summaryrefslogtreecommitdiff
path: root/absl/container/internal/hash_generator_testing.cc
blob: 0d6a9df16f8a336c143afaeec2069142361b889c (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
// 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/container/internal/hash_generator_testing.h"

#include <deque>

namespace absl {
namespace container_internal {
namespace hash_internal {
namespace {

class RandomDeviceSeedSeq {
 public:
  using result_type = typename std::random_device::result_type;

  template <class Iterator>
  void generate(Iterator start, Iterator end) {
    while (start != end) {
      *start = gen_();
      ++start;
    }
  }

 private:
  std::random_device gen_;
};

}  // namespace

std::mt19937_64* GetThreadLocalRng() {
  RandomDeviceSeedSeq seed_seq;
  thread_local auto* rng = new std::mt19937_64(seed_seq);
  return rng;
}

std::string Generator<std::string>::operator()() const {
  // NOLINTNEXTLINE(runtime/int)
  std::uniform_int_distribution<short> chars(0x20, 0x7E);
  std::string res;
  res.resize(32);
  std::generate(res.begin(), res.end(),
                [&]() { return chars(*GetThreadLocalRng()); });
  return res;
}

absl::string_view Generator<absl::string_view>::operator()() const {
  static auto* arena = new std::deque<std::string>();
  // NOLINTNEXTLINE(runtime/int)
  std::uniform_int_distribution<short> chars(0x20, 0x7E);
  arena->emplace_back();
  auto& res = arena->back();
  res.resize(32);
  std::generate(res.begin(), res.end(),
                [&]() { return chars(*GetThreadLocalRng()); });
  return res;
}

}  // namespace hash_internal
}  // namespace container_internal
}  // namespace absl