Export of internal Abseil changes

--
d857e6e1f9b09a3eb5abd890677a98b23346f07a by Abseil Team <absl-team@google.com>:

Simplify internal TryAcquireWithSpinning.

No point declaring the `result` variable: we can just return the results
directly.

PiperOrigin-RevId: 307045800

--
421952252bc23be51f47f7d23f3422bad1ed382c by Derek Mauro <dmauro@google.com>:

Add custom sink support for `absl::Format()` through an ADL extension mechanism.

Users can now define
`void AbslFormatFlush(MySink* dest, absl::string_view part)`
to allow `absl::Format()` to append to a custom sink.

PiperOrigin-RevId: 306929052

--
c73d5cdb62cd58ea421ed1aeeab78a0ffcfeeefb by Matt Calabrese <calabrese@google.com>:

Internal-only conformance-testing macro ABSL_INTERNAL_ASSERT_CONFORMANCE_OF for compile-time and runtime checks of a specified type, expected properties of that type, and a logically-ordered series of equivalence classes of that type.

PiperOrigin-RevId: 306885512

--
a8c2495a07f37d68907855e3f0535bd5c27a3b52 by Abseil Team <absl-team@google.com>:

Internal change

PiperOrigin-RevId: 306766753
GitOrigin-RevId: d857e6e1f9b09a3eb5abd890677a98b23346f07a
Change-Id: Ic23c92ac74f9ffcbb2471ff8c6691f4b7b20354b

8 files changed, 3016 insertions, 24 deletions

diff --git a/absl/types/BUILD.bazel b/absl/types/BUILD.bazel
index c64417cc6f05..de71c7347fe8 100644
--- a/absl/types/BUILD.bazel
+++ b/absl/types/BUILD.bazel
@@ -216,11 +216,15 @@ cc_library(
         "internal/conformance_aliases.h",
         "internal/conformance_archetype.h",
         "internal/conformance_profile.h",
+        "internal/conformance_testing.h",
+        "internal/conformance_testing_helpers.h",
+        "internal/parentheses.h",
+        "internal/transform_args.h",
     ],
     copts = ABSL_TEST_COPTS,
     linkopts = ABSL_DEFAULT_LINKOPTS,
     deps = [
-        "//absl/debugging:demangle_internal",
+        "//absl/algorithm:container",
         "//absl/meta:type_traits",
         "//absl/strings",
         "//absl/utility",
diff --git a/absl/types/CMakeLists.txt b/absl/types/CMakeLists.txt
index 1b4d453b2efe..71b339ae5fb7 100644
--- a/absl/types/CMakeLists.txt
+++ b/absl/types/CMakeLists.txt
@@ -246,9 +246,14 @@ absl_cc_library(
     "internal/conformance_aliases.h"
     "internal/conformance_archetype.h"
     "internal/conformance_profile.h"
+    "internal/conformance_testing.h",
+    "internal/conformance_testing_helpers.h",
+    "internal/parentheses.h",
+    "internal/transform_args.h",
   COPTS
     ${ABSL_DEFAULT_COPTS}
   DEPS
+    absl::algorithm
     absl::debugging
     absl::type_traits
     absl::strings
@@ -282,6 +287,7 @@ absl_cc_test(
     ${ABSL_TEST_COPTS}
   DEPS
     absl::conformance_testing
+    absl::type_traits
     gmock_main
 )
 
diff --git a/absl/types/internal/conformance_profile.h b/absl/types/internal/conformance_profile.h
index e62004fdf271..cf64ff4fcd1e 100644
--- a/absl/types/internal/conformance_profile.h
+++ b/absl/types/internal/conformance_profile.h
@@ -36,10 +36,19 @@
 #ifndef ABSL_TYPES_INTERNAL_CONFORMANCE_PROFILE_H_
 #define ABSL_TYPES_INTERNAL_CONFORMANCE_PROFILE_H_
 
+#include <set>
 #include <type_traits>
 #include <utility>
+#include <vector>
 
+#include "gtest/gtest.h"
+#include "absl/algorithm/container.h"
 #include "absl/meta/type_traits.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+#include "absl/types/internal/conformance_testing_helpers.h"
+#include "absl/utility/utility.h"
 
 // TODO(calabrese) Add support for extending profiles.
 
@@ -47,6 +56,187 @@ namespace absl {
 ABSL_NAMESPACE_BEGIN
 namespace types_internal {
 
+// Converts an enum to its underlying integral value.
+template <typename Enum>
+constexpr absl::underlying_type_t<Enum> UnderlyingValue(Enum value) {
+  return static_cast<absl::underlying_type_t<Enum>>(value);
+}
+
+// A tag type used in place of a matcher when checking that an assertion result
+// does not actually contain any errors.
+struct NoError {};
+
+// -----------------------------------------------------------------------------
+// ConformanceErrors
+// -----------------------------------------------------------------------------
+class ConformanceErrors {
+ public:
+  // Setup the error reporting mechanism by seeding it with the name of the type
+  // that is being tested.
+  explicit ConformanceErrors(std::string type_name)
+      : assertion_result_(false), type_name_(std::move(type_name)) {
+    assertion_result_ << "\n\n"
+                         "Assuming the following type alias:\n"
+                         "\n"
+                         "  using _T = "
+                      << type_name_ << ";\n\n";
+    outputDivider();
+  }
+
+  // Adds the test name to the list of successfully run tests iff it was not
+  // previously reported as failing. This behavior is useful for tests that
+  // have multiple parts, where failures and successes are reported individually
+  // with the same test name.
+  void addTestSuccess(absl::string_view test_name) {
+    auto normalized_test_name = absl::AsciiStrToLower(test_name);
+
+    // If the test is already reported as failing, do not add it to the list of
+    // successes.
+    if (test_failures_.find(normalized_test_name) == test_failures_.end()) {
+      test_successes_.insert(std::move(normalized_test_name));
+    }
+  }
+
+  // Streams a single error description into the internal buffer (a visual
+  // divider is automatically inserted after the error so that multiple errors
+  // are visibly distinct).
+  //
+  // This function increases the error count by 1.
+  //
+  // TODO(calabrese) Determine desired behavior when if this function throws.
+  template <class... P>
+  void addTestFailure(absl::string_view test_name, const P&... args) {
+    // Output a message related to the test failure.
+    assertion_result_ << "\n\n"
+                         "Failed test: "
+                      << test_name << "\n\n";
+    addTestFailureImpl(args...);
+    assertion_result_ << "\n\n";
+    outputDivider();
+
+    auto normalized_test_name = absl::AsciiStrToLower(test_name);
+
+    // If previous parts of this test succeeded, remove it from that set.
+    test_successes_.erase(normalized_test_name);
+
+    // Add the test name to the list of failed tests.
+    test_failures_.insert(std::move(normalized_test_name));
+
+    has_error_ = true;
+  }
+
+  // Convert this object into a testing::AssertionResult instance such that it
+  // can be used with gtest.
+  ::testing::AssertionResult assertionResult() const {
+    return has_error_ ? assertion_result_ : ::testing::AssertionSuccess();
+  }
+
+  // Convert this object into a testing::AssertionResult instance such that it
+  // can be used with gtest. This overload expects errors, using the specified
+  // matcher.
+  ::testing::AssertionResult expectFailedTests(
+      const std::set<std::string>& test_names) const {
+    // Since we are expecting nonconformance, output an error message when the
+    // type actually conformed to the specified profile.
+    if (!has_error_) {
+      return ::testing::AssertionFailure()
+             << "Unexpected conformance of type:\n"
+                "    "
+             << type_name_ << "\n\n";
+    }
+
+    // Get a list of all expected failures that did not actually fail
+    // (or that were not run).
+    std::vector<std::string> nonfailing_tests;
+    absl::c_set_difference(test_names, test_failures_,
+                           std::back_inserter(nonfailing_tests));
+
+    // Get a list of all "expected failures" that were never actually run.
+    std::vector<std::string> unrun_tests;
+    absl::c_set_difference(nonfailing_tests, test_successes_,
+                           std::back_inserter(unrun_tests));
+
+    // Report when the user specified tests that were not run.
+    if (!unrun_tests.empty()) {
+      const bool tests_were_run =
+          !(test_failures_.empty() && test_successes_.empty());
+
+      // Prepare an assertion result used in the case that tests pass that were
+      // expected to fail.
+      ::testing::AssertionResult result = ::testing::AssertionFailure();
+      result << "When testing type:\n    " << type_name_
+             << "\n\nThe following tests were expected to fail but were not "
+                "run";
+
+      if (tests_were_run) result << " (was the test name spelled correctly?)";
+
+      result << ":\n\n";
+
+      // List all of the tests that unexpectedly passed.
+      for (const auto& test_name : unrun_tests) {
+        result << "    " << test_name << "\n";
+      }
+
+      if (!tests_were_run) result << "\nNo tests were run.";
+
+      if (!test_failures_.empty()) {
+        // List test failures
+        result << "\nThe tests that were run and failed are:\n\n";
+        for (const auto& test_name : test_failures_) {
+          result << "    " << test_name << "\n";
+        }
+      }
+
+      if (!test_successes_.empty()) {
+        // List test successes
+        result << "\nThe tests that were run and succeeded are:\n\n";
+        for (const auto& test_name : test_successes_) {
+          result << "    " << test_name << "\n";
+        }
+      }
+
+      return result;
+    }
+
+    // If some tests passed when they were expected to fail, alert the caller.
+    if (nonfailing_tests.empty()) return ::testing::AssertionSuccess();
+
+    // Prepare an assertion result used in the case that tests pass that were
+    // expected to fail.
+    ::testing::AssertionResult unexpected_successes =
+        ::testing::AssertionFailure();
+    unexpected_successes << "When testing type:\n    " << type_name_
+                         << "\n\nThe following tests passed when they were "
+                            "expected to fail:\n\n";
+
+    // List all of the tests that unexpectedly passed.
+    for (const auto& test_name : nonfailing_tests) {
+      unexpected_successes << "    " << test_name << "\n";
+    }
+
+    return unexpected_successes;
+  }
+
+ private:
+  void outputDivider() {
+    assertion_result_ << "========================================";
+  }
+
+  void addTestFailureImpl() {}
+
+  template <class H, class... T>
+  void addTestFailureImpl(const H& head, const T&... tail) {
+    assertion_result_ << head;
+    addTestFailureImpl(tail...);
+  }
+
+  ::testing::AssertionResult assertion_result_;
+  std::set<std::string> test_failures_;
+  std::set<std::string> test_successes_;
+  std::string type_name_;
+  bool has_error_ = false;
+};
+
 template <class T, class /*Enabler*/ = void>
 struct PropertiesOfImpl {};
 
@@ -70,31 +260,100 @@ using PropertiesOfT = typename PropertiesOf<T>::type;
 // standard trait names, which is useful since it allows us to match up each
 // enum name with a corresponding trait name in macro definitions.
 
-enum class function_kind { maybe, yes, nothrow, trivial };
+// An enum that describes the various expectations on an operations existence.
+enum class function_support { maybe, yes, nothrow, trivial };
+
+constexpr const char* PessimisticPropertyDescription(function_support v) {
+  return v == function_support::maybe
+             ? "no"
+             : v == function_support::yes
+                   ? "yes, potentially throwing"
+                   : v == function_support::nothrow ? "yes, nothrow"
+                                                    : "yes, trivial";
+}
+
+// Return a string that describes the kind of property support that was
+// expected.
+inline std::string ExpectedFunctionKindList(function_support min,
+                                            function_support max) {
+  if (min == max) {
+    std::string result =
+        absl::StrCat("Expected:\n  ",
+                     PessimisticPropertyDescription(
+                         static_cast<function_support>(UnderlyingValue(min))),
+                     "\n");
+    return result;
+  }
+
+  std::string result = "Expected one of:\n";
+  for (auto curr_support = UnderlyingValue(min);
+       curr_support <= UnderlyingValue(max); ++curr_support) {
+    absl::StrAppend(&result, "  ",
+                    PessimisticPropertyDescription(
+                        static_cast<function_support>(curr_support)),
+                    "\n");
+  }
+
+  return result;
+}
 
-#define ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM(name) \
-  enum class name { maybe, yes, nothrow, trivial }
+template <class Enum>
+void ExpectModelOfImpl(ConformanceErrors* errors, Enum min_support,
+                       Enum max_support, Enum kind) {
+  const auto kind_value = UnderlyingValue(kind);
+  const auto min_support_value = UnderlyingValue(min_support);
+  const auto max_support_value = UnderlyingValue(max_support);
+
+  if (!(kind_value >= min_support_value && kind_value <= max_support_value)) {
+    errors->addTestFailure(
+        PropertyName(kind), "**Failed property expectation**\n\n",
+        ExpectedFunctionKindList(
+            static_cast<function_support>(min_support_value),
+            static_cast<function_support>(max_support_value)),
+        '\n', "Actual:\n  ",
+        PessimisticPropertyDescription(
+            static_cast<function_support>(kind_value)));
+  } else {
+    errors->addTestSuccess(PropertyName(kind));
+  }
+}
 
-ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM(default_constructible);
-ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM(move_constructible);
-ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM(copy_constructible);
-ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM(move_assignable);
-ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM(copy_assignable);
-ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM(destructible);
+#define ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM(description, name) \
+  enum class name { maybe, yes, nothrow, trivial };                   \
+                                                                      \
+  constexpr const char* PropertyName(name v) { return description; }  \
+  static_assert(true, "")  // Force a semicolon when using this macro.
+
+ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM("support for default construction",
+                                           default_constructible);
+ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM("support for move construction",
+                                           move_constructible);
+ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM("support for copy construction",
+                                           copy_constructible);
+ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM("support for move assignment",
+                                           move_assignable);
+ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM("support for copy assignment",
+                                           copy_assignable);
+ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM("support for destruction",
+                                           destructible);
 
 #undef ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM
 
-#define ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM(name) \
-  enum class name { maybe, yes, nothrow }
+#define ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM(description, name)     \
+  enum class name { maybe, yes, nothrow };                           \
+                                                                     \
+  constexpr const char* PropertyName(name v) { return description; } \
+  static_assert(true, "")  // Force a semicolon when using this macro.
 
-ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM(equality_comparable);
-ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM(inequality_comparable);
-ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM(less_than_comparable);
-ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM(less_equal_comparable);
-ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM(greater_equal_comparable);
-ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM(greater_than_comparable);
+ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM("support for ==", equality_comparable);
+ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM("support for !=", inequality_comparable);
+ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM("support for <", less_than_comparable);
+ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM("support for <=", less_equal_comparable);
+ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM("support for >=",
+                                      greater_equal_comparable);
+ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM("support for >", greater_than_comparable);
 
-ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM(swappable);
+ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM("support for swap", swappable);
 
 #undef ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM
 
@@ -104,6 +363,184 @@ constexpr const char* PropertyName(hashable v) {
   return "support for std::hash";
 }
 
+template <class T>
+using AlwaysFalse = std::false_type;
+
+#define ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER(name, property)   \
+  template <class T>                                                        \
+  constexpr property property##_support_of() {                              \
+    return std::is_##property<T>::value                                     \
+               ? std::is_nothrow_##property<T>::value                       \
+                     ? absl::is_trivially_##property<T>::value              \
+                           ? property::trivial                              \
+                           : property::nothrow                              \
+                     : property::yes                                        \
+               : property::maybe;                                           \
+  }                                                                         \
+                                                                            \
+  template <class T, class MinProf, class MaxProf>                          \
+  void ExpectModelOf##name(ConformanceErrors* errors) {                     \
+    (ExpectModelOfImpl)(errors, PropertiesOfT<MinProf>::property##_support, \
+                        PropertiesOfT<MaxProf>::property##_support,         \
+                        property##_support_of<T>());                        \
+  }
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER(DefaultConstructible,
+                                                  default_constructible);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER(MoveConstructible,
+                                                  move_constructible);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER(CopyConstructible,
+                                                  copy_constructible);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER(MoveAssignable,
+                                                  move_assignable);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER(CopyAssignable,
+                                                  copy_assignable);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER(Destructible, destructible);
+
+#undef ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_SPECIAL_MEMBER
+
+void BoolFunction(bool) noexcept;
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A metafunction for checking if an operation exists through SFINAE.
+//
+// `T` is the type to test and Op is an alias containing the expression to test.
+template <class T, template <class...> class Op, class = void>
+struct IsOpableImpl : std::false_type {};
+
+template <class T, template <class...> class Op>
+struct IsOpableImpl<T, Op, absl::void_t<Op<T>>> : std::true_type {};
+
+template <template <class...> class Op>
+struct IsOpable {
+  template <class T>
+  using apply = typename IsOpableImpl<T, Op>::type;
+};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A metafunction for checking if an operation exists and is also noexcept
+// through SFINAE and the noexcept operator.
+///
+// `T` is the type to test and Op is an alias containing the expression to test.
+template <class T, template <class...> class Op, class = void>
+struct IsNothrowOpableImpl : std::false_type {};
+
+template <class T, template <class...> class Op>
+struct IsNothrowOpableImpl<T, Op, absl::enable_if_t<Op<T>::value>>
+    : std::true_type {};
+
+template <template <class...> class Op>
+struct IsNothrowOpable {
+  template <class T>
+  using apply = typename IsNothrowOpableImpl<T, Op>::type;
+};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A macro that produces the necessary function for reporting what kind of
+// support a specific comparison operation has and a function for reporting an
+// error if a given type's support for that operation does not meet the expected
+// requirements.
+#define ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON(name, property, op)      \
+  template <class T,                                                           \
+            class Result = std::integral_constant<                             \
+                bool, noexcept((BoolFunction)(std::declval<const T&>() op      \
+                                                  std::declval<const T&>()))>> \
+  using name = Result;                                                         \
+                                                                               \
+  template <class T>                                                           \
+  constexpr property property##_support_of() {                                 \
+    return IsOpable<name>::apply<T>::value                                     \
+               ? IsNothrowOpable<name>::apply<T>::value ? property::nothrow    \
+                                                        : property::yes        \
+               : property::maybe;                                              \
+  }                                                                            \
+                                                                               \
+  template <class T, class MinProf, class MaxProf>                             \
+  void ExpectModelOf##name(ConformanceErrors* errors) {                        \
+    (ExpectModelOfImpl)(errors, PropertiesOfT<MinProf>::property##_support,    \
+                        PropertiesOfT<MaxProf>::property##_support,            \
+                        property##_support_of<T>());                           \
+  }
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// Generate the necessary support-checking and error reporting functions for
+// each of the comparison operators.
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON(EqualityComparable,
+                                              equality_comparable, ==);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON(InequalityComparable,
+                                              inequality_comparable, !=);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON(LessThanComparable,
+                                              less_than_comparable, <);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON(LessEqualComparable,
+                                              less_equal_comparable, <=);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON(GreaterEqualComparable,
+                                              greater_equal_comparable, >=);
+
+ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON(GreaterThanComparable,
+                                              greater_than_comparable, >);
+
+#undef ABSL_INTERNAL_PESSIMISTIC_MODEL_OF_COMPARISON
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// The necessary support-checking and error-reporting functions for swap.
+template <class T>
+constexpr swappable swappable_support_of() {
+  return type_traits_internal::IsSwappable<T>::value
+             ? type_traits_internal::IsNothrowSwappable<T>::value
+                   ? swappable::nothrow
+                   : swappable::yes
+             : swappable::maybe;
+}
+
+template <class T, class MinProf, class MaxProf>
+void ExpectModelOfSwappable(ConformanceErrors* errors) {
+  (ExpectModelOfImpl)(errors, PropertiesOfT<MinProf>::swappable_support,
+                      PropertiesOfT<MaxProf>::swappable_support,
+                      swappable_support_of<T>());
+}
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// The necessary support-checking and error-reporting functions for std::hash.
+template <class T>
+constexpr hashable hashable_support_of() {
+  return type_traits_internal::IsHashable<T>::value ? hashable::yes
+                                                    : hashable::maybe;
+}
+
+template <class T, class MinProf, class MaxProf>
+void ExpectModelOfHashable(ConformanceErrors* errors) {
+  (ExpectModelOfImpl)(errors, PropertiesOfT<MinProf>::hashable_support,
+                      PropertiesOfT<MaxProf>::hashable_support,
+                      hashable_support_of<T>());
+}
+//
+////////////////////////////////////////////////////////////////////////////////
+
 template <
     default_constructible DefaultConstructibleValue =
         default_constructible::maybe,
@@ -216,6 +653,45 @@ struct ConformanceProfile {
       HashableValue != hashable::maybe;
 };
 
+////////////////////////////////////////////////////////////////////////////////
+//
+// Compliant SFINAE-friendliness is not always present on the standard library
+// implementations that we support. This helper-struct (and associated enum) is
+// used as a means to conditionally check the hashability support of a type.
+enum class CheckHashability { no, yes };
+
+template <class T, CheckHashability ShouldCheckHashability>
+struct conservative_hashable_support_of;
+
+template <class T>
+struct conservative_hashable_support_of<T, CheckHashability::no> {
+  static constexpr hashable Invoke() { return hashable::maybe; }
+};
+
+template <class T>
+struct conservative_hashable_support_of<T, CheckHashability::yes> {
+  static constexpr hashable Invoke() { return hashable_support_of<T>(); }
+};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// The ConformanceProfile that is expected based on introspection into the type
+// by way of trait checks.
+template <class T, CheckHashability ShouldCheckHashability>
+struct SyntacticConformanceProfileOf {
+  using properties = ConformanceProfile<
+      default_constructible_support_of<T>(), move_constructible_support_of<T>(),
+      copy_constructible_support_of<T>(), move_assignable_support_of<T>(),
+      copy_assignable_support_of<T>(), destructible_support_of<T>(),
+      equality_comparable_support_of<T>(),
+      inequality_comparable_support_of<T>(),
+      less_than_comparable_support_of<T>(),
+      less_equal_comparable_support_of<T>(),
+      greater_equal_comparable_support_of<T>(),
+      greater_than_comparable_support_of<T>(), swappable_support_of<T>(),
+      conservative_hashable_support_of<T, ShouldCheckHashability>::Invoke()>;
+};
+
 #define ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF_IMPL(type, name)     \
   template <default_constructible DefaultConstructibleValue,                   \
             move_constructible MoveConstructibleValue,                         \
@@ -261,12 +737,80 @@ ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(hashable);
 #undef ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF
 #undef ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF_IMPL
 
-// Converts an enum to its underlying integral value.
-template <class Enum>
-constexpr absl::underlying_type_t<Enum> UnderlyingValue(Enum value) {
-  return static_cast<absl::underlying_type_t<Enum>>(value);
+// Retrieve the enum with the minimum underlying value.
+// Note: std::min is not constexpr in C++11, which is why this is necessary.
+template <class H>
+constexpr H MinEnum(H head) {
+  return head;
 }
 
+template <class H, class N, class... T>
+constexpr H MinEnum(H head, N next, T... tail) {
+  return (UnderlyingValue)(head) < (UnderlyingValue)(next)
+             ? (MinEnum)(head, tail...)
+             : (MinEnum)(next, tail...);
+}
+
+template <class... Profs>
+struct MinimalProfiles {
+  static constexpr default_constructible
+      default_constructible_support =  // NOLINT
+      (MinEnum)(PropertiesOfT<Profs>::default_constructible_support...);
+
+  static constexpr move_constructible move_constructible_support =  // NOLINT
+      (MinEnum)(PropertiesOfT<Profs>::move_constructible_support...);
+
+  static constexpr copy_constructible copy_constructible_support =  // NOLINT
+      (MinEnum)(PropertiesOfT<Profs>::copy_constructible_support...);
+
+  static constexpr move_assignable move_assignable_support =  // NOLINT
+      (MinEnum)(PropertiesOfT<Profs>::move_assignable_support...);
+
+  static constexpr copy_assignable copy_assignable_support =  // NOLINT
+      (MinEnum)(PropertiesOfT<Profs>::copy_assignable_support...);
+
+  static constexpr destructible destructible_support =  // NOLINT
+      (MinEnum)(PropertiesOfT<Profs>::destructible_support...);
+
+  static constexpr equality_comparable equality_comparable_support =  // NOLINT
+      (MinEnum)(PropertiesOfT<Profs>::equality_comparable_support...);
+
+  static constexpr inequality_comparable
+      inequality_comparable_support =  // NOLINT
+      (MinEnum)(PropertiesOfT<Profs>::inequality_comparable_support...);
+
+  static constexpr less_than_comparable
+      less_than_comparable_support =  // NOLINT
+      (MinEnum)(PropertiesOfT<Profs>::less_than_comparable_support...);
+
+  static constexpr less_equal_comparable
+      less_equal_comparable_support =  // NOLINT
+      (MinEnum)(PropertiesOfT<Profs>::less_equal_comparable_support...);
+
+  static constexpr greater_equal_comparable
+      greater_equal_comparable_support =  // NOLINT
+      (MinEnum)(PropertiesOfT<Profs>::greater_equal_comparable_support...);
+
+  static constexpr greater_than_comparable
+      greater_than_comparable_support =  // NOLINT
+      (MinEnum)(PropertiesOfT<Profs>::greater_than_comparable_support...);
+
+  static constexpr swappable swappable_support =  // NOLINT
+      (MinEnum)(PropertiesOfT<Profs>::swappable_support...);
+
+  static constexpr hashable hashable_support =  // NOLINT
+      (MinEnum)(PropertiesOfT<Profs>::hashable_support...);
+
+  using properties = ConformanceProfile<
+      default_constructible_support, move_constructible_support,
+      copy_constructible_support, move_assignable_support,
+      copy_assignable_support, destructible_support,
+      equality_comparable_support, inequality_comparable_support,
+      less_than_comparable_support, less_equal_comparable_support,
+      greater_equal_comparable_support, greater_than_comparable_support,
+      swappable_support, hashable_support>;
+};
+
 // Retrieve the enum with the greatest underlying value.
 // Note: std::max is not constexpr in C++11, which is why this is necessary.
 template <class H>
@@ -369,6 +913,17 @@ struct IsProfileImpl<T, absl::void_t<PropertiesOfT<T>>> : std::true_type {};
 template <class T>
 struct IsProfile : IsProfileImpl<T>::type {};
 
+// A tag that describes which set of properties we will check when the user
+// requires a strict match in conformance (as opposed to a loose match which
+// allows more-refined support of any given operation).
+//
+// Currently only the RegularityDomain exists and it includes all operations
+// that the conformance testing suite knows about. The intent is that if the
+// suite is expanded to support extension, such as for checking conformance of
+// concepts like Iterators or Containers, additional corresponding domains can
+// be created.
+struct RegularityDomain {};
+
 }  // namespace types_internal
 ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/types/internal/conformance_testing.h b/absl/types/internal/conformance_testing.h
new file mode 100644
index 000000000000..487b0f786b48
--- /dev/null
+++ b/absl/types/internal/conformance_testing.h
@@ -0,0 +1,1386 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      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,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// conformance_testing.h
+// -----------------------------------------------------------------------------
+//
+
+#ifndef ABSL_TYPES_INTERNAL_CONFORMANCE_TESTING_H_
+#define ABSL_TYPES_INTERNAL_CONFORMANCE_TESTING_H_
+
+////////////////////////////////////////////////////////////////////////////////
+//                                                                            //
+// Many templates in this file take a `T` and a `Prof` type as explicit       //
+// template arguments. These are a type to be checked and a                   //
+// "Regularity Profile" that describes what operations that type `T` is       //
+// expected to support. See "regularity_profiles.h" for more details          //
+// regarding Regularity Profiles.                                             //
+//                                                                            //
+////////////////////////////////////////////////////////////////////////////////
+
+#include <cstddef>
+#include <set>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+#include "gtest/gtest.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+#include "absl/types/internal/conformance_aliases.h"
+#include "absl/types/internal/conformance_archetype.h"
+#include "absl/types/internal/conformance_profile.h"
+#include "absl/types/internal/conformance_testing_helpers.h"
+#include "absl/types/internal/parentheses.h"
+#include "absl/types/internal/transform_args.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace types_internal {
+
+// Returns true if the compiler incorrectly greedily instantiates constexpr
+// templates in any unevaluated context.
+constexpr bool constexpr_instantiation_when_unevaluated() {
+#if defined(__apple_build_version__)  // TODO(calabrese) Make more specific
+  return true;
+#elif defined(__clang__)
+  return __clang_major__ < 4;
+#elif defined(__GNUC__)
+  // TODO(calabrese) Figure out why gcc 7 fails (seems like a different bug)
+  return __GNUC__ < 5 || (__GNUC__ == 5 && __GNUC_MINOR__ < 2) || __GNUC__ >= 7;
+#else
+  return false;
+#endif
+}
+
+// Returns true if the standard library being used incorrectly produces an error
+// when instantiating the definition of a poisoned std::hash specialization.
+constexpr bool poisoned_hash_fails_instantiation() {
+#if defined(_MSC_VER) && !defined(_LIBCPP_VERSION)
+  return _MSC_VER < 1914;
+#else
+  return false;
+#endif
+}
+
+template <class Fun>
+struct GeneratorType {
+  decltype(std::declval<const Fun&>()()) operator()() const
+      noexcept(noexcept(std::declval<const Fun&>()())) {
+    return fun();
+  }
+
+  Fun fun;
+  const char* description;
+};
+
+// A "make" function for the GeneratorType template that deduces the function
+// object type.
+template <class Fun,
+          absl::enable_if_t<IsNullaryCallable<Fun>::value>** = nullptr>
+GeneratorType<Fun> Generator(Fun fun, const char* description) {
+  return GeneratorType<Fun>{absl::move(fun), description};
+}
+
+// A type that contains a set of nullary function objects that each return an
+// instance of the same type and value (though possibly different
+// representations, such as +0 and -0 or two vectors with the same elements but
+// with different capacities).
+template <class... Funs>
+struct EquivalenceClassType {
+  std::tuple<GeneratorType<Funs>...> generators;
+};
+
+// A "make" function for the EquivalenceClassType template that deduces the
+// function object types and is constrained such that a user can only pass in
+// function objects that all have the same return type.
+template <class... Funs, absl::enable_if_t<AreGeneratorsWithTheSameReturnType<
+                             Funs...>::value>** = nullptr>
+EquivalenceClassType<Funs...> EquivalenceClass(GeneratorType<Funs>... funs) {
+  return {std::make_tuple(absl::move(funs)...)};
+}
+
+// A type that contains an ordered series of EquivalenceClassTypes, from
+// smallest value to largest value.
+template <class... EqClasses>
+struct OrderedEquivalenceClasses {
+  std::tuple<EqClasses...> eq_classes;
+};
+
+// An object containing the parts of a given (name, initialization expression),
+// and is capable of generating a string that describes the given.
+struct GivenDeclaration {
+  std::string outputDeclaration(std::size_t width) const {
+    const std::size_t indent_size = 2;
+    std::string result = absl::StrCat("  ", name);
+
+    if (!expression.empty()) {
+      // Indent
+      result.resize(indent_size + width, ' ');
+      absl::StrAppend(&result, " = ", expression, ";\n");
+    } else {
+      absl::StrAppend(&result, ";\n");
+    }
+
+    return result;
+  }
+
+  std::string name;
+  std::string expression;
+};
+
+// Produce a string that contains all of the givens of an error report.
+template <class... Decls>
+std::string PrepareGivenContext(const Decls&... decls) {
+  const std::size_t width = (std::max)({decls.name.size()...});
+  return absl::StrCat("Given:\n", decls.outputDeclaration(width)..., "\n");
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Function objects that perform a check for each comparison operator         //
+////////////////////////////////////////////////////////////////////////////////
+
+#define ABSL_INTERNAL_EXPECT_OP(name, op)                                   \
+  struct Expect##name {                                                     \
+    template <class T>                                                      \
+    void operator()(absl::string_view test_name, absl::string_view context, \
+                    const T& lhs, const T& rhs, absl::string_view lhs_name, \
+                    absl::string_view rhs_name) const {                     \
+      if (!static_cast<bool>(lhs op rhs)) {                                 \
+        errors->addTestFailure(                                             \
+            test_name, absl::StrCat(context,                                \
+                                    "**Unexpected comparison result**\n"    \
+                                    "\n"                                    \
+                                    "Expression:\n"                         \
+                                    "  ",                                   \
+                                    lhs_name, " " #op " ", rhs_name,        \
+                                    "\n"                                    \
+                                    "\n"                                    \
+                                    "Expected: true\n"                      \
+                                    "  Actual: false"));                    \
+      } else {                                                              \
+        errors->addTestSuccess(test_name);                                  \
+      }                                                                     \
+    }                                                                       \
+                                                                            \
+    ConformanceErrors* errors;                                              \
+  };                                                                        \
+                                                                            \
+  struct ExpectNot##name {                                                  \
+    template <class T>                                                      \
+    void operator()(absl::string_view test_name, absl::string_view context, \
+                    const T& lhs, const T& rhs, absl::string_view lhs_name, \
+                    absl::string_view rhs_name) const {                     \
+      if (lhs op rhs) {                                                     \
+        errors->addTestFailure(                                             \
+            test_name, absl::StrCat(context,                                \
+                                    "**Unexpected comparison result**\n"    \
+                                    "\n"                                    \
+                                    "Expression:\n"                         \
+                                    "  ",                                   \
+                                    lhs_name, " " #op " ", rhs_name,        \
+                                    "\n"                                    \
+                                    "\n"                                    \
+                                    "Expected: false\n"                     \
+                                    "  Actual: true"));                     \
+      } else {                                                              \
+        errors->addTestSuccess(test_name);                                  \
+      }                                                                     \
+    }                                                                       \
+                                                                            \
+    ConformanceErrors* errors;                                              \
+  }
+
+ABSL_INTERNAL_EXPECT_OP(Eq, ==);
+ABSL_INTERNAL_EXPECT_OP(Ne, !=);
+ABSL_INTERNAL_EXPECT_OP(Lt, <);
+ABSL_INTERNAL_EXPECT_OP(Le, <=);
+ABSL_INTERNAL_EXPECT_OP(Ge, >=);
+ABSL_INTERNAL_EXPECT_OP(Gt, >);
+
+#undef ABSL_INTERNAL_EXPECT_OP
+
+// A function object that verifies that two objects hash to the same value by
+// way of the std::hash specialization.
+struct ExpectSameHash {
+  template <class T>
+  void operator()(absl::string_view test_name, absl::string_view context,
+                  const T& lhs, const T& rhs, absl::string_view lhs_name,
+                  absl::string_view rhs_name) const {
+    if (std::hash<T>()(lhs) != std::hash<T>()(rhs)) {
+      errors->addTestFailure(
+          test_name, absl::StrCat(context,
+                                  "**Unexpected hash result**\n"
+                                  "\n"
+                                  "Expression:\n"
+                                  "  std::hash<T>()(",
+                                  lhs_name, ") == std::hash<T>()(", rhs_name,
+                                  ")\n"
+                                  "\n"
+                                  "Expected: true\n"
+                                  "  Actual: false"));
+    } else {
+      errors->addTestSuccess(test_name);
+    }
+  }
+
+  ConformanceErrors* errors;
+};
+
+// A function template that takes two objects and verifies that each comparison
+// operator behaves in a way that is consistent with equality. It has "OneWay"
+// in the name because the first argument will always be the left-hand operand
+// of the corresponding comparison operator and the second argument will
+// always be the right-hand operand. It will never switch that order.
+// At a higher level in the test suite, the one-way form is called once for each
+// of the two possible orders whenever lhs and rhs are not the same initializer.
+template <class T, class Prof>
+void ExpectOneWayEquality(ConformanceErrors* errors,
+                          absl::string_view test_name,
+                          absl::string_view context, const T& lhs, const T& rhs,
+                          absl::string_view lhs_name,
+                          absl::string_view rhs_name) {
+  If<PropertiesOfT<Prof>::is_equality_comparable>::Invoke(
+      ExpectEq{errors}, test_name, context, lhs, rhs, lhs_name, rhs_name);
+
+  If<PropertiesOfT<Prof>::is_inequality_comparable>::Invoke(
+      ExpectNotNe{errors}, test_name, context, lhs, rhs, lhs_name, rhs_name);
+
+  If<PropertiesOfT<Prof>::is_less_than_comparable>::Invoke(
+      ExpectNotLt{errors}, test_name, context, lhs, rhs, lhs_name, rhs_name);
+
+  If<PropertiesOfT<Prof>::is_less_equal_comparable>::Invoke(
+      ExpectLe{errors}, test_name, context, lhs, rhs, lhs_name, rhs_name);
+
+  If<PropertiesOfT<Prof>::is_greater_equal_comparable>::Invoke(
+      ExpectGe{errors}, test_name, context, lhs, rhs, lhs_name, rhs_name);
+
+  If<PropertiesOfT<Prof>::is_greater_than_comparable>::Invoke(
+      ExpectNotGt{errors}, test_name, context, lhs, rhs, lhs_name, rhs_name);
+
+  If<PropertiesOfT<Prof>::is_hashable>::Invoke(
+      ExpectSameHash{errors}, test_name, context, lhs, rhs, lhs_name, rhs_name);
+}
+
+// A function template that takes two objects and verifies that each comparison
+// operator behaves in a way that is consistent with equality. This function
+// differs from ExpectOneWayEquality in that this will do checks with argument
+// order reversed in addition to in-order.
+template <class T, class Prof>
+void ExpectEquality(ConformanceErrors* errors, absl::string_view test_name,
+                    absl::string_view context, const T& lhs, const T& rhs,
+                    absl::string_view lhs_name, absl::string_view rhs_name) {
+  (ExpectOneWayEquality<T, Prof>)(errors, test_name, context, lhs, rhs,
+                                  lhs_name, rhs_name);
+  (ExpectOneWayEquality<T, Prof>)(errors, test_name, context, rhs, lhs,
+                                  rhs_name, lhs_name);
+}
+
+// Given a generator, makes sure that a generated value and a moved-from
+// generated value are equal.
+template <class T, class Prof>
+struct ExpectMoveConstructOneGenerator {
+  template <class Fun>
+  void operator()(const Fun& generator) const {
+    const T object = generator();
+    const T moved_object = absl::move(generator());  // Force no elision.
+
+    (ExpectEquality<T, Prof>)(errors, "Move construction",
+                              PrepareGivenContext(
+                                  GivenDeclaration{"const _T object",
+                                                   generator.description},
+                                  GivenDeclaration{"const _T moved_object",
+                                                   std::string("std::move(") +
+                                                       generator.description +
+                                                       ")"}),
+                              object, moved_object, "object", "moved_object");
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Given a generator, makes sure that a generated value and a copied-from
+// generated value are equal.
+template <class T, class Prof>
+struct ExpectCopyConstructOneGenerator {
+  template <class Fun>
+  void operator()(const Fun& generator) const {
+    const T object = generator();
+    const T copied_object = static_cast<const T&>(generator());
+
+    (ExpectEquality<T, Prof>)(errors, "Copy construction",
+                              PrepareGivenContext(
+                                  GivenDeclaration{"const _T object",
+                                                   generator.description},
+                                  GivenDeclaration{
+                                      "const _T copied_object",
+                                      std::string("static_cast<const _T&>(") +
+                                          generator.description + ")"}),
+                              object, copied_object, "object", "copied_object");
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Default-construct and do nothing before destruction.
+//
+// This is useful in exercising the codepath of default construction followed by
+// destruction, but does not explicitly test anything. An example of where this
+// might fail is a default destructor that default-initializes a scalar and a
+// destructor reads the value of that member. Sanitizers can catch this as long
+// as our test attempts to execute such a case.
+template <class T>
+struct ExpectDefaultConstructWithDestruct {
+  void operator()() const {
+    // Scoped so that destructor gets called before reporting success.
+    {
+      T object;
+      static_cast<void>(object);
+    }
+
+    errors->addTestSuccess("Default construction");
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Check move-assign into a default-constructed object.
+template <class T, class Prof>
+struct ExpectDefaultConstructWithMoveAssign {
+  template <class Fun>
+  void operator()(const Fun& generator) const {
+    const T source_of_truth = generator();
+    T object;
+    object = generator();
+
+    (ExpectEquality<T, Prof>)(errors, "Move assignment",
+                              PrepareGivenContext(
+                                  GivenDeclaration{"const _T object",
+                                                   generator.description},
+                                  GivenDeclaration{"_T object", ""},
+                                  GivenDeclaration{"object",
+                                                   generator.description}),
+                              object, source_of_truth, "std::as_const(object)",
+                              "source_of_truth");
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Check copy-assign into a default-constructed object.
+template <class T, class Prof>
+struct ExpectDefaultConstructWithCopyAssign {
+  template <class Fun>
+  void operator()(const Fun& generator) const {
+    const T source_of_truth = generator();
+    T object;
+    object = static_cast<const T&>(generator());
+
+    (ExpectEquality<T, Prof>)(errors, "Copy assignment",
+                              PrepareGivenContext(
+                                  GivenDeclaration{"const _T source_of_truth",
+                                                   generator.description},
+                                  GivenDeclaration{"_T object", ""},
+                                  GivenDeclaration{
+                                      "object",
+                                      std::string("static_cast<const _T&>(") +
+                                          generator.description + ")"}),
+                              object, source_of_truth, "std::as_const(object)",
+                              "source_of_truth");
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Perform a self move-assign.
+template <class T, class Prof>
+struct ExpectSelfMoveAssign {
+  template <class Fun>
+  void operator()(const Fun& generator) const {
+    T object = generator();
+    object = absl::move(object);
+
+    // NOTE: Self move-assign results in a valid-but-unspecified state.
+
+    (ExpectEquality<T, Prof>)(errors, "Move assignment",
+                              PrepareGivenContext(
+                                  GivenDeclaration{"_T object",
+                                                   generator.description},
+                                  GivenDeclaration{"object",
+                                                   "std::move(object)"}),
+                              object, object, "object", "object");
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Perform a self copy-assign.
+template <class T, class Prof>
+struct ExpectSelfCopyAssign {
+  template <class Fun>
+  void operator()(const Fun& generator) const {
+    const T source_of_truth = generator();
+    T object = generator();
+    const T& const_object = object;
+    object = const_object;
+
+    (ExpectEquality<T, Prof>)(errors, "Copy assignment",
+                              PrepareGivenContext(
+                                  GivenDeclaration{"const _T source_of_truth",
+                                                   generator.description},
+                                  GivenDeclaration{"_T object",
+                                                   generator.description},
+                                  GivenDeclaration{"object",
+                                                   "std::as_const(object)"}),
+                              const_object, source_of_truth,
+                              "std::as_const(object)", "source_of_truth");
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Perform a self-swap.
+template <class T, class Prof>
+struct ExpectSelfSwap {
+  template <class Fun>
+  void operator()(const Fun& generator) const {
+    const T source_of_truth = generator();
+    T object = generator();
+
+    type_traits_internal::Swap(object, object);
+
+    std::string preliminary_info = absl::StrCat(
+        PrepareGivenContext(
+            GivenDeclaration{"const _T source_of_truth", generator.description},
+            GivenDeclaration{"_T object", generator.description}),
+        "After performing a self-swap:\n"
+        "  using std::swap;\n"
+        "  swap(object, object);\n"
+        "\n");
+
+    (ExpectEquality<T, Prof>)(errors, "Swap", std::move(preliminary_info),
+                              object, source_of_truth, "std::as_const(object)",
+                              "source_of_truth");
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Perform each of the single-generator checks when necessary operations are
+// supported.
+template <class T, class Prof>
+struct ExpectSelfComparison {
+  template <class Fun>
+  void operator()(const Fun& generator) const {
+    const T object = generator();
+    (ExpectOneWayEquality<T, Prof>)(errors, "Comparison",
+                                    PrepareGivenContext(GivenDeclaration{
+                                        "const _T object",
+                                        generator.description}),
+                                    object, object, "object", "object");
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Perform each of the single-generator checks when necessary operations are
+// supported.
+template <class T, class Prof>
+struct ExpectConsistency {
+  template <class Fun>
+  void operator()(const Fun& generator) const {
+    If<PropertiesOfT<Prof>::is_move_constructible>::Invoke(
+        ExpectMoveConstructOneGenerator<T, Prof>{errors}, generator);
+
+    If<PropertiesOfT<Prof>::is_copy_constructible>::Invoke(
+        ExpectCopyConstructOneGenerator<T, Prof>{errors}, generator);
+
+    If<PropertiesOfT<Prof>::is_default_constructible &&
+       PropertiesOfT<Prof>::is_move_assignable>::
+        Invoke(ExpectDefaultConstructWithMoveAssign<T, Prof>{errors},
+               generator);
+
+    If<PropertiesOfT<Prof>::is_default_constructible &&
+       PropertiesOfT<Prof>::is_copy_assignable>::
+        Invoke(ExpectDefaultConstructWithCopyAssign<T, Prof>{errors},
+               generator);
+
+    If<PropertiesOfT<Prof>::is_move_assignable>::Invoke(
+        ExpectSelfMoveAssign<T, Prof>{errors}, generator);
+
+    If<PropertiesOfT<Prof>::is_copy_assignable>::Invoke(
+        ExpectSelfCopyAssign<T, Prof>{errors}, generator);
+
+    If<PropertiesOfT<Prof>::is_swappable>::Invoke(
+        ExpectSelfSwap<T, Prof>{errors}, generator);
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Check move-assign with two different values.
+template <class T, class Prof>
+struct ExpectMoveAssign {
+  template <class Fun0, class Fun1>
+  void operator()(const Fun0& generator0, const Fun1& generator1) const {
+    const T source_of_truth1 = generator1();
+    T object = generator0();
+    object = generator1();
+
+    (ExpectEquality<T, Prof>)(errors, "Move assignment",
+                              PrepareGivenContext(
+                                  GivenDeclaration{"const _T source_of_truth1",
+                                                   generator1.description},
+                                  GivenDeclaration{"_T object",
+                                                   generator0.description},
+                                  GivenDeclaration{"object",
+                                                   generator1.description}),
+                              object, source_of_truth1, "std::as_const(object)",
+                              "source_of_truth1");
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Check copy-assign with two different values.
+template <class T, class Prof>
+struct ExpectCopyAssign {
+  template <class Fun0, class Fun1>
+  void operator()(const Fun0& generator0, const Fun1& generator1) const {
+    const T source_of_truth1 = generator1();
+    T object = generator0();
+    object = static_cast<const T&>(generator1());
+
+    (ExpectEquality<T, Prof>)(errors, "Copy assignment",
+                              PrepareGivenContext(
+                                  GivenDeclaration{"const _T source_of_truth1",
+                                                   generator1.description},
+                                  GivenDeclaration{"_T object",
+                                                   generator0.description},
+                                  GivenDeclaration{
+                                      "object",
+                                      std::string("static_cast<const _T&>(") +
+                                          generator1.description + ")"}),
+                              object, source_of_truth1, "std::as_const(object)",
+                              "source_of_truth1");
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Check swap with two different values.
+template <class T, class Prof>
+struct ExpectSwap {
+  template <class Fun0, class Fun1>
+  void operator()(const Fun0& generator0, const Fun1& generator1) const {
+    const T source_of_truth0 = generator0();
+    const T source_of_truth1 = generator1();
+    T object0 = generator0();
+    T object1 = generator1();
+
+    type_traits_internal::Swap(object0, object1);
+
+    const std::string context =
+        PrepareGivenContext(
+            GivenDeclaration{"const _T source_of_truth0",
+                             generator0.description},
+            GivenDeclaration{"const _T source_of_truth1",
+                             generator1.description},
+            GivenDeclaration{"_T object0", generator0.description},
+            GivenDeclaration{"_T object1", generator1.description}) +
+        "After performing a swap:\n"
+        "  using std::swap;\n"
+        "  swap(object0, object1);\n"
+        "\n";
+
+    (ExpectEquality<T, Prof>)(errors, "Swap", context, object0,
+                              source_of_truth1, "std::as_const(object0)",
+                              "source_of_truth1");
+    (ExpectEquality<T, Prof>)(errors, "Swap", context, object1,
+                              source_of_truth0, "std::as_const(object1)",
+                              "source_of_truth0");
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Validate that `generator0` and `generator1` produce values that are equal.
+template <class T, class Prof>
+struct ExpectEquivalenceClassComparison {
+  template <class Fun0, class Fun1>
+  void operator()(const Fun0& generator0, const Fun1& generator1) const {
+    const T object0 = generator0();
+    const T object1 = generator1();
+
+    (ExpectEquality<T, Prof>)(errors, "Comparison",
+                              PrepareGivenContext(
+                                  GivenDeclaration{"const _T object0",
+                                                   generator0.description},
+                                  GivenDeclaration{"const _T object1",
+                                                   generator1.description}),
+                              object0, object1, "object0", "object1");
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Validate that all objects in the same equivalence-class have the same value.
+template <class T, class Prof>
+struct ExpectEquivalenceClassConsistency {
+  template <class Fun0, class Fun1>
+  void operator()(const Fun0& generator0, const Fun1& generator1) const {
+    If<PropertiesOfT<Prof>::is_move_assignable>::Invoke(
+        ExpectMoveAssign<T, Prof>{errors}, generator0, generator1);
+
+    If<PropertiesOfT<Prof>::is_copy_assignable>::Invoke(
+        ExpectCopyAssign<T, Prof>{errors}, generator0, generator1);
+
+    If<PropertiesOfT<Prof>::is_swappable>::Invoke(ExpectSwap<T, Prof>{errors},
+                                                  generator0, generator1);
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Given a "lesser" object and a "greater" object, perform every combination of
+// comparison operators supported for the type, expecting consistent results.
+template <class T, class Prof>
+void ExpectOrdered(ConformanceErrors* errors, absl::string_view context,
+                   const T& small, const T& big, absl::string_view small_name,
+                   absl::string_view big_name) {
+  const absl::string_view test_name = "Comparison";
+
+  If<PropertiesOfT<Prof>::is_equality_comparable>::Invoke(
+      ExpectNotEq{errors}, test_name, context, small, big, small_name,
+      big_name);
+  If<PropertiesOfT<Prof>::is_equality_comparable>::Invoke(
+      ExpectNotEq{errors}, test_name, context, big, small, big_name,
+      small_name);
+
+  If<PropertiesOfT<Prof>::is_inequality_comparable>::Invoke(
+      ExpectNe{errors}, test_name, context, small, big, small_name, big_name);
+  If<PropertiesOfT<Prof>::is_inequality_comparable>::Invoke(
+      ExpectNe{errors}, test_name, context, big, small, big_name, small_name);
+
+  If<PropertiesOfT<Prof>::is_less_than_comparable>::Invoke(
+      ExpectLt{errors}, test_name, context, small, big, small_name, big_name);
+  If<PropertiesOfT<Prof>::is_less_than_comparable>::Invoke(
+      ExpectNotLt{errors}, test_name, context, big, small, big_name,
+      small_name);
+
+  If<PropertiesOfT<Prof>::is_less_equal_comparable>::Invoke(
+      ExpectLe{errors}, test_name, context, small, big, small_name, big_name);
+  If<PropertiesOfT<Prof>::is_less_equal_comparable>::Invoke(
+      ExpectNotLe{errors}, test_name, context, big, small, big_name,
+      small_name);
+
+  If<PropertiesOfT<Prof>::is_greater_equal_comparable>::Invoke(
+      ExpectNotGe{errors}, test_name, context, small, big, small_name,
+      big_name);
+  If<PropertiesOfT<Prof>::is_greater_equal_comparable>::Invoke(
+      ExpectGe{errors}, test_name, context, big, small, big_name, small_name);
+
+  If<PropertiesOfT<Prof>::is_greater_than_comparable>::Invoke(
+      ExpectNotGt{errors}, test_name, context, small, big, small_name,
+      big_name);
+  If<PropertiesOfT<Prof>::is_greater_than_comparable>::Invoke(
+      ExpectGt{errors}, test_name, context, big, small, big_name, small_name);
+}
+
+// For every two elements of an equivalence class, makes sure that those two
+// elements compare equal, including checks with the same argument passed as
+// both operands.
+template <class T, class Prof>
+struct ExpectEquivalenceClassComparisons {
+  template <class... Funs>
+  void operator()(EquivalenceClassType<Funs...> eq_class) const {
+    (ForEachTupleElement)(ExpectSelfComparison<T, Prof>{errors},
+                          eq_class.generators);
+
+    (ForEveryTwo)(ExpectEquivalenceClassComparison<T, Prof>{errors},
+                  eq_class.generators);
+  }
+
+  ConformanceErrors* errors;
+};
+
+// For every element of an equivalence class, makes sure that the element is
+// self-consistent (in other words, if any of move/copy/swap are defined,
+// perform those operations and make such that results and operands still
+// compare equal to known values whenever it is required for that operation.
+template <class T, class Prof>
+struct ExpectEquivalenceClass {
+  template <class... Funs>
+  void operator()(EquivalenceClassType<Funs...> eq_class) const {
+    (ForEachTupleElement)(ExpectConsistency<T, Prof>{errors},
+                          eq_class.generators);
+
+    (ForEveryTwo)(ExpectEquivalenceClassConsistency<T, Prof>{errors},
+                  eq_class.generators);
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Validate that the passed-in argument is a generator of a greater value than
+// the one produced by the "small_gen" datamember with respect to all of the
+// comparison operators that Prof requires, with both argument orders to test.
+template <class T, class Prof, class SmallGenerator>
+struct ExpectBiggerGeneratorThanComparisons {
+  template <class BigGenerator>
+  void operator()(BigGenerator big_gen) const {
+    const T small = small_gen();
+    const T big = big_gen();
+
+    (ExpectOrdered<T, Prof>)(errors,
+                             PrepareGivenContext(
+                                 GivenDeclaration{"const _T small",
+                                                  small_gen.description},
+                                 GivenDeclaration{"const _T big",
+                                                  big_gen.description}),
+                             small, big, "small", "big");
+  }
+
+  SmallGenerator small_gen;
+  ConformanceErrors* errors;
+};
+
+// Perform all of the move, copy, and swap checks on the value generated by
+// `small_gen` and the value generated by `big_gen`.
+template <class T, class Prof, class SmallGenerator>
+struct ExpectBiggerGeneratorThan {
+  template <class BigGenerator>
+  void operator()(BigGenerator big_gen) const {
+    If<PropertiesOfT<Prof>::is_move_assignable>::Invoke(
+        ExpectMoveAssign<T, Prof>{errors}, small_gen, big_gen);
+    If<PropertiesOfT<Prof>::is_move_assignable>::Invoke(
+        ExpectMoveAssign<T, Prof>{errors}, big_gen, small_gen);
+
+    If<PropertiesOfT<Prof>::is_copy_assignable>::Invoke(
+        ExpectCopyAssign<T, Prof>{errors}, small_gen, big_gen);
+    If<PropertiesOfT<Prof>::is_copy_assignable>::Invoke(
+        ExpectCopyAssign<T, Prof>{errors}, big_gen, small_gen);
+
+    If<PropertiesOfT<Prof>::is_swappable>::Invoke(ExpectSwap<T, Prof>{errors},
+                                                  small_gen, big_gen);
+  }
+
+  SmallGenerator small_gen;
+  ConformanceErrors* errors;
+};
+
+// Validate that the result of a generator is greater than the results of all
+// generators in an equivalence class with respect to comparisons.
+template <class T, class Prof, class SmallGenerator>
+struct ExpectBiggerGeneratorThanEqClassesComparisons {
+  template <class BigEqClass>
+  void operator()(BigEqClass big_eq_class) const {
+    (ForEachTupleElement)(
+        ExpectBiggerGeneratorThanComparisons<T, Prof, SmallGenerator>{small_gen,
+                                                                      errors},
+        big_eq_class.generators);
+  }
+
+  SmallGenerator small_gen;
+  ConformanceErrors* errors;
+};
+
+// Validate that the non-comparison binary operations required by Prof are
+// correct for the result of each generator of big_eq_class and a generator of
+// the logically smaller value returned by small_gen.
+template <class T, class Prof, class SmallGenerator>
+struct ExpectBiggerGeneratorThanEqClasses {
+  template <class BigEqClass>
+  void operator()(BigEqClass big_eq_class) const {
+    (ForEachTupleElement)(
+        ExpectBiggerGeneratorThan<T, Prof, SmallGenerator>{small_gen, errors},
+        big_eq_class.generators);
+  }
+
+  SmallGenerator small_gen;
+  ConformanceErrors* errors;
+};
+
+// Validate that each equivalence class that is passed is logically less than
+// the equivalence classes that comes later on in the argument list.
+template <class T, class Prof>
+struct ExpectOrderedEquivalenceClassesComparisons {
+  template <class... BigEqClasses>
+  struct Impl {
+    // Validate that the value produced by `small_gen` is less than all of the
+    // values generated by those of the logically larger equivalence classes.
+    template <class SmallGenerator>
+    void operator()(SmallGenerator small_gen) const {
+      (ForEachTupleElement)(ExpectBiggerGeneratorThanEqClassesComparisons<
+                                T, Prof, SmallGenerator>{small_gen, errors},
+                            big_eq_classes);
+    }
+
+    std::tuple<BigEqClasses...> big_eq_classes;
+    ConformanceErrors* errors;
+  };
+
+  // When given no equivalence classes, no validation is necessary.
+  void operator()() const {}
+
+  template <class SmallEqClass, class... BigEqClasses>
+  void operator()(SmallEqClass small_eq_class,
+                  BigEqClasses... big_eq_classes) const {
+    // For each generator in the first equivalence class, make sure that it is
+    // less than each of those in the logically greater equivalence classes.
+    (ForEachTupleElement)(
+        Impl<BigEqClasses...>{std::make_tuple(absl::move(big_eq_classes)...),
+                              errors},
+        small_eq_class.generators);
+
+    // Recurse so that all equivalence class combinations are checked.
+    (*this)(absl::move(big_eq_classes)...);
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Validate that the non-comparison binary operations required by Prof are
+// correct for the result of each generator of big_eq_classes and a generator of
+// the logically smaller value returned by small_gen.
+template <class T, class Prof>
+struct ExpectOrderedEquivalenceClasses {
+  template <class... BigEqClasses>
+  struct Impl {
+    template <class SmallGenerator>
+    void operator()(SmallGenerator small_gen) const {
+      (ForEachTupleElement)(
+          ExpectBiggerGeneratorThanEqClasses<T, Prof, SmallGenerator>{small_gen,
+                                                                      errors},
+          big_eq_classes);
+    }
+
+    std::tuple<BigEqClasses...> big_eq_classes;
+    ConformanceErrors* errors;
+  };
+
+  // Check that small_eq_class is logically consistent and also is logically
+  // less than all values in big_eq_classes.
+  template <class SmallEqClass, class... BigEqClasses>
+  void operator()(SmallEqClass small_eq_class,
+                  BigEqClasses... big_eq_classes) const {
+    (ForEachTupleElement)(
+        Impl<BigEqClasses...>{std::make_tuple(absl::move(big_eq_classes)...),
+                              errors},
+        small_eq_class.generators);
+
+    (*this)(absl::move(big_eq_classes)...);
+  }
+
+  // Terminating case of operator().
+  void operator()() const {}
+
+  ConformanceErrors* errors;
+};
+
+// Validate that a type meets the syntactic requirements of std::hash if the
+// range of profiles requires it.
+template <class T, class MinProf, class MaxProf>
+struct ExpectHashable {
+  void operator()() const {
+    ExpectModelOfHashable<T, MinProf, MaxProf>(errors);
+  }
+
+  ConformanceErrors* errors;
+};
+
+// Validate that the type `T` meets all of the requirements associated with
+// `MinProf` and without going beyond the syntactic properties of `MaxProf`.
+template <class T, class MinProf, class MaxProf>
+struct ExpectModels {
+  void operator()(ConformanceErrors* errors) const {
+    ExpectModelOfDefaultConstructible<T, MinProf, MaxProf>(errors);
+    ExpectModelOfMoveConstructible<T, MinProf, MaxProf>(errors);
+    ExpectModelOfCopyConstructible<T, MinProf, MaxProf>(errors);
+    ExpectModelOfMoveAssignable<T, MinProf, MaxProf>(errors);
+    ExpectModelOfCopyAssignable<T, MinProf, MaxProf>(errors);
+    ExpectModelOfDestructible<T, MinProf, MaxProf>(errors);
+    ExpectModelOfEqualityComparable<T, MinProf, MaxProf>(errors);
+    ExpectModelOfInequalityComparable<T, MinProf, MaxProf>(errors);
+    ExpectModelOfLessThanComparable<T, MinProf, MaxProf>(errors);
+    ExpectModelOfLessEqualComparable<T, MinProf, MaxProf>(errors);
+    ExpectModelOfGreaterEqualComparable<T, MinProf, MaxProf>(errors);
+    ExpectModelOfGreaterThanComparable<T, MinProf, MaxProf>(errors);
+    ExpectModelOfSwappable<T, MinProf, MaxProf>(errors);
+
+    // Only check hashability on compilers that have a compliant default-hash.
+    If<!poisoned_hash_fails_instantiation()>::Invoke(
+        ExpectHashable<T, MinProf, MaxProf>{errors});
+  }
+};
+
+// A metafunction that yields a Profile matching the set of properties that are
+// safe to be checked (lack-of-hashability is only checked on standard library
+// implementations that are standards compliant in that they provide a std::hash
+// primary template that is SFINAE-friendly)
+template <class LogicalProf, class T>
+struct MinimalCheckableProfile {
+  using type =
+      MinimalProfiles<PropertiesOfT<LogicalProf>,
+                      PropertiesOfT<SyntacticConformanceProfileOf<
+                          T, !PropertiesOfT<LogicalProf>::is_hashable &&
+                                     poisoned_hash_fails_instantiation()
+                                 ? CheckHashability::no
+                                 : CheckHashability::yes>>>;
+};
+
+// An identity metafunction
+template <class T>
+struct Always {
+  using type = T;
+};
+
+// Validate the T meets all of the necessary requirements of LogicalProf, with
+// syntactic requirements defined by the profile range [MinProf, MaxProf].
+template <class T, class LogicalProf, class MinProf, class MaxProf,
+          class... EqClasses>
+ConformanceErrors ExpectRegularityImpl(
+    OrderedEquivalenceClasses<EqClasses...> vals) {
+  ConformanceErrors errors((NameOf<T>()));
+
+  If<!constexpr_instantiation_when_unevaluated()>::Invoke(
+      ExpectModels<T, MinProf, MaxProf>(), &errors);
+
+  using minimal_profile = typename absl::conditional_t<
+      constexpr_instantiation_when_unevaluated(), Always<LogicalProf>,
+      MinimalCheckableProfile<LogicalProf, T>>::type;
+
+  If<PropertiesOfT<minimal_profile>::is_default_constructible>::Invoke(
+      ExpectDefaultConstructWithDestruct<T>{&errors});
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Perform all comparison checks first, since later checks depend on their
+  // correctness.
+  //
+  // Check all of the comparisons for all values in the same equivalence
+  // class (equal with respect to comparison operators and hash the same).
+  (ForEachTupleElement)(
+      ExpectEquivalenceClassComparisons<T, minimal_profile>{&errors},
+      vals.eq_classes);
+
+  // Check all of the comparisons for each combination of values that are in
+  // different equivalence classes (not equal with respect to comparison
+  // operators).
+  absl::apply(
+      ExpectOrderedEquivalenceClassesComparisons<T, minimal_profile>{&errors},
+      vals.eq_classes);
+  //
+  //////////////////////////////////////////////////////////////////////////////
+
+  // Perform remaining checks, relying on comparisons.
+  // TODO(calabrese) short circuit if any comparisons above failed.
+  (ForEachTupleElement)(ExpectEquivalenceClass<T, minimal_profile>{&errors},
+                        vals.eq_classes);
+
+  absl::apply(ExpectOrderedEquivalenceClasses<T, minimal_profile>{&errors},
+              vals.eq_classes);
+
+  return errors;
+}
+
+// A type that represents a range of profiles that are acceptable to be matched.
+//
+// `MinProf` is the minimum set of syntactic requirements that must be met.
+//
+// `MaxProf` is the maximum set of syntactic requirements that must be met.
+// This maximum is particularly useful for certain "strictness" checking. Some
+// examples for when this is useful:
+//
+// * Making sure that a type is move-only (rather than simply movable)
+//
+// * Making sure that a member function is *not* noexcept in cases where it
+//   cannot be noexcept, such as if a dependent datamember has certain
+//   operations that are not noexcept.
+//
+// * Making sure that a type tightly matches a spec, such as the standard.
+//
+// `LogicalProf` is the Profile for which run-time testing is to take place.
+//
+// Note: The reason for `LogicalProf` is because it is often the case, when
+// dealing with templates, that a declaration of a given operation is specified,
+// but whose body would fail to instantiate. Examples include the
+// copy-constructor of a standard container when the element-type is move-only,
+// or the comparison operators of a standard container when the element-type
+// does not have the necessary comparison operations defined. The `LogicalProf`
+// parameter allows us to capture the intent of what should be tested at
+// run-time, even in the cases where syntactically it might otherwise appear as
+// though the type undergoing testing supports more than it actually does.
+template <class LogicalProf, class MinProf = LogicalProf,
+          class MaxProf = MinProf>
+struct ProfileRange {
+  using logical_profile = LogicalProf;
+  using min_profile = MinProf;
+  using max_profile = MaxProf;
+};
+
+// Similar to ProfileRange except that it creates a profile range that is
+// coupled with a Domain and is used when testing that a type matches exactly
+// the "minimum" requirements of LogicalProf.
+template <class StrictnessDomain, class LogicalProf,
+          class MinProf = LogicalProf, class MaxProf = MinProf>
+struct StrictProfileRange {
+  // We do not yet support extension.
+  static_assert(
+      std::is_same<StrictnessDomain, RegularityDomain>::value,
+      "Currently, the only valid StrictnessDomain is RegularityDomain.");
+  using strictness_domain = StrictnessDomain;
+  using logical_profile = LogicalProf;
+  using min_profile = MinProf;
+  using max_profile = MaxProf;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A metafunction that creates a StrictProfileRange from a Domain and either a
+// Profile or ProfileRange.
+template <class StrictnessDomain, class ProfOrRange>
+struct MakeStrictProfileRange;
+
+template <class StrictnessDomain, class LogicalProf>
+struct MakeStrictProfileRange {
+  using type = StrictProfileRange<StrictnessDomain, LogicalProf>;
+};
+
+template <class StrictnessDomain, class LogicalProf, class MinProf,
+          class MaxProf>
+struct MakeStrictProfileRange<StrictnessDomain,
+                              ProfileRange<LogicalProf, MinProf, MaxProf>> {
+  using type =
+      StrictProfileRange<StrictnessDomain, LogicalProf, MinProf, MaxProf>;
+};
+
+template <class StrictnessDomain, class ProfOrRange>
+using MakeStrictProfileRangeT =
+    typename MakeStrictProfileRange<StrictnessDomain, ProfOrRange>::type;
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// A profile in the RegularityDomain with the strongest possible requirements.
+using MostStrictProfile =
+    CombineProfiles<TriviallyCompleteProfile, NothrowComparableProfile>;
+
+// Forms a ProfileRange that treats the Profile as the bare minimum requirements
+// of a type.
+template <class LogicalProf, class MinProf = LogicalProf>
+using LooseProfileRange = StrictProfileRange<RegularityDomain, LogicalProf,
+                                             MinProf, MostStrictProfile>;
+
+template <class Prof>
+using MakeLooseProfileRangeT = Prof;
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// The following classes implement the metafunction ProfileRangeOfT<T> that
+// takes either a Profile or ProfileRange and yields the ProfileRange to be
+// used during testing.
+//
+template <class T, class /*Enabler*/ = void>
+struct ProfileRangeOfImpl;
+
+template <class T>
+struct ProfileRangeOfImpl<T, absl::void_t<PropertiesOfT<T>>> {
+  using type = LooseProfileRange<T>;
+};
+
+template <class T>
+struct ProfileRangeOf : ProfileRangeOfImpl<T> {};
+
+template <class StrictnessDomain, class LogicalProf, class MinProf,
+          class MaxProf>
+struct ProfileRangeOf<
+    StrictProfileRange<StrictnessDomain, LogicalProf, MinProf, MaxProf>> {
+  using type =
+      StrictProfileRange<StrictnessDomain, LogicalProf, MinProf, MaxProf>;
+};
+
+template <class T>
+using ProfileRangeOfT = typename ProfileRangeOf<T>::type;
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// Extract the logical profile of a range (what will be runtime tested).
+template <class T>
+using LogicalProfileOfT = typename ProfileRangeOfT<T>::logical_profile;
+
+// Extract the minimal syntactic profile of a range (error if not at least).
+template <class T>
+using MinProfileOfT = typename ProfileRangeOfT<T>::min_profile;
+
+// Extract the maximum syntactic profile of a range (error if more than).
+template <class T>
+using MaxProfileOfT = typename ProfileRangeOfT<T>::max_profile;
+
+////////////////////////////////////////////////////////////////////////////////
+//
+template <class T>
+struct IsProfileOrProfileRange : IsProfile<T>::type {};
+
+template <class StrictnessDomain, class LogicalProf, class MinProf,
+          class MaxProf>
+struct IsProfileOrProfileRange<
+    StrictProfileRange<StrictnessDomain, LogicalProf, MinProf, MaxProf>>
+    : std::true_type {};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// TODO(calabrese): Consider naming the functions in this class the same as
+// the macros (defined later on) so that auto-complete leads to the correct name
+// and so that a user cannot accidentally call a function rather than the macro
+// form.
+template <bool ExpectSuccess, class T, class... EqClasses>
+struct ExpectConformanceOf {
+  // Add a value to be tested. Subsequent calls to this function on the same
+  // object must specify logically "larger" values with respect to the
+  // comparison operators of the type, if any.
+  //
+  // NOTE: This function should not be called directly. A stateless lambda is
+  // implicitly formed and passed when using the INITIALIZER macro at the bottom
+  // of this file.
+  template <class Fun,
+            absl::enable_if_t<std::is_same<
+                ResultOfGeneratorT<GeneratorType<Fun>>, T>::value>** = nullptr>
+  ABSL_MUST_USE_RESULT ExpectConformanceOf<ExpectSuccess, T, EqClasses...,
+                                           EquivalenceClassType<Fun>>
+  initializer(GeneratorType<Fun> fun) && {
+    return {
+        {std::tuple_cat(absl::move(ordered_vals.eq_classes),
+                        std::make_tuple((EquivalenceClass)(absl::move(fun))))},
+        std::move(expected_failed_tests)};
+  }
+
+  template <class... TestNames,
+            absl::enable_if_t<!ExpectSuccess && sizeof...(EqClasses) == 0 &&
+                              absl::conjunction<std::is_convertible<
+                                  TestNames, absl::string_view>...>::value>** =
+                nullptr>
+  ABSL_MUST_USE_RESULT ExpectConformanceOf<ExpectSuccess, T, EqClasses...>
+  due_to(TestNames&&... test_names) && {
+    (InsertEach)(&expected_failed_tests,
+                 absl::AsciiStrToLower(absl::string_view(test_names))...);
+
+    return {absl::move(ordered_vals), std::move(expected_failed_tests)};
+  }
+
+  template <class... TestNames, int = 0,  // MSVC disambiguator
+            absl::enable_if_t<ExpectSuccess && sizeof...(EqClasses) == 0 &&
+                              absl::conjunction<std::is_convertible<
+                                  TestNames, absl::string_view>...>::value>** =
+                nullptr>
+  ABSL_MUST_USE_RESULT ExpectConformanceOf<ExpectSuccess, T, EqClasses...>
+  due_to(TestNames&&... test_names) && {
+    // TODO(calabrese) Instead have DUE_TO only exist via a CRTP base.
+    // This would produce better errors messages than the static_assert.
+    static_assert(!ExpectSuccess,
+                  "DUE_TO cannot be called when conformance is expected -- did "
+                  "you mean to use ASSERT_NONCONFORMANCE_OF?");
+  }
+
+  // Add a value to be tested. Subsequent calls to this function on the same
+  // object must specify logically "larger" values with respect to the
+  // comparison operators of the type, if any.
+  //
+  // NOTE: This function should not be called directly. A stateful lambda is
+  // implicitly formed and passed when using the INITIALIZER macro at the bottom
+  // of this file.
+  template <class Fun,
+            absl::enable_if_t<std::is_same<
+                ResultOfGeneratorT<GeneratorType<Fun>>, T>::value>** = nullptr>
+  ABSL_MUST_USE_RESULT ExpectConformanceOf<ExpectSuccess, T, EqClasses...,
+                                           EquivalenceClassType<Fun>>
+  dont_class_directly_stateful_initializer(GeneratorType<Fun> fun) && {
+    return {
+        {std::tuple_cat(absl::move(ordered_vals.eq_classes),
+                        std::make_tuple((EquivalenceClass)(absl::move(fun))))},
+        std::move(expected_failed_tests)};
+  }
+
+  // Add a set of value to be tested, where each value is equal with respect to
+  // the comparison operators and std::hash specialization, if defined.
+  template <
+      class... Funs,
+      absl::void_t<absl::enable_if_t<std::is_same<
+          ResultOfGeneratorT<GeneratorType<Funs>>, T>::value>...>** = nullptr>
+  ABSL_MUST_USE_RESULT ExpectConformanceOf<ExpectSuccess, T, EqClasses...,
+                                           EquivalenceClassType<Funs...>>
+  equivalence_class(GeneratorType<Funs>... funs) && {
+    return {{std::tuple_cat(
+                absl::move(ordered_vals.eq_classes),
+                std::make_tuple((EquivalenceClass)(absl::move(funs)...)))},
+            std::move(expected_failed_tests)};
+  }
+
+  // Execute the tests for the captured set of values, strictly matching a range
+  // of expected profiles in a given domain.
+  template <
+      class ProfRange,
+      absl::enable_if_t<IsProfileOrProfileRange<ProfRange>::value>** = nullptr>
+  ABSL_MUST_USE_RESULT ::testing::AssertionResult with_strict_profile(
+      ProfRange /*profile*/) {
+    ConformanceErrors test_result =
+        (ExpectRegularityImpl<
+            T, LogicalProfileOfT<ProfRange>, MinProfileOfT<ProfRange>,
+            MaxProfileOfT<ProfRange>>)(absl::move(ordered_vals));
+
+    return ExpectSuccess ? test_result.assertionResult()
+                         : test_result.expectFailedTests(expected_failed_tests);
+  }
+
+  // Execute the tests for the captured set of values, loosely matching a range
+  // of expected profiles (loose in that an interface is allowed to be more
+  // refined that a profile suggests, such as a type having a noexcept copy
+  // constructor when all that is required is that the copy constructor exists).
+  template <class Prof, absl::enable_if_t<IsProfile<Prof>::value>** = nullptr>
+  ABSL_MUST_USE_RESULT ::testing::AssertionResult with_loose_profile(
+      Prof /*profile*/) {
+    ConformanceErrors test_result =
+        (ExpectRegularityImpl<
+            T, Prof, Prof,
+            CombineProfiles<TriviallyCompleteProfile,
+                            NothrowComparableProfile>>)(absl::
+                                                            move(ordered_vals));
+
+    return ExpectSuccess ? test_result.assertionResult()
+                         : test_result.expectFailedTests(expected_failed_tests);
+  }
+
+  OrderedEquivalenceClasses<EqClasses...> ordered_vals;
+  std::set<std::string> expected_failed_tests;
+};
+
+template <class T>
+using ExpectConformanceOfType = ExpectConformanceOf</*ExpectSuccess=*/true, T>;
+
+template <class T>
+using ExpectNonconformanceOfType =
+    ExpectConformanceOf</*ExpectSuccess=*/false, T>;
+
+struct EquivalenceClassMaker {
+  // TODO(calabrese) Constrain to callable
+  template <class Fun>
+  static GeneratorType<Fun> initializer(GeneratorType<Fun> fun) {
+    return fun;
+  }
+};
+
+// A top-level macro that begins the builder pattern.
+//
+// The argument here takes the datatype to be tested.
+#define ABSL_INTERNAL_ASSERT_CONFORMANCE_OF(...)                            \
+  GTEST_AMBIGUOUS_ELSE_BLOCKER_                                             \
+  if ABSL_INTERNAL_LPAREN                                                   \
+  const ::testing::AssertionResult gtest_ar =                               \
+      ABSL_INTERNAL_LPAREN ::absl::types_internal::ExpectConformanceOfType< \
+          __VA_ARGS__>()
+
+// Akin to ASSERT_CONFORMANCE_OF except that it expects failure and tries to
+// match text.
+#define ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(...)                            \
+  GTEST_AMBIGUOUS_ELSE_BLOCKER_                                                \
+  if ABSL_INTERNAL_LPAREN                                                      \
+  const ::testing::AssertionResult gtest_ar =                                  \
+      ABSL_INTERNAL_LPAREN ::absl::types_internal::ExpectNonconformanceOfType< \
+          __VA_ARGS__>()
+
+////////////////////////////////////////////////////////////////////////////////
+// NOTE: The following macros look like they are recursive, but are not (macros
+// cannot recurse). These actually refer to member functions of the same name.
+// This is done intentionally so that a user cannot accidentally invoke a
+// member function of the conformance-testing suite without going through the
+// macro.
+////////////////////////////////////////////////////////////////////////////////
+
+// Specify expected test failures as comma-separated strings.
+#define DUE_TO(...) due_to(__VA_ARGS__)
+
+// Specify a value to be tested.
+//
+// Note: Internally, this takes an expression and turns it into the return value
+// of lambda that captures no data. The expression is stringized during
+// preprocessing so that it can be used in error reports.
+#define INITIALIZER(...)                         \
+  initializer(::absl::types_internal::Generator( \
+      [] { return __VA_ARGS__; }, ABSL_INTERNAL_STRINGIZE(__VA_ARGS__)))
+
+// Specify a value to be tested.
+//
+// Note: Internally, this takes an expression and turns it into the return value
+// of lambda that captures data by reference. The expression is stringized
+// during preprocessing so that it can be used in error reports.
+#define STATEFUL_INITIALIZER(...)                         \
+  stateful_initializer(::absl::types_internal::Generator( \
+      [&] { return __VA_ARGS__; }, ABSL_INTERNAL_STRINGIZE(__VA_ARGS__)))
+
+// Used in the builder-pattern.
+//
+// Takes a series of INITIALIZER and/or STATEFUL_INITIALIZER invocations and
+// forwards them along to be tested, grouping them such that the testing suite
+// knows that they are supposed to represent the same logical value (the values
+// compare the same, hash the same, etc.).
+#define EQUIVALENCE_CLASS(...)                    \
+  equivalence_class(ABSL_INTERNAL_TRANSFORM_ARGS( \
+      ABSL_INTERNAL_PREPEND_EQ_MAKER, __VA_ARGS__))
+
+// An invocation of this or WITH_STRICT_PROFILE must end the builder-pattern.
+// It takes a Profile as its argument.
+//
+// This executes the tests and allows types that are "more referined" than the
+// profile specifies, but not less. For instance, if the Profile specifies
+// noexcept copy-constructiblity, the test will fail if the copy-constructor is
+// not noexcept, however, it will succeed if the copy constructor is trivial.
+//
+// This is useful for testing that a type meets some minimum set of
+// requirements.
+#define WITH_LOOSE_PROFILE(...)                                      \
+  with_loose_profile(                                                \
+      ::absl::types_internal::MakeLooseProfileRangeT<__VA_ARGS__>()) \
+      ABSL_INTERNAL_RPAREN ABSL_INTERNAL_RPAREN;                     \
+  else GTEST_FATAL_FAILURE_(gtest_ar.failure_message())  // NOLINT
+
+// An invocation of this or WITH_STRICT_PROFILE must end the builder-pattern.
+// It takes a Domain and a Profile as its arguments.
+//
+// This executes the tests and disallows types that differ at all from the
+// properties of the Profile. For instance, if the Profile specifies noexcept
+// copy-constructiblity, the test will fail if the copy constructor is trivial.
+//
+// This is useful for testing that a type does not do anything more than a
+// specification requires, such as to minimize things like Hyrum's Law, or more
+// commonly, to prevent a type from being "accidentally" copy-constructible in
+// a way that may produce incorrect results, simply because the user forget to
+// delete that operation.
+#define WITH_STRICT_PROFILE(...)                                      \
+  with_strict_profile(                                                \
+      ::absl::types_internal::MakeStrictProfileRangeT<__VA_ARGS__>()) \
+      ABSL_INTERNAL_RPAREN ABSL_INTERNAL_RPAREN;                      \
+  else GTEST_FATAL_FAILURE_(gtest_ar.failure_message())  // NOLINT
+
+// Internal macro that is used in the internals of the EDSL when forming
+// equivalence classes.
+#define ABSL_INTERNAL_PREPEND_EQ_MAKER(arg) \
+  ::absl::types_internal::EquivalenceClassMaker().arg
+
+}  // namespace types_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_TYPES_INTERNAL_CONFORMANCE_TESTING_H_
diff --git a/absl/types/internal/conformance_testing_helpers.h b/absl/types/internal/conformance_testing_helpers.h
new file mode 100644
index 000000000000..00775f960c36
--- /dev/null
+++ b/absl/types/internal/conformance_testing_helpers.h
@@ -0,0 +1,391 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      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,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_TYPES_INTERNAL_CONFORMANCE_TESTING_HELPERS_H_
+#define ABSL_TYPES_INTERNAL_CONFORMANCE_TESTING_HELPERS_H_
+
+// Checks to determine whether or not we can use abi::__cxa_demangle
+#if (defined(__ANDROID__) || defined(ANDROID)) && !defined(OS_ANDROID)
+#define ABSL_INTERNAL_OS_ANDROID
+#endif
+
+// We support certain compilers only.  See demangle.h for details.
+#if defined(OS_ANDROID) && (defined(__i386__) || defined(__x86_64__))
+#define ABSL_TYPES_INTERNAL_HAS_CXA_DEMANGLE 0
+#elif (__GNUC__ >= 4 || (__GNUC__ >= 3 && __GNUC_MINOR__ >= 4)) && \
+    !defined(__mips__)
+#define ABSL_TYPES_INTERNAL_HAS_CXA_DEMANGLE 1
+#elif defined(__clang__) && !defined(_MSC_VER)
+#define ABSL_TYPES_INTERNAL_HAS_CXA_DEMANGLE 1
+#else
+#define ABSL_TYPES_INTERNAL_HAS_CXA_DEMANGLE 0
+#endif
+
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+#include "absl/meta/type_traits.h"
+#include "absl/strings/string_view.h"
+#include "absl/utility/utility.h"
+
+#if ABSL_TYPES_INTERNAL_HAS_CXA_DEMANGLE
+#include <cxxabi.h>
+
+#include <cstdlib>
+#endif
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace types_internal {
+
+// Return a readable name for type T.
+template <class T>
+absl::string_view NameOfImpl() {
+// TODO(calabrese) Investigate using debugging:internal_demangle as a fallback.
+#if ABSL_TYPES_INTERNAL_HAS_CXA_DEMANGLE
+  int status = 0;
+  char* demangled_name = nullptr;
+
+  demangled_name =
+      abi::__cxa_demangle(typeid(T).name(), nullptr, nullptr, &status);
+
+  if (status == 0 && demangled_name != nullptr) {
+    return demangled_name;
+  } else {
+    return typeid(T).name();
+  }
+#else
+  return typeid(T).name();
+#endif
+  // NOTE: We intentionally leak demangled_name so that it remains valid
+  // throughout the remainder of the program.
+}
+
+// Given a type, returns as nice of a type name as we can produce (demangled).
+//
+// Note: This currently strips cv-qualifiers and references, but that is okay
+// because we only use this internally with unqualified object types.
+template <class T>
+std::string NameOf() {
+  static const absl::string_view result = NameOfImpl<T>();
+  return std::string(result);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// Metafunction to check if a type is callable with no explicit arguments
+template <class Fun, class /*Enabler*/ = void>
+struct IsNullaryCallableImpl : std::false_type {};
+
+template <class Fun>
+struct IsNullaryCallableImpl<
+    Fun, absl::void_t<decltype(std::declval<const Fun&>()())>>
+    : std::true_type {
+  using result_type = decltype(std::declval<const Fun&>()());
+
+  template <class ValueType>
+  using for_type = std::is_same<ValueType, result_type>;
+
+  using void_if_true = void;
+};
+
+template <class Fun>
+struct IsNullaryCallable : IsNullaryCallableImpl<Fun> {};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// A type that contains a function object that returns an instance of a type
+// that is undergoing conformance testing. This function is required to always
+// return the same value upon invocation.
+template <class Fun>
+struct GeneratorType;
+
+// A type that contains a tuple of GeneratorType<Fun> where each Fun has the
+// same return type. The result of each of the different generators should all
+// be equal values, though the underlying object representation may differ (such
+// as if one returns 0.0 and another return -0.0, or if one returns an empty
+// vector and another returns an empty vector with a different capacity.
+template <class... Funs>
+struct EquivalenceClassType;
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A metafunction to check if a type is a specialization of EquivalenceClassType
+template <class T>
+struct IsEquivalenceClass : std::false_type {};
+
+template <>
+struct IsEquivalenceClass<EquivalenceClassType<>> : std::true_type {
+  using self = IsEquivalenceClass;
+
+  // A metafunction to check if this EquivalenceClassType is a valid
+  // EquivalenceClassType for a type `ValueType` that is undergoing testing
+  template <class ValueType>
+  using for_type = std::true_type;
+};
+
+template <class Head, class... Tail>
+struct IsEquivalenceClass<EquivalenceClassType<Head, Tail...>>
+    : std::true_type {
+  using self = IsEquivalenceClass;
+
+  // The type undergoing conformance testing that this EquivalenceClass
+  // corresponds to
+  using result_type = typename IsNullaryCallable<Head>::result_type;
+
+  // A metafunction to check if this EquivalenceClassType is a valid
+  // EquivalenceClassType for a type `ValueType` that is undergoing testing
+  template <class ValueType>
+  using for_type = std::is_same<ValueType, result_type>;
+};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// A type that contains an ordered series of EquivalenceClassTypes, where the
+// the function object of each underlying GeneratorType has the same return type
+//
+// These equivalence classes are required to be in a logical ascending order
+// that is consistent with comparison operators that are defined for the return
+// type of each GeneratorType, if any.
+template <class... EqClasses>
+struct OrderedEquivalenceClasses;
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A metafunction to determine the return type of the function object contained
+// in a GeneratorType specialization.
+template <class T>
+struct ResultOfGenerator {};
+
+template <class Fun>
+struct ResultOfGenerator<GeneratorType<Fun>> {
+  using type = decltype(std::declval<const Fun&>()());
+};
+
+template <class Fun>
+using ResultOfGeneratorT = typename ResultOfGenerator<GeneratorType<Fun>>::type;
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A metafunction that yields true iff each of Funs is a GeneratorType
+// specialization and they all contain functions with the same return type
+template <class /*Enabler*/, class... Funs>
+struct AreGeneratorsWithTheSameReturnTypeImpl : std::false_type {};
+
+template <>
+struct AreGeneratorsWithTheSameReturnTypeImpl<void> : std::true_type {};
+
+template <class Head, class... Tail>
+struct AreGeneratorsWithTheSameReturnTypeImpl<
+    typename std::enable_if<absl::conjunction<std::is_same<
+        ResultOfGeneratorT<Head>, ResultOfGeneratorT<Tail>>...>::value>::type,
+    Head, Tail...> : std::true_type {};
+
+template <class... Funs>
+struct AreGeneratorsWithTheSameReturnType
+    : AreGeneratorsWithTheSameReturnTypeImpl<void, Funs...>::type {};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// A metafunction that yields true iff each of Funs is an EquivalenceClassType
+// specialization and they all contain GeneratorType specializations that have
+// the same return type
+template <class... EqClasses>
+struct AreEquivalenceClassesOfTheSameType {
+  static_assert(sizeof...(EqClasses) != sizeof...(EqClasses), "");
+};
+
+template <>
+struct AreEquivalenceClassesOfTheSameType<> : std::true_type {
+  using self = AreEquivalenceClassesOfTheSameType;
+
+  // Metafunction to check that a type is the same as all of the equivalence
+  // classes, if any.
+  // Note: In this specialization there are no equivalence classes, so the
+  // value type is always compatible.
+  template <class /*ValueType*/>
+  using for_type = std::true_type;
+};
+
+template <class... Funs>
+struct AreEquivalenceClassesOfTheSameType<EquivalenceClassType<Funs...>>
+    : std::true_type {
+  using self = AreEquivalenceClassesOfTheSameType;
+
+  // Metafunction to check that a type is the same as all of the equivalence
+  // classes, if any.
+  template <class ValueType>
+  using for_type = typename IsEquivalenceClass<
+      EquivalenceClassType<Funs...>>::template for_type<ValueType>;
+};
+
+template <class... TailEqClasses>
+struct AreEquivalenceClassesOfTheSameType<
+    EquivalenceClassType<>, EquivalenceClassType<>, TailEqClasses...>
+    : AreEquivalenceClassesOfTheSameType<TailEqClasses...>::self {};
+
+template <class HeadNextFun, class... TailNextFuns, class... TailEqClasses>
+struct AreEquivalenceClassesOfTheSameType<
+    EquivalenceClassType<>, EquivalenceClassType<HeadNextFun, TailNextFuns...>,
+    TailEqClasses...>
+    : AreEquivalenceClassesOfTheSameType<
+          EquivalenceClassType<HeadNextFun, TailNextFuns...>,
+          TailEqClasses...>::self {};
+
+template <class HeadHeadFun, class... TailHeadFuns, class... TailEqClasses>
+struct AreEquivalenceClassesOfTheSameType<
+    EquivalenceClassType<HeadHeadFun, TailHeadFuns...>, EquivalenceClassType<>,
+    TailEqClasses...>
+    : AreEquivalenceClassesOfTheSameType<
+          EquivalenceClassType<HeadHeadFun, TailHeadFuns...>,
+          TailEqClasses...>::self {};
+
+template <class HeadHeadFun, class... TailHeadFuns, class HeadNextFun,
+          class... TailNextFuns, class... TailEqClasses>
+struct AreEquivalenceClassesOfTheSameType<
+    EquivalenceClassType<HeadHeadFun, TailHeadFuns...>,
+    EquivalenceClassType<HeadNextFun, TailNextFuns...>, TailEqClasses...>
+    : absl::conditional_t<
+          IsNullaryCallable<HeadNextFun>::template for_type<
+              typename IsNullaryCallable<HeadHeadFun>::result_type>::value,
+          AreEquivalenceClassesOfTheSameType<
+              EquivalenceClassType<HeadHeadFun, TailHeadFuns...>,
+              TailEqClasses...>,
+          std::false_type> {};
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// Execute a function for each passed-in parameter.
+template <class Fun, class... Cases>
+void ForEachParameter(const Fun& fun, const Cases&... cases) {
+  const std::initializer_list<bool> results = {
+      (static_cast<void>(fun(cases)), true)...};
+
+  (void)results;
+}
+
+// Execute a function on each passed-in parameter (using a bound function).
+template <class Fun>
+struct ForEachParameterFun {
+  template <class... T>
+  void operator()(const T&... cases) const {
+    (ForEachParameter)(fun, cases...);
+  }
+
+  Fun fun;
+};
+
+// Execute a function on each element of a tuple.
+template <class Fun, class Tup>
+void ForEachTupleElement(const Fun& fun, const Tup& tup) {
+  absl::apply(ForEachParameterFun<Fun>{fun}, tup);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// Execute a function for each combination of two elements of a tuple, including
+// combinations of an element with itself.
+template <class Fun, class... T>
+struct ForEveryTwoImpl {
+  template <class Lhs>
+  struct WithBoundLhs {
+    template <class Rhs>
+    void operator()(const Rhs& rhs) const {
+      fun(lhs, rhs);
+    }
+
+    Fun fun;
+    Lhs lhs;
+  };
+
+  template <class Lhs>
+  void operator()(const Lhs& lhs) const {
+    (ForEachTupleElement)(WithBoundLhs<Lhs>{fun, lhs}, args);
+  }
+
+  Fun fun;
+  std::tuple<T...> args;
+};
+
+template <class Fun, class... T>
+void ForEveryTwo(const Fun& fun, std::tuple<T...> args) {
+  (ForEachTupleElement)(ForEveryTwoImpl<Fun, T...>{fun, args}, args);
+}
+//
+////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// Insert all values into an associative container
+template<class Container>
+void InsertEach(Container* cont) {
+}
+
+template<class Container, class H, class... T>
+void InsertEach(Container* cont, H&& head, T&&... tail) {
+  cont->insert(head);
+  (InsertEach)(cont, tail...);
+}
+//
+////////////////////////////////////////////////////////////////////////////////
+// A template with a nested "Invoke" static-member-function that executes a
+// passed-in Callable when `Condition` is true, otherwise it ignores the
+// Callable. This is useful for executing a function object with a condition
+// that corresponds to whether or not the Callable can be safely instantiated.
+// It has some overlapping uses with C++17 `if constexpr`.
+template <bool Condition>
+struct If;
+
+template <>
+struct If</*Condition =*/false> {
+  template <class Fun, class... P>
+  static void Invoke(const Fun& /*fun*/, P&&... /*args*/) {}
+};
+
+template <>
+struct If</*Condition =*/true> {
+  template <class Fun, class... P>
+  static void Invoke(const Fun& fun, P&&... args) {
+    // TODO(calabrese) Use std::invoke equivalent instead of function-call.
+    fun(absl::forward<P>(args)...);
+  }
+};
+
+//
+// ABSL_INTERNAL_STRINGIZE(...)
+//
+// This variadic macro transforms its arguments into a c-string literal after
+// expansion.
+//
+// Example:
+//
+//   ABSL_INTERNAL_STRINGIZE(std::array<int, 10>)
+//
+// Results in:
+//
+//   "std::array<int, 10>"
+#define ABSL_INTERNAL_STRINGIZE(...) ABSL_INTERNAL_STRINGIZE_IMPL((__VA_ARGS__))
+#define ABSL_INTERNAL_STRINGIZE_IMPL(arg) ABSL_INTERNAL_STRINGIZE_IMPL2 arg
+#define ABSL_INTERNAL_STRINGIZE_IMPL2(...) #__VA_ARGS__
+
+}  // namespace types_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_TYPES_INTERNAL_CONFORMANCE_TESTING_HELPERS_H_
diff --git a/absl/types/internal/conformance_testing_test.cc b/absl/types/internal/conformance_testing_test.cc
index 3dcf53056703..cf262fa6c222 100644
--- a/absl/types/internal/conformance_testing_test.cc
+++ b/absl/types/internal/conformance_testing_test.cc
@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include "absl/types/internal/conformance_testing.h"
+
 #include <new>
 #include <type_traits>
 #include <utility>
@@ -19,6 +21,7 @@
 #include "gtest/gtest.h"
 #include "absl/meta/type_traits.h"
 #include "absl/types/internal/conformance_aliases.h"
+#include "absl/types/internal/conformance_profile.h"
 
 namespace {
 
@@ -1181,6 +1184,373 @@ INSTANTIATE_TYPED_TEST_SUITE_P(CommonComparable, ProfileTest,
                                CommonComparableProfilesToTest);
 INSTANTIATE_TYPED_TEST_SUITE_P(Trivial, ProfileTest, TrivialProfilesToTest);
 
-// TODO(calabrese) Test runtime results
+TEST(ConformanceTestingTest, Basic) {
+  using profile = ti::CombineProfiles<ti::TriviallyCompleteProfile,
+                                      ti::NothrowComparableProfile>;
+
+  using lim = std::numeric_limits<float>;
+
+  ABSL_INTERNAL_ASSERT_CONFORMANCE_OF(float)
+      .INITIALIZER(-lim::infinity())
+      .INITIALIZER(lim::lowest())
+      .INITIALIZER(-1.f)
+      .INITIALIZER(-lim::min())
+      .EQUIVALENCE_CLASS(INITIALIZER(-0.f), INITIALIZER(0.f))
+      .INITIALIZER(lim::min())
+      .INITIALIZER(1.f)
+      .INITIALIZER(lim::max())
+      .INITIALIZER(lim::infinity())
+      .WITH_STRICT_PROFILE(absl::types_internal::RegularityDomain, profile);
+}
+
+struct BadMoveConstruct {
+  BadMoveConstruct() = default;
+  BadMoveConstruct(BadMoveConstruct&& other) noexcept
+      : value(other.value + 1) {}
+  BadMoveConstruct& operator=(BadMoveConstruct&& other) noexcept = default;
+  int value = 0;
+
+  friend bool operator==(BadMoveConstruct const& lhs,
+                         BadMoveConstruct const& rhs) {
+    return lhs.value == rhs.value;
+  }
+  friend bool operator!=(BadMoveConstruct const& lhs,
+                         BadMoveConstruct const& rhs) {
+    return lhs.value != rhs.value;
+  }
+};
+
+struct BadMoveAssign {
+  BadMoveAssign() = default;
+  BadMoveAssign(BadMoveAssign&& other) noexcept = default;
+  BadMoveAssign& operator=(BadMoveAssign&& other) noexcept {
+    int new_value = other.value + 1;
+    value = new_value;
+    return *this;
+  }
+  int value = 0;
+
+  friend bool operator==(BadMoveAssign const& lhs, BadMoveAssign const& rhs) {
+    return lhs.value == rhs.value;
+  }
+  friend bool operator!=(BadMoveAssign const& lhs, BadMoveAssign const& rhs) {
+    return lhs.value != rhs.value;
+  }
+};
+
+enum class WhichCompIsBad { eq, ne, lt, le, ge, gt };
+
+template <WhichCompIsBad Which>
+struct BadCompare {
+  int value;
+
+  friend bool operator==(BadCompare const& lhs, BadCompare const& rhs) {
+    return Which == WhichCompIsBad::eq ? lhs.value != rhs.value
+                                       : lhs.value == rhs.value;
+  }
+
+  friend bool operator!=(BadCompare const& lhs, BadCompare const& rhs) {
+    return Which == WhichCompIsBad::ne ? lhs.value == rhs.value
+                                       : lhs.value != rhs.value;
+  }
+
+  friend bool operator<(BadCompare const& lhs, BadCompare const& rhs) {
+    return Which == WhichCompIsBad::lt ? lhs.value >= rhs.value
+                                       : lhs.value < rhs.value;
+  }
+
+  friend bool operator<=(BadCompare const& lhs, BadCompare const& rhs) {
+    return Which == WhichCompIsBad::le ? lhs.value > rhs.value
+                                       : lhs.value <= rhs.value;
+  }
+
+  friend bool operator>=(BadCompare const& lhs, BadCompare const& rhs) {
+    return Which == WhichCompIsBad::ge ? lhs.value < rhs.value
+                                       : lhs.value >= rhs.value;
+  }
+
+  friend bool operator>(BadCompare const& lhs, BadCompare const& rhs) {
+    return Which == WhichCompIsBad::gt ? lhs.value <= rhs.value
+                                       : lhs.value > rhs.value;
+  }
+};
+
+TEST(ConformanceTestingDeathTest, Failures) {
+  {
+    using profile = ti::CombineProfiles<ti::TriviallyCompleteProfile,
+                                        ti::NothrowComparableProfile>;
+
+    // Note: The initializers are intentionally in the wrong order.
+    ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(float)
+        .INITIALIZER(1.f)
+        .INITIALIZER(0.f)
+        .WITH_LOOSE_PROFILE(profile);
+  }
+
+  {
+    using profile =
+        ti::CombineProfiles<ti::NothrowMovableProfile, ti::EquatableProfile>;
+
+    ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadMoveConstruct)
+        .DUE_TO("Move construction")
+        .INITIALIZER(BadMoveConstruct())
+        .WITH_LOOSE_PROFILE(profile);
+  }
+
+  {
+    using profile =
+        ti::CombineProfiles<ti::NothrowMovableProfile, ti::EquatableProfile>;
+
+    ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadMoveAssign)
+        .DUE_TO("Move assignment")
+        .INITIALIZER(BadMoveAssign())
+        .WITH_LOOSE_PROFILE(profile);
+  }
+}
+
+TEST(ConformanceTestingDeathTest, CompFailures) {
+  using profile = ti::ComparableProfile;
+
+  {
+    using BadComp = BadCompare<WhichCompIsBad::eq>;
+
+    ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadComp)
+        .DUE_TO("Comparison")
+        .INITIALIZER(BadComp{0})
+        .INITIALIZER(BadComp{1})
+        .WITH_LOOSE_PROFILE(profile);
+  }
+
+  {
+    using BadComp = BadCompare<WhichCompIsBad::ne>;
+
+    ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadComp)
+        .DUE_TO("Comparison")
+        .INITIALIZER(BadComp{0})
+        .INITIALIZER(BadComp{1})
+        .WITH_LOOSE_PROFILE(profile);
+  }
+
+  {
+    using BadComp = BadCompare<WhichCompIsBad::lt>;
+
+    ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadComp)
+        .DUE_TO("Comparison")
+        .INITIALIZER(BadComp{0})
+        .INITIALIZER(BadComp{1})
+        .WITH_LOOSE_PROFILE(profile);
+  }
+
+  {
+    using BadComp = BadCompare<WhichCompIsBad::le>;
+
+    ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadComp)
+        .DUE_TO("Comparison")
+        .INITIALIZER(BadComp{0})
+        .INITIALIZER(BadComp{1})
+        .WITH_LOOSE_PROFILE(profile);
+  }
+
+  {
+    using BadComp = BadCompare<WhichCompIsBad::ge>;
+
+    ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadComp)
+        .DUE_TO("Comparison")
+        .INITIALIZER(BadComp{0})
+        .INITIALIZER(BadComp{1})
+        .WITH_LOOSE_PROFILE(profile);
+  }
+
+  {
+    using BadComp = BadCompare<WhichCompIsBad::gt>;
+
+    ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadComp)
+        .DUE_TO("Comparison")
+        .INITIALIZER(BadComp{0})
+        .INITIALIZER(BadComp{1})
+        .WITH_LOOSE_PROFILE(profile);
+  }
+}
+
+struct BadSelfMove {
+  BadSelfMove() = default;
+  BadSelfMove(BadSelfMove&&) = default;
+  BadSelfMove& operator=(BadSelfMove&& other) noexcept {
+    if (this == &other) {
+      broken_state = true;
+    }
+    return *this;
+  }
+
+  friend bool operator==(const BadSelfMove& lhs, const BadSelfMove& rhs) {
+    return !(lhs.broken_state || rhs.broken_state);
+  }
+
+  friend bool operator!=(const BadSelfMove& lhs, const BadSelfMove& rhs) {
+    return lhs.broken_state || rhs.broken_state;
+  }
+
+  bool broken_state = false;
+};
+
+TEST(ConformanceTestingDeathTest, SelfMoveFailure) {
+  using profile = ti::EquatableNothrowMovableProfile;
+
+  {
+    ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadSelfMove)
+        .DUE_TO("Move assignment")
+        .INITIALIZER(BadSelfMove())
+        .WITH_LOOSE_PROFILE(profile);
+  }
+}
+
+struct BadSelfCopy {
+  BadSelfCopy() = default;
+  BadSelfCopy(BadSelfCopy&&) = default;
+  BadSelfCopy(const BadSelfCopy&) = default;
+  BadSelfCopy& operator=(BadSelfCopy&&) = default;
+  BadSelfCopy& operator=(BadSelfCopy const& other) {
+    if (this == &other) {
+      broken_state = true;
+    }
+    return *this;
+  }
+
+  friend bool operator==(const BadSelfCopy& lhs, const BadSelfCopy& rhs) {
+    return !(lhs.broken_state || rhs.broken_state);
+  }
+
+  friend bool operator!=(const BadSelfCopy& lhs, const BadSelfCopy& rhs) {
+    return lhs.broken_state || rhs.broken_state;
+  }
+
+  bool broken_state = false;
+};
+
+TEST(ConformanceTestingDeathTest, SelfCopyFailure) {
+  using profile = ti::EquatableValueProfile;
+
+  {
+    ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadSelfCopy)
+        .DUE_TO("Copy assignment")
+        .INITIALIZER(BadSelfCopy())
+        .WITH_LOOSE_PROFILE(profile);
+  }
+}
+
+struct BadSelfSwap {
+  friend void swap(BadSelfSwap& lhs, BadSelfSwap& rhs) noexcept {
+    if (&lhs == &rhs) lhs.broken_state = true;
+  }
+
+  friend bool operator==(const BadSelfSwap& lhs, const BadSelfSwap& rhs) {
+    return !(lhs.broken_state || rhs.broken_state);
+  }
+
+  friend bool operator!=(const BadSelfSwap& lhs, const BadSelfSwap& rhs) {
+    return lhs.broken_state || rhs.broken_state;
+  }
+
+  bool broken_state = false;
+};
+
+TEST(ConformanceTestingDeathTest, SelfSwapFailure) {
+  using profile = ti::EquatableNothrowMovableProfile;
+
+  {
+    ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadSelfSwap)
+        .DUE_TO("Swap")
+        .INITIALIZER(BadSelfSwap())
+        .WITH_LOOSE_PROFILE(profile);
+  }
+}
+
+struct BadDefaultInitializedMoveAssign {
+  BadDefaultInitializedMoveAssign() : default_initialized(true) {}
+  explicit BadDefaultInitializedMoveAssign(int v) : value(v) {}
+  BadDefaultInitializedMoveAssign(
+      BadDefaultInitializedMoveAssign&& other) noexcept
+      : value(other.value) {}
+  BadDefaultInitializedMoveAssign& operator=(
+      BadDefaultInitializedMoveAssign&& other) noexcept {
+    value = other.value;
+    if (default_initialized) ++value;  // Bad move if lhs is default initialized
+    return *this;
+  }
+
+  friend bool operator==(const BadDefaultInitializedMoveAssign& lhs,
+                         const BadDefaultInitializedMoveAssign& rhs) {
+    return lhs.value == rhs.value;
+  }
+
+  friend bool operator!=(const BadDefaultInitializedMoveAssign& lhs,
+                         const BadDefaultInitializedMoveAssign& rhs) {
+    return lhs.value != rhs.value;
+  }
+
+  bool default_initialized = false;
+  int value = 0;
+};
+
+TEST(ConformanceTestingDeathTest, DefaultInitializedMoveAssignFailure) {
+  using profile =
+      ti::CombineProfiles<ti::DefaultConstructibleNothrowMovableProfile,
+                          ti::EquatableProfile>;
+
+  {
+    ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadDefaultInitializedMoveAssign)
+        .DUE_TO("move assignment")
+        .INITIALIZER(BadDefaultInitializedMoveAssign(0))
+        .WITH_LOOSE_PROFILE(profile);
+  }
+}
+
+struct BadDefaultInitializedCopyAssign {
+  BadDefaultInitializedCopyAssign() : default_initialized(true) {}
+  explicit BadDefaultInitializedCopyAssign(int v) : value(v) {}
+  BadDefaultInitializedCopyAssign(
+      BadDefaultInitializedCopyAssign&& other) noexcept
+      : value(other.value) {}
+  BadDefaultInitializedCopyAssign(const BadDefaultInitializedCopyAssign& other)
+      : value(other.value) {}
+
+  BadDefaultInitializedCopyAssign& operator=(
+      BadDefaultInitializedCopyAssign&& other) noexcept {
+    value = other.value;
+    return *this;
+  }
+
+  BadDefaultInitializedCopyAssign& operator=(
+      const BadDefaultInitializedCopyAssign& other) {
+    value = other.value;
+    if (default_initialized) ++value;  // Bad move if lhs is default initialized
+    return *this;
+  }
+
+  friend bool operator==(const BadDefaultInitializedCopyAssign& lhs,
+                         const BadDefaultInitializedCopyAssign& rhs) {
+    return lhs.value == rhs.value;
+  }
+
+  friend bool operator!=(const BadDefaultInitializedCopyAssign& lhs,
+                         const BadDefaultInitializedCopyAssign& rhs) {
+    return lhs.value != rhs.value;
+  }
+
+  bool default_initialized = false;
+  int value = 0;
+};
+
+TEST(ConformanceTestingDeathTest, DefaultInitializedAssignFailure) {
+  using profile = ti::CombineProfiles<ti::DefaultConstructibleValueProfile,
+                                      ti::EquatableProfile>;
+
+  {
+    ABSL_INTERNAL_ASSERT_NONCONFORMANCE_OF(BadDefaultInitializedCopyAssign)
+        .DUE_TO("copy assignment")
+        .INITIALIZER(BadDefaultInitializedCopyAssign(0))
+        .WITH_LOOSE_PROFILE(profile);
+  }
+}
 
 }  // namespace
diff --git a/absl/types/internal/parentheses.h b/absl/types/internal/parentheses.h
new file mode 100644
index 000000000000..5aebee8fdeb9
--- /dev/null
+++ b/absl/types/internal/parentheses.h
@@ -0,0 +1,34 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      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,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// parentheses.h
+// -----------------------------------------------------------------------------
+//
+// This file contains macros that expand to a left parenthesis and a right
+// parenthesis. These are in their own file and are generated from macros
+// because otherwise clang-format gets confused and clang-format off directives
+// do not help.
+//
+// The parentheses macros are used when wanting to require a rescan before
+// expansion of parenthesized text appearing after a function-style macro name.
+
+#ifndef ABSL_TYPES_INTERNAL_PARENTHESES_H_
+#define ABSL_TYPES_INTERNAL_PARENTHESES_H_
+
+#define ABSL_INTERNAL_LPAREN (
+
+#define ABSL_INTERNAL_RPAREN )
+
+#endif  // ABSL_TYPES_INTERNAL_PARENTHESES_H_
diff --git a/absl/types/internal/transform_args.h b/absl/types/internal/transform_args.h
new file mode 100644
index 000000000000..4a0ab42ac49f
--- /dev/null
+++ b/absl/types/internal/transform_args.h
@@ -0,0 +1,246 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      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,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// transform_args.h
+// -----------------------------------------------------------------------------
+//
+// This file contains a higher-order macro that "transforms" each element of a
+// a variadic argument by a provided secondary macro.
+
+#ifndef ABSL_TYPES_INTERNAL_TRANSFORM_ARGS_H_
+#define ABSL_TYPES_INTERNAL_TRANSFORM_ARGS_H_
+
+//
+// ABSL_INTERNAL_CAT(a, b)
+//
+// This macro takes two arguments and concatenates them together via ## after
+// expansion.
+//
+// Example:
+//
+//   ABSL_INTERNAL_CAT(foo_, bar)
+//
+// Results in:
+//
+//   foo_bar
+#define ABSL_INTERNAL_CAT(a, b) ABSL_INTERNAL_CAT_IMPL(a, b)
+#define ABSL_INTERNAL_CAT_IMPL(a, b) a##b
+
+//
+// ABSL_INTERNAL_TRANSFORM_ARGS(m, ...)
+//
+// This macro takes another macro as an argument followed by a trailing series
+// of additional parameters (up to 32 additional arguments). It invokes the
+// passed-in macro once for each of the additional arguments, with the
+// expansions separated by commas.
+//
+// Example:
+//
+//   ABSL_INTERNAL_TRANSFORM_ARGS(MY_MACRO, a, b, c)
+//
+// Results in:
+//
+//   MY_MACRO(a), MY_MACRO(b), MY_MACRO(c)
+//
+// TODO(calabrese) Handle no arguments as a special case.
+#define ABSL_INTERNAL_TRANSFORM_ARGS(m, ...)             \
+  ABSL_INTERNAL_CAT(ABSL_INTERNAL_TRANSFORM_ARGS,        \
+                    ABSL_INTERNAL_NUM_ARGS(__VA_ARGS__)) \
+  (m, __VA_ARGS__)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS1(m, a0) m(a0)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS2(m, a0, a1) m(a0), m(a1)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS3(m, a0, a1, a2) m(a0), m(a1), m(a2)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS4(m, a0, a1, a2, a3) \
+  m(a0), m(a1), m(a2), m(a3)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS5(m, a0, a1, a2, a3, a4) \
+  m(a0), m(a1), m(a2), m(a3), m(a4)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS6(m, a0, a1, a2, a3, a4, a5) \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS7(m, a0, a1, a2, a3, a4, a5, a6) \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS8(m, a0, a1, a2, a3, a4, a5, a6, a7) \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS9(m, a0, a1, a2, a3, a4, a5, a6, a7, a8) \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS10(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9)                                    \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS11(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9, a10)                               \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), m(a10)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS12(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9, a10, a11)                          \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS13(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9, a10, a11, a12)                     \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS14(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9, a10, a11, a12, a13)                \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS15(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9, a10, a11, a12, a13, a14)           \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS16(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9, a10, a11, a12, a13, a14, a15)      \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS17(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9, a10, a11, a12, a13, a14, a15, a16) \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS18(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9, a10, a11, a12, a13, a14, a15, a16, \
+                                       a17)                                   \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS19(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9, a10, a11, a12, a13, a14, a15, a16, \
+                                       a17, a18)                              \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS20(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9, a10, a11, a12, a13, a14, a15, a16, \
+                                       a17, a18, a19)                         \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+      m(a19)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS21(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9, a10, a11, a12, a13, a14, a15, a16, \
+                                       a17, a18, a19, a20)                    \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+      m(a19), m(a20)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS22(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9, a10, a11, a12, a13, a14, a15, a16, \
+                                       a17, a18, a19, a20, a21)               \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+      m(a19), m(a20), m(a21)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS23(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9, a10, a11, a12, a13, a14, a15, a16, \
+                                       a17, a18, a19, a20, a21, a22)          \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+      m(a19), m(a20), m(a21), m(a22)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS24(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \
+                                       a9, a10, a11, a12, a13, a14, a15, a16, \
+                                       a17, a18, a19, a20, a21, a22, a23)     \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+      m(a19), m(a20), m(a21), m(a22), m(a23)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS25(m, a0, a1, a2, a3, a4, a5, a6, a7, a8,  \
+                                       a9, a10, a11, a12, a13, a14, a15, a16,  \
+                                       a17, a18, a19, a20, a21, a22, a23, a24) \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),        \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18),  \
+      m(a19), m(a20), m(a21), m(a22), m(a23), m(a24)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS26(                                       \
+    m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15,  \
+    a16, a17, a18, a19, a20, a21, a22, a23, a24, a25)                         \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+      m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS27(                                       \
+    m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15,  \
+    a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26)                    \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+      m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS28(                                       \
+    m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15,  \
+    a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27)               \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+      m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS29(                                       \
+    m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15,  \
+    a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28)          \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+      m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27), \
+      m(a28)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS30(                                       \
+    m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15,  \
+    a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28, a29)     \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),       \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \
+      m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27), \
+      m(a28), m(a29)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS31(                                        \
+    m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15,   \
+    a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28, a29, a30) \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),        \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18),  \
+      m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27),  \
+      m(a28), m(a29), m(a30)
+
+#define ABSL_INTERNAL_TRANSFORM_ARGS32(m, a0, a1, a2, a3, a4, a5, a6, a7, a8,  \
+                                       a9, a10, a11, a12, a13, a14, a15, a16,  \
+                                       a17, a18, a19, a20, a21, a22, a23, a24, \
+                                       a25, a26, a27, a28, a29, a30, a31)      \
+  m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9),        \
+      m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18),  \
+      m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27),  \
+      m(a28), m(a29), m(a30), m(a31)
+
+#define ABSL_INTERNAL_NUM_ARGS_IMPL(a0, a1, a2, a3, a4, a5, a6, a7, a8, a9,    \
+                                    a10, a11, a12, a13, a14, a15, a16, a17,    \
+                                    a18, a19, a20, a21, a22, a23, a24, a25,    \
+                                    a26, a27, a28, a29, a30, a31, result, ...) \
+  result
+
+#define ABSL_INTERNAL_FORCE_EXPANSION(...) __VA_ARGS__
+
+#define ABSL_INTERNAL_NUM_ARGS(...)                                            \
+  ABSL_INTERNAL_FORCE_EXPANSION(ABSL_INTERNAL_NUM_ARGS_IMPL(                   \
+      __VA_ARGS__, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, \
+      17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, ))
+
+#endif  // ABSL_TYPES_INTERNAL_TRANSFORM_ARGS_H_