Export of internal Abseil changes.

--
5a5dba4252e764e6737070bf0a31074bf23a3b41 by Abseil Team <absl-team@google.com>:

Internal change.

PiperOrigin-RevId: 244898913

--
3eb7d5b445ffbf08a104e39cd15aecf568417333 by Matt Calabrese <calabrese@google.com>:

Introduce absl::is_trivially_move_constructible and absl::is_trivially_move_assignable, and update the absl::is_trivially_copy_constructible and absl::is_trivially_copy_assignable traits to use similar techniques (should now be closer to the standard behavior).

PiperOrigin-RevId: 244859015

--
7da05a24fa786cab3985de0c39a186d73dcbcfb5 by Abseil Team <absl-team@google.com>:

Fix misspellings in comments in raw_hash_set.h.

PiperOrigin-RevId: 244754700

--
5c057be96048f21473d5ec45005ab4dcd8dd354f by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 244744239

--
592394e3c2e98f1238d3fb6fcb0d20c3e3739ba9 by Derek Mauro <dmauro@google.com>:

Limit the raw_hash_set prefetch test to x86-64.

PiperOrigin-RevId: 244737534

--
99ebe4e003633c8ff7838b035b31a827994879ef by Derek Mauro <dmauro@google.com>:

Workaround warning 4091 in an MSVC header.

PiperOrigin-RevId: 244701744

--
0aa23f09a32efe7985ee55b0217190f08da42477 by Abseil Team <absl-team@google.com>:

Fix comment typo.

PiperOrigin-RevId: 244659371

--
c6cdb87e9f28062c8daa29b3d8d68182ecc16383 by Derek Mauro <dmauro@google.com>:

Fix -Wundef warnings and support -Wundef.

PiperOrigin-RevId: 244244968

--
06b81245f7696b20c3c63b0618d33ac25e29cad6 by Abseil Team <absl-team@google.com>:

Fix a typo in inlined_vector.h.

PiperOrigin-RevId: 244230809

--
94877a2125d2cfe837384240e4d6551f39d737e4 by Greg Falcon <gfalcon@google.com>:

Fix sysinfo_test for emscripten.

PiperOrigin-RevId: 244198804

--
ec7783531ef7f9df2da37d341d61f7cb2bf843f0 by Shaindel Schwartz <shaindel@google.com>:

Import of CCTZ from GitHub.

Fixes #291.

PiperOrigin-RevId: 244184598

--
b652c14fa95ea206c217487ee713b11f5d1762b3 by Matt Calabrese <calabrese@google.com>:

Emulate the `in_place_index` and `in_place_type` variable templates such that they are syntactically usable in C++11 with `any` and `variant`. Also pull in the variable templates from namespace std when available.

The main observable differences here are:

1)
The types of `in_place_index_t<I>` and `in_place_type_t<T>` become function pointer types rather than structs when using the implementation that is not an alias of the std equivalents.

2)
The types of `in_place_index<I>` and `in_place_type<T>` are not directly `in_place_index_t<I>` and `in_place_type_t<T>`, but rather they become function types that decay to the corresponding function pointer types.

3)
The default constructor for `in_place_index_t` and `in_place_type_t` instantiations is no longer explicit, but for these templates I think that's less important than for something like `in_place_t` since the _type_t and _index_t versions basically never have their template parameter non-deduced when participating in overload resolution with conflicting candidates.

4) While idiomatic usage of `in_place_type_t` and `in_place_index_t` with std::variant and std::any should not be affected, there is the possibility that strange, non-idiomatic uses may be affected in the wild.

5) Default construction (rather than value-initialization) leads to a default-constructed pointer.

PiperOrigin-RevId: 244180003

--
b9ac5a96581837ffa24532117b7ea302a5569751 by Derek Mauro <dmauro@google.com>:

Fix MSVC debug assertion.

isprint is undefined for values not representable as unsigned char or
EOF.

PiperOrigin-RevId: 244083005

--
41758be6137c2f25e84b50f23938e49484be2903 by Shaindel Schwartz <shaindel@google.com>:

Update config settings for Apple platforms.

PiperOrigin-RevId: 244040587

--
c90df6a26db94b0305a0c954455a621542a89d91 by Abseil Team <absl-team@google.com>:

Internal change

PiperOrigin-RevId: 244024427

--
c71e9ceb89495354eca7d02bd905ffeaa9029aec by Derek Mauro <dmauro@google.com>:

Adds missing ABSL_DEFAULT_COPTS and ABSL_TEST_COPTS to CMakeLists.txt

Don't error on deprecated declarations in tests. It is completely
reasonable to test that code marked deprecated still works.

PiperOrigin-RevId: 244003941

--
e1326a96527a8ba9b8d120161545260da9c4562e by Abseil Team <absl-team@google.com>:

Internal change.

PiperOrigin-RevId: 243990623

--
90b8e12934c7711e1bfcc0117d21288bf9220dee by Abseil Team <absl-team@google.com>:

Add variation of absl::Base64Escape/WebSafeBase64Escape that directly returns its result.

PiperOrigin-RevId: 243894308

--
317fef3344481ebc5c35712d42f5d8a0fa64dff4 by Abseil Team <absl-team@google.com>:

Enable raw logging in Emscripten builds.

PiperOrigin-RevId: 243893705
GitOrigin-RevId: 5a5dba4252e764e6737070bf0a31074bf23a3b41
Change-Id: I19293aab73cc98d9e9bf6a9fdc30819764adb9db

2 files changed, 149 insertions, 29 deletions

diff --git a/absl/types/any_test.cc b/absl/types/any_test.cc
index a6351bf96ad1..8710472190e8 100644
--- a/absl/types/any_test.cc
+++ b/absl/types/any_test.cc
@@ -154,6 +154,14 @@ TEST(AnyTest, InPlaceConstruction) {
   EXPECT_EQ(5, v.value);
 }
 
+TEST(AnyTest, InPlaceConstructionVariableTemplate) {
+  const CopyOnly copy_only{};
+  absl::any o(absl::in_place_type<IntMoveOnlyCopyOnly>, 5, MoveOnly(),
+              copy_only);
+  auto& v = absl::any_cast<IntMoveOnlyCopyOnly&>(o);
+  EXPECT_EQ(5, v.value);
+}
+
 TEST(AnyTest, InPlaceConstructionWithCV) {
   const CopyOnly copy_only{};
   absl::any o(absl::in_place_type_t<const volatile IntMoveOnlyCopyOnly>(), 5,
@@ -162,12 +170,26 @@ TEST(AnyTest, InPlaceConstructionWithCV) {
   EXPECT_EQ(5, v.value);
 }
 
+TEST(AnyTest, InPlaceConstructionWithCVVariableTemplate) {
+  const CopyOnly copy_only{};
+  absl::any o(absl::in_place_type<const volatile IntMoveOnlyCopyOnly>, 5,
+              MoveOnly(), copy_only);
+  auto& v = absl::any_cast<IntMoveOnlyCopyOnly&>(o);
+  EXPECT_EQ(5, v.value);
+}
+
 TEST(AnyTest, InPlaceConstructionWithFunction) {
   absl::any o(absl::in_place_type_t<FunctionType>(), FunctionToEmplace);
   FunctionType*& construction_result = absl::any_cast<FunctionType*&>(o);
   EXPECT_EQ(&FunctionToEmplace, construction_result);
 }
 
+TEST(AnyTest, InPlaceConstructionWithFunctionVariableTemplate) {
+  absl::any o(absl::in_place_type<FunctionType>, FunctionToEmplace);
+  auto& construction_result = absl::any_cast<FunctionType*&>(o);
+  EXPECT_EQ(&FunctionToEmplace, construction_result);
+}
+
 TEST(AnyTest, InPlaceConstructionWithArray) {
   ArrayType ar = {5, 42};
   absl::any o(absl::in_place_type_t<ArrayType>(), ar);
@@ -175,6 +197,13 @@ TEST(AnyTest, InPlaceConstructionWithArray) {
   EXPECT_EQ(&ar[0], construction_result);
 }
 
+TEST(AnyTest, InPlaceConstructionWithArrayVariableTemplate) {
+  ArrayType ar = {5, 42};
+  absl::any o(absl::in_place_type<ArrayType>, ar);
+  auto& construction_result = absl::any_cast<DecayedArray&>(o);
+  EXPECT_EQ(&ar[0], construction_result);
+}
+
 TEST(AnyTest, InPlaceConstructionIlist) {
   const CopyOnly copy_only{};
   absl::any o(absl::in_place_type_t<ListMoveOnlyCopyOnly>(), {1, 2, 3, 4},
@@ -184,6 +213,15 @@ TEST(AnyTest, InPlaceConstructionIlist) {
   EXPECT_EQ(expected_values, v.values);
 }
 
+TEST(AnyTest, InPlaceConstructionIlistVariableTemplate) {
+  const CopyOnly copy_only{};
+  absl::any o(absl::in_place_type<ListMoveOnlyCopyOnly>, {1, 2, 3, 4},
+              MoveOnly(), copy_only);
+  auto& v = absl::any_cast<ListMoveOnlyCopyOnly&>(o);
+  std::vector<int> expected_values = {1, 2, 3, 4};
+  EXPECT_EQ(expected_values, v.values);
+}
+
 TEST(AnyTest, InPlaceConstructionIlistWithCV) {
   const CopyOnly copy_only{};
   absl::any o(absl::in_place_type_t<const volatile ListMoveOnlyCopyOnly>(),
@@ -193,11 +231,25 @@ TEST(AnyTest, InPlaceConstructionIlistWithCV) {
   EXPECT_EQ(expected_values, v.values);
 }
 
+TEST(AnyTest, InPlaceConstructionIlistWithCVVariableTemplate) {
+  const CopyOnly copy_only{};
+  absl::any o(absl::in_place_type<const volatile ListMoveOnlyCopyOnly>,
+              {1, 2, 3, 4}, MoveOnly(), copy_only);
+  auto& v = absl::any_cast<ListMoveOnlyCopyOnly&>(o);
+  std::vector<int> expected_values = {1, 2, 3, 4};
+  EXPECT_EQ(expected_values, v.values);
+}
+
 TEST(AnyTest, InPlaceNoArgs) {
   absl::any o(absl::in_place_type_t<int>{});
   EXPECT_EQ(0, absl::any_cast<int&>(o));
 }
 
+TEST(AnyTest, InPlaceNoArgsVariableTemplate) {
+  absl::any o(absl::in_place_type<int>);
+  EXPECT_EQ(0, absl::any_cast<int&>(o));
+}
+
 template <typename Enabler, typename T, typename... Args>
 struct CanEmplaceAnyImpl : std::false_type {};
 
@@ -501,7 +553,7 @@ TEST(AnyTest, Copy) {
   InstanceTracker tracker_raii;
 
   {
-    absl::any o(absl::in_place_type_t<CopyableOnlyInstance>{}, 123);
+    absl::any o(absl::in_place_type<CopyableOnlyInstance>, 123);
     CopyableOnlyInstance* f1 = absl::any_cast<CopyableOnlyInstance>(&o);
 
     absl::any o2(o);
@@ -622,7 +674,7 @@ TEST(AnyTest, ThrowBadAlloc) {
   }
 
   {
-    absl::any a(absl::in_place_type_t<int>{});
+    absl::any a(absl::in_place_type<int>);
     ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<float&>(a));
     ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<const float&>(a));
     ABSL_ANY_TEST_EXPECT_BAD_ANY_CAST(absl::any_cast<float&&>(absl::any{}));
@@ -665,7 +717,7 @@ TEST(AnyTest, FailedCopy) {
   }
 
   {
-    absl::any src(absl::in_place_type_t<BadCopyable>{});
+    absl::any src(absl::in_place_type<BadCopyable>);
     ABSL_ANY_TEST_EXPECT_BAD_COPY(absl::any{src});
   }
 
@@ -677,21 +729,21 @@ TEST(AnyTest, FailedCopy) {
 
   {
     BadCopyable bad;
-    absl::any target(absl::in_place_type_t<BadCopyable>{});
+    absl::any target(absl::in_place_type<BadCopyable>);
     ABSL_ANY_TEST_EXPECT_BAD_COPY(target = bad);
     EXPECT_TRUE(target.has_value());
   }
 
   {
-    absl::any src(absl::in_place_type_t<BadCopyable>{});
+    absl::any src(absl::in_place_type<BadCopyable>);
     absl::any target;
     ABSL_ANY_TEST_EXPECT_BAD_COPY(target = src);
     EXPECT_FALSE(target.has_value());
   }
 
   {
-    absl::any src(absl::in_place_type_t<BadCopyable>{});
-    absl::any target(absl::in_place_type_t<BadCopyable>{});
+    absl::any src(absl::in_place_type<BadCopyable>);
+    absl::any target(absl::in_place_type<BadCopyable>);
     ABSL_ANY_TEST_EXPECT_BAD_COPY(target = src);
     EXPECT_TRUE(target.has_value());
   }
@@ -707,7 +759,7 @@ TEST(AnyTest, FailedEmplace) {
 
   {
     BadCopyable bad;
-    absl::any target(absl::in_place_type_t<int>{});
+    absl::any target(absl::in_place_type<int>);
     ABSL_ANY_TEST_EXPECT_BAD_COPY(target.emplace<BadCopyable>(bad));
 #if defined(ABSL_HAVE_STD_ANY) && defined(__GLIBCXX__)
     // libstdc++ std::any::emplace() implementation (as of 7.2) has a bug: if an
diff --git a/absl/types/variant_test.cc b/absl/types/variant_test.cc
index ab40ed2a7217..b9c981181c50 100644
--- a/absl/types/variant_test.cc
+++ b/absl/types/variant_test.cc
@@ -384,7 +384,7 @@ struct MoveOnly {
 TEST(VariantTest, TestMoveConstruct) {
   using V = variant<MoveOnly<class A>, MoveOnly<class B>, MoveOnly<class C>>;
 
-  V v(in_place_index_t<1>{}, 10);
+  V v(in_place_index<1>, 10);
   V v2 = absl::move(v);
   EXPECT_EQ(10, absl::get<1>(v2).value);
 }
@@ -483,6 +483,29 @@ TEST(VariantTest, InPlaceType) {
   EXPECT_THAT(absl::get<std::vector<int>>(v5), ::testing::ElementsAre(1, 2, 3));
 }
 
+TEST(VariantTest, InPlaceTypeVariableTemplate) {
+  using Var = variant<int, std::string, NonCopyable, std::vector<int>>;
+
+  Var v1(in_place_type<int>, 7);
+  ASSERT_TRUE(absl::holds_alternative<int>(v1));
+  EXPECT_EQ(7, absl::get<int>(v1));
+
+  Var v2(in_place_type<std::string>, "ABC");
+  ASSERT_TRUE(absl::holds_alternative<std::string>(v2));
+  EXPECT_EQ("ABC", absl::get<std::string>(v2));
+
+  Var v3(in_place_type<std::string>, "ABC", 2);
+  ASSERT_TRUE(absl::holds_alternative<std::string>(v3));
+  EXPECT_EQ("AB", absl::get<std::string>(v3));
+
+  Var v4(in_place_type<NonCopyable>);
+  ASSERT_TRUE(absl::holds_alternative<NonCopyable>(v4));
+
+  Var v5(in_place_type<std::vector<int>>, {1, 2, 3});
+  ASSERT_TRUE(absl::holds_alternative<std::vector<int>>(v5));
+  EXPECT_THAT(absl::get<std::vector<int>>(v5), ::testing::ElementsAre(1, 2, 3));
+}
+
 TEST(VariantTest, InPlaceTypeInitializerList) {
   using Var =
       variant<int, std::string, NonCopyable, MoveOnlyWithListConstructor>;
@@ -492,6 +515,15 @@ TEST(VariantTest, InPlaceTypeInitializerList) {
   EXPECT_EQ(6, absl::get<MoveOnlyWithListConstructor>(v1).value);
 }
 
+TEST(VariantTest, InPlaceTypeInitializerListVariabletemplate) {
+  using Var =
+      variant<int, std::string, NonCopyable, MoveOnlyWithListConstructor>;
+
+  Var v1(in_place_type<MoveOnlyWithListConstructor>, {1, 2, 3, 4, 5}, 6);
+  ASSERT_TRUE(absl::holds_alternative<MoveOnlyWithListConstructor>(v1));
+  EXPECT_EQ(6, absl::get<MoveOnlyWithListConstructor>(v1).value);
+}
+
 TEST(VariantTest, InPlaceIndex) {
   using Var = variant<int, std::string, NonCopyable, std::vector<int>>;
 
@@ -519,6 +551,33 @@ TEST(VariantTest, InPlaceIndex) {
   EXPECT_THAT(absl::get<std::vector<int>>(v5), ::testing::ElementsAre(1, 2, 3));
 }
 
+TEST(VariantTest, InPlaceIndexVariableTemplate) {
+  using Var = variant<int, std::string, NonCopyable, std::vector<int>>;
+
+  Var v1(in_place_index<0>, 7);
+  ASSERT_TRUE(absl::holds_alternative<int>(v1));
+  EXPECT_EQ(7, absl::get<int>(v1));
+
+  Var v2(in_place_index<1>, "ABC");
+  ASSERT_TRUE(absl::holds_alternative<std::string>(v2));
+  EXPECT_EQ("ABC", absl::get<std::string>(v2));
+
+  Var v3(in_place_index<1>, "ABC", 2);
+  ASSERT_TRUE(absl::holds_alternative<std::string>(v3));
+  EXPECT_EQ("AB", absl::get<std::string>(v3));
+
+  Var v4(in_place_index<2>);
+  EXPECT_TRUE(absl::holds_alternative<NonCopyable>(v4));
+
+  // Verify that a variant with only non-copyables can still be constructed.
+  EXPECT_TRUE(absl::holds_alternative<NonCopyable>(
+      variant<NonCopyable>(in_place_index<0>)));
+
+  Var v5(in_place_index<3>, {1, 2, 3});
+  ASSERT_TRUE(absl::holds_alternative<std::vector<int>>(v5));
+  EXPECT_THAT(absl::get<std::vector<int>>(v5), ::testing::ElementsAre(1, 2, 3));
+}
+
 TEST(VariantTest, InPlaceIndexInitializerList) {
   using Var =
       variant<int, std::string, NonCopyable, MoveOnlyWithListConstructor>;
@@ -528,6 +587,15 @@ TEST(VariantTest, InPlaceIndexInitializerList) {
   EXPECT_EQ(6, absl::get<MoveOnlyWithListConstructor>(v1).value);
 }
 
+TEST(VariantTest, InPlaceIndexInitializerListVariableTemplate) {
+  using Var =
+      variant<int, std::string, NonCopyable, MoveOnlyWithListConstructor>;
+
+  Var v1(in_place_index<3>, {1, 2, 3, 4, 5}, 6);
+  ASSERT_TRUE(absl::holds_alternative<MoveOnlyWithListConstructor>(v1));
+  EXPECT_EQ(6, absl::get<MoveOnlyWithListConstructor>(v1).value);
+}
+
 ////////////////////
 // [variant.dtor] //
 ////////////////////
@@ -576,7 +644,7 @@ TEST(VariantTest, TestDtorValuelessByException)
   {
     using Variant = VariantFactory<IncrementInDtor>::Type;
 
-    Variant v(in_place_index_t<0>(), counter_adjuster);
+    Variant v(in_place_index<0>, counter_adjuster);
     EXPECT_EQ(0, counter);
 
     ToValuelessByException(v);
@@ -810,7 +878,7 @@ TEST(VariantTest, TestBackupAssign) {
 TEST(VariantTest, TestEmplaceBasic) {
   using Variant = variant<int, char>;
 
-  Variant v(absl::in_place_index_t<0>{}, 0);
+  Variant v(absl::in_place_index<0>, 0);
 
   {
     char& emplace_result = v.emplace<char>();
@@ -837,7 +905,7 @@ TEST(VariantTest, TestEmplaceInitializerList) {
   using Var =
       variant<int, std::string, NonCopyable, MoveOnlyWithListConstructor>;
 
-  Var v1(absl::in_place_index_t<0>{}, 555);
+  Var v1(absl::in_place_index<0>, 555);
   MoveOnlyWithListConstructor& emplace_result =
       v1.emplace<MoveOnlyWithListConstructor>({1, 2, 3, 4, 5}, 6);
   ASSERT_TRUE(absl::holds_alternative<MoveOnlyWithListConstructor>(v1));
@@ -848,7 +916,7 @@ TEST(VariantTest, TestEmplaceInitializerList) {
 TEST(VariantTest, TestEmplaceIndex) {
   using Variant = variant<int, char>;
 
-  Variant v(absl::in_place_index_t<0>{}, 555);
+  Variant v(absl::in_place_index<0>, 555);
 
   {
     char& emplace_result = v.emplace<1>();
@@ -875,7 +943,7 @@ TEST(VariantTest, TestEmplaceIndexInitializerList) {
   using Var =
       variant<int, std::string, NonCopyable, MoveOnlyWithListConstructor>;
 
-  Var v1(absl::in_place_index_t<0>{}, 555);
+  Var v1(absl::in_place_index<0>, 555);
   MoveOnlyWithListConstructor& emplace_result =
       v1.emplace<3>({1, 2, 3, 4, 5}, 6);
   ASSERT_TRUE(absl::holds_alternative<MoveOnlyWithListConstructor>(v1));
@@ -924,7 +992,7 @@ TEST(VariantTest, NotValuelessByException) {
 TEST(VariantTest, IndexValuelessByException) {
   using Var = variant<MoveCanThrow, std::string, double>;
 
-  Var v(absl::in_place_index_t<0>{});
+  Var v(absl::in_place_index<0>);
   EXPECT_EQ(0, v.index());
   ToValuelessByException(v);
   EXPECT_EQ(absl::variant_npos, v.index());
@@ -935,7 +1003,7 @@ TEST(VariantTest, IndexValuelessByException) {
 TEST(VariantTest, ValuelessByException) {
   using Var = variant<MoveCanThrow, std::string, double>;
 
-  Var v(absl::in_place_index_t<0>{});
+  Var v(absl::in_place_index<0>);
   EXPECT_FALSE(v.valueless_by_exception());
   ToValuelessByException(v);
   EXPECT_TRUE(v.valueless_by_exception());
@@ -966,7 +1034,7 @@ TEST(VariantTest, MemberSwap) {
   using V = variant<MoveCanThrow, std::string, int>;
   int i = 33;
   std::string s = "abc";
-  V valueless(in_place_index_t<0>{});
+  V valueless(in_place_index<0>);
   ToValuelessByException(valueless);
   {
     // lhs and rhs holds different alternative
@@ -1127,7 +1195,7 @@ TEST(VariantTest, GetIndex) {
   using Var = variant<int, std::string, double, int>;
 
   {
-    Var v(absl::in_place_index_t<0>{}, 0);
+    Var v(absl::in_place_index<0>, 0);
 
     using LValueGetType = decltype(absl::get<0>(v));
     using RValueGetType = decltype(absl::get<0>(absl::move(v)));
@@ -1187,7 +1255,7 @@ TEST(VariantTest, GetIndex) {
   }
 
   {
-    Var v(absl::in_place_index_t<0>{}, 0);
+    Var v(absl::in_place_index<0>, 0);
     v.emplace<3>(1);
 
     using LValueGetType = decltype(absl::get<3>(v));
@@ -1334,7 +1402,7 @@ TEST(VariantTest, GetIfIndex) {
   using Var = variant<int, std::string, double, int>;
 
   {
-    Var v(absl::in_place_index_t<0>{}, 0);
+    Var v(absl::in_place_index<0>, 0);
     EXPECT_TRUE(noexcept(absl::get_if<0>(&v)));
 
     {
@@ -1492,7 +1560,7 @@ TEST(VariantTest, GetIfIndex) {
   }
 
   {
-    Var v(absl::in_place_index_t<0>{}, 0);
+    Var v(absl::in_place_index<0>, 0);
     v.emplace<3>(1);
     EXPECT_TRUE(noexcept(absl::get_if<3>(&v)));
 
@@ -1638,8 +1706,8 @@ TEST(VariantTest, OperatorRelational) {
 
 TEST(VariantTest, ValuelessOperatorEquals) {
   variant<MoveCanThrow, std::string> int_v(1), string_v("Hello"),
-      valueless(absl::in_place_index_t<0>{}),
-      other_valueless(absl::in_place_index_t<0>{});
+      valueless(absl::in_place_index<0>),
+      other_valueless(absl::in_place_index<0>);
   ToValuelessByException(valueless);
   ToValuelessByException(other_valueless);
 
@@ -1660,8 +1728,8 @@ TEST(VariantTest, ValuelessOperatorEquals) {
 
 TEST(VariantTest, ValuelessOperatorRelational) {
   variant<MoveCanThrow, std::string> int_v(1), string_v("Hello"),
-      valueless(absl::in_place_index_t<0>{}),
-      other_valueless(absl::in_place_index_t<0>{});
+      valueless(absl::in_place_index<0>),
+      other_valueless(absl::in_place_index<0>);
   ToValuelessByException(valueless);
   ToValuelessByException(other_valueless);
 
@@ -2008,8 +2076,8 @@ TEST(VariantTest, Hash) {
 #if !(defined(_MSC_VER) && defined(ABSL_HAVE_STD_VARIANT))
   {
     // same value as different alternative
-    variant<int, int> v0(in_place_index_t<0>{}, 42);
-    variant<int, int> v1(in_place_index_t<1>{}, 42);
+    variant<int, int> v0(in_place_index<0>, 42);
+    variant<int, int> v1(in_place_index<1>, 42);
     std::hash<variant<int, int>> hash;
     EXPECT_NE(hash(v0), hash(v1));
   }
@@ -2605,7 +2673,7 @@ TEST(VariantTest, MoveCtorBug) {
   };
   {
     using V = absl::variant<TrivialCopyNontrivialMove, int>;
-    V v1(absl::in_place_index_t<0>{});
+    V v1(absl::in_place_index<0>);
     // this should invoke the move ctor, rather than the trivial copy ctor.
     V v2(std::move(v1));
     EXPECT_TRUE(absl::get<0>(v2).called);
@@ -2613,7 +2681,7 @@ TEST(VariantTest, MoveCtorBug) {
   {
     // this case failed to compile before our fix due to a GCC bug.
     using V = absl::variant<int, TrivialCopyNontrivialMove>;
-    V v1(absl::in_place_index_t<1>{});
+    V v1(absl::in_place_index<1>);
     // this should invoke the move ctor, rather than the trivial copy ctor.
     V v2(std::move(v1));
     EXPECT_TRUE(absl::get<1>(v2).called);