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-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03
10
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(cont&: seeds), std::begin(cont&: seeds) + state.range(0), [&]() { return rd(); });
29 }
30 std::seed_seq seed(std::begin(cont&: seeds), std::begin(cont&: 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

source code of libcxx/test/benchmarks/random.bench.cpp