66,6 +76,20 @@ 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>
@@ -323,7 +347,9 @@ 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 ==
@@ -354,10 +380,11 @@ 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 ==
@@ -388,10 +415,11 @@ 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 ==
@@ -423,7 +451,8 @@ 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 {
diff --git a/absl/meta/type_traits_test.cc b/absl/meta/type_traits_test.cc
index 6fbb42f82e06..1aafd0d49a83 100644
--- a/absl/meta/type_traits_test.cc
+++ b/absl/meta/type_traits_test.cc
@@ -347,21 +347,6 @@ class Base {
   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.
@@ -499,11 +484,9 @@ TEST(TypeTraitsTest, TestTrivialDefaultCtor) {
   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);
@@ -607,11 +590,9 @@ TEST(TypeTraitsTest, TestTrivialMoveCtor) {
   EXPECT_FALSE(
       absl::is_trivially_move_constructible<NonCopyableOrMovable>::value);
 
-#ifdef ABSL_TRIVIALLY_CONSTRUCTIBLE_VERIFY_TRIVIALLY_DESTRUCTIBLE
   // type with nontrivial destructor are nontrivial move construbtible
   EXPECT_FALSE(
       absl::is_trivially_move_constructible<NontrivialDestructor>::value);
-#endif
 
   // types with vtables
   EXPECT_FALSE(absl::is_trivially_move_constructible<Base>::value);
@@ -682,11 +663,9 @@ TEST(TypeTraitsTest, TestTrivialCopyCtor) {
   EXPECT_FALSE(
       absl::is_trivially_copy_constructible<NonCopyableOrMovable>::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);