Function lazy_postinc

cpp/src/arrow/util/range_benchmark.cc:114–128

For loop with a post-increment of a lazy operator

// For loop with a post-increment of a lazy operator
void lazy_postinc(benchmark::State& state) {
  auto source = generate_junk(kSize);
  std::vector<int> target(kSize);
  auto lazy_range = internal::MakeLazyRange(
      [&source](int64_t index) { return source[index]; }, source.size());

  for (auto _ : state) {
    auto lazy_iter = lazy_range.begin();
    auto lazy_end = lazy_range.end();
    auto target_iter = target.begin();

    while (lazy_iter != lazy_end) *(target_iter++) = *(lazy_iter++);
  }
  state.SetItemsProcessed(state.iterations() * kSize);
}

BENCHMARK(lazy_postinc);