Function operator+

3rd/asio-1.24.0/include/asio/buffer.hpp:651–662

Create a new modifiable buffer that is offset from the start of another. * @relates mutable_buffer */

 * @relates mutable_buffer
 */
inline mutable_buffer operator+(const mutable_buffer& b,
    std::size_t n) ASIO_NOEXCEPT
{
  std::size_t offset = n < b.size() ? n : b.size();
  char* new_data = static_cast<char*>(b.data()) + offset;
  std::size_t new_size = b.size() - offset;
  return mutable_buffer(new_data, new_size
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
      , b.get_debug_check()
#endif // ASIO_ENABLE_BUFFER_DEBUGGING
      );
}

/// Create a new modifiable buffer that is offset from the start of another.
/**