/Users/deen/code/yugabyte-db/src/yb/util/random_util.h
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1 | | // Licensed to the Apache Software Foundation (ASF) under one |
2 | | // or more contributor license agreements. See the NOTICE file |
3 | | // distributed with this work for additional information |
4 | | // regarding copyright ownership. The ASF licenses this file |
5 | | // to you under the Apache License, Version 2.0 (the |
6 | | // "License"); you may not use this file except in compliance |
7 | | // with the License. You may obtain a copy of the License at |
8 | | // |
9 | | // http://www.apache.org/licenses/LICENSE-2.0 |
10 | | // |
11 | | // Unless required by applicable law or agreed to in writing, |
12 | | // software distributed under the License is distributed on an |
13 | | // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
14 | | // KIND, either express or implied. See the License for the |
15 | | // specific language governing permissions and limitations |
16 | | // under the License. |
17 | | // |
18 | | // The following only applies to changes made to this file as part of YugaByte development. |
19 | | // |
20 | | // Portions Copyright (c) YugaByte, Inc. |
21 | | // |
22 | | // Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except |
23 | | // in compliance with the License. You may obtain a copy of the License at |
24 | | // |
25 | | // http://www.apache.org/licenses/LICENSE-2.0 |
26 | | // |
27 | | // Unless required by applicable law or agreed to in writing, software distributed under the License |
28 | | // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
29 | | // or implied. See the License for the specific language governing permissions and limitations |
30 | | // under the License. |
31 | | // |
32 | | |
33 | | #ifndef YB_UTIL_RANDOM_UTIL_H |
34 | | #define YB_UTIL_RANDOM_UTIL_H |
35 | | |
36 | | #include <algorithm> |
37 | | #include <random> |
38 | | |
39 | | #include <glog/logging.h> // For CHECK |
40 | | |
41 | | namespace yb { |
42 | | |
43 | | class Random; |
44 | | |
45 | | // Writes exactly n random bytes to dest using the parameter Random generator. |
46 | | // Note RandomString() does not null-terminate its strings, though '\0' could |
47 | | // be written to dest with the same probability as any other byte. |
48 | | void RandomString(void* dest, size_t n, Random* rng); |
49 | | |
50 | | // Generate a 32-bit random seed from several sources, including timestamp, |
51 | | // pid & tid. |
52 | | uint32_t GetRandomSeed32(); |
53 | | |
54 | | std::vector<uint8_t> RandomBytes(size_t len, std::mt19937_64* rng = nullptr); |
55 | | std::string RandomString(size_t len, std::mt19937_64* rng = nullptr); |
56 | | |
57 | | std::string RandomHumanReadableString(size_t len, Random* rnd); |
58 | | |
59 | | class RandomDeviceSequence { |
60 | | public: |
61 | | typedef std::random_device::result_type result_type; |
62 | | |
63 | | template<class It> |
64 | 130k | void generate(It begin, const It& end) { |
65 | 81.5M | std::generate(begin, end, [this] { return device_(); }); |
66 | 130k | } |
67 | | private: |
68 | | std::random_device device_; |
69 | | }; |
70 | | |
71 | | // Correct seeding of random number generator. |
72 | | // It is quite futile to use 32bit seed for generator with 19968bit state, like mt19937. |
73 | | template<class Engine> |
74 | 130k | void Seed(Engine* engine) { |
75 | 130k | RandomDeviceSequence sequence; |
76 | 130k | engine->seed(sequence); |
77 | 130k | } _ZN2yb4SeedINSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEEEEvPT_ Line | Count | Source | 74 | 130k | void Seed(Engine* engine) { | 75 | 130k | RandomDeviceSequence sequence; | 76 | 130k | engine->seed(sequence); | 77 | 130k | } |
_ZN2yb4SeedINSt3__123mersenne_twister_engineIjLm32ELm624ELm397ELm31ELj2567483615ELm11ELj4294967295ELm7ELj2636928640ELm15ELj4022730752ELm18ELj1812433253EEEEEvPT_ Line | Count | Source | 74 | 32 | void Seed(Engine* engine) { | 75 | 32 | RandomDeviceSequence sequence; | 76 | 32 | engine->seed(sequence); | 77 | 32 | } |
|
78 | | |
79 | | std::mt19937_64& ThreadLocalRandom(); |
80 | | |
81 | | template <class Int> |
82 | 475M | Int RandomUniformInt(Int min, Int max, std::mt19937_64* rng = nullptr) { |
83 | 475M | if (!rng) { |
84 | 471M | rng = &ThreadLocalRandom(); |
85 | 471M | } |
86 | 475M | return std::uniform_int_distribution<Int>(min, max)(*rng); |
87 | 475M | } _ZN2yb16RandomUniformIntIiEET_S1_S1_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 82 | 14.1M | Int RandomUniformInt(Int min, Int max, std::mt19937_64* rng = nullptr) { | 83 | 14.1M | if (!rng) { | 84 | 9.44M | rng = &ThreadLocalRandom(); | 85 | 9.44M | } | 86 | 14.1M | return std::uniform_int_distribution<Int>(min, max)(*rng); | 87 | 14.1M | } |
_ZN2yb16RandomUniformIntItEET_S1_S1_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 82 | 9.21M | Int RandomUniformInt(Int min, Int max, std::mt19937_64* rng = nullptr) { | 83 | 9.21M | if (!rng) { | 84 | 9.21M | rng = &ThreadLocalRandom(); | 85 | 9.21M | } | 86 | 9.21M | return std::uniform_int_distribution<Int>(min, max)(*rng); | 87 | 9.21M | } |
_ZN2yb16RandomUniformIntImEET_S1_S1_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 82 | 239M | Int RandomUniformInt(Int min, Int max, std::mt19937_64* rng = nullptr) { | 83 | 239M | if (!rng) { | 84 | 238M | rng = &ThreadLocalRandom(); | 85 | 238M | } | 86 | 239M | return std::uniform_int_distribution<Int>(min, max)(*rng); | 87 | 239M | } |
_ZN2yb16RandomUniformIntIxEET_S1_S1_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 82 | 302k | Int RandomUniformInt(Int min, Int max, std::mt19937_64* rng = nullptr) { | 83 | 302k | if (!rng) { | 84 | 2.81k | rng = &ThreadLocalRandom(); | 85 | 2.81k | } | 86 | 302k | return std::uniform_int_distribution<Int>(min, max)(*rng); | 87 | 302k | } |
_ZN2yb16RandomUniformIntIyEET_S1_S1_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 82 | 4.92M | Int RandomUniformInt(Int min, Int max, std::mt19937_64* rng = nullptr) { | 83 | 4.92M | if (!rng) { | 84 | 4.92M | rng = &ThreadLocalRandom(); | 85 | 4.92M | } | 86 | 4.92M | return std::uniform_int_distribution<Int>(min, max)(*rng); | 87 | 4.92M | } |
_ZN2yb16RandomUniformIntIjEET_S1_S1_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 82 | 351k | Int RandomUniformInt(Int min, Int max, std::mt19937_64* rng = nullptr) { | 83 | 351k | if (!rng) { | 84 | 351k | rng = &ThreadLocalRandom(); | 85 | 351k | } | 86 | 351k | return std::uniform_int_distribution<Int>(min, max)(*rng); | 87 | 351k | } |
_ZN2yb16RandomUniformIntIcEET_S1_S1_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 82 | 207M | Int RandomUniformInt(Int min, Int max, std::mt19937_64* rng = nullptr) { | 83 | 208M | if (!rng) { | 84 | 208M | rng = &ThreadLocalRandom(); | 85 | 208M | } | 86 | 207M | return std::uniform_int_distribution<Int>(min, max)(*rng); | 87 | 207M | } |
_ZN2yb16RandomUniformIntIlEET_S1_S1_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 82 | 39.7k | Int RandomUniformInt(Int min, Int max, std::mt19937_64* rng = nullptr) { | 83 | 39.7k | if (!rng) { | 84 | 39.7k | rng = &ThreadLocalRandom(); | 85 | 39.7k | } | 86 | 39.7k | return std::uniform_int_distribution<Int>(min, max)(*rng); | 87 | 39.7k | } |
_ZN2yb16RandomUniformIntIhEET_S1_S1_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 82 | 5.49k | Int RandomUniformInt(Int min, Int max, std::mt19937_64* rng = nullptr) { | 83 | 5.49k | if (!rng) { | 84 | 5.49k | rng = &ThreadLocalRandom(); | 85 | 5.49k | } | 86 | 5.49k | return std::uniform_int_distribution<Int>(min, max)(*rng); | 87 | 5.49k | } |
|
88 | | |
89 | | bool RandomUniformBool(std::mt19937_64* rng = nullptr); |
90 | | |
91 | | template <class Int> |
92 | | std::vector<Int> RandomUniformVector(Int min, Int max, uint32_t size, |
93 | 4 | std::mt19937_64* rng = nullptr) { |
94 | 4 | std::vector<Int> vec(size); |
95 | 40 | std::generate(vec.begin(), vec.end(), [=] { return RandomUniformInt(min, max, rng); }); |
96 | 4 | return vec; |
97 | 4 | } |
98 | | |
99 | | template <class Int> |
100 | 0 | bool RandomWithChance(Int chance, std::mt19937_64* rng = nullptr) { |
101 | 0 | if (!rng) { |
102 | 0 | rng = &ThreadLocalRandom(); |
103 | 0 | } |
104 | 0 | return RandomUniformInt(static_cast<Int>(0), chance - 1, rng) == 0; |
105 | 0 | } |
106 | | |
107 | | template <class Int> |
108 | 226M | Int RandomUniformInt(std::mt19937_64* rng = nullptr) { |
109 | 226M | typedef std::numeric_limits<Int> Limits; |
110 | 226M | return RandomUniformInt<Int>(Limits::min(), Limits::max(), rng); |
111 | 226M | } _ZN2yb16RandomUniformIntIyEET_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 108 | 4.80M | Int RandomUniformInt(std::mt19937_64* rng = nullptr) { | 109 | 4.80M | typedef std::numeric_limits<Int> Limits; | 110 | 4.80M | return RandomUniformInt<Int>(Limits::min(), Limits::max(), rng); | 111 | 4.80M | } |
_ZN2yb16RandomUniformIntIjEET_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 108 | 1.61k | Int RandomUniformInt(std::mt19937_64* rng = nullptr) { | 109 | 1.61k | typedef std::numeric_limits<Int> Limits; | 110 | 1.61k | return RandomUniformInt<Int>(Limits::min(), Limits::max(), rng); | 111 | 1.61k | } |
_ZN2yb16RandomUniformIntIiEET_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 108 | 2.95M | Int RandomUniformInt(std::mt19937_64* rng = nullptr) { | 109 | 2.95M | typedef std::numeric_limits<Int> Limits; | 110 | 2.95M | return RandomUniformInt<Int>(Limits::min(), Limits::max(), rng); | 111 | 2.95M | } |
_ZN2yb16RandomUniformIntItEET_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 108 | 9.20M | Int RandomUniformInt(std::mt19937_64* rng = nullptr) { | 109 | 9.20M | typedef std::numeric_limits<Int> Limits; | 110 | 9.20M | return RandomUniformInt<Int>(Limits::min(), Limits::max(), rng); | 111 | 9.20M | } |
_ZN2yb16RandomUniformIntIcEET_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 108 | 209M | Int RandomUniformInt(std::mt19937_64* rng = nullptr) { | 109 | 209M | typedef std::numeric_limits<Int> Limits; | 110 | 209M | return RandomUniformInt<Int>(Limits::min(), Limits::max(), rng); | 111 | 209M | } |
_ZN2yb16RandomUniformIntIxEET_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 108 | 14 | Int RandomUniformInt(std::mt19937_64* rng = nullptr) { | 109 | 14 | typedef std::numeric_limits<Int> Limits; | 110 | 14 | return RandomUniformInt<Int>(Limits::min(), Limits::max(), rng); | 111 | 14 | } |
|
112 | | |
113 | | template <class Real> |
114 | 6.20M | Real RandomUniformReal(Real a, Real b, std::mt19937_64* rng = nullptr) { |
115 | 6.20M | if (!rng) { |
116 | 6.20M | rng = &ThreadLocalRandom(); |
117 | 6.20M | } |
118 | 6.20M | return std::uniform_real_distribution<Real>(a, b)(*rng); |
119 | 6.20M | } _ZN2yb17RandomUniformRealIdEET_S1_S1_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 114 | 6.20M | Real RandomUniformReal(Real a, Real b, std::mt19937_64* rng = nullptr) { | 115 | 6.20M | if (!rng) { | 116 | 6.20M | rng = &ThreadLocalRandom(); | 117 | 6.20M | } | 118 | 6.20M | return std::uniform_real_distribution<Real>(a, b)(*rng); | 119 | 6.20M | } |
_ZN2yb17RandomUniformRealIfEET_S1_S1_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 114 | 1 | Real RandomUniformReal(Real a, Real b, std::mt19937_64* rng = nullptr) { | 115 | 1 | if (!rng) { | 116 | 1 | rng = &ThreadLocalRandom(); | 117 | 1 | } | 118 | 1 | return std::uniform_real_distribution<Real>(a, b)(*rng); | 119 | 1 | } |
|
120 | | |
121 | | template <class Real> |
122 | 1.35M | Real RandomUniformReal(std::mt19937_64* rng = nullptr) { |
123 | 1.35M | return RandomUniformReal(static_cast<Real>(0), static_cast<Real>(1), rng); |
124 | 1.35M | } _ZN2yb17RandomUniformRealIdEET_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 122 | 1.35M | Real RandomUniformReal(std::mt19937_64* rng = nullptr) { | 123 | 1.35M | return RandomUniformReal(static_cast<Real>(0), static_cast<Real>(1), rng); | 124 | 1.35M | } |
_ZN2yb17RandomUniformRealIfEET_PNSt3__123mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 122 | 1 | Real RandomUniformReal(std::mt19937_64* rng = nullptr) { | 123 | 1 | return RandomUniformReal(static_cast<Real>(0), static_cast<Real>(1), rng); | 124 | 1 | } |
|
125 | | |
126 | 18.5M | inline bool RandomActWithProbability(double probability, std::mt19937_64* rng = nullptr) { |
127 | 17.3M | return probability <= 0 ? false |
128 | 1.15M | : probability >= 1.0 ? true |
129 | 1.15M | : RandomUniformReal<double>(rng) < probability; |
130 | 18.5M | } |
131 | | |
132 | | template <class Collection> |
133 | | typename Collection::const_reference RandomElement(const Collection& collection, |
134 | 235M | std::mt19937_64* rng = nullptr) { |
135 | 235M | CHECK(!collection.empty()); |
136 | 235M | size_t index = RandomUniformInt<size_t>(0, collection.size() - 1, rng); |
137 | 235M | auto it = collection.begin(); |
138 | 235M | std::advance(it, index); |
139 | 235M | return *it; |
140 | 235M | } _ZN2yb13RandomElementINSt3__16vectorINS1_10unique_ptrINS_25BatchTimeseriesDataSourceENS1_14default_deleteIS4_EEEENS1_9allocatorIS7_EEEEEENT_15const_referenceERKSB_PNS1_23mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 134 | 937k | std::mt19937_64* rng = nullptr) { | 135 | 937k | CHECK(!collection.empty()); | 136 | 937k | size_t index = RandomUniformInt<size_t>(0, collection.size() - 1, rng); | 137 | 937k | auto it = collection.begin(); | 138 | 937k | std::advance(it, index); | 139 | 937k | return *it; | 140 | 937k | } |
Unexecuted instantiation: _ZN2yb13RandomElementINSt3__16vectorINS1_10shared_ptrINS_7tserver16MiniTabletServerEEENS1_9allocatorIS6_EEEEEENT_15const_referenceERKSA_PNS1_23mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE _ZN2yb13RandomElementINSt3__112basic_stringIcNS1_11char_traitsIcEENS1_9allocatorIcEEEEEENT_15const_referenceERKS8_PNS1_23mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 134 | 234M | std::mt19937_64* rng = nullptr) { | 135 | 234M | CHECK(!collection.empty()); | 136 | 234M | size_t index = RandomUniformInt<size_t>(0, collection.size() - 1, rng); | 137 | 234M | auto it = collection.begin(); | 138 | 234M | std::advance(it, index); | 139 | 234M | return *it; | 140 | 234M | } |
Unexecuted instantiation: _ZN2yb13RandomElementINSt3__16vectorINS1_10shared_ptrINS_6tablet10TabletPeerEEENS1_9allocatorIS6_EEEEEENT_15const_referenceERKSA_PNS1_23mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE _ZN2yb13RandomElementINSt3__16vectorINS1_12basic_stringIcNS1_11char_traitsIcEENS1_9allocatorIcEEEENS6_IS8_EEEEEENT_15const_referenceERKSB_PNS1_23mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 134 | 61.3k | std::mt19937_64* rng = nullptr) { | 135 | 61.3k | CHECK(!collection.empty()); | 136 | 61.3k | size_t index = RandomUniformInt<size_t>(0, collection.size() - 1, rng); | 137 | 61.3k | auto it = collection.begin(); | 138 | 61.3k | std::advance(it, index); | 139 | 61.3k | return *it; | 140 | 61.3k | } |
_ZN2yb13RandomElementINSt3__16vectorIPKNS1_12basic_stringIcNS1_11char_traitsIcEENS1_9allocatorIcEEEENS6_ISA_EEEEEENT_15const_referenceERKSD_PNS1_23mersenne_twister_engineIyLm64ELm312ELm156ELm31ELy13043109905998158313ELm29ELy6148914691236517205ELm17ELy8202884508482404352ELm37ELy18444473444759240704ELm43ELy6364136223846793005EEE Line | Count | Source | 134 | 221k | std::mt19937_64* rng = nullptr) { | 135 | 221k | CHECK(!collection.empty()); | 136 | 221k | size_t index = RandomUniformInt<size_t>(0, collection.size() - 1, rng); | 137 | 221k | auto it = collection.begin(); | 138 | 221k | std::advance(it, index); | 139 | 221k | return *it; | 140 | 221k | } |
|
141 | | |
142 | | std::string RandomHumanReadableString(size_t len, std::mt19937_64* rng = nullptr); |
143 | | |
144 | | } // namespace yb |
145 | | |
146 | | #endif // YB_UTIL_RANDOM_UTIL_H |