Method flush

demo_example/asio/asio/impl/buffered_write_stream.hpp:30–36

template <typename Stream>
std::size_t buffered_write_stream<Stream>::flush()
{
  std::size_t bytes_written = write(next_layer_,
      buffer(storage_.data(), storage_.size()));
  storage_.consume(bytes_written);
  return bytes_written;
}

template <typename Stream>
std::size_t buffered_write_stream<Stream>::flush(asio::error_code& ec)