Function BenchmarkVisitBits

cpp/src/arrow/util/bit_util_benchmark.cc:261–282

template <typename VisitBitsFunctorType>
static void BenchmarkVisitBits(benchmark::State& state, int64_t nbytes) {
  std::shared_ptr<Buffer> buffer = CreateRandomBuffer(nbytes);

  const int64_t num_bits = nbytes * 8;
  const uint8_t* bitmap = buffer->data();

  for (auto _ : state) {
    {
      int64_t total = 0;
      const auto visit = [&total](bool value) -> void { total += value; };
      VisitBitsFunctorType()(bitmap, 0, num_bits, visit);
      benchmark::DoNotOptimize(total);
    }
    {
      int64_t total = 0;
      const auto visit = [&total](bool value) -> void { total += value; };
      VisitBitsFunctorType()(bitmap, 0, num_bits, visit);
      benchmark::DoNotOptimize(total);
    }
  }
  state.SetBytesProcessed(2LL * state.iterations() * nbytes);
}

constexpr bool pattern[] = {false, false, false, true, true, true};
static_assert(