ame="idm45106007705952-bb"></a><span class="identifier">mean</span><span class="special">(</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><a name="idm45106007705392-bb"></a><span class="identifier">mean</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">