pecial">,</span> <span class="keyword">unsigned</span> N<span class="special">,</span> <span class="keyword">typename</span><span class="special">...</span> Ns<span class="special">&gt;</span> 
        <span class="keyword">auto</span> <a class="link" href="../boost/histogram/algorithm/project_idm45105995215456.html" title="Function template project"><span class="identifier">project</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../boost/histogram/histogram.