Method prepare

include/asio/basic_streambuf.hpp:214–219

Get a list of buffers that represents the output sequence, with the given size. * Ensures that the output sequence can accommodate @c n characters, * reallocating character array objects as necessary. * * @returns An object of type @c mutable_buffers_type that satisfies * MutableBufferSequence requirements, representing character array objects * at the start of the output sequence s

   * function that modifies the input sequence or output sequence.
   */
  mutable_buffers_type prepare(std::size_t n)
  {
    reserve(n);
    return asio::buffer(asio::mutable_buffer(
          pptr(), n * sizeof(char_type)));
  }

  /// Move characters from the output sequence to the input sequence.
  /**