Function consume

3rd/asio-1.24.0/include/asio/buffer.hpp:1968–1980

@b DynamicBuffer_v1: Remove characters from the input sequence. @b DynamicBuffer_v2: Consume the specified number of bytes from the beginning of the underlying memory. * @b DynamicBuffer_v1: Removes @c n characters from the beginning of the * input sequence. @note If @c n is greater than the size of the input * sequence, the entire input sequence is consumed and no error is issued. * *

   * emptied.
   */
  void consume(std::size_t n)
  {
#if !defined(ASIO_NO_DYNAMIC_BUFFER_V1)
    if (size_ != (std::numeric_limits<std::size_t>::max)())
    {
      std::size_t consume_length = (std::min)(n, size_);
      string_.erase(0, consume_length);
      size_ -= consume_length;
      return;
    }
#endif // !defined(ASIO_NO_DYNAMIC_BUFFER_V1)
    string_.erase(0, n);
  }

private:
  std::basic_string<Elem, Traits, Allocator>& string_;