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+// 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.
+//
+// Generates random values for testing. Specialized only for the few types we
+// care about.
+
+#ifndef ABSL_CONTAINER_INTERNAL_HASH_GENERATOR_TESTING_H_
+#define ABSL_CONTAINER_INTERNAL_HASH_GENERATOR_TESTING_H_
+
+#include <stdint.h>
+#include <algorithm>
+#include <iosfwd>
+#include <random>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+#include "absl/container/internal/hash_policy_testing.h"
+#include "absl/meta/type_traits.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+namespace container_internal {
+namespace hash_internal {
+namespace generator_internal {
+
+template <class Container, class = void>
+struct IsMap : std::false_type {};
+
+template <class Map>
+struct IsMap<Map, absl::void_t<typename Map::mapped_type>> : std::true_type {};
+
+} // namespace generator_internal
+
+std::mt19937_64* GetThreadLocalRng();
+
+enum Enum {
+ kEnumEmpty,
+ kEnumDeleted,
+};
+
+enum class EnumClass : uint64_t {
+ kEmpty,
+ kDeleted,
+};
+
+inline std::ostream& operator<<(std::ostream& o, const EnumClass& ec) {
+ return o << static_cast<uint64_t>(ec);
+}
+
+template <class T, class E = void>
+struct Generator;
+
+template <class T>
+struct Generator<T, typename std::enable_if<std::is_integral<T>::value>::type> {
+ T operator()() const {
+ std::uniform_int_distribution<T> dist;
+ return dist(*GetThreadLocalRng());
+ }
+};
+
+template <>
+struct Generator<Enum> {
+ Enum operator()() const {
+ std::uniform_int_distribution<typename std::underlying_type<Enum>::type>
+ dist;
+ while (true) {
+ auto variate = dist(*GetThreadLocalRng());
+ if (variate != kEnumEmpty && variate != kEnumDeleted)
+ return static_cast<Enum>(variate);
+ }
+ }
+};
+
+template <>
+struct Generator<EnumClass> {
+ EnumClass operator()() const {
+ std::uniform_int_distribution<
+ typename std::underlying_type<EnumClass>::type>
+ dist;
+ while (true) {
+ EnumClass variate = static_cast<EnumClass>(dist(*GetThreadLocalRng()));
+ if (variate != EnumClass::kEmpty && variate != EnumClass::kDeleted)
+ return static_cast<EnumClass>(variate);
+ }
+ }
+};
+
+template <>
+struct Generator<std::string> {
+ std::string operator()() const;
+};
+
+template <>
+struct Generator<absl::string_view> {
+ absl::string_view operator()() const;
+};
+
+template <>
+struct Generator<NonStandardLayout> {
+ NonStandardLayout operator()() const {
+ return NonStandardLayout(Generator<std::string>()());
+ }
+};
+
+template <class K, class V>
+struct Generator<std::pair<K, V>> {
+ std::pair<K, V> operator()() const {
+ return std::pair<K, V>(Generator<typename std::decay<K>::type>()(),
+ Generator<typename std::decay<V>::type>()());
+ }
+};
+
+template <class... Ts>
+struct Generator<std::tuple<Ts...>> {
+ std::tuple<Ts...> operator()() const {
+ return std::tuple<Ts...>(Generator<typename std::decay<Ts>::type>()()...);
+ }
+};
+
+template <class U>
+struct Generator<U, absl::void_t<decltype(std::declval<U&>().key()),
+ decltype(std::declval<U&>().value())>>
+ : Generator<std::pair<
+ typename std::decay<decltype(std::declval<U&>().key())>::type,
+ typename std::decay<decltype(std::declval<U&>().value())>::type>> {};
+
+template <class Container>
+using GeneratedType = decltype(
+ std::declval<const Generator<
+ typename std::conditional<generator_internal::IsMap<Container>::value,
+ typename Container::value_type,
+ typename Container::key_type>::type>&>()());
+
+} // namespace hash_internal
+} // namespace container_internal
+} // namespace absl
+
+#endif // ABSL_CONTAINER_INTERNAL_HASH_GENERATOR_TESTING_H_