erent namespaces.
            You have to make sure not to mix placeholders with a library they don't
            belong to and not to use different libraries while writing a semantic
            action.
          </p>
<p>
            Generally, for <a href="../../../../../../../libs/bind/index.html" target="_top">Boost.Bind</a>,
            use <code class="computeroutput"><span class="special">::</span><span class="identifier">_1</span></code>,
            <code class="computeroutput"><span class="special