span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
</pre></div>
</div>
<p>Which will print the expected value.</p>
<p>Another reason why <code class="docutils literal"><span class="pre">const</span></code> is required is because of supporting <code class="docutils literal"><span class="pre">constexpr</span></code> on
C++11 compilers. In C++11, <code class="docutils literal"><span class="pre">constexpr</span></code> implies <code class="docutils liter