components.primitive.flush_multi_pass.clearing_the_internal_buffer">Clearing
          the internal buffer</a>
        </h6>
<p>
          The example grammar recognizes the (simplified) preprocessor commands
          <code class="computeroutput"><span class="preprocessor">#define</span></code> and <code class="computeroutput"><span class="preprocessor">#undef</span></code> both of which are constraint
          to a single line. This makes it possible to delete all internal iterator
          buffers on e