Creation of LTS branch "lts_2020_02_25"20200225

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GitOrigin-RevId: 0033c9ea91a52ade7c6b725aa2ef3cbe15463421
Change-Id: I8a2b70063cb3ab40c6943a6db0fe40cae71ed8d7

1 files changed, 376 insertions, 0 deletions

diff --git a/absl/types/internal/conformance_profile.h b/absl/types/internal/conformance_profile.h
new file mode 100644
index 00000000..e62004fd
--- /dev/null
+++ b/absl/types/internal/conformance_profile.h
@@ -0,0 +1,376 @@
+// 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_profiles.h
+// -----------------------------------------------------------------------------
+//
+// This file contains templates for representing "Regularity Profiles" and
+// concisely-named versions of commonly used Regularity Profiles.
+//
+// A Regularity Profile is a compile-time description of the types of operations
+// that a given type supports, along with properties of those operations when
+// they do exist. For instance, a Regularity Profile may describe a type that
+// has a move-constructor that is noexcept and a copy constructor that is not
+// noexcept. This description can then be examined and passed around to other
+// templates for the purposes of asserting expectations on user-defined types
+// via a series trait checks, or for determining what kinds of run-time tests
+// are able to be performed.
+//
+// Regularity Profiles are also used when creating "archetypes," which are
+// minimum-conforming types that meet all of the requirements of a given
+// Regularity Profile. For more information regarding archetypes, see
+// "conformance_archetypes.h".
+
+#ifndef ABSL_TYPES_INTERNAL_CONFORMANCE_PROFILE_H_
+#define ABSL_TYPES_INTERNAL_CONFORMANCE_PROFILE_H_
+
+#include <type_traits>
+#include <utility>
+
+#include "absl/meta/type_traits.h"
+
+// TODO(calabrese) Add support for extending profiles.
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace types_internal {
+
+template <class T, class /*Enabler*/ = void>
+struct PropertiesOfImpl {};
+
+template <class T>
+struct PropertiesOfImpl<T, absl::void_t<typename T::properties>> {
+  using type = typename T::properties;
+};
+
+template <class T>
+struct PropertiesOfImpl<T, absl::void_t<typename T::profile_alias_of>> {
+  using type = typename PropertiesOfImpl<typename T::profile_alias_of>::type;
+};
+
+template <class T>
+struct PropertiesOf : PropertiesOfImpl<T> {};
+
+template <class T>
+using PropertiesOfT = typename PropertiesOf<T>::type;
+
+// NOTE: These enums use this naming convention to be consistent with the
+// 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 };
+
+#define ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM(name) \
+  enum class name { maybe, yes, nothrow, trivial }
+
+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);
+
+#undef ABSL_INTERNAL_SPECIAL_MEMBER_FUNCTION_ENUM
+
+#define ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM(name) \
+  enum class name { maybe, yes, nothrow }
+
+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(swappable);
+
+#undef ABSL_INTERNAL_INTRINSIC_FUNCTION_ENUM
+
+enum class hashable { maybe, yes };
+
+constexpr const char* PropertyName(hashable v) {
+  return "support for std::hash";
+}
+
+template <
+    default_constructible DefaultConstructibleValue =
+        default_constructible::maybe,
+    move_constructible MoveConstructibleValue = move_constructible::maybe,
+    copy_constructible CopyConstructibleValue = copy_constructible::maybe,
+    move_assignable MoveAssignableValue = move_assignable::maybe,
+    copy_assignable CopyAssignableValue = copy_assignable::maybe,
+    destructible DestructibleValue = destructible::maybe,
+    equality_comparable EqualityComparableValue = equality_comparable::maybe,
+    inequality_comparable InequalityComparableValue =
+        inequality_comparable::maybe,
+    less_than_comparable LessThanComparableValue = less_than_comparable::maybe,
+    less_equal_comparable LessEqualComparableValue =
+        less_equal_comparable::maybe,
+    greater_equal_comparable GreaterEqualComparableValue =
+        greater_equal_comparable::maybe,
+    greater_than_comparable GreaterThanComparableValue =
+        greater_than_comparable::maybe,
+    swappable SwappableValue = swappable::maybe,
+    hashable HashableValue = hashable::maybe>
+struct ConformanceProfile {
+  using properties = ConformanceProfile;
+
+  static constexpr default_constructible
+      default_constructible_support =  // NOLINT
+      DefaultConstructibleValue;
+
+  static constexpr move_constructible move_constructible_support =  // NOLINT
+      MoveConstructibleValue;
+
+  static constexpr copy_constructible copy_constructible_support =  // NOLINT
+      CopyConstructibleValue;
+
+  static constexpr move_assignable move_assignable_support =  // NOLINT
+      MoveAssignableValue;
+
+  static constexpr copy_assignable copy_assignable_support =  // NOLINT
+      CopyAssignableValue;
+
+  static constexpr destructible destructible_support =  // NOLINT
+      DestructibleValue;
+
+  static constexpr equality_comparable equality_comparable_support =  // NOLINT
+      EqualityComparableValue;
+
+  static constexpr inequality_comparable
+      inequality_comparable_support =  // NOLINT
+      InequalityComparableValue;
+
+  static constexpr less_than_comparable
+      less_than_comparable_support =  // NOLINT
+      LessThanComparableValue;
+
+  static constexpr less_equal_comparable
+      less_equal_comparable_support =  // NOLINT
+      LessEqualComparableValue;
+
+  static constexpr greater_equal_comparable
+      greater_equal_comparable_support =  // NOLINT
+      GreaterEqualComparableValue;
+
+  static constexpr greater_than_comparable
+      greater_than_comparable_support =  // NOLINT
+      GreaterThanComparableValue;
+
+  static constexpr swappable swappable_support = SwappableValue;  // NOLINT
+
+  static constexpr hashable hashable_support = HashableValue;  // NOLINT
+
+  static constexpr bool is_default_constructible =  // NOLINT
+      DefaultConstructibleValue != default_constructible::maybe;
+
+  static constexpr bool is_move_constructible =  // NOLINT
+      MoveConstructibleValue != move_constructible::maybe;
+
+  static constexpr bool is_copy_constructible =  // NOLINT
+      CopyConstructibleValue != copy_constructible::maybe;
+
+  static constexpr bool is_move_assignable =  // NOLINT
+      MoveAssignableValue != move_assignable::maybe;
+
+  static constexpr bool is_copy_assignable =  // NOLINT
+      CopyAssignableValue != copy_assignable::maybe;
+
+  static constexpr bool is_destructible =  // NOLINT
+      DestructibleValue != destructible::maybe;
+
+  static constexpr bool is_equality_comparable =  // NOLINT
+      EqualityComparableValue != equality_comparable::maybe;
+
+  static constexpr bool is_inequality_comparable =  // NOLINT
+      InequalityComparableValue != inequality_comparable::maybe;
+
+  static constexpr bool is_less_than_comparable =  // NOLINT
+      LessThanComparableValue != less_than_comparable::maybe;
+
+  static constexpr bool is_less_equal_comparable =  // NOLINT
+      LessEqualComparableValue != less_equal_comparable::maybe;
+
+  static constexpr bool is_greater_equal_comparable =  // NOLINT
+      GreaterEqualComparableValue != greater_equal_comparable::maybe;
+
+  static constexpr bool is_greater_than_comparable =  // NOLINT
+      GreaterThanComparableValue != greater_than_comparable::maybe;
+
+  static constexpr bool is_swappable =  // NOLINT
+      SwappableValue != swappable::maybe;
+
+  static constexpr bool is_hashable =  // NOLINT
+      HashableValue != hashable::maybe;
+};
+
+#define ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF_IMPL(type, name)     \
+  template <default_constructible DefaultConstructibleValue,                   \
+            move_constructible MoveConstructibleValue,                         \
+            copy_constructible CopyConstructibleValue,                         \
+            move_assignable MoveAssignableValue,                               \
+            copy_assignable CopyAssignableValue,                               \
+            destructible DestructibleValue,                                    \
+            equality_comparable EqualityComparableValue,                       \
+            inequality_comparable InequalityComparableValue,                   \
+            less_than_comparable LessThanComparableValue,                      \
+            less_equal_comparable LessEqualComparableValue,                    \
+            greater_equal_comparable GreaterEqualComparableValue,              \
+            greater_than_comparable GreaterThanComparableValue,                \
+            swappable SwappableValue, hashable HashableValue>                  \
+  constexpr type ConformanceProfile<                                           \
+      DefaultConstructibleValue, MoveConstructibleValue,                       \
+      CopyConstructibleValue, MoveAssignableValue, CopyAssignableValue,        \
+      DestructibleValue, EqualityComparableValue, InequalityComparableValue,   \
+      LessThanComparableValue, LessEqualComparableValue,                       \
+      GreaterEqualComparableValue, GreaterThanComparableValue, SwappableValue, \
+      HashableValue>::name
+
+#define ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(type)           \
+  ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF_IMPL(type,            \
+                                                         type##_support); \
+  ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF_IMPL(bool, is_##type)
+
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(default_constructible);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(move_constructible);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(copy_constructible);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(move_assignable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(copy_assignable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(destructible);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(equality_comparable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(inequality_comparable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(less_than_comparable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(less_equal_comparable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(greater_equal_comparable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(greater_than_comparable);
+ABSL_INTERNAL_CONFORMANCE_TESTING_DATA_MEMBER_DEF(swappable);
+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 greatest underlying value.
+// Note: std::max is not constexpr in C++11, which is why this is necessary.
+template <class H>
+constexpr H MaxEnum(H head) {
+  return head;
+}
+
+template <class H, class N, class... T>
+constexpr H MaxEnum(H head, N next, T... tail) {
+  return (UnderlyingValue)(next) < (UnderlyingValue)(head)
+             ? (MaxEnum)(head, tail...)
+             : (MaxEnum)(next, tail...);
+}
+
+template <class... Profs>
+struct CombineProfilesImpl {
+  static constexpr default_constructible
+      default_constructible_support =  // NOLINT
+      (MaxEnum)(PropertiesOfT<Profs>::default_constructible_support...);
+
+  static constexpr move_constructible move_constructible_support =  // NOLINT
+      (MaxEnum)(PropertiesOfT<Profs>::move_constructible_support...);
+
+  static constexpr copy_constructible copy_constructible_support =  // NOLINT
+      (MaxEnum)(PropertiesOfT<Profs>::copy_constructible_support...);
+
+  static constexpr move_assignable move_assignable_support =  // NOLINT
+      (MaxEnum)(PropertiesOfT<Profs>::move_assignable_support...);
+
+  static constexpr copy_assignable copy_assignable_support =  // NOLINT
+      (MaxEnum)(PropertiesOfT<Profs>::copy_assignable_support...);
+
+  static constexpr destructible destructible_support =  // NOLINT
+      (MaxEnum)(PropertiesOfT<Profs>::destructible_support...);
+
+  static constexpr equality_comparable equality_comparable_support =  // NOLINT
+      (MaxEnum)(PropertiesOfT<Profs>::equality_comparable_support...);
+
+  static constexpr inequality_comparable
+      inequality_comparable_support =  // NOLINT
+      (MaxEnum)(PropertiesOfT<Profs>::inequality_comparable_support...);
+
+  static constexpr less_than_comparable
+      less_than_comparable_support =  // NOLINT
+      (MaxEnum)(PropertiesOfT<Profs>::less_than_comparable_support...);
+
+  static constexpr less_equal_comparable
+      less_equal_comparable_support =  // NOLINT
+      (MaxEnum)(PropertiesOfT<Profs>::less_equal_comparable_support...);
+
+  static constexpr greater_equal_comparable
+      greater_equal_comparable_support =  // NOLINT
+      (MaxEnum)(PropertiesOfT<Profs>::greater_equal_comparable_support...);
+
+  static constexpr greater_than_comparable
+      greater_than_comparable_support =  // NOLINT
+      (MaxEnum)(PropertiesOfT<Profs>::greater_than_comparable_support...);
+
+  static constexpr swappable swappable_support =  // NOLINT
+      (MaxEnum)(PropertiesOfT<Profs>::swappable_support...);
+
+  static constexpr hashable hashable_support =  // NOLINT
+      (MaxEnum)(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>;
+};
+
+// NOTE: We use this as opposed to a direct alias of CombineProfilesImpl so that
+// when named aliases of CombineProfiles are created (such as in
+// conformance_aliases.h), we only pay for the combination algorithm on the
+// profiles that are actually used.
+template <class... Profs>
+struct CombineProfiles {
+  using profile_alias_of = CombineProfilesImpl<Profs...>;
+};
+
+template <>
+struct CombineProfiles<> {
+  using properties = ConformanceProfile<>;
+};
+
+template <class Profile, class Tag>
+struct StrongProfileTypedef {
+  using properties = PropertiesOfT<Profile>;
+};
+
+template <class T, class /*Enabler*/ = void>
+struct IsProfileImpl : std::false_type {};
+
+template <class T>
+struct IsProfileImpl<T, absl::void_t<PropertiesOfT<T>>> : std::true_type {};
+
+template <class T>
+struct IsProfile : IsProfileImpl<T>::type {};
+
+}  // namespace types_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_TYPES_INTERNAL_CONFORMANCE_PROFILE_H_