Abseil Common Libraries (C++) (grcp 依赖)
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127 lines
3.5 KiB
127 lines
3.5 KiB
// Copyright 2017 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// https://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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#include "absl/random/seed_sequences.h" |
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#include <iterator> |
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#include <random> |
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#include "gmock/gmock.h" |
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#include "gtest/gtest.h" |
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#include "absl/random/internal/nonsecure_base.h" |
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#include "absl/random/random.h" |
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namespace { |
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TEST(SeedSequences, Examples) { |
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{ |
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absl::SeedSeq seed_seq({1, 2, 3}); |
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absl::BitGen bitgen(seed_seq); |
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EXPECT_NE(0, bitgen()); |
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} |
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{ |
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absl::BitGen engine; |
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auto seed_seq = absl::CreateSeedSeqFrom(&engine); |
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absl::BitGen bitgen(seed_seq); |
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EXPECT_NE(engine(), bitgen()); |
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} |
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{ |
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auto seed_seq = absl::MakeSeedSeq(); |
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std::mt19937 random(seed_seq); |
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EXPECT_NE(0, random()); |
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} |
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} |
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TEST(CreateSeedSeqFrom, CompatibleWithStdTypes) { |
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using ExampleNonsecureURBG = |
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absl::random_internal::NonsecureURBGBase<std::minstd_rand0>; |
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// Construct a URBG instance. |
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ExampleNonsecureURBG rng; |
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// Construct a Seed Sequence from its variates. |
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auto seq_from_rng = absl::CreateSeedSeqFrom(&rng); |
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// Ensure that another URBG can be validly constructed from the Seed Sequence. |
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std::mt19937_64{seq_from_rng}; |
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} |
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TEST(CreateSeedSeqFrom, CompatibleWithBitGenerator) { |
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// Construct a URBG instance. |
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absl::BitGen rng; |
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// Construct a Seed Sequence from its variates. |
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auto seq_from_rng = absl::CreateSeedSeqFrom(&rng); |
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// Ensure that another URBG can be validly constructed from the Seed Sequence. |
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std::mt19937_64{seq_from_rng}; |
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} |
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TEST(CreateSeedSeqFrom, CompatibleWithInsecureBitGen) { |
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// Construct a URBG instance. |
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absl::InsecureBitGen rng; |
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// Construct a Seed Sequence from its variates. |
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auto seq_from_rng = absl::CreateSeedSeqFrom(&rng); |
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// Ensure that another URBG can be validly constructed from the Seed Sequence. |
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std::mt19937_64{seq_from_rng}; |
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} |
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TEST(CreateSeedSeqFrom, CompatibleWithRawURBG) { |
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// Construct a URBG instance. |
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std::random_device urandom; |
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// Construct a Seed Sequence from its variates, using 64b of seed-material. |
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auto seq_from_rng = absl::CreateSeedSeqFrom(&urandom); |
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// Ensure that another URBG can be validly constructed from the Seed Sequence. |
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std::mt19937_64{seq_from_rng}; |
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} |
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template <typename URBG> |
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void TestReproducibleVariateSequencesForNonsecureURBG() { |
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const size_t kNumVariates = 1000; |
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// Master RNG instance. |
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URBG rng; |
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// Reused for both RNG instances. |
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auto reusable_seed = absl::CreateSeedSeqFrom(&rng); |
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typename URBG::result_type variates[kNumVariates]; |
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{ |
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URBG child(reusable_seed); |
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for (auto& variate : variates) { |
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variate = child(); |
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} |
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} |
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// Ensure that variate-sequence can be "replayed" by identical RNG. |
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{ |
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URBG child(reusable_seed); |
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for (auto& variate : variates) { |
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ASSERT_EQ(variate, child()); |
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} |
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} |
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} |
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TEST(CreateSeedSeqFrom, ReproducesVariateSequencesForInsecureBitGen) { |
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TestReproducibleVariateSequencesForNonsecureURBG<absl::InsecureBitGen>(); |
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} |
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TEST(CreateSeedSeqFrom, ReproducesVariateSequencesForBitGenerator) { |
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TestReproducibleVariateSequencesForNonsecureURBG<absl::BitGen>(); |
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} |
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} // namespace
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