73 lines
2 KiB
C++
73 lines
2 KiB
C++
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// Copyright 2018 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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// http://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/container/internal/hash_generator_testing.h"
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#include <deque>
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namespace absl {
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namespace container_internal {
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namespace hash_internal {
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namespace {
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class RandomDeviceSeedSeq {
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public:
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using result_type = typename std::random_device::result_type;
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template <class Iterator>
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void generate(Iterator start, Iterator end) {
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while (start != end) {
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*start = gen_();
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++start;
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}
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}
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private:
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std::random_device gen_;
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};
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} // namespace
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std::mt19937_64* GetThreadLocalRng() {
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RandomDeviceSeedSeq seed_seq;
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thread_local auto* rng = new std::mt19937_64(seed_seq);
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return rng;
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}
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std::string Generator<std::string>::operator()() const {
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// NOLINTNEXTLINE(runtime/int)
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std::uniform_int_distribution<short> chars(0x20, 0x7E);
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std::string res;
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res.resize(32);
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std::generate(res.begin(), res.end(),
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[&]() { return chars(*GetThreadLocalRng()); });
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return res;
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}
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absl::string_view Generator<absl::string_view>::operator()() const {
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static auto* arena = new std::deque<std::string>();
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// NOLINTNEXTLINE(runtime/int)
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std::uniform_int_distribution<short> chars(0x20, 0x7E);
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arena->emplace_back();
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auto& res = arena->back();
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res.resize(32);
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std::generate(res.begin(), res.end(),
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[&]() { return chars(*GetThreadLocalRng()); });
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return res;
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}
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} // namespace hash_internal
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} // namespace container_internal
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} // namespace absl
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