A benchmark program for C++ random number generators

bench-random.cpp

#include <bit>
#include <random>

#include <benchmark/benchmark.h>

template <class Generator> static void BM_random(benchmark::State &state) {
  Generator gen;
  for (auto _ : state)
    benchmark::DoNotOptimize(gen());

  const auto bits{std::bit_width(gen.max() - gen.min())};
  state.counters["bits"] = bits;
  state.counters["bits_per_second"] =
      benchmark::Counter(bits * state.iterations(), benchmark::Counter::kIsRate,
                         benchmark::Counter::kIs1024);
}
BENCHMARK(BM_random<std::minstd_rand0>);
BENCHMARK(BM_random<std::minstd_rand>);
BENCHMARK(BM_random<std::mt19937>);
BENCHMARK(BM_random<std::mt19937_64>);
BENCHMARK(BM_random<std::ranlux24_base>);
BENCHMARK(BM_random<std::ranlux48_base>);
BENCHMARK(BM_random<std::ranlux24>);
BENCHMARK(BM_random<std::ranlux48>);
BENCHMARK(BM_random<std::knuth_b>);
BENCHMARK(BM_random<std::default_random_engine>);
BENCHMARK(BM_random<std::random_device>);

BENCHMARK_MAIN();