Function MakeFlatMappedGenerator

cpp/src/arrow/util/async_generator.h:291–294

          typename Mapped = detail::result_of_t<MapFn(const T&)>,
          typename V = typename EnsureFuture<Mapped>::type::ValueType>
AsyncGenerator<T> MakeFlatMappedGenerator(AsyncGenerator<T> source_generator, MapFn map) {
  return MakeConcatenatedGenerator(
      MakeMappedGenerator(std::move(source_generator), std::move(map)));
}

/// \see MakeSequencingGenerator
template <typename T, typename ComesAfter, typename IsNext>