Method DoConsume

cpp/src/arrow/ipc/read_write_test.cc:1444–1449

struct StreamDecoderDataWriterHelper : public StreamDecoderWriterHelper {
  Status DoConsume(StreamDecoder* decoder) override {
    // This data is valid only in this function.
    ARROW_ASSIGN_OR_RAISE(auto temporary_buffer,
                          Buffer::Copy(buffer_, arrow::default_cpu_memory_manager()));
    return decoder->Consume(temporary_buffer->data(), temporary_buffer->size());
  }
};

struct StreamDecoderBufferWriterHelper : public StreamDecoderWriterHelper {