summaryrefslogtreecommitdiff
path: root/absl/container/internal/hash_generator_testing.h
blob: 6521efe8733784459bb20d67912694634f498449 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
// 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* GetSharedRng();

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(*GetSharedRng());
  }
};

template <>
struct Generator<Enum> {
  Enum operator()() const {
    std::uniform_int_distribution<typename std::underlying_type<Enum>::type>
        dist;
    while (true) {
      auto variate = dist(*GetSharedRng());
      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(*GetSharedRng()));
      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_