Creation of LTS branch "lts_2019_08_08"20190808

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  - 27c30ec671cb7b5ba84c4e79feff7fd0b0ac6338 Avoid undefined behavior when nullptr is passed to memcpy... by Roman Gershman <romange@gmail.com>
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  - 253eb7416421661873afbaa33828a850db978541 [CMake] Set correct flags for clang-cl (#278) by Loo Rong Jie <loorongjie@gmail.com>
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  - c1cecb25a94c075725e9d2640f6b978a8f61957b Implement Span::first and Span::last from C++20 (#274) by Girts <girtsf@users.noreply.github.com>
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  - 6b4201f9ef650637510a21b8d6cbcc3bee4a606f Fix GCC8 warnings by Boris Staletic <boris.staletic@gmail.com>
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GitOrigin-RevId: 9ee91d3e430fb33a4590486573792eb0fa146c2d
Change-Id: Ia06e548bc106cc9d136f6c65714be6645317aced

1 files changed, 418 insertions, 7 deletions

diff --git a/absl/meta/type_traits_test.cc b/absl/meta/type_traits_test.cc
index f51f5ded..a7a9c5c9 100644
--- a/absl/meta/type_traits_test.cc
+++ b/absl/meta/type_traits_test.cc
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//      http://www.apache.org/licenses/LICENSE-2.0
+//      https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ -214,6 +214,29 @@ class DeletedDefaultCtor {
   int n_;
 };
 
+class TrivialMoveCtor {
+ public:
+  explicit TrivialMoveCtor(int n) : n_(n) {}
+  TrivialMoveCtor(TrivialMoveCtor&&) = default;
+  TrivialMoveCtor& operator=(const TrivialMoveCtor& t) {
+    n_ = t.n_;
+    return *this;
+  }
+
+ private:
+  int n_;
+};
+
+class NontrivialMoveCtor {
+ public:
+  explicit NontrivialMoveCtor(int n) : n_(n) {}
+  NontrivialMoveCtor(NontrivialMoveCtor&& t) noexcept : n_(t.n_) {}
+  NontrivialMoveCtor& operator=(const NontrivialMoveCtor&) = default;
+
+ private:
+  int n_;
+};
+
 class TrivialCopyCtor {
  public:
   explicit TrivialCopyCtor(int n) : n_(n) {}
@@ -247,6 +270,29 @@ class DeletedCopyCtor {
   int n_;
 };
 
+class TrivialMoveAssign {
+ public:
+  explicit TrivialMoveAssign(int n) : n_(n) {}
+  TrivialMoveAssign(const TrivialMoveAssign& t) : n_(t.n_) {}
+  TrivialMoveAssign& operator=(TrivialMoveAssign&&) = default;
+  ~TrivialMoveAssign() {}  // can have nontrivial destructor
+ private:
+  int n_;
+};
+
+class NontrivialMoveAssign {
+ public:
+  explicit NontrivialMoveAssign(int n) : n_(n) {}
+  NontrivialMoveAssign(const NontrivialMoveAssign&) = default;
+  NontrivialMoveAssign& operator=(NontrivialMoveAssign&& t) noexcept {
+    n_ = t.n_;
+    return *this;
+  }
+
+ private:
+  int n_;
+};
+
 class TrivialCopyAssign {
  public:
   explicit TrivialCopyAssign(int n) : n_(n) {}
@@ -280,10 +326,20 @@ class DeletedCopyAssign {
   int n_;
 };
 
-struct NonCopyable {
-  NonCopyable() = default;
-  NonCopyable(const NonCopyable&) = delete;
-  NonCopyable& operator=(const NonCopyable&) = delete;
+struct MovableNonCopyable {
+  MovableNonCopyable() = default;
+  MovableNonCopyable(const MovableNonCopyable&) = delete;
+  MovableNonCopyable(MovableNonCopyable&&) = default;
+  MovableNonCopyable& operator=(const MovableNonCopyable&) = delete;
+  MovableNonCopyable& operator=(MovableNonCopyable&&) = default;
+};
+
+struct NonCopyableOrMovable {
+  NonCopyableOrMovable() = default;
+  NonCopyableOrMovable(const NonCopyableOrMovable&) = delete;
+  NonCopyableOrMovable(NonCopyableOrMovable&&) = delete;
+  NonCopyableOrMovable& operator=(const NonCopyableOrMovable&) = delete;
+  NonCopyableOrMovable& operator=(NonCopyableOrMovable&&) = delete;
 };
 
 class Base {
@@ -329,6 +385,22 @@ class Base {
 #define ABSL_GCC_BUG_TRIVIALLY_CONSTRUCTIBLE_ON_ARRAY_OF_NONTRIVIAL 1
 #endif
 
+TEST(TypeTraitsTest, TestIsFunction) {
+  struct Callable {
+    void operator()() {}
+  };
+  EXPECT_TRUE(absl::is_function<void()>::value);
+  EXPECT_TRUE(absl::is_function<void()&>::value);
+  EXPECT_TRUE(absl::is_function<void() const>::value);
+  EXPECT_TRUE(absl::is_function<void() noexcept>::value);
+  EXPECT_TRUE(absl::is_function<void(...) noexcept>::value);
+
+  EXPECT_FALSE(absl::is_function<void(*)()>::value);
+  EXPECT_FALSE(absl::is_function<void(&)()>::value);
+  EXPECT_FALSE(absl::is_function<int>::value);
+  EXPECT_FALSE(absl::is_function<Callable>::value);
+}
+
 TEST(TypeTraitsTest, TestTrivialDestructor) {
   // Verify that arithmetic types and pointers have trivial destructors.
   EXPECT_TRUE(absl::is_trivially_destructible<bool>::value);
@@ -474,6 +546,79 @@ TEST(TypeTraitsTest, TestTrivialDefaultCtor) {
 #endif
 }
 
+TEST(TypeTraitsTest, TestTrivialMoveCtor) {
+  // Verify that arithmetic types and pointers have trivial move
+  // constructors.
+  EXPECT_TRUE(absl::is_trivially_move_constructible<bool>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<char>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<unsigned char>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<signed char>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<wchar_t>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<int>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<unsigned int>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<int16_t>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<uint16_t>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<int64_t>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<uint64_t>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<float>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<double>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<long double>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<std::string*>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<Trivial*>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<const std::string*>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<const Trivial*>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<std::string**>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<Trivial**>::value);
+
+  // Reference types
+  EXPECT_TRUE(absl::is_trivially_move_constructible<int&>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<int&&>::value);
+
+  // types with compiler generated move ctors
+  EXPECT_TRUE(absl::is_trivially_move_constructible<Trivial>::value);
+  EXPECT_TRUE(absl::is_trivially_move_constructible<TrivialMoveCtor>::value);
+
+  // Verify that types without them (i.e. nontrivial or deleted) are not.
+  EXPECT_FALSE(
+      absl::is_trivially_move_constructible<NontrivialCopyCtor>::value);
+  EXPECT_FALSE(absl::is_trivially_move_constructible<DeletedCopyCtor>::value);
+  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);
+
+  // Verify that simple_pair of such types is trivially move constructible
+  EXPECT_TRUE(
+      (absl::is_trivially_move_constructible<simple_pair<int, char*>>::value));
+  EXPECT_TRUE((
+      absl::is_trivially_move_constructible<simple_pair<int, Trivial>>::value));
+  EXPECT_TRUE((absl::is_trivially_move_constructible<
+               simple_pair<int, TrivialMoveCtor>>::value));
+
+  // Verify that types without trivial move constructors are
+  // correctly marked as such.
+  EXPECT_FALSE(absl::is_trivially_move_constructible<std::string>::value);
+  EXPECT_FALSE(absl::is_trivially_move_constructible<std::vector<int>>::value);
+
+  // Verify that simple_pairs of types without trivial move constructors
+  // are not marked as trivial.
+  EXPECT_FALSE((absl::is_trivially_move_constructible<
+                simple_pair<int, std::string>>::value));
+  EXPECT_FALSE((absl::is_trivially_move_constructible<
+                simple_pair<std::string, int>>::value));
+
+  // Verify that arrays are not
+  using int10 = int[10];
+  EXPECT_FALSE(absl::is_trivially_move_constructible<int10>::value);
+}
+
 TEST(TypeTraitsTest, TestTrivialCopyCtor) {
   // Verify that arithmetic types and pointers have trivial copy
   // constructors.
@@ -498,6 +643,10 @@ TEST(TypeTraitsTest, TestTrivialCopyCtor) {
   EXPECT_TRUE(absl::is_trivially_copy_constructible<std::string**>::value);
   EXPECT_TRUE(absl::is_trivially_copy_constructible<Trivial**>::value);
 
+  // Reference types
+  EXPECT_TRUE(absl::is_trivially_copy_constructible<int&>::value);
+  EXPECT_FALSE(absl::is_trivially_copy_constructible<int&&>::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);
@@ -507,7 +656,9 @@ TEST(TypeTraitsTest, TestTrivialCopyCtor) {
       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);
+      absl::is_trivially_copy_constructible<MovableNonCopyable>::value);
+  EXPECT_FALSE(
+      absl::is_trivially_copy_constructible<NonCopyableOrMovable>::value);
 
 #ifdef ABSL_TRIVIALLY_CONSTRUCTIBLE_VERIFY_TRIVIALLY_DESTRUCTIBLE
   // type with nontrivial destructor are nontrivial copy construbtible
@@ -543,6 +694,74 @@ TEST(TypeTraitsTest, TestTrivialCopyCtor) {
   EXPECT_FALSE(absl::is_trivially_copy_constructible<int10>::value);
 }
 
+TEST(TypeTraitsTest, TestTrivialMoveAssign) {
+  // Verify that arithmetic types and pointers have trivial move
+  // assignment operators.
+  EXPECT_TRUE(absl::is_trivially_move_assignable<bool>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<char>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<unsigned char>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<signed char>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<wchar_t>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<int>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<unsigned int>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<int16_t>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<uint16_t>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<int64_t>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<uint64_t>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<float>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<double>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<long double>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<std::string*>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial*>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<const std::string*>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<const Trivial*>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<std::string**>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial**>::value);
+
+  // const qualified types are not assignable
+  EXPECT_FALSE(absl::is_trivially_move_assignable<const int>::value);
+
+  // types with compiler generated move assignment
+  EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<TrivialMoveAssign>::value);
+
+  // Verify that types without them (i.e. nontrivial or deleted) are not.
+  EXPECT_FALSE(absl::is_trivially_move_assignable<NontrivialCopyAssign>::value);
+  EXPECT_FALSE(absl::is_trivially_move_assignable<DeletedCopyAssign>::value);
+  EXPECT_FALSE(absl::is_trivially_move_assignable<NonCopyableOrMovable>::value);
+
+  // types with vtables
+  EXPECT_FALSE(absl::is_trivially_move_assignable<Base>::value);
+
+  // Verify that simple_pair is trivially assignable
+  EXPECT_TRUE(
+      (absl::is_trivially_move_assignable<simple_pair<int, char*>>::value));
+  EXPECT_TRUE(
+      (absl::is_trivially_move_assignable<simple_pair<int, Trivial>>::value));
+  EXPECT_TRUE((absl::is_trivially_move_assignable<
+               simple_pair<int, TrivialMoveAssign>>::value));
+
+  // Verify that types not trivially move assignable are
+  // correctly marked as such.
+  EXPECT_FALSE(absl::is_trivially_move_assignable<std::string>::value);
+  EXPECT_FALSE(absl::is_trivially_move_assignable<std::vector<int>>::value);
+
+  // Verify that simple_pairs of types not trivially move assignable
+  // are not marked as trivial.
+  EXPECT_FALSE((absl::is_trivially_move_assignable<
+                simple_pair<int, std::string>>::value));
+  EXPECT_FALSE((absl::is_trivially_move_assignable<
+                simple_pair<std::string, int>>::value));
+
+  // Verify that arrays are not trivially move assignable
+  using int10 = int[10];
+  EXPECT_FALSE(absl::is_trivially_move_assignable<int10>::value);
+
+  // Verify that references are handled correctly
+  EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial&&>::value);
+  EXPECT_TRUE(absl::is_trivially_move_assignable<Trivial&>::value);
+}
+
 TEST(TypeTraitsTest, TestTrivialCopyAssign) {
   // Verify that arithmetic types and pointers have trivial copy
   // assignment operators.
@@ -577,7 +796,8 @@ TEST(TypeTraitsTest, TestTrivialCopyAssign) {
   // 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);
+  EXPECT_FALSE(absl::is_trivially_copy_assignable<MovableNonCopyable>::value);
+  EXPECT_FALSE(absl::is_trivially_copy_assignable<NonCopyableOrMovable>::value);
 
   // types with vtables
   EXPECT_FALSE(absl::is_trivially_copy_assignable<Base>::value);
@@ -611,6 +831,116 @@ TEST(TypeTraitsTest, TestTrivialCopyAssign) {
   EXPECT_TRUE(absl::is_trivially_copy_assignable<Trivial&>::value);
 }
 
+TEST(TypeTraitsTest, TestTriviallyCopyable) {
+  // Verify that arithmetic types and pointers are trivially copyable.
+  EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<bool>::value);
+  EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<char>::value);
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<unsigned char>::value);
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<signed char>::value);
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<wchar_t>::value);
+  EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<int>::value);
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<unsigned int>::value);
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<int16_t>::value);
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<uint16_t>::value);
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<int64_t>::value);
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<uint64_t>::value);
+  EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<float>::value);
+  EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<double>::value);
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<long double>::value);
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<std::string*>::value);
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<Trivial*>::value);
+  EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<
+              const std::string*>::value);
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<const Trivial*>::value);
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<std::string**>::value);
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<Trivial**>::value);
+
+  // const qualified types are not assignable but are constructible
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<const int>::value);
+
+  // Trivial copy constructor/assignment and destructor.
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<Trivial>::value);
+  // Trivial copy assignment, but non-trivial copy constructor/destructor.
+  EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
+               TrivialCopyAssign>::value);
+  // Trivial copy constructor, but non-trivial assignment.
+  EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
+               TrivialCopyCtor>::value);
+
+  // Types with a non-trivial copy constructor/assignment
+  EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
+               NontrivialCopyCtor>::value);
+  EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
+               NontrivialCopyAssign>::value);
+
+  // Types without copy constructor/assignment, but with move
+  // MSVC disagrees with other compilers about this:
+  // EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<
+  //             MovableNonCopyable>::value);
+
+  // Types without copy/move constructor/assignment
+  EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
+               NonCopyableOrMovable>::value);
+
+  // No copy assign, but has trivial copy constructor.
+  EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<
+              DeletedCopyAssign>::value);
+
+  // types with vtables
+  EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<Base>::value);
+
+  // Verify that simple_pair is trivially copyable if members are
+  EXPECT_TRUE((absl::type_traits_internal::is_trivially_copyable<
+               simple_pair<int, char*>>::value));
+  EXPECT_TRUE((absl::type_traits_internal::is_trivially_copyable<
+               simple_pair<int, Trivial>>::value));
+
+  // Verify that types not trivially copyable are
+  // correctly marked as such.
+  EXPECT_FALSE(
+      absl::type_traits_internal::is_trivially_copyable<std::string>::value);
+  EXPECT_FALSE(absl::type_traits_internal::is_trivially_copyable<
+               std::vector<int>>::value);
+
+  // Verify that simple_pairs of types not trivially copyable
+  // are not marked as trivial.
+  EXPECT_FALSE((absl::type_traits_internal::is_trivially_copyable<
+                simple_pair<int, std::string>>::value));
+  EXPECT_FALSE((absl::type_traits_internal::is_trivially_copyable<
+                simple_pair<std::string, int>>::value));
+  EXPECT_FALSE((absl::type_traits_internal::is_trivially_copyable<
+                simple_pair<int, TrivialCopyAssign>>::value));
+
+  // Verify that arrays of trivially copyable types are trivially copyable
+  using int10 = int[10];
+  EXPECT_TRUE(absl::type_traits_internal::is_trivially_copyable<int10>::value);
+  using int10x10 = int[10][10];
+  EXPECT_TRUE(
+      absl::type_traits_internal::is_trivially_copyable<int10x10>::value);
+
+  // Verify that references are handled correctly
+  EXPECT_FALSE(
+      absl::type_traits_internal::is_trivially_copyable<Trivial&&>::value);
+  EXPECT_FALSE(
+      absl::type_traits_internal::is_trivially_copyable<Trivial&>::value);
+}
+
 #define ABSL_INTERNAL_EXPECT_ALIAS_EQUIVALENCE(trait_name, ...)          \
   EXPECT_TRUE((std::is_same<typename std::trait_name<__VA_ARGS__>::type, \
                             absl::trait_name##_t<__VA_ARGS__>>::value))
@@ -953,4 +1283,85 @@ TEST(TypeTraitsTest, IsMoveAssignable) {
 #endif  // _LIBCPP_VERSION
 }
 
+namespace adl_namespace {
+
+struct DeletedSwap {
+};
+
+void swap(DeletedSwap&, DeletedSwap&) = delete;
+
+struct SpecialNoexceptSwap {
+  SpecialNoexceptSwap(SpecialNoexceptSwap&&) {}
+  SpecialNoexceptSwap& operator=(SpecialNoexceptSwap&&) { return *this; }
+  ~SpecialNoexceptSwap() = default;
+};
+
+void swap(SpecialNoexceptSwap&, SpecialNoexceptSwap&) noexcept {}
+
+}  // namespace adl_namespace
+
+TEST(TypeTraitsTest, IsSwappable) {
+  using absl::type_traits_internal::IsSwappable;
+  using absl::type_traits_internal::StdSwapIsUnconstrained;
+
+  EXPECT_TRUE(IsSwappable<int>::value);
+
+  struct S {};
+  EXPECT_TRUE(IsSwappable<S>::value);
+
+  struct NoConstruct {
+    NoConstruct(NoConstruct&&) = delete;
+    NoConstruct& operator=(NoConstruct&&) { return *this; }
+    ~NoConstruct() = default;
+  };
+
+  EXPECT_EQ(IsSwappable<NoConstruct>::value, StdSwapIsUnconstrained::value);
+  struct NoAssign {
+    NoAssign(NoAssign&&) {}
+    NoAssign& operator=(NoAssign&&) = delete;
+    ~NoAssign() = default;
+  };
+
+  EXPECT_EQ(IsSwappable<NoAssign>::value, StdSwapIsUnconstrained::value);
+
+  EXPECT_FALSE(IsSwappable<adl_namespace::DeletedSwap>::value);
+
+  EXPECT_TRUE(IsSwappable<adl_namespace::SpecialNoexceptSwap>::value);
+}
+
+TEST(TypeTraitsTest, IsNothrowSwappable) {
+  using absl::type_traits_internal::IsNothrowSwappable;
+  using absl::type_traits_internal::StdSwapIsUnconstrained;
+
+  EXPECT_TRUE(IsNothrowSwappable<int>::value);
+
+  struct NonNoexceptMoves {
+    NonNoexceptMoves(NonNoexceptMoves&&) {}
+    NonNoexceptMoves& operator=(NonNoexceptMoves&&) { return *this; }
+    ~NonNoexceptMoves() = default;
+  };
+
+  EXPECT_FALSE(IsNothrowSwappable<NonNoexceptMoves>::value);
+
+  struct NoConstruct {
+    NoConstruct(NoConstruct&&) = delete;
+    NoConstruct& operator=(NoConstruct&&) { return *this; }
+    ~NoConstruct() = default;
+  };
+
+  EXPECT_FALSE(IsNothrowSwappable<NoConstruct>::value);
+
+  struct NoAssign {
+    NoAssign(NoAssign&&) {}
+    NoAssign& operator=(NoAssign&&) = delete;
+    ~NoAssign() = default;
+  };
+
+  EXPECT_FALSE(IsNothrowSwappable<NoAssign>::value);
+
+  EXPECT_FALSE(IsNothrowSwappable<adl_namespace::DeletedSwap>::value);
+
+  EXPECT_TRUE(IsNothrowSwappable<adl_namespace::SpecialNoexceptSwap>::value);
+}
+
 }  // namespace