<p>
            There are different ways to write semantic actions for <span class="emphasis"><em>Spirit.Qi</em></span>:
            using plain functions, <a href="../../../../../../../libs/bind/index.html" target="_top">Boost.Bind</a>,
            <a href="../../../../../../../libs/lambda/index.html" target="_top">Boost.Lambda</a>, or
            <a href="../../../../../../../libs/phoenix/doc/html/index.html" target="_top">Boost.Phoenix</a>.
            The latter three allow you to use special placeholde