38 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++0310 11#include <algorithm>12#include <array>13#include <cstddef>14#include <cstdint>15#include <functional>16#include <random>17 18#include "benchmark/benchmark.h"19 20constexpr std::size_t MAX_BUFFER_LEN = 256;21constexpr std::size_t MAX_SEED_LEN = 16;22 23static void BM_SeedSeq_Generate(benchmark::State& state) {24 std::array<std::uint32_t, MAX_BUFFER_LEN> buffer;25 std::array<std::uint32_t, MAX_SEED_LEN> seeds;26 {27 std::random_device rd;28 std::generate(std::begin(seeds), std::begin(seeds) + state.range(0), [&]() { return rd(); });29 }30 std::seed_seq seed(std::begin(seeds), std::begin(seeds) + state.range(0));31 for (auto _ : state) {32 seed.generate(std::begin(buffer), std::begin(buffer) + state.range(1));33 }34}35BENCHMARK(BM_SeedSeq_Generate)->Ranges({{1, MAX_SEED_LEN}, {1, MAX_BUFFER_LEN}});36 37BENCHMARK_MAIN();38