Class Callable

cpp/src/arrow/util/cache_benchmark.cc:91–106

BENCHMARK(LruCacheLookup)->Apply(SetCacheArgs);

struct Callable {
  explicit Callable(std::vector<std::string> values)
      : index_(0), values_(std::move(values)) {}

  std::string operator()(const std::string& key) {
    // Return a value unrelated to the key
    if (++index_ >= static_cast<int64_t>(values_.size())) {
      index_ = 0;
    }
    return values_[index_];
  }

 private:
  int64_t index_;
  std::vector<std::string> values_;
};

template <typename Memoized>
static void BenchmarkMemoize(benchmark::State& state, Memoized&& mem,