Export of internal Abseil changes.

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4eacae3ff1b14b1d309e8092185bc10e8a6203cf by Derek Mauro <dmauro@google.com>:

Release SwissTable - a fast, efficient, cache-friendly hash table.

https://www.youtube.com/watch?v=ncHmEUmJZf4

PiperOrigin-RevId: 214816527

--
df8c3dfab3cfb2f4365909a84d0683b193cfbb11 by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 214785288

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1eabd5266bbcebc33eecc91e5309b751856a75c8 by Abseil Team <absl-team@google.com>:

Internal change

PiperOrigin-RevId: 214722931

--
2ebbfac950f83146b46253038e7dd7dcde9f2951 by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 214701684
GitOrigin-RevId: 4eacae3ff1b14b1d309e8092185bc10e8a6203cf
Change-Id: I9ba64e395b22ad7863213d157b8019b082adc19d

13 files changed, 5002 insertions, 0 deletions

diff --git a/absl/hash/BUILD.bazel b/absl/hash/BUILD.bazel
new file mode 100644
index 0000000..50aa550
--- /dev/null
+++ b/absl/hash/BUILD.bazel
@@ -0,0 +1,114 @@
+#
+# Copyright 2018 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
+#
+#      http://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.
+#
+
+load(
+    "//absl:copts.bzl",
+    "ABSL_DEFAULT_COPTS",
+    "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"])  # Apache 2.0
+
+cc_library(
+    name = "hash",
+    srcs = [
+        "internal/hash.cc",
+        "internal/hash.h",
+    ],
+    hdrs = ["hash.h"],
+    copts = ABSL_DEFAULT_COPTS,
+    deps = [
+        ":city",
+        "//absl/base:core_headers",
+        "//absl/base:endian",
+        "//absl/container:fixed_array",
+        "//absl/meta:type_traits",
+        "//absl/numeric:int128",
+        "//absl/strings",
+        "//absl/types:optional",
+        "//absl/types:variant",
+        "//absl/utility",
+    ],
+)
+
+cc_library(
+    name = "hash_testing",
+    testonly = 1,
+    hdrs = ["hash_testing.h"],
+    deps = [
+        ":spy_hash_state",
+        "//absl/meta:type_traits",
+        "//absl/strings",
+        "//absl/types:variant",
+        "@com_google_googletest//:gtest",
+    ],
+)
+
+cc_test(
+    name = "hash_test",
+    srcs = ["hash_test.cc"],
+    copts = ABSL_TEST_COPTS,
+    deps = [
+        ":hash",
+        ":hash_testing",
+        "//absl/base:core_headers",
+        "//absl/container:flat_hash_set",
+        "//absl/hash:spy_hash_state",
+        "//absl/meta:type_traits",
+        "//absl/numeric:int128",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_library(
+    name = "spy_hash_state",
+    testonly = 1,
+    hdrs = ["internal/spy_hash_state.h"],
+    copts = ABSL_DEFAULT_COPTS,
+    visibility = ["//visibility:private"],
+    deps = [
+        ":hash",
+        "//absl/strings",
+        "//absl/strings:str_format",
+    ],
+)
+
+cc_library(
+    name = "city",
+    srcs = ["internal/city.cc"],
+    hdrs = [
+        "internal/city.h",
+        "internal/city_crc.h",
+    ],
+    copts = ABSL_DEFAULT_COPTS,
+    deps = [
+        "//absl/base:config",
+        "//absl/base:core_headers",
+        "//absl/base:endian",
+    ],
+)
+
+cc_test(
+    name = "city_test",
+    srcs = ["internal/city_test.cc"],
+    copts = ABSL_TEST_COPTS,
+    deps = [
+        ":city",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
diff --git a/absl/hash/CMakeLists.txt b/absl/hash/CMakeLists.txt
new file mode 100644
index 0000000..35081e3
--- /dev/null
+++ b/absl/hash/CMakeLists.txt
@@ -0,0 +1,80 @@
+#
+# Copyright 2018 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
+#
+#      http://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.
+#
+
+list(APPEND HASH_PUBLIC_HEADERS
+  "hash.h"
+)
+
+list(APPEND HASH_INTERNAL_HEADERS
+  "internal/city.h"
+  "internal/city_crc.h"
+  "internal/hash.h"
+)
+
+# absl_hash library
+list(APPEND HASH_SRC
+  "internal/city.cc"
+  "internal/hash.cc"
+  ${HASH_PUBLIC_HEADERS}
+  ${HASH_INTERNAL_HEADERS}
+)
+
+set(HASH_PUBLIC_LIBRARIES absl::hash absl::container absl::strings absl::str_format absl::utility)
+
+absl_library(
+  TARGET
+    absl_hash
+  SOURCES
+    ${HASH_SRC}
+  PUBLIC_LIBRARIES
+    ${HASH_PUBLIC_LIBRARIES}
+  EXPORT_NAME
+    hash
+)
+
+#
+## TESTS
+#
+
+# testing support
+set(HASH_TEST_HEADERS hash_testing.h internal/spy_hash_state.h)
+set(HASH_TEST_PUBLIC_LIBRARIES absl::hash absl::container absl::numeric absl::strings absl::str_format)
+
+# hash_test
+set(HASH_TEST_SRC "hash_test.cc" ${HASH_TEST_HEADERS})
+
+absl_test(
+  TARGET
+    hash_test
+  SOURCES
+    ${HASH_TEST_SRC}
+  PUBLIC_LIBRARIES
+    ${HASH_TEST_PUBLIC_LIBRARIES}
+)
+
+# hash_test
+set(CITY_TEST_SRC "internal/city_test.cc")
+
+absl_test(
+  TARGET
+    city_test
+  SOURCES
+    ${CITY_TEST_SRC}
+  PUBLIC_LIBRARIES
+    ${HASH_TEST_PUBLIC_LIBRARIES}
+)
+
+
diff --git a/absl/hash/hash.h b/absl/hash/hash.h
new file mode 100644
index 0000000..c7ba4c2
--- /dev/null
+++ b/absl/hash/hash.h
@@ -0,0 +1,312 @@
+// Copyright 2018 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
+//
+//      http://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.
+//
+// -----------------------------------------------------------------------------
+// File: hash.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the Abseil `hash` library and the Abseil hashing
+// framework. This framework consists of the following:
+//
+//   * The `absl::Hash` functor, which is used to invoke the hasher within the
+//     Abseil hashing framework. `absl::Hash<T>` supports most basic types and
+//     a number of Abseil types out of the box.
+//   * `AbslHashValue`, an extension point that allows you to extend types to
+//     support Abseil hashing without requiring you to define a hashing
+//     algorithm.
+//   * `HashState`, a type-erased class which implement the manipulation of the
+//     hash state (H) itself. containing member functions `combine()` and
+//     `combine_contiguous()`, which you can use to contribute to an existing
+//     hash state when hashing your types.
+//
+// Unlike `std::hash` or other hashing frameworks, the Abseil hashing framework
+// provides most of its utility by abstracting away the hash algorithm (and its
+// implementation) entirely. Instead, a type invokes the Abseil hashing
+// framework by simply combining its state with the state of known, hashable
+// types. Hashing of that combined state is separately done by `absl::Hash`.
+//
+// Example:
+//
+//   // Suppose we have a class `Circle` for which we want to add hashing
+//   class Circle {
+//     public:
+//       ...
+//     private:
+//       std::pair<int, int> center_;
+//       int radius_;
+//     };
+//
+//   // To add hashing support to `Circle`, we simply need to add an ordinary
+//   // function `AbslHashValue()`, and return the combined hash state of the
+//   // existing hash state and the class state:
+//
+//     template <typename H>
+//     friend H AbslHashValue(H h, const Circle& c) {
+//       return H::combine(std::move(h), c.center_, c.radius_);
+//     }
+//
+// For more information, see Adding Type Support to `absl::Hash` below.
+//
+#ifndef ABSL_HASH_HASH_H_
+#define ABSL_HASH_HASH_H_
+
+#include "absl/hash/internal/hash.h"
+
+namespace absl {
+
+// -----------------------------------------------------------------------------
+// `absl::Hash`
+// -----------------------------------------------------------------------------
+//
+// `absl::Hash<T>` is a convenient general-purpose hash functor for a type `T`
+// satisfying any of the following conditions (in order):
+//
+//  * T is an arithmetic or pointer type
+//  * T defines an overload for `AbslHashValue(H, const T&)` for an arbitrary
+//    hash state `H`.
+//  - T defines a specialization of `HASH_NAMESPACE::hash<T>`
+//  - T defines a specialization of `std::hash<T>`
+//
+// `absl::Hash` intrinsically supports the following types:
+//
+//   * All integral types (including bool)
+//   * All enum types
+//   * All floating-point types (although hashing them is discouraged)
+//   * All pointer types, including nullptr_t
+//   * std::pair<T1, T2>, if T1 and T2 are hashable
+//   * std::tuple<Ts...>, if all the Ts... are hashable
+//   * std::unique_ptr and std::shared_ptr
+//   * All string-like types including:
+//     * std::string
+//     * std::string_view (as well as any instance of std::basic_string that
+//       uses char and std::char_traits)
+//  * All the standard sequence containers (provided the elements are hashable)
+//  * All the standard ordered associative containers (provided the elements are
+//    hashable)
+//  * absl types such as the following:
+//    * absl::string_view
+//    * absl::InlinedVector
+//    * absl::FixedArray
+//    * absl::unit128
+//    * absl::Time, absl::Duration, and absl::TimeZone
+//
+// Note: the list above is not meant to be exhaustive. Additional type support
+// may be added, in which case the above list will be updated.
+//
+// -----------------------------------------------------------------------------
+// absl::Hash Invocation Evaluation
+// -----------------------------------------------------------------------------
+//
+// When invoked, `absl::Hash<T>` searches for supplied hash functions in the
+// following order:
+//
+//   * Natively supported types out of the box (see above)
+//   * Types for which an `AbslHashValue()` overload is provided (such as
+//     user-defined types). See "Adding Type Support to `absl::Hash`" below.
+//   * Types which define a `HASH_NAMESPACE::hash<T>` specialization (aka
+//     `__gnu_cxx::hash<T>` for gcc/Clang or `stdext::hash<T>` for MSVC)
+//   * Types which define a `std::hash<T>` specialization
+//
+// The fallback to legacy hash functions exists mainly for backwards
+// compatibility. If you have a choice, prefer defining an `AbslHashValue`
+// overload instead of specializing any legacy hash functors.
+//
+// -----------------------------------------------------------------------------
+// The Hash State Concept, and using `HashState` for Type Erasure
+// -----------------------------------------------------------------------------
+//
+// The `absl::Hash` framework relies on the Concept of a "hash state." Such a
+// hash state is used in several places:
+//
+// * Within existing implementations of `absl::Hash<T>` to store the hashed
+//   state of an object. Note that it is up to the implementation how it stores
+//   such state. A hash table, for example, may mix the state to produce an
+//   integer value; a testing framework may simply hold a vector of that state.
+// * Within implementations of `AbslHashValue()` used to extend user-defined
+//   types. (See "Adding Type Support to absl::Hash" below.)
+// * Inside a `HashState`, providing type erasure for the concept of a hash
+//   state, which you can use to extend the `absl::Hash` framework for types
+//   that are otherwise difficult to extend using `AbslHashValue()`. (See the
+//   `HashState` class below.)
+//
+// The "hash state" concept contains two member functions for mixing hash state:
+//
+// * `H::combine()`
+//
+//   Combines an arbitrary number of values into a hash state, returning the
+//   updated state. Note that the existing hash state is move-only and must be
+//   passed by value.
+//
+//   Each of the value types T must be hashable by H.
+//
+//   NOTE:
+//
+//     state = H::combine(std::move(state), value1, value2, value3);
+//
+//   must be guaranteed to produce the same hash expansion as
+//
+//     state = H::combine(std::move(state), value1);
+//     state = H::combine(std::move(state), value2);
+//     state = H::combine(std::move(state), value3);
+//
+// * `H::combine_contiguous()`
+//
+//    Combines a contiguous array of `size` elements into a hash state,
+//    returning the updated state. Note that the existing hash state is
+//    move-only and must be passed by value.
+//
+//    NOTE:
+//
+//      state = H::combine_contiguous(std::move(state), data, size);
+//
+//    need NOT be guaranteed to produce the same hash expansion as a loop
+//    (it may perform internal optimizations). If you need this guarantee, use a
+//    loop instead.
+//
+// -----------------------------------------------------------------------------
+// Adding Type Support to `absl::Hash`
+// -----------------------------------------------------------------------------
+//
+// To add support for your user-defined type, add a proper `AbslHashValue()`
+// overload as a free (non-member) function. The overload will take an
+// existing hash state and should combine that state with state from the type.
+//
+// Example:
+//
+//   template <typename H>
+//   H AbslHashValue(H state, const MyType& v) {
+//     return H::combine(std::move(state), v.field1, ..., v.fieldN);
+//   }
+//
+// where `(field1, ..., fieldN)` are the members you would use on your
+// `operator==` to define equality.
+//
+// Notice that `AbslHashValue` is not a class member, but an ordinary function.
+// An `AbslHashValue` overload for a type should only be declared in the same
+// file and namespace as said type. The proper `AbslHashValue` implementation
+// for a given type will be discovered via ADL.
+//
+// Note: unlike `std::hash', `absl::Hash` should never be specialized. It must
+// only be extended by adding `AbslHashValue()` overloads.
+//
+template <typename T>
+using Hash = absl::hash_internal::Hash<T>;
+
+// HashState
+//
+// A type erased version of the hash state concept, for use in user-defined
+// `AbslHashValue` implementations that can't use templates (such as PImpl
+// classes, virtual functions, etc.). The type erasure adds overhead so it
+// should be avoided unless necessary.
+//
+// Note: This wrapper will only erase calls to:
+//     combine_contiguous(H, const unsigned char*, size_t)
+//
+// All other calls will be handled internally and will not invoke overloads
+// provided by the wrapped class.
+//
+// Users of this class should still define a template `AbslHashValue` function,
+// but can use `absl::HashState::Create(&state)` to erase the type of the hash
+// state and dispatch to their private hashing logic.
+//
+// This state can be used like any other hash state. In particular, you can call
+// `HashState::combine()` and `HashState::combine_contiguous()` on it.
+//
+// Example:
+//
+//   class Interface {
+//    public:
+//     template <typename H>
+//     friend H AbslHashValue(H state, const Interface& value) {
+//       state = H::combine(std::move(state), std::type_index(typeid(*this)));
+//       value.HashValue(absl::HashState::Create(&state));
+//       return state;
+//     }
+//    private:
+//     virtual void HashValue(absl::HashState state) const = 0;
+//  };
+//
+//   class Impl : Interface {
+//    private:
+//     void HashValue(absl::HashState state) const override {
+//       absl::HashState::combine(std::move(state), v1_, v2_);
+//     }
+//     int v1_;
+//     string v2_;
+//   };
+class HashState : public hash_internal::HashStateBase<HashState> {
+ public:
+  // HashState::Create()
+  //
+  // Create a new `HashState` instance that wraps `state`. All calls to
+  // `combine()` and `combine_contiguous()` on the new instance will be
+  // redirected to the original `state` object. The `state` object must outlive
+  // the `HashState` instance.
+  template <typename T>
+  static HashState Create(T* state) {
+    HashState s;
+    s.Init(state);
+    return s;
+  }
+
+  HashState(const HashState&) = delete;
+  HashState& operator=(const HashState&) = delete;
+  HashState(HashState&&) = default;
+  HashState& operator=(HashState&&) = default;
+
+  // HashState::combine()
+  //
+  // Combines an arbitrary number of values into a hash state, returning the
+  // updated state.
+  using HashState::HashStateBase::combine;
+
+  // HashState::combine_contiguous()
+  //
+  // Combines a contiguous array of `size` elements into a hash state, returning
+  // the updated state.
+  static HashState combine_contiguous(HashState hash_state,
+                                      const unsigned char* first, size_t size) {
+    hash_state.combine_contiguous_(hash_state.state_, first, size);
+    return hash_state;
+  }
+  using HashState::HashStateBase::combine_contiguous;
+
+ private:
+  HashState() = default;
+
+  template <typename T>
+  static void CombineContiguousImpl(void* p, const unsigned char* first,
+                                    size_t size) {
+    T& state = *static_cast<T*>(p);
+    state = T::combine_contiguous(std::move(state), first, size);
+  }
+
+  template <typename T>
+  void Init(T* state) {
+    state_ = state;
+    combine_contiguous_ = &CombineContiguousImpl<T>;
+  }
+
+  // Do not erase an already erased state.
+  void Init(HashState* state) {
+    state_ = state->state_;
+    combine_contiguous_ = state->combine_contiguous_;
+  }
+
+  void* state_;
+  void (*combine_contiguous_)(void*, const unsigned char*, size_t);
+};
+
+}  // namespace absl
+#endif  // ABSL_HASH_HASH_H_
diff --git a/absl/hash/hash_test.cc b/absl/hash/hash_test.cc
new file mode 100644
index 0000000..7b6fb2e
--- /dev/null
+++ b/absl/hash/hash_test.cc
@@ -0,0 +1,425 @@
+// Copyright 2018 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
+//
+//      http://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.
+
+#include "absl/hash/hash.h"
+
+#include <array>
+#include <cstring>
+#include <deque>
+#include <forward_list>
+#include <functional>
+#include <iterator>
+#include <limits>
+#include <list>
+#include <map>
+#include <memory>
+#include <numeric>
+#include <random>
+#include <set>
+#include <string>
+#include <tuple>
+#include <type_traits>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/container/flat_hash_set.h"
+#include "absl/hash/hash_testing.h"
+#include "absl/hash/internal/spy_hash_state.h"
+#include "absl/meta/type_traits.h"
+#include "absl/numeric/int128.h"
+
+namespace {
+
+using absl::Hash;
+using absl::hash_internal::SpyHashState;
+
+template <typename T>
+class HashValueIntTest : public testing::Test {
+};
+TYPED_TEST_CASE_P(HashValueIntTest);
+
+template <typename T>
+SpyHashState SpyHash(const T& value) {
+  return SpyHashState::combine(SpyHashState(), value);
+}
+
+// Helper trait to verify if T is hashable. We use absl::Hash's poison status to
+// detect it.
+template <typename T>
+using is_hashable = std::is_default_constructible<absl::Hash<T>>;
+
+TYPED_TEST_P(HashValueIntTest, BasicUsage) {
+  EXPECT_TRUE((is_hashable<TypeParam>::value));
+
+  TypeParam n = 42;
+  EXPECT_EQ(SpyHash(n), SpyHash(TypeParam{42}));
+  EXPECT_NE(SpyHash(n), SpyHash(TypeParam{0}));
+  EXPECT_NE(SpyHash(std::numeric_limits<TypeParam>::max()),
+            SpyHash(std::numeric_limits<TypeParam>::min()));
+}
+
+TYPED_TEST_P(HashValueIntTest, FastPath) {
+  // Test the fast-path to make sure the values are the same.
+  TypeParam n = 42;
+  EXPECT_EQ(absl::Hash<TypeParam>{}(n),
+            absl::Hash<std::tuple<TypeParam>>{}(std::tuple<TypeParam>(n)));
+}
+
+REGISTER_TYPED_TEST_CASE_P(HashValueIntTest, BasicUsage, FastPath);
+using IntTypes = testing::Types<unsigned char, char, int, int32_t, int64_t, uint32_t,
+                                uint64_t, size_t>;
+INSTANTIATE_TYPED_TEST_CASE_P(My, HashValueIntTest, IntTypes);
+
+template <typename T, typename = void>
+struct IsHashCallble : std::false_type {};
+
+template <typename T>
+struct IsHashCallble<T, absl::void_t<decltype(std::declval<absl::Hash<T>>()(
+                            std::declval<const T&>()))>> : std::true_type {};
+
+template <typename T, typename = void>
+struct IsAggregateInitializable : std::false_type {};
+
+template <typename T>
+struct IsAggregateInitializable<T, absl::void_t<decltype(T{})>>
+    : std::true_type {};
+
+TEST(IsHashableTest, ValidHash) {
+  EXPECT_TRUE((is_hashable<int>::value));
+  EXPECT_TRUE(std::is_default_constructible<absl::Hash<int>>::value);
+  EXPECT_TRUE(std::is_copy_constructible<absl::Hash<int>>::value);
+  EXPECT_TRUE(std::is_move_constructible<absl::Hash<int>>::value);
+  EXPECT_TRUE(absl::is_copy_assignable<absl::Hash<int>>::value);
+  EXPECT_TRUE(absl::is_move_assignable<absl::Hash<int>>::value);
+  EXPECT_TRUE(IsHashCallble<int>::value);
+  EXPECT_TRUE(IsAggregateInitializable<absl::Hash<int>>::value);
+}
+#if ABSL_HASH_INTERNAL_CAN_POISON_ && !defined(__APPLE__)
+TEST(IsHashableTest, PoisonHash) {
+  struct X {};
+  EXPECT_FALSE((is_hashable<X>::value));
+  EXPECT_FALSE(std::is_default_constructible<absl::Hash<X>>::value);
+  EXPECT_FALSE(std::is_copy_constructible<absl::Hash<X>>::value);
+  EXPECT_FALSE(std::is_move_constructible<absl::Hash<X>>::value);
+  EXPECT_FALSE(absl::is_copy_assignable<absl::Hash<X>>::value);
+  EXPECT_FALSE(absl::is_move_assignable<absl::Hash<X>>::value);
+  EXPECT_FALSE(IsHashCallble<X>::value);
+  EXPECT_FALSE(IsAggregateInitializable<absl::Hash<X>>::value);
+}
+#endif  // ABSL_HASH_INTERNAL_CAN_POISON_
+
+// Hashable types
+//
+// These types exist simply to exercise various AbslHashValue behaviors, so
+// they are named by what their AbslHashValue overload does.
+struct NoOp {
+  template <typename HashCode>
+  friend HashCode AbslHashValue(HashCode h, NoOp n) {
+    return std::move(h);
+  }
+};
+
+struct EmptyCombine {
+  template <typename HashCode>
+  friend HashCode AbslHashValue(HashCode h, EmptyCombine e) {
+    return HashCode::combine(std::move(h));
+  }
+};
+
+template <typename Int>
+struct CombineIterative {
+  template <typename HashCode>
+  friend HashCode AbslHashValue(HashCode h, CombineIterative c) {
+    for (int i = 0; i < 5; ++i) {
+      h = HashCode::combine(std::move(h), Int(i));
+    }
+    return h;
+  }
+};
+
+template <typename Int>
+struct CombineVariadic {
+  template <typename HashCode>
+  friend HashCode AbslHashValue(HashCode h, CombineVariadic c) {
+    return HashCode::combine(std::move(h), Int(0), Int(1), Int(2), Int(3),
+                             Int(4));
+  }
+};
+
+using InvokeTag = absl::hash_internal::InvokeHashTag;
+template <InvokeTag T>
+using InvokeTagConstant = std::integral_constant<InvokeTag, T>;
+
+template <InvokeTag... Tags>
+struct MinTag;
+
+template <InvokeTag a, InvokeTag b, InvokeTag... Tags>
+struct MinTag<a, b, Tags...> : MinTag<(a < b ? a : b), Tags...> {};
+
+template <InvokeTag a>
+struct MinTag<a> : InvokeTagConstant<a> {};
+
+template <InvokeTag... Tags>
+struct CustomHashType {
+  size_t value;
+};
+
+template <InvokeTag allowed, InvokeTag... tags>
+struct EnableIfContained
+    : std::enable_if<absl::disjunction<
+          std::integral_constant<bool, allowed == tags>...>::value> {};
+
+template <
+    typename H, InvokeTag... Tags,
+    typename = typename EnableIfContained<InvokeTag::kHashValue, Tags...>::type>
+H AbslHashValue(H state, CustomHashType<Tags...> t) {
+  static_assert(MinTag<Tags...>::value == InvokeTag::kHashValue, "");
+  return H::combine(std::move(state),
+                    t.value + static_cast<int>(InvokeTag::kHashValue));
+}
+
+}  // namespace
+
+namespace absl {
+namespace hash_internal {
+template <InvokeTag... Tags>
+struct is_uniquely_represented<
+    CustomHashType<Tags...>,
+    typename EnableIfContained<InvokeTag::kUniquelyRepresented, Tags...>::type>
+    : std::true_type {};
+}  // namespace hash_internal
+}  // namespace absl
+
+#if ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+namespace ABSL_INTERNAL_LEGACY_HASH_NAMESPACE {
+template <InvokeTag... Tags>
+struct hash<CustomHashType<Tags...>> {
+  template <InvokeTag... TagsIn, typename = typename EnableIfContained<
+                                     InvokeTag::kLegacyHash, TagsIn...>::type>
+  size_t operator()(CustomHashType<TagsIn...> t) const {
+    static_assert(MinTag<Tags...>::value == InvokeTag::kLegacyHash, "");
+    return t.value + static_cast<int>(InvokeTag::kLegacyHash);
+  }
+};
+}  // namespace ABSL_INTERNAL_LEGACY_HASH_NAMESPACE
+#endif  // ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+
+namespace std {
+template <InvokeTag... Tags>  // NOLINT
+struct hash<CustomHashType<Tags...>> {
+  template <InvokeTag... TagsIn, typename = typename EnableIfContained<
+                                     InvokeTag::kStdHash, TagsIn...>::type>
+  size_t operator()(CustomHashType<TagsIn...> t) const {
+    static_assert(MinTag<Tags...>::value == InvokeTag::kStdHash, "");
+    return t.value + static_cast<int>(InvokeTag::kStdHash);
+  }
+};
+}  // namespace std
+
+namespace {
+
+template <typename... T>
+void TestCustomHashType(InvokeTagConstant<InvokeTag::kNone>, T...) {
+  using type = CustomHashType<T::value...>;
+  SCOPED_TRACE(testing::PrintToString(std::vector<InvokeTag>{T::value...}));
+  EXPECT_TRUE(is_hashable<type>());
+  EXPECT_TRUE(is_hashable<const type>());
+  EXPECT_TRUE(is_hashable<const type&>());
+
+  const size_t offset = static_cast<int>(std::min({T::value...}));
+  EXPECT_EQ(SpyHash(type{7}), SpyHash(size_t{7 + offset}));
+}
+
+void TestCustomHashType(InvokeTagConstant<InvokeTag::kNone>) {
+#if ABSL_HASH_INTERNAL_CAN_POISON_
+  // is_hashable is false if we don't support any of the hooks.
+  using type = CustomHashType<>;
+  EXPECT_FALSE(is_hashable<type>());
+  EXPECT_FALSE(is_hashable<const type>());
+  EXPECT_FALSE(is_hashable<const type&>());
+#endif  // ABSL_HASH_INTERNAL_CAN_POISON_
+}
+
+template <InvokeTag Tag, typename... T>
+void TestCustomHashType(InvokeTagConstant<Tag> tag, T... t) {
+  constexpr auto next = static_cast<InvokeTag>(static_cast<int>(Tag) + 1);
+  TestCustomHashType(InvokeTagConstant<next>(), tag, t...);
+  TestCustomHashType(InvokeTagConstant<next>(), t...);
+}
+
+TEST(HashTest, CustomHashType) {
+  TestCustomHashType(InvokeTagConstant<InvokeTag{}>());
+}
+
+TEST(HashTest, NoOpsAreEquivalent) {
+  EXPECT_EQ(Hash<NoOp>()({}), Hash<NoOp>()({}));
+  EXPECT_EQ(Hash<NoOp>()({}), Hash<EmptyCombine>()({}));
+}
+
+template <typename T>
+class HashIntTest : public testing::Test {
+};
+TYPED_TEST_CASE_P(HashIntTest);
+
+TYPED_TEST_P(HashIntTest, BasicUsage) {
+  EXPECT_NE(Hash<NoOp>()({}), Hash<TypeParam>()(0));
+  EXPECT_NE(Hash<NoOp>()({}),
+            Hash<TypeParam>()(std::numeric_limits<TypeParam>::max()));
+  if (std::numeric_limits<TypeParam>::min() != 0) {
+    EXPECT_NE(Hash<NoOp>()({}),
+              Hash<TypeParam>()(std::numeric_limits<TypeParam>::min()));
+  }
+
+  EXPECT_EQ(Hash<CombineIterative<TypeParam>>()({}),
+            Hash<CombineVariadic<TypeParam>>()({}));
+}
+
+REGISTER_TYPED_TEST_CASE_P(HashIntTest, BasicUsage);
+using IntTypes = testing::Types<unsigned char, char, int, int32_t, int64_t, uint32_t,
+                                uint64_t, size_t>;
+INSTANTIATE_TYPED_TEST_CASE_P(My, HashIntTest, IntTypes);
+
+struct StructWithPadding {
+  char c;
+  int i;
+
+  template <typename H>
+  friend H AbslHashValue(H hash_state, const StructWithPadding& s) {
+    return H::combine(std::move(hash_state), s.c, s.i);
+  }
+};
+
+static_assert(sizeof(StructWithPadding) > sizeof(char) + sizeof(int),
+              "StructWithPadding doesn't have padding");
+static_assert(std::is_standard_layout<StructWithPadding>::value, "");
+
+// This check has to be disabled because libstdc++ doesn't support it.
+// static_assert(std::is_trivially_constructible<StructWithPadding>::value, "");
+
+template <typename T>
+struct ArraySlice {
+  T* begin;
+  T* end;
+
+  template <typename H>
+  friend H AbslHashValue(H hash_state, const ArraySlice& slice) {
+    for (auto t = slice.begin; t != slice.end; ++t) {
+      hash_state = H::combine(std::move(hash_state), *t);
+    }
+    return hash_state;
+  }
+};
+
+TEST(HashTest, HashNonUniquelyRepresentedType) {
+  // Create equal StructWithPadding objects that are known to have non-equal
+  // padding bytes.
+  static const size_t kNumStructs = 10;
+  unsigned char buffer1[kNumStructs * sizeof(StructWithPadding)];
+  std::memset(buffer1, 0, sizeof(buffer1));
+  auto* s1 = reinterpret_cast<StructWithPadding*>(buffer1);
+
+  unsigned char buffer2[kNumStructs * sizeof(StructWithPadding)];
+  std::memset(buffer2, 255, sizeof(buffer2));
+  auto* s2 = reinterpret_cast<StructWithPadding*>(buffer2);
+  for (int i = 0; i < kNumStructs; ++i) {
+    SCOPED_TRACE(i);
+    s1[i].c = s2[i].c = '0' + i;
+    s1[i].i = s2[i].i = i;
+    ASSERT_FALSE(memcmp(buffer1 + i * sizeof(StructWithPadding),
+                        buffer2 + i * sizeof(StructWithPadding),
+                        sizeof(StructWithPadding)) == 0)
+        << "Bug in test code: objects do not have unequal"
+        << " object representations";
+  }
+
+  EXPECT_EQ(Hash<StructWithPadding>()(s1[0]), Hash<StructWithPadding>()(s2[0]));
+  EXPECT_EQ(Hash<ArraySlice<StructWithPadding>>()({s1, s1 + kNumStructs}),
+            Hash<ArraySlice<StructWithPadding>>()({s2, s2 + kNumStructs}));
+}
+
+TEST(HashTest, StandardHashContainerUsage) {
+  std::unordered_map<int, std::string, Hash<int>> map = {{0, "foo"}, { 42, "bar" }};
+
+  EXPECT_NE(map.find(0), map.end());
+  EXPECT_EQ(map.find(1), map.end());
+  EXPECT_NE(map.find(0u), map.end());
+}
+
+struct ConvertibleFromNoOp {
+  ConvertibleFromNoOp(NoOp) {}  // NOLINT(runtime/explicit)
+
+  template <typename H>
+  friend H AbslHashValue(H hash_state, ConvertibleFromNoOp) {
+    return H::combine(std::move(hash_state), 1);
+  }
+};
+
+TEST(HashTest, HeterogeneousCall) {
+  EXPECT_NE(Hash<ConvertibleFromNoOp>()(NoOp()),
+            Hash<NoOp>()(NoOp()));
+}
+
+TEST(IsUniquelyRepresentedTest, SanityTest) {
+  using absl::hash_internal::is_uniquely_represented;
+
+  EXPECT_TRUE(is_uniquely_represented<unsigned char>::value);
+  EXPECT_TRUE(is_uniquely_represented<int>::value);
+  EXPECT_FALSE(is_uniquely_represented<bool>::value);
+  EXPECT_FALSE(is_uniquely_represented<int*>::value);
+}
+
+struct IntAndString {
+  int i;
+  std::string s;
+
+  template <typename H>
+  friend H AbslHashValue(H hash_state, IntAndString int_and_string) {
+    return H::combine(std::move(hash_state), int_and_string.s,
+                      int_and_string.i);
+  }
+};
+
+TEST(HashTest, SmallValueOn64ByteBoundary) {
+  Hash<IntAndString>()(IntAndString{0, std::string(63, '0')});
+}
+
+struct TypeErased {
+  size_t n;
+
+  template <typename H>
+  friend H AbslHashValue(H hash_state, const TypeErased& v) {
+    v.HashValue(absl::HashState::Create(&hash_state));
+    return hash_state;
+  }
+
+  void HashValue(absl::HashState state) const {
+    absl::HashState::combine(std::move(state), n);
+  }
+};
+
+TEST(HashTest, TypeErased) {
+  EXPECT_TRUE((is_hashable<TypeErased>::value));
+  EXPECT_TRUE((is_hashable<std::pair<TypeErased, int>>::value));
+
+  EXPECT_EQ(SpyHash(TypeErased{7}), SpyHash(size_t{7}));
+  EXPECT_NE(SpyHash(TypeErased{7}), SpyHash(size_t{13}));
+
+  EXPECT_EQ(SpyHash(std::make_pair(TypeErased{7}, 17)),
+            SpyHash(std::make_pair(size_t{7}, 17)));
+}
+
+}  // namespace
diff --git a/absl/hash/hash_testing.h b/absl/hash/hash_testing.h
new file mode 100644
index 0000000..1e3cda6
--- /dev/null
+++ b/absl/hash/hash_testing.h
@@ -0,0 +1,372 @@
+// Copyright 2018 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
+//
+//      http://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_HASH_HASH_TESTING_H_
+#define ABSL_HASH_HASH_TESTING_H_
+
+#include <initializer_list>
+#include <tuple>
+#include <type_traits>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/hash/internal/spy_hash_state.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/str_cat.h"
+#include "absl/types/variant.h"
+
+namespace absl {
+
+// Run the absl::Hash algorithm over all the elements passed in and verify that
+// their hash expansion is congruent with their `==` operator.
+//
+// It is used in conjunction with EXPECT_TRUE. Failures will output information
+// on what requirement failed and on which objects.
+//
+// Users should pass a collection of types as either an initializer list or a
+// container of cases.
+//
+//   EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+//       {v1, v2, ..., vN}));
+//
+//   std::vector<MyType> cases;
+//   // Fill cases...
+//   EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(cases));
+//
+// Users can pass a variety of types for testing heterogeneous lookup with
+// `std::make_tuple`:
+//
+//   EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+//       std::make_tuple(v1, v2, ..., vN)));
+//
+//
+// Ideally, the values passed should provide enough coverage of the `==`
+// operator and the AbslHashValue implementations.
+// For dynamically sized types, the empty state should usually be included in
+// the values.
+//
+// The function accepts an optional comparator function, in case that `==` is
+// not enough for the values provided.
+//
+// Usage:
+//
+//   EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly(
+//       std::make_tuple(v1, v2, ..., vN), MyCustomEq{}));
+//
+// It checks the following requirements:
+//   1. The expansion for a value is deterministic.
+//   2. For any two objects `a` and `b` in the sequence, if `a == b` evaluates
+//      to true, then their hash expansion must be equal.
+//   3. If `a == b` evaluates to false their hash expansion must be unequal.
+//   4. If `a == b` evaluates to false neither hash expansion can be a
+//      suffix of the other.
+//   5. AbslHashValue overloads should not be called by the user. They are only
+//      meant to be called by the framework. Users should call H::combine() and
+//      H::combine_contiguous().
+//   6. No moved-from instance of the hash state is used in the implementation
+//      of AbslHashValue.
+//
+// The values do not have to have the same type. This can be useful for
+// equivalent types that support heterogeneous lookup.
+//
+// A possible reason for breaking (2) is combining state in the hash expansion
+// that was not used in `==`.
+// For example:
+//
+// struct Bad2 {
+//   int a, b;
+//   template <typename H>
+//   friend H AbslHashValue(H state, Bad2 x) {
+//     // Uses a and b.
+//     return H::combine(x.a, x.b);
+//   }
+//   friend bool operator==(Bad2 x, Bad2 y) {
+//     // Only uses a.
+//     return x.a == y.a;
+//   }
+// };
+//
+// As for (3), breaking this usually means that there is state being passed to
+// the `==` operator that is not used in the hash expansion.
+// For example:
+//
+// struct Bad3 {
+//   int a, b;
+//   template <typename H>
+//   friend H AbslHashValue(H state, Bad3 x) {
+//     // Only uses a.
+//     return H::combine(x.a);
+//   }
+//   friend bool operator==(Bad3 x, Bad3 y) {
+//     // Uses a and b.
+//     return x.a == y.a && x.b == y.b;
+//   }
+// };
+//
+// Finally, a common way to break 4 is by combining dynamic ranges without
+// combining the size of the range.
+// For example:
+//
+// struct Bad4 {
+//   int *p, size;
+//   template <typename H>
+//   friend H AbslHashValue(H state, Bad4 x) {
+//     return H::combine_range(x.p, x.p + x.size);
+//   }
+//   friend bool operator==(Bad4 x, Bad4 y) {
+//     return std::equal(x.p, x.p + x.size, y.p, y.p + y.size);
+//   }
+// };
+//
+// An easy solution to this is to combine the size after combining the range,
+// like so:
+//   template <typename H>
+//   friend H AbslHashValue(H state, Bad4 x) {
+//     return H::combine(H::combine_range(x.p, x.p + x.size), x.size);
+//   }
+//
+template <int&... ExplicitBarrier, typename Container>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(const Container& values);
+
+template <int&... ExplicitBarrier, typename Container, typename Eq>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(const Container& values, Eq equals);
+
+template <int&..., typename T>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(std::initializer_list<T> values);
+
+template <int&..., typename T, typename Eq>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(std::initializer_list<T> values,
+                                      Eq equals);
+
+namespace hash_internal {
+
+struct PrintVisitor {
+  size_t index;
+  template <typename T>
+  std::string operator()(const T* value) const {
+    return absl::StrCat("#", index, "(", testing::PrintToString(*value), ")");
+  }
+};
+
+template <typename Eq>
+struct EqVisitor {
+  Eq eq;
+  template <typename T, typename U>
+  bool operator()(const T* t, const U* u) const {
+    return eq(*t, *u);
+  }
+};
+
+struct ExpandVisitor {
+  template <typename T>
+  SpyHashState operator()(const T* value) const {
+    return SpyHashState::combine(SpyHashState(), *value);
+  }
+};
+
+template <typename Container, typename Eq>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(const Container& values, Eq equals) {
+  using V = typename Container::value_type;
+
+  struct Info {
+    const V& value;
+    size_t index;
+    std::string ToString() const { return absl::visit(PrintVisitor{index}, value); }
+    SpyHashState expand() const { return absl::visit(ExpandVisitor{}, value); }
+  };
+
+  using EqClass = std::vector<Info>;
+  std::vector<EqClass> classes;
+
+  // Gather the values in equivalence classes.
+  size_t i = 0;
+  for (const auto& value : values) {
+    EqClass* c = nullptr;
+    for (auto& eqclass : classes) {
+      if (absl::visit(EqVisitor<Eq>{equals}, value, eqclass[0].value)) {
+        c = &eqclass;
+        break;
+      }
+    }
+    if (c == nullptr) {
+      classes.emplace_back();
+      c = &classes.back();
+    }
+    c->push_back({value, i});
+    ++i;
+
+    // Verify potential errors captured by SpyHashState.
+    if (auto error = c->back().expand().error()) {
+      return testing::AssertionFailure() << *error;
+    }
+  }
+
+  if (classes.size() < 2) {
+    return testing::AssertionFailure()
+           << "At least two equivalence classes are expected.";
+  }
+
+  // We assume that equality is correctly implemented.
+  // Now we verify that AbslHashValue is also correctly implemented.
+
+  for (const auto& c : classes) {
+    // All elements of the equivalence class must have the same hash expansion.
+    const SpyHashState expected = c[0].expand();
+    for (const Info& v : c) {
+      if (v.expand() != v.expand()) {
+        return testing::AssertionFailure()
+               << "Hash expansion for " << v.ToString()
+               << " is non-deterministic.";
+      }
+      if (v.expand() != expected) {
+        return testing::AssertionFailure()
+               << "Values " << c[0].ToString() << " and " << v.ToString()
+               << " evaluate as equal but have an unequal hash expansion.";
+      }
+    }
+
+    // Elements from other classes must have different hash expansion.
+    for (const auto& c2 : classes) {
+      if (&c == &c2) continue;
+      const SpyHashState c2_hash = c2[0].expand();
+      switch (SpyHashState::Compare(expected, c2_hash)) {
+        case SpyHashState::CompareResult::kEqual:
+          return testing::AssertionFailure()
+                 << "Values " << c[0].ToString() << " and " << c2[0].ToString()
+                 << " evaluate as unequal but have an equal hash expansion.";
+        case SpyHashState::CompareResult::kBSuffixA:
+          return testing::AssertionFailure()
+                 << "Hash expansion of " << c2[0].ToString()
+                 << " is a suffix of the hash expansion of " << c[0].ToString()
+                 << ".";
+        case SpyHashState::CompareResult::kASuffixB:
+          return testing::AssertionFailure()
+                 << "Hash expansion of " << c[0].ToString()
+                 << " is a suffix of the hash expansion of " << c2[0].ToString()
+                 << ".";
+        case SpyHashState::CompareResult::kUnequal:
+          break;
+      }
+    }
+  }
+  return testing::AssertionSuccess();
+}
+
+template <typename... T>
+struct TypeSet {
+  template <typename U, bool = disjunction<std::is_same<T, U>...>::value>
+  struct Insert {
+    using type = TypeSet<U, T...>;
+  };
+  template <typename U>
+  struct Insert<U, true> {
+    using type = TypeSet;
+  };
+
+  template <template <typename...> class C>
+  using apply = C<T...>;
+};
+
+template <typename... T>
+struct MakeTypeSet : TypeSet<>{};
+template <typename T, typename... Ts>
+struct MakeTypeSet<T, Ts...> : MakeTypeSet<Ts...>::template Insert<T>::type {};
+
+template <typename... T>
+using VariantForTypes = typename MakeTypeSet<
+    const typename std::decay<T>::type*...>::template apply<absl::variant>;
+
+template <typename Container>
+struct ContainerAsVector {
+  using V = absl::variant<const typename Container::value_type*>;
+  using Out = std::vector<V>;
+
+  static Out Do(const Container& values) {
+    Out out;
+    for (const auto& v : values) out.push_back(&v);
+    return out;
+  }
+};
+
+template <typename... T>
+struct ContainerAsVector<std::tuple<T...>> {
+  using V = VariantForTypes<T...>;
+  using Out = std::vector<V>;
+
+  template <size_t... I>
+  static Out DoImpl(const std::tuple<T...>& tuple, absl::index_sequence<I...>) {
+    return Out{&std::get<I>(tuple)...};
+  }
+
+  static Out Do(const std::tuple<T...>& values) {
+    return DoImpl(values, absl::index_sequence_for<T...>());
+  }
+};
+
+template <>
+struct ContainerAsVector<std::tuple<>> {
+  static std::vector<VariantForTypes<int>> Do(std::tuple<>) { return {}; }
+};
+
+struct DefaultEquals {
+  template <typename T, typename U>
+  bool operator()(const T& t, const U& u) const {
+    return t == u;
+  }
+};
+
+}  // namespace hash_internal
+
+template <int&..., typename Container>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(const Container& values) {
+  return hash_internal::VerifyTypeImplementsAbslHashCorrectly(
+      hash_internal::ContainerAsVector<Container>::Do(values),
+      hash_internal::DefaultEquals{});
+}
+
+template <int&..., typename Container, typename Eq>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(const Container& values, Eq equals) {
+  return hash_internal::VerifyTypeImplementsAbslHashCorrectly(
+      hash_internal::ContainerAsVector<Container>::Do(values),
+      equals);
+}
+
+template <int&..., typename T>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(std::initializer_list<T> values) {
+  return hash_internal::VerifyTypeImplementsAbslHashCorrectly(
+      hash_internal::ContainerAsVector<std::initializer_list<T>>::Do(values),
+      hash_internal::DefaultEquals{});
+}
+
+template <int&..., typename T, typename Eq>
+ABSL_MUST_USE_RESULT testing::AssertionResult
+VerifyTypeImplementsAbslHashCorrectly(std::initializer_list<T> values,
+                                      Eq equals) {
+  return hash_internal::VerifyTypeImplementsAbslHashCorrectly(
+      hash_internal::ContainerAsVector<std::initializer_list<T>>::Do(values),
+      equals);
+}
+
+}  // namespace absl
+
+#endif  // ABSL_HASH_HASH_TESTING_H_
diff --git a/absl/hash/internal/city.cc b/absl/hash/internal/city.cc
new file mode 100644
index 0000000..591017a
--- /dev/null
+++ b/absl/hash/internal/city.cc
@@ -0,0 +1,589 @@
+// Copyright 2018 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
+//
+//      http://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.
+//
+// This file provides CityHash64() and related functions.
+//
+// It's probably possible to create even faster hash functions by
+// writing a program that systematically explores some of the space of
+// possible hash functions, by using SIMD instructions, or by
+// compromising on hash quality.
+
+#include "absl/hash/internal/city.h"
+
+#include <string.h>  // for memcpy and memset
+#include <algorithm>
+
+#include "absl/base/config.h"
+#include "absl/base/internal/endian.h"
+#include "absl/base/internal/unaligned_access.h"
+#include "absl/base/optimization.h"
+
+namespace absl {
+namespace hash_internal {
+
+#ifdef ABSL_IS_BIG_ENDIAN
+#define uint32_in_expected_order(x) (absl::gbswap_32(x))
+#define uint64_in_expected_order(x) (absl::gbswap_64(x))
+#else
+#define uint32_in_expected_order(x) (x)
+#define uint64_in_expected_order(x) (x)
+#endif
+
+static uint64_t Fetch64(const char *p) {
+  return uint64_in_expected_order(ABSL_INTERNAL_UNALIGNED_LOAD64(p));
+}
+
+static uint32_t Fetch32(const char *p) {
+  return uint32_in_expected_order(ABSL_INTERNAL_UNALIGNED_LOAD32(p));
+}
+
+// Some primes between 2^63 and 2^64 for various uses.
+static const uint64_t k0 = 0xc3a5c85c97cb3127ULL;
+static const uint64_t k1 = 0xb492b66fbe98f273ULL;
+static const uint64_t k2 = 0x9ae16a3b2f90404fULL;
+
+// Magic numbers for 32-bit hashing.  Copied from Murmur3.
+static const uint32_t c1 = 0xcc9e2d51;
+static const uint32_t c2 = 0x1b873593;
+
+// A 32-bit to 32-bit integer hash copied from Murmur3.
+static uint32_t fmix(uint32_t h) {
+  h ^= h >> 16;
+  h *= 0x85ebca6b;
+  h ^= h >> 13;
+  h *= 0xc2b2ae35;
+  h ^= h >> 16;
+  return h;
+}
+
+static uint32_t Rotate32(uint32_t val, int shift) {
+  // Avoid shifting by 32: doing so yields an undefined result.
+  return shift == 0 ? val : ((val >> shift) | (val << (32 - shift)));
+}
+
+#undef PERMUTE3
+#define PERMUTE3(a, b, c) \
+  do {                    \
+    std::swap(a, b);      \
+    std::swap(a, c);      \
+  } while (0)
+
+static uint32_t Mur(uint32_t a, uint32_t h) {
+  // Helper from Murmur3 for combining two 32-bit values.
+  a *= c1;
+  a = Rotate32(a, 17);
+  a *= c2;
+  h ^= a;
+  h = Rotate32(h, 19);
+  return h * 5 + 0xe6546b64;
+}
+
+static uint32_t Hash32Len13to24(const char *s, size_t len) {
+  uint32_t a = Fetch32(s - 4 + (len >> 1));
+  uint32_t b = Fetch32(s + 4);
+  uint32_t c = Fetch32(s + len - 8);
+  uint32_t d = Fetch32(s + (len >> 1));
+  uint32_t e = Fetch32(s);
+  uint32_t f = Fetch32(s + len - 4);
+  uint32_t h = len;
+
+  return fmix(Mur(f, Mur(e, Mur(d, Mur(c, Mur(b, Mur(a, h)))))));
+}
+
+static uint32_t Hash32Len0to4(const char *s, size_t len) {
+  uint32_t b = 0;
+  uint32_t c = 9;
+  for (size_t i = 0; i < len; i++) {
+    signed char v = s[i];
+    b = b * c1 + v;
+    c ^= b;
+  }
+  return fmix(Mur(b, Mur(len, c)));
+}
+
+static uint32_t Hash32Len5to12(const char *s, size_t len) {
+  uint32_t a = len, b = len * 5, c = 9, d = b;
+  a += Fetch32(s);
+  b += Fetch32(s + len - 4);
+  c += Fetch32(s + ((len >> 1) & 4));
+  return fmix(Mur(c, Mur(b, Mur(a, d))));
+}
+
+uint32_t CityHash32(const char *s, size_t len) {
+  if (len <= 24) {
+    return len <= 12
+               ? (len <= 4 ? Hash32Len0to4(s, len) : Hash32Len5to12(s, len))
+               : Hash32Len13to24(s, len);
+  }
+
+  // len > 24
+  uint32_t h = len, g = c1 * len, f = g;
+  uint32_t a0 = Rotate32(Fetch32(s + len - 4) * c1, 17) * c2;
+  uint32_t a1 = Rotate32(Fetch32(s + len - 8) * c1, 17) * c2;
+  uint32_t a2 = Rotate32(Fetch32(s + len - 16) * c1, 17) * c2;
+  uint32_t a3 = Rotate32(Fetch32(s + len - 12) * c1, 17) * c2;
+  uint32_t a4 = Rotate32(Fetch32(s + len - 20) * c1, 17) * c2;
+  h ^= a0;
+  h = Rotate32(h, 19);
+  h = h * 5 + 0xe6546b64;
+  h ^= a2;
+  h = Rotate32(h, 19);
+  h = h * 5 + 0xe6546b64;
+  g ^= a1;
+  g = Rotate32(g, 19);
+  g = g * 5 + 0xe6546b64;
+  g ^= a3;
+  g = Rotate32(g, 19);
+  g = g * 5 + 0xe6546b64;
+  f += a4;
+  f = Rotate32(f, 19);
+  f = f * 5 + 0xe6546b64;
+  size_t iters = (len - 1) / 20;
+  do {
+    uint32_t a0 = Rotate32(Fetch32(s) * c1, 17) * c2;
+    uint32_t a1 = Fetch32(s + 4);
+    uint32_t a2 = Rotate32(Fetch32(s + 8) * c1, 17) * c2;
+    uint32_t a3 = Rotate32(Fetch32(s + 12) * c1, 17) * c2;
+    uint32_t a4 = Fetch32(s + 16);
+    h ^= a0;
+    h = Rotate32(h, 18);
+    h = h * 5 + 0xe6546b64;
+    f += a1;
+    f = Rotate32(f, 19);
+    f = f * c1;
+    g += a2;
+    g = Rotate32(g, 18);
+    g = g * 5 + 0xe6546b64;
+    h ^= a3 + a1;
+    h = Rotate32(h, 19);
+    h = h * 5 + 0xe6546b64;
+    g ^= a4;
+    g = absl::gbswap_32(g) * 5;
+    h += a4 * 5;
+    h = absl::gbswap_32(h);
+    f += a0;
+    PERMUTE3(f, h, g);
+    s += 20;
+  } while (--iters != 0);
+  g = Rotate32(g, 11) * c1;
+  g = Rotate32(g, 17) * c1;
+  f = Rotate32(f, 11) * c1;
+  f = Rotate32(f, 17) * c1;
+  h = Rotate32(h + g, 19);
+  h = h * 5 + 0xe6546b64;
+  h = Rotate32(h, 17) * c1;
+  h = Rotate32(h + f, 19);
+  h = h * 5 + 0xe6546b64;
+  h = Rotate32(h, 17) * c1;
+  return h;
+}
+
+// Bitwise right rotate.  Normally this will compile to a single
+// instruction, especially if the shift is a manifest constant.
+static uint64_t Rotate(uint64_t val, int shift) {
+  // Avoid shifting by 64: doing so yields an undefined result.
+  return shift == 0 ? val : ((val >> shift) | (val << (64 - shift)));
+}
+
+static uint64_t ShiftMix(uint64_t val) { return val ^ (val >> 47); }
+
+static uint64_t HashLen16(uint64_t u, uint64_t v) {
+  return Hash128to64(uint128(u, v));
+}
+
+static uint64_t HashLen16(uint64_t u, uint64_t v, uint64_t mul) {
+  // Murmur-inspired hashing.
+  uint64_t a = (u ^ v) * mul;
+  a ^= (a >> 47);
+  uint64_t b = (v ^ a) * mul;
+  b ^= (b >> 47);
+  b *= mul;
+  return b;
+}
+
+static uint64_t HashLen0to16(const char *s, size_t len) {
+  if (len >= 8) {
+    uint64_t mul = k2 + len * 2;
+    uint64_t a = Fetch64(s) + k2;
+    uint64_t b = Fetch64(s + len - 8);
+    uint64_t c = Rotate(b, 37) * mul + a;
+    uint64_t d = (Rotate(a, 25) + b) * mul;
+    return HashLen16(c, d, mul);
+  }
+  if (len >= 4) {
+    uint64_t mul = k2 + len * 2;
+    uint64_t a = Fetch32(s);
+    return HashLen16(len + (a << 3), Fetch32(s + len - 4), mul);
+  }
+  if (len > 0) {
+    uint8_t a = s[0];
+    uint8_t b = s[len >> 1];
+    uint8_t c = s[len - 1];
+    uint32_t y = static_cast<uint32_t>(a) + (static_cast<uint32_t>(b) << 8);
+    uint32_t z = len + (static_cast<uint32_t>(c) << 2);
+    return ShiftMix(y * k2 ^ z * k0) * k2;
+  }
+  return k2;
+}
+
+// This probably works well for 16-byte strings as well, but it may be overkill
+// in that case.
+static uint64_t HashLen17to32(const char *s, size_t len) {
+  uint64_t mul = k2 + len * 2;
+  uint64_t a = Fetch64(s) * k1;
+  uint64_t b = Fetch64(s + 8);
+  uint64_t c = Fetch64(s + len - 8) * mul;
+  uint64_t d = Fetch64(s + len - 16) * k2;
+  return HashLen16(Rotate(a + b, 43) + Rotate(c, 30) + d,
+                   a + Rotate(b + k2, 18) + c, mul);
+}
+
+// Return a 16-byte hash for 48 bytes.  Quick and dirty.
+// Callers do best to use "random-looking" values for a and b.
+static std::pair<uint64_t, uint64_t> WeakHashLen32WithSeeds(uint64_t w, uint64_t x,
+                                                        uint64_t y, uint64_t z,
+                                                        uint64_t a, uint64_t b) {
+  a += w;
+  b = Rotate(b + a + z, 21);
+  uint64_t c = a;
+  a += x;
+  a += y;
+  b += Rotate(a, 44);
+  return std::make_pair(a + z, b + c);
+}
+
+// Return a 16-byte hash for s[0] ... s[31], a, and b.  Quick and dirty.
+static std::pair<uint64_t, uint64_t> WeakHashLen32WithSeeds(const char *s, uint64_t a,
+                                                        uint64_t b) {
+  return WeakHashLen32WithSeeds(Fetch64(s), Fetch64(s + 8), Fetch64(s + 16),
+                                Fetch64(s + 24), a, b);
+}
+
+// Return an 8-byte hash for 33 to 64 bytes.
+static uint64_t HashLen33to64(const char *s, size_t len) {
+  uint64_t mul = k2 + len * 2;
+  uint64_t a = Fetch64(s) * k2;
+  uint64_t b = Fetch64(s + 8);
+  uint64_t c = Fetch64(s + len - 24);
+  uint64_t d = Fetch64(s + len - 32);
+  uint64_t e = Fetch64(s + 16) * k2;
+  uint64_t f = Fetch64(s + 24) * 9;
+  uint64_t g = Fetch64(s + len - 8);
+  uint64_t h = Fetch64(s + len - 16) * mul;
+  uint64_t u = Rotate(a + g, 43) + (Rotate(b, 30) + c) * 9;
+  uint64_t v = ((a + g) ^ d) + f + 1;
+  uint64_t w = absl::gbswap_64((u + v) * mul) + h;
+  uint64_t x = Rotate(e + f, 42) + c;
+  uint64_t y = (absl::gbswap_64((v + w) * mul) + g) * mul;
+  uint64_t z = e + f + c;
+  a = absl::gbswap_64((x + z) * mul + y) + b;
+  b = ShiftMix((z + a) * mul + d + h) * mul;
+  return b + x;
+}
+
+uint64_t CityHash64(const char *s, size_t len) {
+  if (len <= 32) {
+    if (len <= 16) {
+      return HashLen0to16(s, len);
+    } else {
+      return HashLen17to32(s, len);
+    }
+  } else if (len <= 64) {
+    return HashLen33to64(s, len);
+  }
+
+  // For strings over 64 bytes we hash the end first, and then as we
+  // loop we keep 56 bytes of state: v, w, x, y, and z.
+  uint64_t x = Fetch64(s + len - 40);
+  uint64_t y = Fetch64(s + len - 16) + Fetch64(s + len - 56);
+  uint64_t z = HashLen16(Fetch64(s + len - 48) + len, Fetch64(s + len - 24));
+  std::pair<uint64_t, uint64_t> v = WeakHashLen32WithSeeds(s + len - 64, len, z);
+  std::pair<uint64_t, uint64_t> w = WeakHashLen32WithSeeds(s + len - 32, y + k1, x);
+  x = x * k1 + Fetch64(s);
+
+  // Decrease len to the nearest multiple of 64, and operate on 64-byte chunks.
+  len = (len - 1) & ~static_cast<size_t>(63);
+  do {
+    x = Rotate(x + y + v.first + Fetch64(s + 8), 37) * k1;
+    y = Rotate(y + v.second + Fetch64(s + 48), 42) * k1;
+    x ^= w.second;
+    y += v.first + Fetch64(s + 40);
+    z = Rotate(z + w.first, 33) * k1;
+    v = WeakHashLen32WithSeeds(s, v.second * k1, x + w.first);
+    w = WeakHashLen32WithSeeds(s + 32, z + w.second, y + Fetch64(s + 16));
+    std::swap(z, x);
+    s += 64;
+    len -= 64;
+  } while (len != 0);
+  return HashLen16(HashLen16(v.first, w.first) + ShiftMix(y) * k1 + z,
+                   HashLen16(v.second, w.second) + x);
+}
+
+uint64_t CityHash64WithSeed(const char *s, size_t len, uint64_t seed) {
+  return CityHash64WithSeeds(s, len, k2, seed);
+}
+
+uint64_t CityHash64WithSeeds(const char *s, size_t len, uint64_t seed0,
+                           uint64_t seed1) {
+  return HashLen16(CityHash64(s, len) - seed0, seed1);
+}
+
+// A subroutine for CityHash128().  Returns a decent 128-bit hash for strings
+// of any length representable in signed long.  Based on City and Murmur.
+static uint128 CityMurmur(const char *s, size_t len, uint128 seed) {
+  uint64_t a = Uint128Low64(seed);
+  uint64_t b = Uint128High64(seed);
+  uint64_t c = 0;
+  uint64_t d = 0;
+  int64_t l = len - 16;
+  if (l <= 0) {  // len <= 16
+    a = ShiftMix(a * k1) * k1;
+    c = b * k1 + HashLen0to16(s, len);
+    d = ShiftMix(a + (len >= 8 ? Fetch64(s) : c));
+  } else {  // len > 16
+    c = HashLen16(Fetch64(s + len - 8) + k1, a);
+    d = HashLen16(b + len, c + Fetch64(s + len - 16));
+    a += d;
+    do {
+      a ^= ShiftMix(Fetch64(s) * k1) * k1;
+      a *= k1;
+      b ^= a;
+      c ^= ShiftMix(Fetch64(s + 8) * k1) * k1;
+      c *= k1;
+      d ^= c;
+      s += 16;
+      l -= 16;
+    } while (l > 0);
+  }
+  a = HashLen16(a, c);
+  b = HashLen16(d, b);
+  return uint128(a ^ b, HashLen16(b, a));
+}
+
+uint128 CityHash128WithSeed(const char *s, size_t len, uint128 seed) {
+  if (len < 128) {
+    return CityMurmur(s, len, seed);
+  }
+
+  // We expect len >= 128 to be the common case.  Keep 56 bytes of state:
+  // v, w, x, y, and z.
+  std::pair<uint64_t, uint64_t> v, w;
+  uint64_t x = Uint128Low64(seed);
+  uint64_t y = Uint128High64(seed);
+  uint64_t z = len * k1;
+  v.first = Rotate(y ^ k1, 49) * k1 + Fetch64(s);
+  v.second = Rotate(v.first, 42) * k1 + Fetch64(s + 8);
+  w.first = Rotate(y + z, 35) * k1 + x;
+  w.second = Rotate(x + Fetch64(s + 88), 53) * k1;
+
+  // This is the same inner loop as CityHash64(), manually unrolled.
+  do {
+    x = Rotate(x + y + v.first + Fetch64(s + 8), 37) * k1;
+    y = Rotate(y + v.second + Fetch64(s + 48), 42) * k1;
+    x ^= w.second;
+    y += v.first + Fetch64(s + 40);
+    z = Rotate(z + w.first, 33) * k1;
+    v = WeakHashLen32WithSeeds(s, v.second * k1, x + w.first);
+    w = WeakHashLen32WithSeeds(s + 32, z + w.second, y + Fetch64(s + 16));
+    std::swap(z, x);
+    s += 64;
+    x = Rotate(x + y + v.first + Fetch64(s + 8), 37) * k1;
+    y = Rotate(y + v.second + Fetch64(s + 48), 42) * k1;
+    x ^= w.second;
+    y += v.first + Fetch64(s + 40);
+    z = Rotate(z + w.first, 33) * k1;
+    v = WeakHashLen32WithSeeds(s, v.second * k1, x + w.first);
+    w = WeakHashLen32WithSeeds(s + 32, z + w.second, y + Fetch64(s + 16));
+    std::swap(z, x);
+    s += 64;
+    len -= 128;
+  } while (ABSL_PREDICT_TRUE(len >= 128));
+  x += Rotate(v.first + z, 49) * k0;
+  y = y * k0 + Rotate(w.second, 37);
+  z = z * k0 + Rotate(w.first, 27);
+  w.first *= 9;
+  v.first *= k0;
+  // If 0 < len < 128, hash up to 4 chunks of 32 bytes each from the end of s.
+  for (size_t tail_done = 0; tail_done < len;) {
+    tail_done += 32;
+    y = Rotate(x + y, 42) * k0 + v.second;
+    w.first += Fetch64(s + len - tail_done + 16);
+    x = x * k0 + w.first;
+    z += w.second + Fetch64(s + len - tail_done);
+    w.second += v.first;
+    v = WeakHashLen32WithSeeds(s + len - tail_done, v.first + z, v.second);
+    v.first *= k0;
+  }
+  // At this point our 56 bytes of state should contain more than
+  // enough information for a strong 128-bit hash.  We use two
+  // different 56-byte-to-8-byte hashes to get a 16-byte final result.
+  x = HashLen16(x, v.first);
+  y = HashLen16(y + z, w.first);
+  return uint128(HashLen16(x + v.second, w.second) + y,
+                 HashLen16(x + w.second, y + v.second));
+}
+
+uint128 CityHash128(const char *s, size_t len) {
+  return len >= 16
+             ? CityHash128WithSeed(s + 16, len - 16,
+                                   uint128(Fetch64(s), Fetch64(s + 8) + k0))
+             : CityHash128WithSeed(s, len, uint128(k0, k1));
+}
+}  // namespace hash_internal
+}  // namespace absl
+
+#ifdef __SSE4_2__
+#include <nmmintrin.h>
+#include "absl/hash/internal/city_crc.h"
+
+namespace absl {
+namespace hash_internal {
+
+// Requires len >= 240.
+static void CityHashCrc256Long(const char *s, size_t len, uint32_t seed,
+                               uint64_t *result) {
+  uint64_t a = Fetch64(s + 56) + k0;
+  uint64_t b = Fetch64(s + 96) + k0;
+  uint64_t c = result[0] = HashLen16(b, len);
+  uint64_t d = result[1] = Fetch64(s + 120) * k0 + len;
+  uint64_t e = Fetch64(s + 184) + seed;
+  uint64_t f = 0;
+  uint64_t g = 0;
+  uint64_t h = c + d;
+  uint64_t x = seed;
+  uint64_t y = 0;
+  uint64_t z = 0;
+
+  // 240 bytes of input per iter.
+  size_t iters = len / 240;
+  len -= iters * 240;
+  do {
+#undef CHUNK
+#define CHUNK(r)               \
+  PERMUTE3(x, z, y);           \
+  b += Fetch64(s);             \
+  c += Fetch64(s + 8);         \
+  d += Fetch64(s + 16);        \
+  e += Fetch64(s + 24);        \
+  f += Fetch64(s + 32);        \
+  a += b;                      \
+  h += f;                      \
+  b += c;                      \
+  f += d;                      \
+  g += e;                      \
+  e += z;                      \
+  g += x;                      \
+  z = _mm_crc32_u64(z, b + g); \
+  y = _mm_crc32_u64(y, e + h); \
+  x = _mm_crc32_u64(x, f + a); \
+  e = Rotate(e, r);            \
+  c += e;                      \
+  s += 40
+
+    CHUNK(0);
+    PERMUTE3(a, h, c);
+    CHUNK(33);
+    PERMUTE3(a, h, f);
+    CHUNK(0);
+    PERMUTE3(b, h, f);
+    CHUNK(42);
+    PERMUTE3(b, h, d);
+    CHUNK(0);
+    PERMUTE3(b, h, e);
+    CHUNK(33);
+    PERMUTE3(a, h, e);
+  } while (--iters > 0);
+
+  while (len >= 40) {
+    CHUNK(29);
+    e ^= Rotate(a, 20);
+    h += Rotate(b, 30);
+    g ^= Rotate(c, 40);
+    f += Rotate(d, 34);
+    PERMUTE3(c, h, g);
+    len -= 40;
+  }
+  if (len > 0) {
+    s = s + len - 40;
+    CHUNK(33);
+    e ^= Rotate(a, 43);
+    h += Rotate(b, 42);
+    g ^= Rotate(c, 41);
+    f += Rotate(d, 40);
+  }
+  result[0] ^= h;
+  result[1] ^= g;
+  g += h;
+  a = HashLen16(a, g + z);
+  x += y << 32;
+  b += x;
+  c = HashLen16(c, z) + h;
+  d = HashLen16(d, e + result[0]);
+  g += e;
+  h += HashLen16(x, f);
+  e = HashLen16(a, d) + g;
+  z = HashLen16(b, c) + a;
+  y = HashLen16(g, h) + c;
+  result[0] = e + z + y + x;
+  a = ShiftMix((a + y) * k0) * k0 + b;
+  result[1] += a + result[0];
+  a = ShiftMix(a * k0) * k0 + c;
+  result[2] = a + result[1];
+  a = ShiftMix((a + e) * k0) * k0;
+  result[3] = a + result[2];
+}
+
+// Requires len < 240.
+static void CityHashCrc256Short(const char *s, size_t len, uint64_t *result) {
+  char buf[240];
+  memcpy(buf, s, len);
+  memset(buf + len, 0, 240 - len);
+  CityHashCrc256Long(buf, 240, ~static_cast<uint32_t>(len), result);
+}
+
+void CityHashCrc256(const char *s, size_t len, uint64_t *result) {
+  if (ABSL_PREDICT_TRUE(len >= 240)) {
+    CityHashCrc256Long(s, len, 0, result);
+  } else {
+    CityHashCrc256Short(s, len, result);
+  }
+}
+
+uint128 CityHashCrc128WithSeed(const char *s, size_t len, uint128 seed) {
+  if (len <= 900) {
+    return CityHash128WithSeed(s, len, seed);
+  } else {
+    uint64_t result[4];
+    CityHashCrc256(s, len, result);
+    uint64_t u = Uint128High64(seed) + result[0];
+    uint64_t v = Uint128Low64(seed) + result[1];
+    return uint128(HashLen16(u, v + result[2]),
+                   HashLen16(Rotate(v, 32), u * k0 + result[3]));
+  }
+}
+
+uint128 CityHashCrc128(const char *s, size_t len) {
+  if (len <= 900) {
+    return CityHash128(s, len);
+  } else {
+    uint64_t result[4];
+    CityHashCrc256(s, len, result);
+    return uint128(result[2], result[3]);
+  }
+}
+
+}  // namespace hash_internal
+}  // namespace absl
+
+#endif
diff --git a/absl/hash/internal/city.h b/absl/hash/internal/city.h
new file mode 100644
index 0000000..55b37b8
--- /dev/null
+++ b/absl/hash/internal/city.h
@@ -0,0 +1,108 @@
+// Copyright 2018 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
+//
+//      http://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.
+//
+// http://code.google.com/p/cityhash/
+//
+// This file provides a few functions for hashing strings.  All of them are
+// high-quality functions in the sense that they pass standard tests such
+// as Austin Appleby's SMHasher.  They are also fast.
+//
+// For 64-bit x86 code, on short strings, we don't know of anything faster than
+// CityHash64 that is of comparable quality.  We believe our nearest competitor
+// is Murmur3.  For 64-bit x86 code, CityHash64 is an excellent choice for hash
+// tables and most other hashing (excluding cryptography).
+//
+// For 64-bit x86 code, on long strings, the picture is more complicated.
+// On many recent Intel CPUs, such as Nehalem, Westmere, Sandy Bridge, etc.,
+// CityHashCrc128 appears to be faster than all competitors of comparable
+// quality.  CityHash128 is also good but not quite as fast.  We believe our
+// nearest competitor is Bob Jenkins' Spooky.  We don't have great data for
+// other 64-bit CPUs, but for long strings we know that Spooky is slightly
+// faster than CityHash on some relatively recent AMD x86-64 CPUs, for example.
+// Note that CityHashCrc128 is declared in citycrc.h.
+//
+// For 32-bit x86 code, we don't know of anything faster than CityHash32 that
+// is of comparable quality.  We believe our nearest competitor is Murmur3A.
+// (On 64-bit CPUs, it is typically faster to use the other CityHash variants.)
+//
+// Functions in the CityHash family are not suitable for cryptography.
+//
+// Please see CityHash's README file for more details on our performance
+// measurements and so on.
+//
+// WARNING: This code has been only lightly tested on big-endian platforms!
+// It is known to work well on little-endian platforms that have a small penalty
+// for unaligned reads, such as current Intel and AMD moderate-to-high-end CPUs.
+// It should work on all 32-bit and 64-bit platforms that allow unaligned reads;
+// bug reports are welcome.
+//
+// By the way, for some hash functions, given strings a and b, the hash
+// of a+b is easily derived from the hashes of a and b.  This property
+// doesn't hold for any hash functions in this file.
+
+#ifndef ABSL_HASH_INTERNAL_CITY_H_
+#define ABSL_HASH_INTERNAL_CITY_H_
+
+#include <stdint.h>
+#include <stdlib.h>  // for size_t.
+#include <utility>
+
+
+namespace absl {
+namespace hash_internal {
+
+typedef std::pair<uint64_t, uint64_t> uint128;
+
+inline uint64_t Uint128Low64(const uint128 &x) { return x.first; }
+inline uint64_t Uint128High64(const uint128 &x) { return x.second; }
+
+// Hash function for a byte array.
+uint64_t CityHash64(const char *s, size_t len);
+
+// Hash function for a byte array.  For convenience, a 64-bit seed is also
+// hashed into the result.
+uint64_t CityHash64WithSeed(const char *s, size_t len, uint64_t seed);
+
+// Hash function for a byte array.  For convenience, two seeds are also
+// hashed into the result.
+uint64_t CityHash64WithSeeds(const char *s, size_t len, uint64_t seed0,
+                           uint64_t seed1);
+
+// Hash function for a byte array.
+uint128 CityHash128(const char *s, size_t len);
+
+// Hash function for a byte array.  For convenience, a 128-bit seed is also
+// hashed into the result.
+uint128 CityHash128WithSeed(const char *s, size_t len, uint128 seed);
+
+// Hash function for a byte array.  Most useful in 32-bit binaries.
+uint32_t CityHash32(const char *s, size_t len);
+
+// Hash 128 input bits down to 64 bits of output.
+// This is intended to be a reasonably good hash function.
+inline uint64_t Hash128to64(const uint128 &x) {
+  // Murmur-inspired hashing.
+  const uint64_t kMul = 0x9ddfea08eb382d69ULL;
+  uint64_t a = (Uint128Low64(x) ^ Uint128High64(x)) * kMul;
+  a ^= (a >> 47);
+  uint64_t b = (Uint128High64(x) ^ a) * kMul;
+  b ^= (b >> 47);
+  b *= kMul;
+  return b;
+}
+
+}  // namespace hash_internal
+}  // namespace absl
+
+#endif  // ABSL_HASH_INTERNAL_CITY_H_
diff --git a/absl/hash/internal/city_crc.h b/absl/hash/internal/city_crc.h
new file mode 100644
index 0000000..6be6557
--- /dev/null
+++ b/absl/hash/internal/city_crc.h
@@ -0,0 +1,41 @@
+// Copyright 2018 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
+//
+//      http://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.
+//
+// This file declares the subset of the CityHash functions that require
+// _mm_crc32_u64().  See the CityHash README for details.
+//
+// Functions in the CityHash family are not suitable for cryptography.
+
+#ifndef ABSL_HASH_INTERNAL_CITY_CRC_H_
+#define ABSL_HASH_INTERNAL_CITY_CRC_H_
+
+#include "absl/hash/internal/city.h"
+
+namespace absl {
+namespace hash_internal {
+
+// Hash function for a byte array.
+uint128 CityHashCrc128(const char *s, size_t len);
+
+// Hash function for a byte array.  For convenience, a 128-bit seed is also
+// hashed into the result.
+uint128 CityHashCrc128WithSeed(const char *s, size_t len, uint128 seed);
+
+// Hash function for a byte array.  Sets result[0] ... result[3].
+void CityHashCrc256(const char *s, size_t len, uint64_t *result);
+
+}  // namespace hash_internal
+}  // namespace absl
+
+#endif  // ABSL_HASH_INTERNAL_CITY_CRC_H_
diff --git a/absl/hash/internal/city_test.cc b/absl/hash/internal/city_test.cc
new file mode 100644
index 0000000..678da53
--- /dev/null
+++ b/absl/hash/internal/city_test.cc
@@ -0,0 +1,1812 @@
+// Copyright 2018 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
+//
+//      http://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.
+
+#include "absl/hash/internal/city.h"
+
+#include <string.h>
+#include <cstdio>
+#include <iostream>
+#include "gtest/gtest.h"
+#ifdef __SSE4_2__
+#include "absl/hash/internal/city_crc.h"
+#endif
+
+namespace absl {
+namespace hash_internal {
+
+static const uint64_t k0 = 0xc3a5c85c97cb3127ULL;
+static const uint64_t kSeed0 = 1234567;
+static const uint64_t kSeed1 = k0;
+static const uint128 kSeed128(kSeed0, kSeed1);
+static const int kDataSize = 1 << 20;
+static const int kTestSize = 300;
+
+static char data[kDataSize];
+
+// Initialize data to pseudorandom values.
+void setup() {
+  uint64_t a = 9;
+  uint64_t b = 777;
+  for (int i = 0; i < kDataSize; i++) {
+    a += b;
+    b += a;
+    a = (a ^ (a >> 41)) * k0;
+    b = (b ^ (b >> 41)) * k0 + i;
+    uint8_t u = b >> 37;
+    memcpy(data + i, &u, 1);  // uint8_t -> char
+  }
+}
+
+#define C(x) 0x##x##ULL
+static const uint64_t testdata[kTestSize][16] = {
+    {C(9ae16a3b2f90404f), C(75106db890237a4a), C(3feac5f636039766),
+     C(3df09dfc64c09a2b), C(3cb540c392e51e29), C(6b56343feac0663),
+     C(5b7bc50fd8e8ad92), C(3df09dfc64c09a2b), C(3cb540c392e51e29),
+     C(6b56343feac0663), C(5b7bc50fd8e8ad92), C(95162f24e6a5f930),
+     C(6808bdf4f1eb06e0), C(b3b1f3a67b624d82), C(c9a62f12bd4cd80b),
+     C(dc56d17a)},
+    {C(541150e87f415e96), C(1aef0d24b3148a1a), C(bacc300e1e82345a),
+     C(c3cdc41e1df33513), C(2c138ff2596d42f6), C(f58e9082aed3055f),
+     C(162e192b2957163d), C(c3cdc41e1df33513), C(2c138ff2596d42f6),
+     C(f58e9082aed3055f), C(162e192b2957163d), C(fb99e85e0d16f90c),
+     C(608462c15bdf27e8), C(e7d2c5c943572b62), C(1baaa9327642798c),
+     C(99929334)},
+    {C(f3786a4b25827c1), C(34ee1a2bf767bd1c), C(2f15ca2ebfb631f2),
+     C(3149ba1dac77270d), C(70e2e076e30703c), C(59bcc9659bc5296),
+     C(9ecbc8132ae2f1d7), C(3149ba1dac77270d), C(70e2e076e30703c),
+     C(59bcc9659bc5296), C(9ecbc8132ae2f1d7), C(a01d30789bad7cf2),
+     C(ae03fe371981a0e0), C(127e3883b8788934), C(d0ac3d4c0a6fca32),
+     C(4252edb7)},
+    {C(ef923a7a1af78eab), C(79163b1e1e9a9b18), C(df3b2aca6e1e4a30),
+     C(2193fb7620cbf23b), C(8b6a8ff06cda8302), C(1a44469afd3e091f),
+     C(8b0449376612506), C(2193fb7620cbf23b), C(8b6a8ff06cda8302),
+     C(1a44469afd3e091f), C(8b0449376612506), C(e9d9d41c32ad91d1),
+     C(b44ab09f58e3c608), C(19e9175f9fcf784), C(839b3c9581b4a480), C(ebc34f3c)},
+    {C(11df592596f41d88), C(843ec0bce9042f9c), C(cce2ea1e08b1eb30),
+     C(4d09e42f09cc3495), C(666236631b9f253b), C(d28b3763cd02b6a3),
+     C(43b249e57c4d0c1b), C(4d09e42f09cc3495), C(666236631b9f253b),
+     C(d28b3763cd02b6a3), C(43b249e57c4d0c1b), C(3887101c8adea101),
+     C(8a9355d4efc91df0), C(3e610944cc9fecfd), C(5bf9eb60b08ac0ce),
+     C(26f2b463)},
+    {C(831f448bdc5600b3), C(62a24be3120a6919), C(1b44098a41e010da),
+     C(dc07df53b949c6b), C(d2b11b2081aeb002), C(d212b02c1b13f772),
+     C(c0bed297b4be1912), C(dc07df53b949c6b), C(d2b11b2081aeb002),
+     C(d212b02c1b13f772), C(c0bed297b4be1912), C(682d3d2ad304e4af),
+     C(40e9112a655437a1), C(268b09f7ee09843f), C(6b9698d43859ca47),
+     C(b042c047)},
+    {C(3eca803e70304894), C(d80de767e4a920a), C(a51cfbb292efd53d),
+     C(d183dcda5f73edfa), C(3a93cbf40f30128c), C(1a92544d0b41dbda),
+     C(aec2c4bee81975e1), C(d183dcda5f73edfa), C(3a93cbf40f30128c),
+     C(1a92544d0b41dbda), C(aec2c4bee81975e1), C(5f91814d1126ba4b),
+     C(f8ac57eee87fcf1f), C(c55c644a5d0023cd), C(adb761e827825ff2),
+     C(e73bb0a8)},
+    {C(1b5a063fb4c7f9f1), C(318dbc24af66dee9), C(10ef7b32d5c719af),
+     C(b140a02ef5c97712), C(b7d00ef065b51b33), C(635121d532897d98),
+     C(532daf21b312a6d6), C(b140a02ef5c97712), C(b7d00ef065b51b33),
+     C(635121d532897d98), C(532daf21b312a6d6), C(c0b09b75d943910),
+     C(8c84dfb5ef2a8e96), C(e5c06034b0353433), C(3170faf1c33a45dd),
+     C(91dfdd75)},
+    {C(a0f10149a0e538d6), C(69d008c20f87419f), C(41b36376185b3e9e),
+     C(26b6689960ccf81d), C(55f23b27bb9efd94), C(3a17f6166dd765db),
+     C(c891a8a62931e782), C(26b6689960ccf81d), C(55f23b27bb9efd94),
+     C(3a17f6166dd765db), C(c891a8a62931e782), C(23852dc37ddd2607),
+     C(8b7f1b1ec897829e), C(d1d69452a54eed8a), C(56431f2bd766ec24),
+     C(c87f95de)},
+    {C(fb8d9c70660b910b), C(a45b0cc3476bff1b), C(b28d1996144f0207),
+     C(98ec31113e5e35d2), C(5e4aeb853f1b9aa7), C(bcf5c8fe4465b7c8),
+     C(b1ea3a8243996f15), C(98ec31113e5e35d2), C(5e4aeb853f1b9aa7),
+     C(bcf5c8fe4465b7c8), C(b1ea3a8243996f15), C(cabbccedb6407571),
+     C(d1e40a84c445ec3a), C(33302aa908cf4039), C(9f15f79211b5cdf8),
+     C(3f5538ef)},
+    {C(236827beae282a46), C(e43970221139c946), C(4f3ac6faa837a3aa),
+     C(71fec0f972248915), C(2170ec2061f24574), C(9eb346b6caa36e82),
+     C(2908f0fdbca48e73), C(71fec0f972248915), C(2170ec2061f24574),
+     C(9eb346b6caa36e82), C(2908f0fdbca48e73), C(8101c99f07c64abb),
+     C(b9f4b02b1b6a96a7), C(583a2b10cd222f88), C(199dae4cf9db24c), C(70eb1a1f)},
+    {C(c385e435136ecf7c), C(d9d17368ff6c4a08), C(1b31eed4e5251a67),
+     C(df01a322c43a6200), C(298b65a1714b5a7e), C(933b83f0aedf23c),
+     C(157bcb44d63f765a), C(df01a322c43a6200), C(298b65a1714b5a7e),
+     C(933b83f0aedf23c), C(157bcb44d63f765a), C(d6e9fc7a272d8b51),
+     C(3ee5073ef1a9b777), C(63149e31fac02c59), C(2f7979ff636ba1d8),
+     C(cfd63b83)},
+    {C(e3f6828b6017086d), C(21b4d1900554b3b0), C(bef38be1809e24f1),
+     C(d93251758985ee6c), C(32a9e9f82ba2a932), C(3822aacaa95f3329),
+     C(db349b2f90a490d8), C(d93251758985ee6c), C(32a9e9f82ba2a932),
+     C(3822aacaa95f3329), C(db349b2f90a490d8), C(8d49194a894a19ca),
+     C(79a78b06e42738e6), C(7e0f1eda3d390c66), C(1c291d7e641100a5),
+     C(894a52ef)},
+    {C(851fff285561dca0), C(4d1277d73cdf416f), C(28ccffa61010ebe2),
+     C(77a4ccacd131d9ee), C(e1d08eeb2f0e29aa), C(70b9e3051383fa45),
+     C(582d0120425caba), C(77a4ccacd131d9ee), C(e1d08eeb2f0e29aa),
+     C(70b9e3051383fa45), C(582d0120425caba), C(a740eef1846e4564),
+     C(572dddb74ac3ae00), C(fdb5ca9579163bbd), C(a649b9b799c615d2),
+     C(9cde6a54)},
+    {C(61152a63595a96d9), C(d1a3a91ef3a7ba45), C(443b6bb4a493ad0c),
+     C(a154296d11362d06), C(d0f0bf1f1cb02fc1), C(ccb87e09309f90d1),
+     C(b24a8e4881911101), C(a154296d11362d06), C(d0f0bf1f1cb02fc1),
+     C(ccb87e09309f90d1), C(b24a8e4881911101), C(1a481b4528559f58),
+     C(bf837a3150896995), C(4989ef6b941a3757), C(2e725ab72d0b2948),
+     C(6c4898d5)},
+    {C(44473e03be306c88), C(30097761f872472a), C(9fd1b669bfad82d7),
+     C(3bab18b164396783), C(47e385ff9d4c06f), C(18062081bf558df),
+     C(63416eb68f104a36), C(3bab18b164396783), C(47e385ff9d4c06f),
+     C(18062081bf558df), C(63416eb68f104a36), C(4abda1560c47ac80),
+     C(1ea0e63dc6587aee), C(33ec79d92ebc1de), C(94f9dccef771e048), C(13e1978e)},
+    {C(3ead5f21d344056), C(fb6420393cfb05c3), C(407932394cbbd303),
+     C(ac059617f5906673), C(94d50d3dcd3069a7), C(2b26c3b92dea0f0),
+     C(99b7374cc78fc3fb), C(ac059617f5906673), C(94d50d3dcd3069a7),
+     C(2b26c3b92dea0f0), C(99b7374cc78fc3fb), C(1a8e3c73cdd40ee8),
+     C(cbb5fca06747f45b), C(ceec44238b291841), C(28bf35cce9c90a25), C(51b4ba8)},
+    {C(6abbfde37ee03b5b), C(83febf188d2cc113), C(cda7b62d94d5b8ee),
+     C(a4375590b8ae7c82), C(168fd42f9ecae4ff), C(23bbde43de2cb214),
+     C(a8c333112a243c8c), C(a4375590b8ae7c82), C(168fd42f9ecae4ff),
+     C(23bbde43de2cb214), C(a8c333112a243c8c), C(10ac012e8c518b49),
+     C(64a44605d8b29458), C(a67e701d2a679075), C(3a3a20f43ec92303),
+     C(b6b06e40)},
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+     C(c0beec58a5f5fea2), C(ed67436f42e2a78b), C(dfec763cdb2b5193),
+     C(724a8d5345bd2d6), C(94d4fd1b81457c23), C(28e87c50cdede453), C(a0ebd66e)},
+    {C(ab21d81a911e6723), C(4c31b07354852f59), C(835da384c9384744),
+     C(7f759dddc6e8549a), C(616dd0ca022c8735), C(94717ad4bc15ceb3),
+     C(f66c7be808ab36e), C(7f759dddc6e8549a), C(616dd0ca022c8735),
+     C(94717ad4bc15ceb3), C(f66c7be808ab36e), C(af8286b550b2f4b7),
+     C(745bd217d20a9f40), C(c73bfb9c5430f015), C(55e65922666e3fc2),
+     C(4b769593)},
+    {C(33d013cc0cd46ecf), C(3de726423aea122c), C(116af51117fe21a9),
+     C(f271ba474edc562d), C(e6596e67f9dd3ebd), C(c0a288edf808f383),
+     C(b3def70681c6babc), C(f271ba474edc562d), C(e6596e67f9dd3ebd),
+     C(c0a288edf808f383), C(b3def70681c6babc), C(7da7864e9989b095),
+     C(bf2f8718693cd8a1), C(264a9144166da776), C(61ad90676870beb6),
+     C(6aa75624)},
+    {C(8ca92c7cd39fae5d), C(317e620e1bf20f1), C(4f0b33bf2194b97f),
+     C(45744afcf131dbee), C(97222392c2559350), C(498a19b280c6d6ed),
+     C(83ac2c36acdb8d49), C(45744afcf131dbee), C(97222392c2559350),
+     C(498a19b280c6d6ed), C(83ac2c36acdb8d49), C(7a69645c294daa62),
+     C(abe9d2be8275b3d2), C(39542019de371085), C(7f4efac8488cd6ad),
+     C(602a3f96)},
+    {C(fdde3b03f018f43e), C(38f932946c78660), C(c84084ce946851ee),
+     C(b6dd09ba7851c7af), C(570de4e1bb13b133), C(c4e784eb97211642),
+     C(8285a7fcdcc7c58d), C(b6dd09ba7851c7af), C(570de4e1bb13b133),
+     C(c4e784eb97211642), C(8285a7fcdcc7c58d), C(d421f47990da899b),
+     C(8aed409c997eaa13), C(7a045929c2e29ccf), C(b373682a6202c86b),
+     C(cd183c4d)},
+    {C(9c8502050e9c9458), C(d6d2a1a69964beb9), C(1675766f480229b5),
+     C(216e1d6c86cb524c), C(d01cf6fd4f4065c0), C(fffa4ec5b482ea0f),
+     C(a0e20ee6a5404ac1), C(216e1d6c86cb524c), C(d01cf6fd4f4065c0),
+     C(fffa4ec5b482ea0f), C(a0e20ee6a5404ac1), C(c1b037e4eebaf85e),
+     C(634e3d7c3ebf89eb), C(bcda972358c67d1), C(fd1352181e5b8578), C(960a4d07)},
+    {C(348176ca2fa2fdd2), C(3a89c514cc360c2d), C(9f90b8afb318d6d0),
+     C(bceee07c11a9ac30), C(2e2d47dff8e77eb7), C(11a394cd7b6d614a),
+     C(1d7c41d54e15cb4a), C(bceee07c11a9ac30), C(2e2d47dff8e77eb7),
+     C(11a394cd7b6d614a), C(1d7c41d54e15cb4a), C(15baa5ae7312b0fc),
+     C(f398f596cc984635), C(8ab8fdf87a6788e8), C(b2b5c1234ab47e2), C(9ae998c4)},
+    {C(4a3d3dfbbaea130b), C(4e221c920f61ed01), C(553fd6cd1304531f),
+     C(bd2b31b5608143fe), C(ab717a10f2554853), C(293857f04d194d22),
+     C(d51be8fa86f254f0), C(bd2b31b5608143fe), C(ab717a10f2554853),
+     C(293857f04d194d22), C(d51be8fa86f254f0), C(1eee39e07686907e),
+     C(639039fe0e8d3052), C(d6ec1470cef97ff), C(370c82b860034f0f), C(74e2179d)},
+    {C(b371f768cdf4edb9), C(bdef2ace6d2de0f0), C(e05b4100f7f1baec),
+     C(b9e0d415b4ebd534), C(c97c2a27efaa33d7), C(591cdb35f84ef9da),
+     C(a57d02d0e8e3756c), C(b9e0d415b4ebd534), C(c97c2a27efaa33d7),
+     C(591cdb35f84ef9da), C(a57d02d0e8e3756c), C(23f55f12d7c5c87b),
+     C(4c7ca0fe23221101), C(dbc3020480334564), C(d985992f32c236b1),
+     C(ee9bae25)},
+    {C(7a1d2e96934f61f), C(eb1760ae6af7d961), C(887eb0da063005df),
+     C(2228d6725e31b8ab), C(9b98f7e4d0142e70), C(b6a8c2115b8e0fe7),
+     C(b591e2f5ab9b94b1), C(2228d6725e31b8ab), C(9b98f7e4d0142e70),
+     C(b6a8c2115b8e0fe7), C(b591e2f5ab9b94b1), C(6c1feaa8065318e0),
+     C(4e7e2ca21c2e81fb), C(e9fe5d8ce7993c45), C(ee411fa2f12cf8df),
+     C(b66edf10)},
+    {C(8be53d466d4728f2), C(86a5ac8e0d416640), C(984aa464cdb5c8bb),
+     C(87049e68f5d38e59), C(7d8ce44ec6bd7751), C(cc28d08ab414839c),
+     C(6c8f0bd34fe843e3), C(87049e68f5d38e59), C(7d8ce44ec6bd7751),
+     C(cc28d08ab414839c), C(6c8f0bd34fe843e3), C(b8496dcdc01f3e47),
+     C(2f03125c282ac26), C(82a8797ba3f5ef07), C(7c977a4d10bf52b8), C(d6209737)},
+    {C(829677eb03abf042), C(43cad004b6bc2c0), C(f2f224756803971a),
+     C(98d0dbf796480187), C(fbcb5f3e1bef5742), C(5af2a0463bf6e921),
+     C(ad9555bf0120b3a3), C(98d0dbf796480187), C(fbcb5f3e1bef5742),
+     C(5af2a0463bf6e921), C(ad9555bf0120b3a3), C(283e39b3dc99f447),
+     C(bedaa1a4a0250c28), C(9d50546624ff9a57), C(4abaf523d1c090f6), C(b994a88)},
+    {C(754435bae3496fc), C(5707fc006f094dcf), C(8951c86ab19d8e40),
+     C(57c5208e8f021a77), C(f7653fbb69cd9276), C(a484410af21d75cb),
+     C(f19b6844b3d627e8), C(57c5208e8f021a77), C(f7653fbb69cd9276),
+     C(a484410af21d75cb), C(f19b6844b3d627e8), C(f37400fc3ffd9514),
+     C(36ae0d821734edfd), C(5f37820af1f1f306), C(be637d40e6a5ad0), C(a05d43c0)},
+    {C(fda9877ea8e3805f), C(31e868b6ffd521b7), C(b08c90681fb6a0fd),
+     C(68110a7f83f5d3ff), C(6d77e045901b85a8), C(84ef681113036d8b),
+     C(3b9f8e3928f56160), C(68110a7f83f5d3ff), C(6d77e045901b85a8),
+     C(84ef681113036d8b), C(3b9f8e3928f56160), C(fc8b7f56c130835),
+     C(a11f3e800638e841), C(d9572267f5cf28c1), C(7897c8149803f2aa),
+     C(c79f73a8)},
+    {C(2e36f523ca8f5eb5), C(8b22932f89b27513), C(331cd6ecbfadc1bb),
+     C(d1bfe4df12b04cbf), C(f58c17243fd63842), C(3a453cdba80a60af),
+     C(5737b2ca7470ea95), C(d1bfe4df12b04cbf), C(f58c17243fd63842),
+     C(3a453cdba80a60af), C(5737b2ca7470ea95), C(54d44a3f4477030c),
+     C(8168e02d4869aa7f), C(77f383a17778559d), C(95e1737d77a268fc),
+     C(a490aff5)},
+    {C(21a378ef76828208), C(a5c13037fa841da2), C(506d22a53fbe9812),
+     C(61c9c95d91017da5), C(16f7c83ba68f5279), C(9c0619b0808d05f7),
+     C(83c117ce4e6b70a3), C(61c9c95d91017da5), C(16f7c83ba68f5279),
+     C(9c0619b0808d05f7), C(83c117ce4e6b70a3), C(cfb4c8af7fd01413),
+     C(fdef04e602e72296), C(ed6124d337889b1), C(4919c86707b830da), C(dfad65b4)},
+    {C(ccdd5600054b16ca), C(f78846e84204cb7b), C(1f9faec82c24eac9),
+     C(58634004c7b2d19a), C(24bb5f51ed3b9073), C(46409de018033d00),
+     C(4a9805eed5ac802e), C(58634004c7b2d19a), C(24bb5f51ed3b9073),
+     C(46409de018033d00), C(4a9805eed5ac802e), C(e18de8db306baf82),
+     C(46bbf75f1fa025ff), C(5faf2fb09be09487), C(3fbc62bd4e558fb3), C(1d07dfb)},
+    {C(7854468f4e0cabd0), C(3a3f6b4f098d0692), C(ae2423ec7799d30d),
+     C(29c3529eb165eeba), C(443de3703b657c35), C(66acbce31ae1bc8d),
+     C(1acc99effe1d547e), C(29c3529eb165eeba), C(443de3703b657c35),
+     C(66acbce31ae1bc8d), C(1acc99effe1d547e), C(cf07f8a57906573d),
+     C(31bafb0bbb9a86e7), C(40c69492702a9346), C(7df61fdaa0b858af),
+     C(416df9a0)},
+    {C(7f88db5346d8f997), C(88eac9aacc653798), C(68a4d0295f8eefa1),
+     C(ae59ca86f4c3323d), C(25906c09906d5c4c), C(8dd2aa0c0a6584ae),
+     C(232a7d96b38f40e9), C(ae59ca86f4c3323d), C(25906c09906d5c4c),
+     C(8dd2aa0c0a6584ae), C(232a7d96b38f40e9), C(8986ee00a2ed0042),
+     C(c49ae7e428c8a7d1), C(b7dd8280713ac9c2), C(e018720aed1ebc28),
+     C(1f8fb9cc)},
+    {C(bb3fb5fb01d60fcf), C(1b7cc0847a215eb6), C(1246c994437990a1),
+     C(d4edc954c07cd8f3), C(224f47e7c00a30ab), C(d5ad7ad7f41ef0c6),
+     C(59e089281d869fd7), C(d4edc954c07cd8f3), C(224f47e7c00a30ab),
+     C(d5ad7ad7f41ef0c6), C(59e089281d869fd7), C(f29340d07a14b6f1),
+     C(c87c5ef76d9c4ef3), C(463118794193a9a), C(2922dcb0540f0dbc), C(7abf48e3)},
+    {C(2e783e1761acd84d), C(39158042bac975a0), C(1cd21c5a8071188d),
+     C(b1b7ec44f9302176), C(5cb476450dc0c297), C(dc5ef652521ef6a2),
+     C(3cc79a9e334e1f84), C(b1b7ec44f9302176), C(5cb476450dc0c297),
+     C(dc5ef652521ef6a2), C(3cc79a9e334e1f84), C(769e2a283dbcc651),
+     C(9f24b105c8511d3f), C(c31c15575de2f27e), C(ecfecf32c3ae2d66),
+     C(dea4e3dd)},
+    {C(392058251cf22acc), C(944ec4475ead4620), C(b330a10b5cb94166),
+     C(54bc9bee7cbe1767), C(485820bdbe442431), C(54d6120ea2972e90),
+     C(f437a0341f29b72a), C(54bc9bee7cbe1767), C(485820bdbe442431),
+     C(54d6120ea2972e90), C(f437a0341f29b72a), C(8f30885c784d5704),
+     C(aa95376b16c7906a), C(e826928cfaf93dc3), C(20e8f54d1c16d7d8),
+     C(c6064f22)},
+    {C(adf5c1e5d6419947), C(2a9747bc659d28aa), C(95c5b8cb1f5d62c),
+     C(80973ea532b0f310), C(a471829aa9c17dd9), C(c2ff3479394804ab),
+     C(6bf44f8606753636), C(80973ea532b0f310), C(a471829aa9c17dd9),
+     C(c2ff3479394804ab), C(6bf44f8606753636), C(5184d2973e6dd827),
+     C(121b96369a332d9a), C(5c25d3475ab69e50), C(26d2961d62884168),
+     C(743bed9c)},
+    {C(6bc1db2c2bee5aba), C(e63b0ed635307398), C(7b2eca111f30dbbc),
+     C(230d2b3e47f09830), C(ec8624a821c1caf4), C(ea6ec411cdbf1cb1),
+     C(5f38ae82af364e27), C(230d2b3e47f09830), C(ec8624a821c1caf4),
+     C(ea6ec411cdbf1cb1), C(5f38ae82af364e27), C(a519ef515ea7187c),
+     C(6bad5efa7ebae05f), C(748abacb11a74a63), C(a28eef963d1396eb),
+     C(fce254d5)},
+    {C(b00f898229efa508), C(83b7590ad7f6985c), C(2780e70a0592e41d),
+     C(7122413bdbc94035), C(e7f90fae33bf7763), C(4b6bd0fb30b12387),
+     C(557359c0c44f48ca), C(7122413bdbc94035), C(e7f90fae33bf7763),
+     C(4b6bd0fb30b12387), C(557359c0c44f48ca), C(d5656c3d6bc5f0d),
+     C(983ff8e5e784da99), C(628479671b445bf), C(e179a1e27ce68f5d), C(e47ec9d1)},
+    {C(b56eb769ce0d9a8c), C(ce196117bfbcaf04), C(b26c3c3797d66165),
+     C(5ed12338f630ab76), C(fab19fcb319116d), C(167f5f42b521724b),
+     C(c4aa56c409568d74), C(5ed12338f630ab76), C(fab19fcb319116d),
+     C(167f5f42b521724b), C(c4aa56c409568d74), C(75fff4b42f8e9778),
+     C(94218f94710c1ea3), C(b7b05efb738b06a6), C(83fff2deabf9cd3), C(334a145c)},
+    {C(70c0637675b94150), C(259e1669305b0a15), C(46e1dd9fd387a58d),
+     C(fca4e5bc9292788e), C(cd509dc1facce41c), C(bbba575a59d82fe),
+     C(4e2e71c15b45d4d3), C(fca4e5bc9292788e), C(cd509dc1facce41c),
+     C(bbba575a59d82fe), C(4e2e71c15b45d4d3), C(5dc54582ead999c),
+     C(72612d1571963c6f), C(30318a9d2d3d1829), C(785dd00f4cc9c9a0),
+     C(adec1e3c)},
+    {C(74c0b8a6821faafe), C(abac39d7491370e7), C(faf0b2a48a4e6aed),
+     C(967e970df9673d2a), C(d465247cffa415c0), C(33a1df0ca1107722),
+     C(49fc2a10adce4a32), C(967e970df9673d2a), C(d465247cffa415c0),
+     C(33a1df0ca1107722), C(49fc2a10adce4a32), C(c5707e079a284308),
+     C(573028266635dda6), C(f786f5eee6127fa0), C(b30d79cebfb51266),
+     C(f6a9fbf8)},
+    {C(5fb5e48ac7b7fa4f), C(a96170f08f5acbc7), C(bbf5c63d4f52a1e5),
+     C(6cc09e60700563e9), C(d18f23221e964791), C(ffc23eeef7af26eb),
+     C(693a954a3622a315), C(815308a32a9b0daf), C(efb2ab27bf6fd0bd),
+     C(9f1ffc0986111118), C(f9a3aa1778ea3985), C(698fe54b2b93933b),
+     C(dacc2b28404d0f10), C(815308a32a9b0daf), C(efb2ab27bf6fd0bd),
+     C(5398210c)},
+};
+
+void TestUnchanging(const uint64_t* expected, int offset, int len) {
+  const uint128 u = CityHash128(data + offset, len);
+  const uint128 v = CityHash128WithSeed(data + offset, len, kSeed128);
+  EXPECT_EQ(expected[0], CityHash64(data + offset, len));
+  EXPECT_EQ(expected[15], CityHash32(data + offset, len));
+  EXPECT_EQ(expected[1], CityHash64WithSeed(data + offset, len, kSeed0));
+  EXPECT_EQ(expected[2],
+            CityHash64WithSeeds(data + offset, len, kSeed0, kSeed1));
+  EXPECT_EQ(expected[3], Uint128Low64(u));
+  EXPECT_EQ(expected[4], Uint128High64(u));
+  EXPECT_EQ(expected[5], Uint128Low64(v));
+  EXPECT_EQ(expected[6], Uint128High64(v));
+#ifdef __SSE4_2__
+  const uint128 y = CityHashCrc128(data + offset, len);
+  const uint128 z = CityHashCrc128WithSeed(data + offset, len, kSeed128);
+  uint64_t crc256_results[4];
+  CityHashCrc256(data + offset, len, crc256_results);
+  EXPECT_EQ(expected[7], Uint128Low64(y));
+  EXPECT_EQ(expected[8], Uint128High64(y));
+  EXPECT_EQ(expected[9], Uint128Low64(z));
+  EXPECT_EQ(expected[10], Uint128High64(z));
+  for (int i = 0; i < 4; i++) {
+    EXPECT_EQ(expected[11 + i], crc256_results[i]);
+  }
+#endif
+}
+
+TEST(CityHashTest, Unchanging) {
+  setup();
+  int i = 0;
+  for (; i < kTestSize - 1; i++) {
+    TestUnchanging(testdata[i], i * i, i);
+  }
+  TestUnchanging(testdata[i], 0, kDataSize);
+}
+
+}  // namespace hash_internal
+}  // namespace absl
diff --git a/absl/hash/internal/hash.cc b/absl/hash/internal/hash.cc
new file mode 100644
index 0000000..4bf6409
--- /dev/null
+++ b/absl/hash/internal/hash.cc
@@ -0,0 +1,23 @@
+// Copyright 2018 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
+//
+//      http://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.
+
+#include "absl/hash/internal/hash.h"
+
+namespace absl {
+namespace hash_internal {
+
+ABSL_CONST_INIT const void* const CityHashState::kSeed = &kSeed;
+
+}  // namespace hash_internal
+}  // namespace absl
diff --git a/absl/hash/internal/hash.h b/absl/hash/internal/hash.h
new file mode 100644
index 0000000..4543d67
--- /dev/null
+++ b/absl/hash/internal/hash.h
@@ -0,0 +1,885 @@
+// Copyright 2018 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
+//
+//      http://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.
+//
+// -----------------------------------------------------------------------------
+// File: hash.h
+// -----------------------------------------------------------------------------
+//
+#ifndef ABSL_HASH_INTERNAL_HASH_H_
+#define ABSL_HASH_INTERNAL_HASH_H_
+
+#include <algorithm>
+#include <array>
+#include <cmath>
+#include <cstring>
+#include <deque>
+#include <forward_list>
+#include <functional>
+#include <iterator>
+#include <limits>
+#include <list>
+#include <map>
+#include <memory>
+#include <set>
+#include <string>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "absl/base/internal/endian.h"
+#include "absl/base/port.h"
+#include "absl/container/fixed_array.h"
+#include "absl/meta/type_traits.h"
+#include "absl/numeric/int128.h"
+#include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
+#include "absl/types/variant.h"
+#include "absl/utility/utility.h"
+#include "absl/hash/internal/city.h"
+
+namespace absl {
+namespace hash_internal {
+
+// HashStateBase
+//
+// A hash state object represents an intermediate state in the computation
+// of an unspecified hash algorithm. `HashStateBase` provides a CRTP style
+// base class for hash state implementations. Developers adding type support
+// for `absl::Hash` should not rely on any parts of the state object other than
+// the following member functions:
+//
+//   * HashStateBase::combine()
+//   * HashStateBase::combine_contiguous()
+//
+// A derived hash state class of type `H` must provide a static member function
+// with a signature similar to the following:
+//
+//    `static H combine_contiguous(H state, const unsigned char*, size_t)`.
+//
+// `HashStateBase` will provide a complete implementations for a hash state
+// object in terms of this method.
+//
+// Example:
+//
+//   // Use CRTP to define your derived class.
+//   struct MyHashState : HashStateBase<MyHashState> {
+//       static H combine_contiguous(H state, const unsigned char*, size_t);
+//       using MyHashState::HashStateBase::combine;
+//       using MyHashState::HashStateBase::combine_contiguous;
+//   };
+template <typename H>
+class HashStateBase {
+ public:
+  // HashStateBase::combine()
+  //
+  // Combines an arbitrary number of values into a hash state, returning the
+  // updated state.
+  //
+  // Each of the value types `T` must be separately hashable by the Abseil
+  // hashing framework.
+  //
+  // NOTE:
+  //
+  //   state = H::combine(std::move(state), value1, value2, value3);
+  //
+  // is guaranteed to produce the same hash expansion as:
+  //
+  //   state = H::combine(std::move(state), value1);
+  //   state = H::combine(std::move(state), value2);
+  //   state = H::combine(std::move(state), value3);
+  template <typename T, typename... Ts>
+  static H combine(H state, const T& value, const Ts&... values);
+  static H combine(H state) { return state; }
+
+  // HashStateBase::combine_contiguous()
+  //
+  // Combines a contiguous array of `size` elements into a hash state, returning
+  // the updated state.
+  //
+  // NOTE:
+  //
+  //   state = H::combine_contiguous(std::move(state), data, size);
+  //
+  // is NOT guaranteed to produce the same hash expansion as a for-loop (it may
+  // perform internal optimizations).  If you need this guarantee, use the
+  // for-loop instead.
+  template <typename T>
+  static H combine_contiguous(H state, const T* data, size_t size);
+};
+
+// is_uniquely_represented
+//
+// `is_uniquely_represented<T>` is a trait class that indicates whether `T`
+// is uniquely represented.
+//
+// A type is "uniquely represented" if two equal values of that type are
+// guaranteed to have the same bytes in their underlying storage. In other
+// words, if `a == b`, then `memcmp(&a, &b, sizeof(T))` is guaranteed to be
+// zero. This property cannot be detected automatically, so this trait is false
+// by default, but can be specialized by types that wish to assert that they are
+// uniquely represented. This makes them eligible for certain optimizations.
+//
+// If you have any doubt whatsoever, do not specialize this template.
+// The default is completely safe, and merely disables some optimizations
+// that will not matter for most types. Specializing this template,
+// on the other hand, can be very hazardous.
+//
+// To be uniquely represented, a type must not have multiple ways of
+// representing the same value; for example, float and double are not
+// uniquely represented, because they have distinct representations for
+// +0 and -0. Furthermore, the type's byte representation must consist
+// solely of user-controlled data, with no padding bits and no compiler-
+// controlled data such as vptrs or sanitizer metadata. This is usually
+// very difficult to guarantee, because in most cases the compiler can
+// insert data and padding bits at its own discretion.
+//
+// If you specialize this template for a type `T`, you must do so in the file
+// that defines that type (or in this file). If you define that specialization
+// anywhere else, `is_uniquely_represented<T>` could have different meanings
+// in different places.
+//
+// The Enable parameter is meaningless; it is provided as a convenience,
+// to support certain SFINAE techniques when defining specializations.
+template <typename T, typename Enable = void>
+struct is_uniquely_represented : std::false_type {};
+
+// is_uniquely_represented<unsigned char>
+//
+// unsigned char is a synonym for "byte", so it is guaranteed to be
+// uniquely represented.
+template <>
+struct is_uniquely_represented<unsigned char> : std::true_type {};
+
+// is_uniquely_represented for non-standard integral types
+//
+// Integral types other than bool should be uniquely represented on any
+// platform that this will plausibly be ported to.
+template <typename Integral>
+struct is_uniquely_represented<
+    Integral, typename std::enable_if<std::is_integral<Integral>::value>::type>
+    : std::true_type {};
+
+// is_uniquely_represented<bool>
+//
+//
+template <>
+struct is_uniquely_represented<bool> : std::false_type {};
+
+// hash_bytes()
+//
+// Convenience function that combines `hash_state` with the byte representation
+// of `value`.
+template <typename H, typename T>
+H hash_bytes(H hash_state, const T& value) {
+  const unsigned char* start = reinterpret_cast<const unsigned char*>(&value);
+  return H::combine_contiguous(std::move(hash_state), start, sizeof(value));
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for Basic Types
+// -----------------------------------------------------------------------------
+
+// Note: Default `AbslHashValue` implementations live in `hash_internal`. This
+// allows us to block lexical scope lookup when doing an unqualified call to
+// `AbslHashValue` below. User-defined implementations of `AbslHashValue` can
+// only be found via ADL.
+
+// AbslHashValue() for hashing bool values
+//
+// We use SFINAE to ensure that this overload only accepts bool, not types that
+// are convertible to bool.
+template <typename H, typename B>
+typename std::enable_if<std::is_same<B, bool>::value, H>::type AbslHashValue(
+    H hash_state, B value) {
+  return H::combine(std::move(hash_state),
+                    static_cast<unsigned char>(value ? 1 : 0));
+}
+
+// AbslHashValue() for hashing enum values
+template <typename H, typename Enum>
+typename std::enable_if<std::is_enum<Enum>::value, H>::type AbslHashValue(
+    H hash_state, Enum e) {
+  // In practice, we could almost certainly just invoke hash_bytes directly,
+  // but it's possible that a sanitizer might one day want to
+  // store data in the unused bits of an enum. To avoid that risk, we
+  // convert to the underlying type before hashing. Hopefully this will get
+  // optimized away; if not, we can reopen discussion with c-toolchain-team.
+  return H::combine(std::move(hash_state),
+                    static_cast<typename std::underlying_type<Enum>::type>(e));
+}
+// AbslHashValue() for hashing floating-point values
+template <typename H, typename Float>
+typename std::enable_if<std::is_floating_point<Float>::value, H>::type
+AbslHashValue(H hash_state, Float value) {
+  return hash_internal::hash_bytes(std::move(hash_state),
+                                   value == 0 ? 0 : value);
+}
+
+// Long double has the property that it might have extra unused bytes in it.
+// For example, in x86 sizeof(long double)==16 but it only really uses 80-bits
+// of it. This means we can't use hash_bytes on a long double and have to
+// convert it to something else first.
+template <typename H>
+H AbslHashValue(H hash_state, long double value) {
+  const int category = std::fpclassify(value);
+  switch (category) {
+    case FP_INFINITE:
+      // Add the sign bit to differentiate between +Inf and -Inf
+      hash_state = H::combine(std::move(hash_state), std::signbit(value));
+      break;
+
+    case FP_NAN:
+    case FP_ZERO:
+    default:
+      // Category is enough for these.
+      break;
+
+    case FP_NORMAL:
+    case FP_SUBNORMAL:
+      // We can't convert `value` directly to double because this would have
+      // undefined behavior if the value is out of range.
+      // std::frexp gives us a value in the range (-1, -.5] or [.5, 1) that is
+      // guaranteed to be in range for `double`. The truncation is
+      // implementation defined, but that works as long as it is deterministic.
+      int exp;
+      auto mantissa = static_cast<double>(std::frexp(value, &exp));
+      hash_state = H::combine(std::move(hash_state), mantissa, exp);
+  }
+
+  return H::combine(std::move(hash_state), category);
+}
+
+// AbslHashValue() for hashing pointers
+template <typename H, typename T>
+H AbslHashValue(H hash_state, T* ptr) {
+  return hash_internal::hash_bytes(std::move(hash_state), ptr);
+}
+
+// AbslHashValue() for hashing nullptr_t
+template <typename H>
+H AbslHashValue(H hash_state, std::nullptr_t) {
+  return H::combine(std::move(hash_state), static_cast<void*>(nullptr));
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for Composite Types
+// -----------------------------------------------------------------------------
+
+// is_hashable()
+//
+// Trait class which returns true if T is hashable by the absl::Hash framework.
+// Used for the AbslHashValue implementations for composite types below.
+template <typename T>
+struct is_hashable;
+
+// AbslHashValue() for hashing pairs
+template <typename H, typename T1, typename T2>
+typename std::enable_if<is_hashable<T1>::value && is_hashable<T2>::value,
+                        H>::type
+AbslHashValue(H hash_state, const std::pair<T1, T2>& p) {
+  return H::combine(std::move(hash_state), p.first, p.second);
+}
+
+// hash_tuple()
+//
+// Helper function for hashing a tuple. The third argument should
+// be an index_sequence running from 0 to tuple_size<Tuple> - 1.
+template <typename H, typename Tuple, size_t... Is>
+H hash_tuple(H hash_state, const Tuple& t, absl::index_sequence<Is...>) {
+  return H::combine(std::move(hash_state), std::get<Is>(t)...);
+}
+
+// AbslHashValue for hashing tuples
+template <typename H, typename... Ts>
+#if _MSC_VER
+// This SFINAE gets MSVC confused under some conditions. Let's just disable it
+// for now.
+H
+#else
+typename std::enable_if<absl::conjunction<is_hashable<Ts>...>::value, H>::type
+#endif
+AbslHashValue(H hash_state, const std::tuple<Ts...>& t) {
+  return hash_internal::hash_tuple(std::move(hash_state), t,
+                                   absl::make_index_sequence<sizeof...(Ts)>());
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for Pointers
+// -----------------------------------------------------------------------------
+
+// AbslHashValue for hashing unique_ptr
+template <typename H, typename T, typename D>
+H AbslHashValue(H hash_state, const std::unique_ptr<T, D>& ptr) {
+  return H::combine(std::move(hash_state), ptr.get());
+}
+
+// AbslHashValue for hashing shared_ptr
+template <typename H, typename T>
+H AbslHashValue(H hash_state, const std::shared_ptr<T>& ptr) {
+  return H::combine(std::move(hash_state), ptr.get());
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for String-Like Types
+// -----------------------------------------------------------------------------
+
+// AbslHashValue for hashing strings
+//
+// All the string-like types supported here provide the same hash expansion for
+// the same character sequence. These types are:
+//
+//  - `std::string` (and std::basic_string<char, std::char_traits<char>, A> for
+//      any allocator A)
+//  - `absl::string_view` and `std::string_view`
+//
+// For simplicity, we currently support only `char` strings. This support may
+// be broadened, if necessary, but with some caution - this overload would
+// misbehave in cases where the traits' `eq()` member isn't equivalent to `==`
+// on the underlying character type.
+template <typename H>
+H AbslHashValue(H hash_state, absl::string_view str) {
+  return H::combine(
+      H::combine_contiguous(std::move(hash_state), str.data(), str.size()),
+      str.size());
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for Sequence Containers
+// -----------------------------------------------------------------------------
+
+// AbslHashValue for hashing std::array
+template <typename H, typename T, size_t N>
+typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue(
+    H hash_state, const std::array<T, N>& array) {
+  return H::combine_contiguous(std::move(hash_state), array.data(),
+                               array.size());
+}
+
+// AbslHashValue for hashing std::deque
+template <typename H, typename T, typename Allocator>
+typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue(
+    H hash_state, const std::deque<T, Allocator>& deque) {
+  // TODO(gromer): investigate a more efficient implementation taking
+  // advantage of the chunk structure.
+  for (const auto& t : deque) {
+    hash_state = H::combine(std::move(hash_state), t);
+  }
+  return H::combine(std::move(hash_state), deque.size());
+}
+
+// AbslHashValue for hashing std::forward_list
+template <typename H, typename T, typename Allocator>
+typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue(
+    H hash_state, const std::forward_list<T, Allocator>& list) {
+  size_t size = 0;
+  for (const T& t : list) {
+    hash_state = H::combine(std::move(hash_state), t);
+    ++size;
+  }
+  return H::combine(std::move(hash_state), size);
+}
+
+// AbslHashValue for hashing std::list
+template <typename H, typename T, typename Allocator>
+typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue(
+    H hash_state, const std::list<T, Allocator>& list) {
+  for (const auto& t : list) {
+    hash_state = H::combine(std::move(hash_state), t);
+  }
+  return H::combine(std::move(hash_state), list.size());
+}
+
+// AbslHashValue for hashing std::vector
+//
+// Do not use this for vector<bool>. It does not have a .data(), and a fallback
+// for std::hash<> is most likely faster.
+template <typename H, typename T, typename Allocator>
+typename std::enable_if<is_hashable<T>::value && !std::is_same<T, bool>::value,
+                        H>::type
+AbslHashValue(H hash_state, const std::vector<T, Allocator>& vector) {
+  return H::combine(H::combine_contiguous(std::move(hash_state), vector.data(),
+                                          vector.size()),
+                    vector.size());
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for Ordered Associative Containers
+// -----------------------------------------------------------------------------
+
+// AbslHashValue for hashing std::map
+template <typename H, typename Key, typename T, typename Compare,
+          typename Allocator>
+typename std::enable_if<is_hashable<Key>::value && is_hashable<T>::value,
+                        H>::type
+AbslHashValue(H hash_state, const std::map<Key, T, Compare, Allocator>& map) {
+  for (const auto& t : map) {
+    hash_state = H::combine(std::move(hash_state), t);
+  }
+  return H::combine(std::move(hash_state), map.size());
+}
+
+// AbslHashValue for hashing std::multimap
+template <typename H, typename Key, typename T, typename Compare,
+          typename Allocator>
+typename std::enable_if<is_hashable<Key>::value && is_hashable<T>::value,
+                        H>::type
+AbslHashValue(H hash_state,
+              const std::multimap<Key, T, Compare, Allocator>& map) {
+  for (const auto& t : map) {
+    hash_state = H::combine(std::move(hash_state), t);
+  }
+  return H::combine(std::move(hash_state), map.size());
+}
+
+// AbslHashValue for hashing std::set
+template <typename H, typename Key, typename Compare, typename Allocator>
+typename std::enable_if<is_hashable<Key>::value, H>::type AbslHashValue(
+    H hash_state, const std::set<Key, Compare, Allocator>& set) {
+  for (const auto& t : set) {
+    hash_state = H::combine(std::move(hash_state), t);
+  }
+  return H::combine(std::move(hash_state), set.size());
+}
+
+// AbslHashValue for hashing std::multiset
+template <typename H, typename Key, typename Compare, typename Allocator>
+typename std::enable_if<is_hashable<Key>::value, H>::type AbslHashValue(
+    H hash_state, const std::multiset<Key, Compare, Allocator>& set) {
+  for (const auto& t : set) {
+    hash_state = H::combine(std::move(hash_state), t);
+  }
+  return H::combine(std::move(hash_state), set.size());
+}
+
+// -----------------------------------------------------------------------------
+// AbslHashValue for Wrapper Types
+// -----------------------------------------------------------------------------
+
+// AbslHashValue for hashing absl::optional
+template <typename H, typename T>
+typename std::enable_if<is_hashable<T>::value, H>::type AbslHashValue(
+    H hash_state, const absl::optional<T>& opt) {
+  if (opt) hash_state = H::combine(std::move(hash_state), *opt);
+  return H::combine(std::move(hash_state), opt.has_value());
+}
+
+// VariantVisitor
+template <typename H>
+struct VariantVisitor {
+  H&& hash_state;
+  template <typename T>
+  H operator()(const T& t) const {
+    return H::combine(std::move(hash_state), t);
+  }
+};
+
+// AbslHashValue for hashing absl::variant
+template <typename H, typename... T>
+typename std::enable_if<conjunction<is_hashable<T>...>::value, H>::type
+AbslHashValue(H hash_state, const absl::variant<T...>& v) {
+  if (!v.valueless_by_exception()) {
+    hash_state = absl::visit(VariantVisitor<H>{std::move(hash_state)}, v);
+  }
+  return H::combine(std::move(hash_state), v.index());
+}
+// -----------------------------------------------------------------------------
+
+// hash_range_or_bytes()
+//
+// Mixes all values in the range [data, data+size) into the hash state.
+// This overload accepts only uniquely-represented types, and hashes them by
+// hashing the entire range of bytes.
+template <typename H, typename T>
+typename std::enable_if<is_uniquely_represented<T>::value, H>::type
+hash_range_or_bytes(H hash_state, const T* data, size_t size) {
+  const auto* bytes = reinterpret_cast<const unsigned char*>(data);
+  return H::combine_contiguous(std::move(hash_state), bytes, sizeof(T) * size);
+}
+
+// hash_range_or_bytes()
+template <typename H, typename T>
+typename std::enable_if<!is_uniquely_represented<T>::value, H>::type
+hash_range_or_bytes(H hash_state, const T* data, size_t size) {
+  for (const auto end = data + size; data < end; ++data) {
+    hash_state = H::combine(std::move(hash_state), *data);
+  }
+  return hash_state;
+}
+
+// InvokeHashTag
+//
+// InvokeHash(H, const T&) invokes the appropriate hash implementation for a
+// hasher of type `H` and a value of type `T`. If `T` is not hashable, there
+// will be no matching overload of InvokeHash().
+// Note: Some platforms (eg MSVC) do not support the detect idiom on
+// std::hash. In those platforms the last fallback will be std::hash and
+// InvokeHash() will always have a valid overload even if std::hash<T> is not
+// valid.
+//
+// We try the following options in order:
+//   * If is_uniquely_represented, hash bytes directly.
+//   * ADL AbslHashValue(H, const T&) call.
+//   * std::hash<T>
+
+// In MSVC we can't probe std::hash or stdext::hash because it triggers a
+// static_assert instead of failing substitution.
+#if defined(_MSC_VER)
+#undef ABSL_HASH_INTERNAL_CAN_POISON_
+#else   // _MSC_VER
+#define ABSL_HASH_INTERNAL_CAN_POISON_ 1
+#endif  // _MSC_VER
+
+#if defined(ABSL_INTERNAL_LEGACY_HASH_NAMESPACE) && \
+    ABSL_HASH_INTERNAL_CAN_POISON_
+#define ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_ 1
+#endif
+
+enum class InvokeHashTag {
+  kUniquelyRepresented,
+  kHashValue,
+#if ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+  kLegacyHash,
+#endif  // ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+  kStdHash,
+  kNone
+};
+
+// HashSelect
+//
+// Type trait to select the appropriate hash implementation to use.
+// HashSelect<T>::value is an instance of InvokeHashTag that indicates the best
+// available hashing mechanism.
+// See `Note` above about MSVC.
+template <typename T>
+struct HashSelect {
+ private:
+  struct State : HashStateBase<State> {
+    static State combine_contiguous(State hash_state, const unsigned char*,
+                                    size_t);
+    using State::HashStateBase::combine_contiguous;
+  };
+
+  // `Probe<V, Tag>::value` evaluates to `V<T>::value` if it is a valid
+  // expression, and `false` otherwise.
+  // `Probe<V, Tag>::tag` always evaluates to `Tag`.
+  template <template <typename> class V, InvokeHashTag Tag>
+  struct Probe {
+   private:
+    template <typename U, typename std::enable_if<V<U>::value, int>::type = 0>
+    static std::true_type Test(int);
+    template <typename U>
+    static std::false_type Test(char);
+
+   public:
+    static constexpr InvokeHashTag kTag = Tag;
+    static constexpr bool value = decltype(
+        Test<absl::remove_const_t<absl::remove_reference_t<T>>>(0))::value;
+  };
+
+  template <typename U>
+  using ProbeUniquelyRepresented = is_uniquely_represented<U>;
+
+  template <typename U>
+  using ProbeHashValue =
+      std::is_same<State, decltype(AbslHashValue(std::declval<State>(),
+                                                 std::declval<const U&>()))>;
+
+#if ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+  template <typename U>
+  using ProbeLegacyHash =
+      std::is_convertible<decltype(ABSL_INTERNAL_LEGACY_HASH_NAMESPACE::hash<
+                                   U>()(std::declval<const U&>())),
+                          size_t>;
+#endif  // ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+
+  template <typename U>
+  using ProbeStdHash =
+#if ABSL_HASH_INTERNAL_CAN_POISON_
+      std::is_convertible<decltype(std::hash<U>()(std::declval<const U&>())),
+                          size_t>;
+#else   // ABSL_HASH_INTERNAL_CAN_POISON_
+      std::true_type;
+#endif  // ABSL_HASH_INTERNAL_CAN_POISON_
+
+  template <typename U>
+  using ProbeNone = std::true_type;
+
+ public:
+  // Probe each implementation in order.
+  // disjunction provides short circuting wrt instantiation.
+  static constexpr InvokeHashTag value = absl::disjunction<
+      Probe<ProbeUniquelyRepresented, InvokeHashTag::kUniquelyRepresented>,
+      Probe<ProbeHashValue, InvokeHashTag::kHashValue>,
+#if ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+      Probe<ProbeLegacyHash, InvokeHashTag::kLegacyHash>,
+#endif  // ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+      Probe<ProbeStdHash, InvokeHashTag::kStdHash>,
+      Probe<ProbeNone, InvokeHashTag::kNone>>::kTag;
+};
+
+template <typename T>
+struct is_hashable : std::integral_constant<bool, HashSelect<T>::value !=
+                                                      InvokeHashTag::kNone> {};
+
+template <typename H, typename T>
+absl::enable_if_t<HashSelect<T>::value == InvokeHashTag::kUniquelyRepresented,
+                  H>
+InvokeHash(H state, const T& value) {
+  return hash_internal::hash_bytes(std::move(state), value);
+}
+
+template <typename H, typename T>
+absl::enable_if_t<HashSelect<T>::value == InvokeHashTag::kHashValue, H>
+InvokeHash(H state, const T& value) {
+  return AbslHashValue(std::move(state), value);
+}
+
+#if ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+template <typename H, typename T>
+absl::enable_if_t<HashSelect<T>::value == InvokeHashTag::kLegacyHash, H>
+InvokeHash(H state, const T& value) {
+  return hash_internal::hash_bytes(
+      std::move(state), ABSL_INTERNAL_LEGACY_HASH_NAMESPACE::hash<T>{}(value));
+}
+#endif  // ABSL_HASH_INTERNAL_SUPPORT_LEGACY_HASH_
+
+template <typename H, typename T>
+absl::enable_if_t<HashSelect<T>::value == InvokeHashTag::kStdHash, H>
+InvokeHash(H state, const T& value) {
+  return hash_internal::hash_bytes(std::move(state), std::hash<T>{}(value));
+}
+
+// CityHashState
+class CityHashState : public HashStateBase<CityHashState> {
+  // absl::uint128 is not an alias or a thin wrapper around the intrinsic.
+  // We use the intrinsic when available to improve performance.
+#ifdef ABSL_HAVE_INTRINSIC_INT128
+  using uint128 = __uint128_t;
+#else   // ABSL_HAVE_INTRINSIC_INT128
+  using uint128 = absl::uint128;
+#endif  // ABSL_HAVE_INTRINSIC_INT128
+
+  static constexpr uint64_t kMul =
+      sizeof(size_t) == 4 ? uint64_t{0xcc9e2d51} : uint64_t{0x9ddfea08eb382d69};
+
+  template <typename T>
+  using IntegralFastPath =
+      conjunction<std::is_integral<T>, is_uniquely_represented<T>>;
+
+ public:
+  // Move only
+  CityHashState(CityHashState&&) = default;
+  CityHashState& operator=(CityHashState&&) = default;
+
+  // CityHashState::combine_contiguous()
+  //
+  // Fundamental base case for hash recursion: mixes the given range of bytes
+  // into the hash state.
+  static CityHashState combine_contiguous(CityHashState hash_state,
+                                          const unsigned char* first,
+                                          size_t size) {
+    return CityHashState(
+        CombineContiguousImpl(hash_state.state_, first, size,
+                              std::integral_constant<int, sizeof(size_t)>{}));
+  }
+  using CityHashState::HashStateBase::combine_contiguous;
+
+  // CityHashState::hash()
+  //
+  // For performance reasons in non-opt mode, we specialize this for
+  // integral types.
+  // Otherwise we would be instantiating and calling dozens of functions for
+  // something that is just one multiplication and a couple xor's.
+  // The result should be the same as running the whole algorithm, but faster.
+  template <typename T, absl::enable_if_t<IntegralFastPath<T>::value, int> = 0>
+  static size_t hash(T value) {
+    return static_cast<size_t>(Mix(Seed(), static_cast<uint64_t>(value)));
+  }
+
+  // Overload of CityHashState::hash()
+  template <typename T, absl::enable_if_t<!IntegralFastPath<T>::value, int> = 0>
+  static size_t hash(const T& value) {
+    return static_cast<size_t>(combine(CityHashState{}, value).state_);
+  }
+
+ private:
+  // Invoked only once for a given argument; that plus the fact that this is
+  // move-only ensures that there is only one non-moved-from object.
+  CityHashState() : state_(Seed()) {}
+
+  // Workaround for MSVC bug.
+  // We make the type copyable to fix the calling convention, even though we
+  // never actually copy it. Keep it private to not affect the public API of the
+  // type.
+  CityHashState(const CityHashState&) = default;
+
+  explicit CityHashState(uint64_t state) : state_(state) {}
+
+  // Implementation of the base case for combine_contiguous where we actually
+  // mix the bytes into the state.
+  // Dispatch to different implementations of the combine_contiguous depending
+  // on the value of `sizeof(size_t)`.
+  static uint64_t CombineContiguousImpl(uint64_t state,
+                                        const unsigned char* first, size_t len,
+                                        std::integral_constant<int, 4>
+                                        /* sizeof_size_t */);
+  static uint64_t CombineContiguousImpl(uint64_t state,
+                                        const unsigned char* first, size_t len,
+                                        std::integral_constant<int, 8>
+                                        /* sizeof_size_t*/);
+
+  // Reads 9 to 16 bytes from p.
+  // The first 8 bytes are in .first, the rest (zero padded) bytes are in
+  // .second.
+  static std::pair<uint64_t, uint64_t> Read9To16(const unsigned char* p,
+                                                 size_t len) {
+    uint64_t high = little_endian::Load64(p + len - 8);
+    return {little_endian::Load64(p), high >> (128 - len * 8)};
+  }
+
+  // Reads 4 to 8 bytes from p. Zero pads to fill uint64_t.
+  static uint64_t Read4To8(const unsigned char* p, size_t len) {
+    return (static_cast<uint64_t>(little_endian::Load32(p + len - 4))
+            << (len - 4) * 8) |
+           little_endian::Load32(p);
+  }
+
+  // Reads 1 to 3 bytes from p. Zero pads to fill uint32_t.
+  static uint32_t Read1To3(const unsigned char* p, size_t len) {
+    return static_cast<uint32_t>((p[0]) |                         //
+                                 (p[len / 2] << (len / 2 * 8)) |  //
+                                 (p[len - 1] << ((len - 1) * 8)));
+  }
+
+  ABSL_ATTRIBUTE_ALWAYS_INLINE static uint64_t Mix(uint64_t state, uint64_t v) {
+    using MultType =
+        absl::conditional_t<sizeof(size_t) == 4, uint64_t, uint128>;
+    // We do the addition in 64-bit space to make sure the 128-bit
+    // multiplication is fast. If we were to do it as MultType the compiler has
+    // to assume that the high word is non-zero and needs to perform 2
+    // multiplications instead of one.
+    MultType m = state + v;
+    m *= kMul;
+    return static_cast<uint64_t>(m ^ (m >> (sizeof(m) * 8 / 2)));
+  }
+
+  // Seed()
+  //
+  // A non-deterministic seed.
+  //
+  // The current purpose of this seed is to generate non-deterministic results
+  // and prevent having users depend on the particular hash values.
+  // It is not meant as a security feature right now, but it leaves the door
+  // open to upgrade it to a true per-process random seed. A true random seed
+  // costs more and we don't need to pay for that right now.
+  //
+  // On platforms with ASLR, we take advantage of it to make a per-process
+  // random value.
+  // See https://en.wikipedia.org/wiki/Address_space_layout_randomization
+  //
+  // On other platforms this is still going to be non-deterministic but most
+  // probably per-build and not per-process.
+  ABSL_ATTRIBUTE_ALWAYS_INLINE static uint64_t Seed() {
+    return static_cast<uint64_t>(reinterpret_cast<uintptr_t>(kSeed));
+  }
+  static const void* const kSeed;
+
+  uint64_t state_;
+};
+
+// CityHashState::CombineContiguousImpl()
+inline uint64_t CityHashState::CombineContiguousImpl(
+    uint64_t state, const unsigned char* first, size_t len,
+    std::integral_constant<int, 4> /* sizeof_size_t */) {
+  // For large values we use CityHash, for small ones we just use a
+  // multiplicative hash.
+  uint64_t v;
+  if (len > 8) {
+    v = absl::hash_internal::CityHash32(reinterpret_cast<const char*>(first), len);
+  } else if (len >= 4) {
+    v = Read4To8(first, len);
+  } else if (len > 0) {
+    v = Read1To3(first, len);
+  } else {
+    // Empty ranges have no effect.
+    return state;
+  }
+  return Mix(state, v);
+}
+
+// Overload of CityHashState::CombineContiguousImpl()
+inline uint64_t CityHashState::CombineContiguousImpl(
+    uint64_t state, const unsigned char* first, size_t len,
+    std::integral_constant<int, 8> /* sizeof_size_t */) {
+  // For large values we use CityHash, for small ones we just use a
+  // multiplicative hash.
+  uint64_t v;
+  if (len > 16) {
+    v = absl::hash_internal::CityHash64(reinterpret_cast<const char*>(first), len);
+  } else if (len > 8) {
+    auto p = Read9To16(first, len);
+    state = Mix(state, p.first);
+    v = p.second;
+  } else if (len >= 4) {
+    v = Read4To8(first, len);
+  } else if (len > 0) {
+    v = Read1To3(first, len);
+  } else {
+    // Empty ranges have no effect.
+    return state;
+  }
+  return Mix(state, v);
+}
+
+
+struct AggregateBarrier {};
+
+// HashImpl
+
+// Add a private base class to make sure this type is not an aggregate.
+// Aggregates can be aggregate initialized even if the default constructor is
+// deleted.
+struct PoisonedHash : private AggregateBarrier {
+  PoisonedHash() = delete;
+  PoisonedHash(const PoisonedHash&) = delete;
+  PoisonedHash& operator=(const PoisonedHash&) = delete;
+};
+
+template <typename T>
+struct HashImpl {
+  size_t operator()(const T& value) const { return CityHashState::hash(value); }
+};
+
+template <typename T>
+struct Hash
+    : absl::conditional_t<is_hashable<T>::value, HashImpl<T>, PoisonedHash> {};
+
+template <typename H>
+template <typename T, typename... Ts>
+H HashStateBase<H>::combine(H state, const T& value, const Ts&... values) {
+  return H::combine(hash_internal::InvokeHash(std::move(state), value),
+                    values...);
+}
+
+// HashStateBase::combine_contiguous()
+template <typename H>
+template <typename T>
+H HashStateBase<H>::combine_contiguous(H state, const T* data, size_t size) {
+  return hash_internal::hash_range_or_bytes(std::move(state), data, size);
+}
+}  // namespace hash_internal
+}  // namespace absl
+
+#endif  // ABSL_HASH_INTERNAL_HASH_H_
diff --git a/absl/hash/internal/print_hash_of.cc b/absl/hash/internal/print_hash_of.cc
new file mode 100644
index 0000000..b6df31c
--- /dev/null
+++ b/absl/hash/internal/print_hash_of.cc
@@ -0,0 +1,23 @@
+// Copyright 2018 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
+//
+//      http://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.
+
+#include <cstdlib>
+
+#include "absl/hash/hash.h"
+
+// Prints the hash of argv[1].
+int main(int argc, char** argv) {
+  if (argc < 2) return 1;
+  printf("%zu\n", absl::Hash<int>{}(std::atoi(argv[1])));  // NOLINT
+}
diff --git a/absl/hash/internal/spy_hash_state.h b/absl/hash/internal/spy_hash_state.h
new file mode 100644
index 0000000..03d795b
--- /dev/null
+++ b/absl/hash/internal/spy_hash_state.h
@@ -0,0 +1,218 @@
+// Copyright 2018 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
+//
+//      http://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_HASH_INTERNAL_SPY_HASH_STATE_H_
+#define ABSL_HASH_INTERNAL_SPY_HASH_STATE_H_
+
+#include <ostream>
+#include <string>
+#include <vector>
+
+#include "absl/hash/hash.h"
+#include "absl/strings/match.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/str_join.h"
+
+namespace absl {
+namespace hash_internal {
+
+// SpyHashState is an implementation of the HashState API that simply
+// accumulates all input bytes in an internal buffer. This makes it useful
+// for testing AbslHashValue overloads (so long as they are templated on the
+// HashState parameter), since it can report the exact hash representation
+// that the AbslHashValue overload produces.
+//
+// Sample usage:
+// EXPECT_EQ(SpyHashState::combine(SpyHashState(), foo),
+//           SpyHashState::combine(SpyHashState(), bar));
+template <typename T>
+class SpyHashStateImpl : public HashStateBase<SpyHashStateImpl<T>> {
+ public:
+  SpyHashStateImpl()
+      : error_(std::make_shared<absl::optional<std::string>>()) {
+    static_assert(std::is_void<T>::value, "");
+  }
+
+  // Move-only
+  SpyHashStateImpl(const SpyHashStateImpl&) = delete;
+  SpyHashStateImpl& operator=(const SpyHashStateImpl&) = delete;
+
+  SpyHashStateImpl(SpyHashStateImpl&& other) noexcept {
+    *this = std::move(other);
+  }
+
+  SpyHashStateImpl& operator=(SpyHashStateImpl&& other) noexcept {
+    hash_representation_ = std::move(other.hash_representation_);
+    error_ = other.error_;
+    moved_from_ = other.moved_from_;
+    other.moved_from_ = true;
+    return *this;
+  }
+
+  template <typename U>
+  SpyHashStateImpl(SpyHashStateImpl<U>&& other) {  // NOLINT
+    hash_representation_ = std::move(other.hash_representation_);
+    error_ = other.error_;
+    moved_from_ = other.moved_from_;
+    other.moved_from_ = true;
+  }
+
+  template <typename A, typename... Args>
+  static SpyHashStateImpl combine(SpyHashStateImpl s, const A& a,
+                                  const Args&... args) {
+    // Pass an instance of SpyHashStateImpl<A> when trying to combine `A`. This
+    // allows us to test that the user only uses this instance for combine calls
+    // and does not call AbslHashValue directly.
+    // See AbslHashValue implementation at the bottom.
+    s = SpyHashStateImpl<A>::HashStateBase::combine(std::move(s), a);
+    return SpyHashStateImpl::combine(std::move(s), args...);
+  }
+  static SpyHashStateImpl combine(SpyHashStateImpl s) {
+    if (direct_absl_hash_value_error_) {
+      *s.error_ = "AbslHashValue should not be invoked directly.";
+    } else if (s.moved_from_) {
+      *s.error_ = "Used moved-from instance of the hash state object.";
+    }
+    return s;
+  }
+
+  static void SetDirectAbslHashValueError() {
+    direct_absl_hash_value_error_ = true;
+  }
+
+  // Two SpyHashStateImpl objects are equal if they hold equal hash
+  // representations.
+  friend bool operator==(const SpyHashStateImpl& lhs,
+                         const SpyHashStateImpl& rhs) {
+    return lhs.hash_representation_ == rhs.hash_representation_;
+  }
+
+  friend bool operator!=(const SpyHashStateImpl& lhs,
+                         const SpyHashStateImpl& rhs) {
+    return !(lhs == rhs);
+  }
+
+  enum class CompareResult {
+    kEqual,
+    kASuffixB,
+    kBSuffixA,
+    kUnequal,
+  };
+
+  static CompareResult Compare(const SpyHashStateImpl& a,
+                               const SpyHashStateImpl& b) {
+    const std::string a_flat = absl::StrJoin(a.hash_representation_, "");
+    const std::string b_flat = absl::StrJoin(b.hash_representation_, "");
+    if (a_flat == b_flat) return CompareResult::kEqual;
+    if (absl::EndsWith(a_flat, b_flat)) return CompareResult::kBSuffixA;
+    if (absl::EndsWith(b_flat, a_flat)) return CompareResult::kASuffixB;
+    return CompareResult::kUnequal;
+  }
+
+  // operator<< prints the hash representation as a hex and ASCII dump, to
+  // facilitate debugging.
+  friend std::ostream& operator<<(std::ostream& out,
+                                  const SpyHashStateImpl& hash_state) {
+    out << "[\n";
+    for (auto& s : hash_state.hash_representation_) {
+      size_t offset = 0;
+      for (char c : s) {
+        if (offset % 16 == 0) {
+          out << absl::StreamFormat("\n0x%04x: ", offset);
+        }
+        if (offset % 2 == 0) {
+          out << " ";
+        }
+        out << absl::StreamFormat("%02x", c);
+        ++offset;
+      }
+      out << "\n";
+    }
+    return out << "]";
+  }
+
+  // The base case of the combine recursion, which writes raw bytes into the
+  // internal buffer.
+  static SpyHashStateImpl combine_contiguous(SpyHashStateImpl hash_state,
+                                             const unsigned char* begin,
+                                             size_t size) {
+    hash_state.hash_representation_.emplace_back(
+        reinterpret_cast<const char*>(begin), size);
+    return hash_state;
+  }
+
+  using SpyHashStateImpl::HashStateBase::combine_contiguous;
+
+  absl::optional<std::string> error() const {
+    if (moved_from_) {
+      return "Returned a moved-from instance of the hash state object.";
+    }
+    return *error_;
+  }
+
+ private:
+  template <typename U>
+  friend class SpyHashStateImpl;
+
+  // This is true if SpyHashStateImpl<T> has been passed to a call of
+  // AbslHashValue with the wrong type. This detects that the user called
+  // AbslHashValue directly (because the hash state type does not match).
+  static bool direct_absl_hash_value_error_;
+
+
+  std::vector<std::string> hash_representation_;
+  // This is a shared_ptr because we want all instances of the particular
+  // SpyHashState run to share the field. This way we can set the error for
+  // use-after-move and all the copies will see it.
+  std::shared_ptr<absl::optional<std::string>> error_;
+  bool moved_from_ = false;
+};
+
+template <typename T>
+bool SpyHashStateImpl<T>::direct_absl_hash_value_error_;
+
+template <bool& B>
+struct OdrUse {
+  constexpr OdrUse() {}
+  bool& b = B;
+};
+
+template <void (*)()>
+struct RunOnStartup {
+  static bool run;
+  static constexpr OdrUse<run> kOdrUse{};
+};
+
+template <void (*f)()>
+bool RunOnStartup<f>::run = (f(), true);
+
+template <
+    typename T, typename U,
+    // Only trigger for when (T != U),
+    absl::enable_if_t<!std::is_same<T, U>::value, int> = 0,
+    // This statement works in two ways:
+    //  - First, it instantiates RunOnStartup and forces the initialization of
+    //    `run`, which set the global variable.
+    //  - Second, it triggers a SFINAE error disabling the overload to prevent
+    //    compile time errors. If we didn't disable the overload we would get
+    //    ambiguous overload errors, which we don't want.
+    int = RunOnStartup<SpyHashStateImpl<T>::SetDirectAbslHashValueError>::run>
+void AbslHashValue(SpyHashStateImpl<T>, const U&);
+
+using SpyHashState = SpyHashStateImpl<void>;
+
+}  // namespace hash_internal
+}  // namespace absl
+
+#endif  // ABSL_HASH_INTERNAL_SPY_HASH_STATE_H_