Export of internal Abseil changes.

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c1f3a243ff3713917eaf0255c86ddd1b40461ba9 by Abseil Team <absl-team@google.com>:

Remove stray space.

PiperOrigin-RevId: 207753171

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4abe43b174f7fafa390d2f6eb96f31977a38fc69 by Shaindel Schwartz <shaindel@google.com>:

Typo fix.

PiperOrigin-RevId: 207572868

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e7757b409256b025cadba20a84a93cb9dc4319e1 by Abseil Team <absl-team@google.com>:

Adds backported is_(copy|move)_assignable<T>

PiperOrigin-RevId: 207572180
GitOrigin-RevId: c1f3a243ff3713917eaf0255c86ddd1b40461ba9
Change-Id: I1202715e5092b54d5967017728044715d6eb2ec0

4 files changed, 26 insertions, 25 deletions

diff --git a/absl/types/internal/variant.h b/absl/types/internal/variant.h
index 7708e67c..28ae1a5a 100644
--- a/absl/types/internal/variant.h
+++ b/absl/types/internal/variant.h
@@ -1227,23 +1227,23 @@ using VariantCopyBase = absl::conditional_t<
 // Base that is dependent on whether or not the move-assign can be trivial.
 template <class... T>
 using VariantMoveAssignBase = absl::conditional_t<
-    absl::disjunction<absl::conjunction<std::is_move_assignable<Union<T...>>,
+    absl::disjunction<absl::conjunction<absl::is_move_assignable<Union<T...>>,
                                         std::is_move_constructible<Union<T...>>,
                                         std::is_destructible<Union<T...>>>,
                       absl::negation<absl::conjunction<
                           std::is_move_constructible<T>...,
-                          std::is_move_assignable<T>...>>>::value,
+                          absl::is_move_assignable<T>...>>>::value,
     VariantCopyBase<T...>, VariantMoveAssignBaseNontrivial<T...>>;
 
 // Base that is dependent on whether or not the copy-assign can be trivial.
 template <class... T>
 using VariantCopyAssignBase = absl::conditional_t<
-    absl::disjunction<absl::conjunction<std::is_copy_assignable<Union<T...>>,
+    absl::disjunction<absl::conjunction<absl::is_copy_assignable<Union<T...>>,
                                         std::is_copy_constructible<Union<T...>>,
                                         std::is_destructible<Union<T...>>>,
                       absl::negation<absl::conjunction<
                           std::is_copy_constructible<T>...,
-                          std::is_copy_assignable<T>...>>>::value,
+                          absl::is_copy_assignable<T>...>>>::value,
     VariantMoveAssignBase<T...>, VariantCopyAssignBaseNontrivial<T...>>;
 
 template <class... T>
diff --git a/absl/types/optional.h b/absl/types/optional.h
index c837cdde..79475e3e 100644
--- a/absl/types/optional.h
+++ b/absl/types/optional.h
@@ -411,10 +411,10 @@ constexpr copy_traits get_ctor_copy_traits() {
 
 template <typename T>
 constexpr copy_traits get_assign_copy_traits() {
-  return std::is_copy_assignable<T>::value &&
+  return absl::is_copy_assignable<T>::value &&
                  std::is_copy_constructible<T>::value
              ? copy_traits::copyable
-             : std::is_move_assignable<T>::value &&
+             : absl::is_move_assignable<T>::value &&
                        std::is_move_constructible<T>::value
                    ? copy_traits::movable
                    : copy_traits::non_movable;
diff --git a/absl/types/optional_test.cc b/absl/types/optional_test.cc
index 179bfd66..d90db9f8 100644
--- a/absl/types/optional_test.cc
+++ b/absl/types/optional_test.cc
@@ -607,11 +607,12 @@ TEST(optionalTest, CopyAssignment) {
   opt2_to_empty = empty;
   EXPECT_FALSE(opt2_to_empty);
 
-  EXPECT_FALSE(std::is_copy_assignable<absl::optional<const int>>::value);
-  EXPECT_TRUE(std::is_copy_assignable<absl::optional<Copyable>>::value);
-  EXPECT_FALSE(std::is_copy_assignable<absl::optional<MoveableThrow>>::value);
-  EXPECT_FALSE(std::is_copy_assignable<absl::optional<MoveableNoThrow>>::value);
-  EXPECT_FALSE(std::is_copy_assignable<absl::optional<NonMovable>>::value);
+  EXPECT_FALSE(absl::is_copy_assignable<absl::optional<const int>>::value);
+  EXPECT_TRUE(absl::is_copy_assignable<absl::optional<Copyable>>::value);
+  EXPECT_FALSE(absl::is_copy_assignable<absl::optional<MoveableThrow>>::value);
+  EXPECT_FALSE(
+      absl::is_copy_assignable<absl::optional<MoveableNoThrow>>::value);
+  EXPECT_FALSE(absl::is_copy_assignable<absl::optional<NonMovable>>::value);
 
   EXPECT_TRUE(absl::is_trivially_copy_assignable<int>::value);
   EXPECT_TRUE(absl::is_trivially_copy_assignable<volatile int>::value);
@@ -625,9 +626,9 @@ TEST(optionalTest, CopyAssignment) {
   };
 
   EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial>::value);
-  EXPECT_FALSE(std::is_copy_assignable<const Trivial>::value);
-  EXPECT_FALSE(std::is_copy_assignable<volatile Trivial>::value);
-  EXPECT_TRUE(std::is_copy_assignable<NonTrivial>::value);
+  EXPECT_FALSE(absl::is_copy_assignable<const Trivial>::value);
+  EXPECT_FALSE(absl::is_copy_assignable<volatile Trivial>::value);
+  EXPECT_TRUE(absl::is_copy_assignable<NonTrivial>::value);
   EXPECT_FALSE(absl::is_trivially_copy_assignable<NonTrivial>::value);
 
   // std::optional doesn't support volatile nontrivial types.
@@ -695,11 +696,11 @@ TEST(optionalTest, MoveAssignment) {
     EXPECT_EQ(1, listener.volatile_move_assign);
   }
 #endif  // ABSL_HAVE_STD_OPTIONAL
-  EXPECT_FALSE(std::is_move_assignable<absl::optional<const int>>::value);
-  EXPECT_TRUE(std::is_move_assignable<absl::optional<Copyable>>::value);
-  EXPECT_TRUE(std::is_move_assignable<absl::optional<MoveableThrow>>::value);
-  EXPECT_TRUE(std::is_move_assignable<absl::optional<MoveableNoThrow>>::value);
-  EXPECT_FALSE(std::is_move_assignable<absl::optional<NonMovable>>::value);
+  EXPECT_FALSE(absl::is_move_assignable<absl::optional<const int>>::value);
+  EXPECT_TRUE(absl::is_move_assignable<absl::optional<Copyable>>::value);
+  EXPECT_TRUE(absl::is_move_assignable<absl::optional<MoveableThrow>>::value);
+  EXPECT_TRUE(absl::is_move_assignable<absl::optional<MoveableNoThrow>>::value);
+  EXPECT_FALSE(absl::is_move_assignable<absl::optional<NonMovable>>::value);
 
   EXPECT_FALSE(
       std::is_nothrow_move_assignable<absl::optional<MoveableThrow>>::value);
@@ -1619,7 +1620,7 @@ TEST(optionalTest, AssignmentConstraints) {
   EXPECT_TRUE(
       (std::is_assignable<absl::optional<AnyLike>&, const AnyLike&>::value));
   EXPECT_TRUE(std::is_move_assignable<absl::optional<AnyLike>>::value);
-  EXPECT_TRUE(std::is_copy_assignable<absl::optional<AnyLike>>::value);
+  EXPECT_TRUE(absl::is_copy_assignable<absl::optional<AnyLike>>::value);
 }
 
 }  // namespace
diff --git a/absl/types/variant_test.cc b/absl/types/variant_test.cc
index 262bd944..bfb8bd7a 100644
--- a/absl/types/variant_test.cc
+++ b/absl/types/variant_test.cc
@@ -403,7 +403,7 @@ struct is_trivially_move_constructible
 
 template <class T>
 struct is_trivially_move_assignable
-    : std::is_move_assignable<SingleUnion<T>>::type {};
+    : absl::is_move_assignable<SingleUnion<T>>::type {};
 
 TEST(VariantTest, NothrowMoveConstructible) {
   // Verify that variant is nothrow move constructible iff its template
@@ -2439,14 +2439,14 @@ TEST(VariantTest, TestMoveConversionViaConvertVariantTo) {
 
 TEST(VariantTest, TestCopyAndMoveTypeTraits) {
   EXPECT_TRUE(std::is_copy_constructible<variant<std::string>>::value);
-  EXPECT_TRUE(std::is_copy_assignable<variant<std::string>>::value);
+  EXPECT_TRUE(absl::is_copy_assignable<variant<std::string>>::value);
   EXPECT_TRUE(std::is_move_constructible<variant<std::string>>::value);
-  EXPECT_TRUE(std::is_move_assignable<variant<std::string>>::value);
+  EXPECT_TRUE(absl::is_move_assignable<variant<std::string>>::value);
   EXPECT_TRUE(std::is_move_constructible<variant<std::unique_ptr<int>>>::value);
-  EXPECT_TRUE(std::is_move_assignable<variant<std::unique_ptr<int>>>::value);
+  EXPECT_TRUE(absl::is_move_assignable<variant<std::unique_ptr<int>>>::value);
   EXPECT_FALSE(
       std::is_copy_constructible<variant<std::unique_ptr<int>>>::value);
-  EXPECT_FALSE(std::is_copy_assignable<variant<std::unique_ptr<int>>>::value);
+  EXPECT_FALSE(absl::is_copy_assignable<variant<std::unique_ptr<int>>>::value);
 
   EXPECT_FALSE(
       absl::is_trivially_copy_constructible<variant<std::string>>::value);