/// the buffer that will contain the result
Buffer * dest_buffer_;
/// the buffer that will contain the result
Buffer const * old_buffer_;
/// the buffer that will contain the result
Buffer const * new_buffer_;
/// the buffer that will contain the result
Buffer * dest_buffer_;
/// the buffer that will contain the result
Buffer const * old_buffer_;
/// the buffer that will contain the result
Buffer const * new_buffer_;