
                  </td>
<td>
                    <p>
                      The <code class="computeroutput"><span class="identifier">columns</span></code>
                      directive invokes a generator after each N-th element of the
                      embedded generator has been emitted. The number of columns
                      is defined by the preprocessor constant <code class="computeroutput"><span class="identifier">BOOST_KARMA_DEFAULT_COLUMNS</span></code>.
                      The column 