Function MakeReadaheadGenerator

cpp/src/arrow/util/async_generator.h:979–982

/// This generator may queue up to max_readahead instances of T
template <typename T>
AsyncGenerator<T> MakeReadaheadGenerator(AsyncGenerator<T> source_generator,
                                         int max_readahead) {
  return ReadaheadGenerator<T>(std::move(source_generator), max_readahead);
}

/// \brief Creates a generator that will yield finished futures from a vector
///