./../libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
                    Boolean Constant</a>).
                  </p>
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                  <p>
                    <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">traits</span><span class="special">::</span><span class="identifier">char_type_of</span><span class="spec